CN109781550B - Vertical loading test device and method for shear connector - Google Patents
Vertical loading test device and method for shear connector Download PDFInfo
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- CN109781550B CN109781550B CN201910224841.3A CN201910224841A CN109781550B CN 109781550 B CN109781550 B CN 109781550B CN 201910224841 A CN201910224841 A CN 201910224841A CN 109781550 B CN109781550 B CN 109781550B
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Abstract
The invention relates to a shear connector vertical loading test device and a shear connector vertical loading test method. The test piece fixing device comprises a test bed seat, a first fixing base, a second fixing base, a test piece fixing system, a test piece limiting system, and a loading plate of the test piece limiting system, wherein the loading plate and a test piece are closely arranged in parallel; the two ends of the loading plate are respectively provided with a deformation measurement system, the deformation measurement system comprises displacement sensors, vertical inductance measuring heads of the displacement sensors are respectively arranged at the two ends of the bottom of the loading plate, horizontal inductance measuring heads of the displacement sensors are matched with a horizontal displacement measurement auxiliary device, the horizontal displacement measurement auxiliary device is arranged at four corners of the loading plate, and the vertical inductance measuring heads and the horizontal inductance measuring heads are fixedly connected with a bracket base through vertical brackets respectively; the upper part of the loading plate is fixedly connected with the lower end of an MTS actuator of the vertical loading system, the upper end of the MTS actuator is fixedly connected with the upper part of the portal, and the two ends of the bottom of the portal are fixedly connected with the experimental bench. The invention has simple structure and easy installation; the data inspection measurement is accurate, and the precision is high.
Description
Technical Field
The invention relates to a building member test device, in particular to a shear connector vertical loading test device and a shear connector vertical loading test method.
Background
In the building construction process, the connection structure of the concrete externally-hung wallboard is an important factor for ensuring the strength and rigidity of the building structure and the space integrity. The connection modes of the external concrete wall panels and the main body structure at home and abroad are various, and a unified test device for detecting the shearing resistance of the shear connector is not available at present. Meanwhile, the shear connection piece shear bearing capacity test has higher requirements on a test device, so that a set of mature and reliable test device is needed to accurately measure the shear connection piece shear bearing capacity so as to accurately evaluate the safety performance of a building structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a shear connector vertical loading test device and a test method with accurate measurement data.
The technical scheme adopted for solving the technical problems is as follows:
the vertical loading test device for the shear connector comprises an experiment pedestal, wherein a first fixing base and a second fixing base are symmetrically arranged on the experiment pedestal, a test piece fixing system is arranged on the first fixing base, a test piece limiting system is arranged on the second fixing base, and a loading plate of the test piece limiting system is closely arranged in parallel with a test piece; the two ends of the loading plate are respectively provided with a deformation measuring system, the position deformation measuring system comprises displacement sensors, vertical inductance measuring heads of the displacement sensors are respectively arranged at the two ends of the bottom of the loading plate, horizontal inductance measuring heads of the displacement sensors are matched with a horizontal displacement measuring auxiliary device, the horizontal displacement measuring auxiliary device is arranged at four corners of the loading plate, and the vertical inductance measuring heads and the horizontal inductance measuring heads are fixedly connected with a bracket base through vertical brackets respectively; the upper part of the loading plate is fixedly connected with the lower end of an MTS actuator of the vertical loading system, the upper end of the MTS actuator is fixedly connected with the upper part of the portal, and the two ends of the bottom of the portal are fixedly connected with the experimental bench.
Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:
the whole structure is simple, and the installation is easy; the data inspection measurement is accurate, and the precision is high; the test piece limiting system can ensure that the loading plate is always in a vertical plane in the loading process, and is in a pure shearing state; meanwhile, the relative displacement between the loading plate and the fixing plate is obtained, and the deformability of the test piece can be comprehensively measured.
Further, the optimization scheme of the invention is as follows:
the first unable adjustment base is welding component, first unable adjustment base includes the bottom plate, first channel-section steel, the second channel-section steel, roof and channel-section steel connecting plate, first channel-section steel and the vertical setting of second channel-section steel, the notch of first channel-section steel and second channel-section steel is relative, the lower extreme and the bottom plate rigid coupling of first channel-section steel and second channel-section steel, the upper end and the roof rigid coupling of first channel-section steel and second channel-section steel, the roof is equipped with long connecting hole, through the channel-section steel connecting plate rigid coupling between the middle part of first channel-section steel and second channel-section steel, second unable adjustment base is the same with first unable adjustment base structure.
One end of the fixed beam penetrates through a gap between the first channel steel and the second channel steel of the first fixed base, the other end of the fixed beam penetrates through a gap between the first channel steel and the second channel steel of the second fixed base, transverse fixed pressing beams are respectively arranged on the upper parts of the two ends of the fixed beam, the fixed pressing beams are welding members, each fixed pressing beam comprises a third channel steel and a fourth channel steel, the notches of the third channel steel and the fourth channel steel are oppositely arranged, and the third channel steel and the fourth channel steel are connected through steel plates; the experimental bench is provided with a plurality of T-shaped grooves, two ends of the fixed pressing beam are fixedly connected with the experimental bench through anchoring screws, nuts of the anchoring screws are arranged in the T-shaped grooves, and the fixed beam is I-steel or H-steel.
The test piece fixing system comprises a first support frame, a second support frame, a first transverse plate, a second transverse plate, a first connecting plate, a second connecting plate and a first connecting rod, wherein the first support frame and the second support frame are triangular welding members, the first support frame and the second support frame are arranged on two sides of the upper part of the first fixing base in parallel, the first transverse plate is arranged on the lower part of the inner side of the vertical parts of the first support frame and the second support frame, and the second transverse plate is arranged on the upper part of the inner side of the vertical parts of the first support frame and the second support frame; the two ends of the first transverse plate and the second transverse plate are respectively provided with a first connecting plate and a second connecting plate which are vertical, the first connecting plate and the second connecting plate are respectively arranged on two sides of the first transverse plate and two sides of the second transverse plate, the upper end and the lower end of the first connecting plate and the lower end of the second connecting plate are respectively connected through a first connecting rod, and the first connecting plate and the second connecting plate are used for fixing a test piece.
The test piece limiting system is identical to the test piece fixing system in structure, and comprises a third supporting frame, a fourth supporting frame, a third transverse plate, a fourth transverse plate, a third connecting plate, a fourth connecting plate and a second connecting rod, wherein the third connecting plate and the fourth connecting plate are respectively arranged on the inner sides of the third transverse plate and the fourth transverse plate, the upper end and the lower end of the third connecting plate and the lower end of the fourth connecting plate are connected through the second connecting rod, and a frame loading plate is arranged between the third connecting plate and the fourth connecting plate.
And vertical roller mechanisms are respectively arranged between the first connecting plate and the loading plate and between the second connecting plate and the loading plate, each roller mechanism comprises a first limiting plate, a second limiting plate and a roller, a plurality of shaft holes are symmetrically formed in the first limiting plate and the second limiting plate, and two ends of each roller are arranged in the shaft holes.
The horizontal displacement measurement auxiliary device is a steel plate welding member, the inner end of the horizontal displacement measurement auxiliary device is U-shaped, the inner end of the horizontal displacement measurement auxiliary device is fixedly connected with the loading plate through a bolt, and the outer end of the horizontal displacement measurement auxiliary device is parallel to the loading plate and extends out of the end face of the loading plate.
The vertical loading system comprises an MTS actuator and an actuator loading head, the actuator loading head comprises a I-steel and a loading head connecting plate, the upper parts of the actuator loading head and the I-steel are fixedly connected, a plurality of connecting holes are uniformly distributed on the lower part of the I-steel and two sides of a loading plate, the I-steel is fixedly connected with the loading plate through bolts, and the loading head connecting plate is connected with the lower end of the MTS actuator through bolts.
The displacement sensor is an LVDT linear displacement sensor.
A test method of a shear connector shear bearing capacity vertical loading test device comprises the following steps:
A. the first fixed base and the second fixed base are installed and fixed, and the distance between the first fixed base and the second fixed base is determined and fixed according to the length of the shear connector;
B. installing an MTS actuator and an actuator loading head, wherein the MTS actuator coincides with the center of the actuator loading head;
C. hoisting a test piece, installing and adjusting the position of a loading plate, enabling the center of the loading plate to coincide with the center of a loading head of an actuator and the center of an MTS actuator, and connecting the loading plate with the loading head of the actuator through bolts;
D. installing a test piece fixing system, welding a first transverse plate and a second transverse plate on the inner surfaces of the vertical parts of the first support frame and the second support frame, determining the positions of the first support frame and the second support frame on the upper surface of the first fixing base according to the length of the shear connecting piece, fastening by bolts, and finally fixing the test piece on the first fixing base through the first connecting plate, the second connecting plate and the first connecting rod;
E. installing a test piece limiting system, namely, firstly correctly adjusting the positions of a third support frame and a fourth support frame and using bolts on a second fixed base, welding a third transverse plate and a fourth transverse plate on the inner surfaces of the vertical parts of the third support frame and the fourth support frame, and simultaneously installing a third connecting plate, a fourth connecting plate, a second connecting rod and a roller mechanism to enable the roller mechanism to be fixed at the upper center and the lower center of a loading plate;
F. and (3) carrying out tiny correction according to the actual mounting position of the test piece device, and finally fixing the first fixing base and the second fixing base on the experiment table seat through the fixing beam and the fixing pressing beam.
G. The method comprises the steps of installing a deformation measuring system, installing vertical supports on two sides of a loading plate, fixing the vertical supports on an experiment table seat, fixing a vertical inductance measuring head of a displacement sensor on the vertical supports, and measuring vertical displacement of two ends of the loading plate; the displacement measurement auxiliary device is fixed at four corners of the loading plate through bolts, the horizontal inductance measuring head of the displacement sensor is fixed on the vertical support, and relative displacement between the loading plate and the test piece is measured.
H. And (3) carrying out test loading, lifting or dropping the MTS actuator according to test requirements, and observing the change state of the test piece.
Drawings
FIG. 1 is a schematic overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a partially enlarged structure of FIG. 1;
FIG. 3 is a schematic view of a specimen fixation system;
FIG. 4 is a schematic diagram of a test piece limiting system;
FIG. 5 is a schematic diagram of a deformation measurement system;
FIG. 6 is a schematic diagram of a vertical loading system configuration;
FIG. 7 is a schematic structural view of a mast cross beam;
FIG. 8 is a schematic view of a roller mechanism;
in the figure: a laboratory bench 1; a concrete counterforce wall 1-1; t-shaped grooves 1-2; a portal 2; a portal beam 2-1; a vertical frame 2-2; a lower actuator connecting plate 2-3; an upper actuator connecting plate 2-4; MTS actuators 3; fixing the pressing beam 4; a third channel steel 4-1; a fourth channel steel 4-2; an anchor screw 5; a fixed beam 6; a first fixed base 7; a bottom plate 7-1; a first channel steel 7-2; 7-3 parts of second channel steel; 7-4 of channel steel connecting plates; a top plate 7-5; a first support frame 8; a support frame bolt hole 9; a first cross plate 10; a second cross plate 11; test piece 12; a first connection plate 13; a first link 14; an actuator loading head 15; a roller mechanism 16; a bracket base 17; a displacement sensor 18; a vertical inductance probe 18-1; a horizontal inductance probe 18-2; a horizontal displacement measurement assisting device 19; the actuator loading head is provided with I-steel bolt holes 20; an actuator loading head steel plate 21; the actuator loading head I-steel 22; a vertical support 23; a second connection plate 24; a roller 25; a first limiting plate 26; a loading plate 27; a second support 28; a second fixed base 29; a third support frame 30; a fourth supporting frame 31; a third cross plate 32; a fourth cross plate 33; a third connecting plate 34; a fourth connecting plate 35; a second link 36; and a second limiting plate 37.
Detailed Description
The invention is described in detail below with reference to the drawings and examples.
Referring to fig. 1 and 2, a shear connector vertical loading test device comprises an experiment table 1, a concrete reaction wall 1-1, a portal 2, an MTS actuator 3 and a fixed pressure beam 4; an anchor screw 5; a fixed beam 6; the device comprises a first fixed base 7, a second fixed base 29, a test piece fixing system, a test piece limiting system, a vertical loading system and a deformation measuring system. One end of the experiment table 1 is provided with a concrete reaction wall 1-1, and the experiment table 1 is provided with a plurality of T-shaped grooves 1-2. The first fixed base 7 and the second fixed base 29 are symmetrically arranged on the experiment table seat 1, and the first fixed base 7 and the second fixed base 29 are symmetrically arranged.
The first fixing base 7 is a welding component, the first fixing base 7 is composed of a bottom plate 7-1, a first channel steel 7-2, a second channel steel 7-3, a channel steel connecting plate 7-4 and a top plate 7-5, the first channel steel 7-2 and the second channel steel 7-3 are vertically arranged, the notch of the first channel steel 7-2 and the notch of the second channel steel 7-3 are opposite, the lower ends of the first channel steel 7-2 and the second channel steel 7-3 are welded with a rectangular bottom plate, the upper ends of the first channel steel 7-2 and the second channel steel 7-3 are welded with a rectangular top plate 7-5, a plurality of long connecting holes are machined on two sides of the top plate 7-5, the middle parts of the first channel steel 7-2 and the second channel steel 7-3 are welded through the channel steel connecting plate 7-4, a gap is reserved between the first channel steel 7-2 and the second channel steel 7-3, and the second fixing base 29 is identical to the first fixing base 7.
The first fixing base 7 and the second fixing base 29 are fixedly connected with the experiment table base 1 through the fixing beam 6, one end of the fixing beam 6 penetrates through a gap between the first channel steel 7-2 and the second channel steel 7-3 of the first fixing base 7, the other end of the fixing beam 6 penetrates through a gap between the first channel steel 7-2 and the second channel steel 7-3 of the second fixing base 29, and the upper parts of the two ends of the fixing beam 6 are respectively provided with a transverse fixing pressing beam 4. The fixed pressing beam 4 is a welding component, the fixed pressing beam 4 is composed of a third channel steel 4-1, a fourth channel steel 4-2 and a connecting steel plate, the notches of the third channel steel 4-1 and the fourth channel steel 4-2 are arranged in a back-to-back mode, the third channel steel 4-1 and the fourth channel steel 4-2 are welded through the connecting steel plate, and a gap is reserved between the third channel steel 4-1 and the fourth channel steel 4-2. The two ends of the fixed pressing beam 4 are fixedly connected with the experimental pedestal 1 through an anchoring screw 5, a nut of the anchoring screw 5 is arranged in a T-shaped groove, and the fixed beam 6 is I-steel or H-steel.
The first fixing base 7 is provided with a test piece fixing system (shown in fig. 2 and 3), and the test piece fixing system is composed of a first supporting frame 8, a second supporting frame 28, a first transverse plate 10, a second transverse plate 11, a first connecting plate 13, a second connecting plate 24 and a first connecting rod 14. The first support 8 and the second support 28 are triangular welding members, and are composed of a horizontal steel plate, a vertical steel plate and triangular rib plates, and support bolt holes 9 are formed in the horizontal steel plate. The first support frame 8 and the second support frame 28 are installed in parallel on two sides of the upper portion of the first fixed base 7, the first support frame 8 and the second support frame 28 are connected with the first fixed base 7 through bolts, and the first support frame 8 and the second support frame 28 can slide back and forth along long connecting holes of the first fixed base 7 of the fixed base according to shear connectors with different lengths. The first transverse plate 10 is arranged at the lower part of the inner side of the vertical parts of the first support frame 8 and the second support frame 28, the second transverse plate 11 is arranged at the upper part of the inner side of the vertical parts of the first support frame 8 and the second support frame 28, the first transverse plate 10 and the second transverse plate 11 are respectively welded with the first support frame 8 and the second support frame 28, and the first transverse plate 10 and the second transverse plate 11 are parallel. The two ends of the first transverse plate 10 and the second transverse plate 11 are respectively provided with a first connecting plate 13 and a second connecting plate 24 which are vertical, the first connecting plate 13 and the second connecting plate 24 are respectively arranged on two sides of the first transverse plate 8 and the second transverse plate 28, the upper end and the lower end of the first connecting plate 13 and the lower end of the second connecting plate 24 are respectively connected through a first connecting rod 14, the first connecting plate 13 and the second connecting plate 24 are used for installing and fixing a test piece 12, and the test piece 12 is installed between the first connecting plate 13 and the second connecting plate 24.
The second fixing base 29 is provided with a test piece limiting system (shown in fig. 2 and 4), the test piece limiting system has the same structure as the test piece fixing system, the test piece limiting system is composed of a third supporting frame 30, a fourth supporting frame 31, a third transverse plate 32, a fourth transverse plate 33, a third connecting plate 34, a fourth connecting plate 36 and a second connecting rod 35, the third connecting plate 34 and the fourth connecting plate 36 are respectively arranged on the inner sides of the third transverse plate 32 and the fourth transverse plate 33, and the upper end and the lower end of the third connecting plate 34 and the lower end of the fourth connecting plate 36 are connected through the second connecting rod 35. The load plate 27 is mounted between the third 34 and fourth 36 webs. Vertical roller mechanisms (shown in fig. 8) are respectively arranged between the first connecting plate 34 and the loading plate 27, between the second connecting plate 36 and the loading plate 27, each roller mechanism consists of a first limiting plate 26, a second limiting plate 37 and a roller 25, 10 shaft holes are symmetrically machined in the first limiting plate 26 and the second limiting plate 37, and two ends of the roller 25 are arranged in the shaft holes. Load plate 27 is positioned immediately adjacent to test piece 12.
The two ends of the loading plate 27 are respectively provided with a deformation measuring system (shown in fig. 2 and 5), the deformation measuring system is composed of a displacement sensor 18, a vertical bracket 23, a horizontal displacement measuring auxiliary device 19 and a bracket base 17, and the displacement sensor 18 is an LVDT linear displacement sensor. The vertical inductance measuring heads 18-1 of the displacement sensor 18 are respectively arranged at two ends of the bottom of the loading plate 27, the four horizontal inductance measuring heads 18-2 of the displacement sensor 18 are respectively matched with the outer ends of the horizontal displacement measurement auxiliary devices 19, the horizontal displacement measurement auxiliary devices 19 are arranged at four corners of the loading plate 27, the horizontal displacement measurement auxiliary devices 19 are steel plate welding members, the inner ends of the horizontal displacement measurement auxiliary devices 19 are U-shaped, the inner ends of the horizontal displacement measurement auxiliary devices 19 are connected with the loading plate 27 through bolts, and the outer ends of the horizontal displacement measurement auxiliary devices 19 are parallel to the loading plate 27 and extend out of the end faces of the loading plate 27. The vertical electric sensing head 8-1 and the horizontal electric sensing head 18-2 are fixedly connected with the bracket base 17 through a vertical bracket 23 respectively, and the vertical bracket 23 is made of angle steel.
The upper portion of the load plate 27 is connected to a vertical load system (shown in fig. 6 and 7) consisting of an MTS actuator 3, an actuator load head 15 and a mast 2. The actuator loading head 15 is composed of I-steel 23 and a loading head connecting plate 21, the loading head connecting plate 21 is provided with an actuator loading head I-steel bolt hole 20, the upper part of the I-steel 23 is connected with the loading head connecting plate 21 through bolts, and the loading head connecting plate 21 is connected with the lower end of the MTS actuator 3 through high-strength bolts. A plurality of connecting holes are uniformly distributed on two sides of the lower part of the I-steel 23, and the lower part of the I-steel 23 is connected with the loading plate 27 through bolts. The upper end of MTS actuator 3 is connected with lower actuator connecting plate 2-3 through the bolt, and lower actuator connecting plate 2-3 is connected with upper actuator connecting plate 2-4 through the bolt, and lower actuator connecting plate 2-3 is arranged in the lower part of portal crossbeam 2-1, and upper actuator connecting plate 2-4 is arranged in the upper portion of portal crossbeam 2-1. The two ends of the portal beam 2-1 are respectively welded with the upper ends of the vertical frames 2-2, and the lower ends of the vertical frames 2-2 are connected with the experiment table seat 1 through bolts.
The test method of the shear connector shear bearing capacity vertical loading test device is carried out according to the following steps:
A. the first fixing base 7 and the second fixing base 29 are installed and fixed, and the distance between the first fixing base 7 and the second fixing base 29 is determined and fixed according to the length of the shear connector;
B. the MTS actuator 3 and the actuator loading head 15 are installed, the MTS actuator 3 coincides with the center of the actuator loading head 15, the upper end of the MTS actuator 3 is installed below the inside of the portal 2, and the actuator loading head 15 is installed at the lower end of the MTS actuator 3;
C. hoisting the test piece 12, installing and adjusting the position of the loading plate 27, enabling the center of the loading plate 27 to coincide with the center of the actuator loading head 15 and the center of the MTS actuator 3, and connecting the loading plate 27 with the actuator loading head 15 through bolts;
D. installing a test piece fixing system, welding a first transverse plate 10 and a second transverse plate 11 on the inner surfaces of the vertical parts of a first support frame 8 and a second support frame 28, determining the positions of the first support frame 8 and the second support frame 28 on the upper surface of a first fixing base 7 according to the lengths of shear connectors, fastening by bolts, and finally fixing a test piece 12 on the second fixing base 7 through a first connecting plate 13, a second connecting plate 24 and a first connecting rod 14;
E. the test piece limiting system is installed, the positions of the third supporting frame 30 and the fourth supporting frame 31 are accurately adjusted and are bolted on the second fixed base 29, the third transverse plate 32 and the fourth transverse plate 33 are welded on the inner surfaces of the vertical parts of the third supporting frame 30 and the fourth supporting frame 31, and meanwhile, the third connecting plate 34, the fourth connecting plate 36, the second connecting rod 35 and the roller mechanism are installed, so that the roller mechanism is fixed at the upper center and the lower center of the loading plate 27;
F. performing tiny correction according to the actual installation position of the test piece device, and finally fixing the first fixing base 7 and the second fixing base 29 on the experiment table seat 1 through the fixing beam 6 and the fixing pressing beam 4;
G. mounting a deformation measuring mechanism, mounting vertical brackets 23 on two sides of a loading plate 27, fixing the vertical brackets on the experiment table seat 1, fixing a vertical inductance measuring head 18-1 of a displacement sensor 18 on the vertical brackets 23, and measuring vertical displacement of two ends of the loading plate 27; the horizontal displacement measurement auxiliary device 19 is fixed on four corners of the loading plate 27 through bolts, the horizontal inductance probe 18-2 of the displacement sensor 18 is fixed on the vertical bracket 23, and the relative displacement between the loading plate 27 and the test piece 12 is measured.
H. And (3) carrying out test loading, lifting or dropping the MTS actuator 3 according to test requirements, and observing the change state of the test piece.
The invention can perform shear bearing capacity test and performance test under reciprocating load on the embedded steel plate shear connector, and has accurate test data measurement and high precision. The test piece fixing system carries out loading test on the test pieces of the shear connectors with different lengths, and the support frame can be slidably adjusted along the long connecting holes of the fixing base. The test piece limiting system can ensure that the loading plate is always in a vertical plane in the loading process, and the loading plate is in a pure shearing state. The deformation measuring system can obtain the relative displacement between the loading plate and the fixing plate at the same time, and can comprehensively measure the deformation performance of the test piece. The test device has the advantages of simple integral structure, easy installation, accurate test data measurement and high precision.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the claims, but rather the equivalent structural changes made by the application of the present description and drawings are intended to be included within the scope of the claims.
Claims (6)
1. The utility model provides a shear force connecting piece bearing capacity vertical loading test device that shears, includes the experiment pedestal, symmetrical first, the second unable adjustment base of installation on the experiment pedestal, its characterized in that:
the first fixing base is a welding component and comprises a bottom plate, first channel steel, second channel steel, a top plate and a channel steel connecting plate, wherein the first channel steel and the second channel steel are vertically arranged, the notch of the first channel steel is opposite to the notch of the second channel steel, the lower ends of the first channel steel and the second channel steel are fixedly connected with the bottom plate, the upper ends of the first channel steel and the second channel steel are fixedly connected with the top plate, the top plate is provided with a long connecting hole, the middle parts of the first channel steel and the second channel steel are fixedly connected through the channel steel connecting plate, and the second fixing base has the same structure as the first fixing base;
one end of the fixed beam penetrates through a gap between the first channel steel and the second channel steel of the first fixed base, the other end of the fixed beam penetrates through a gap between the first channel steel and the second channel steel of the second fixed base, transverse fixed pressing beams are respectively arranged on the upper parts of the two ends of the fixed beam, the fixed pressing beams are welding members, each fixed pressing beam comprises a third channel steel and a fourth channel steel, the notches of the third channel steel and the fourth channel steel are oppositely arranged, and the third channel steel and the fourth channel steel are connected through steel plates; the experimental bench is provided with a plurality of T-shaped grooves, two ends of the fixed pressing beam are fixedly connected with the experimental bench through anchoring screws, nuts of the anchoring screws are arranged in the T-shaped grooves, and the fixed beam is I-steel or H-steel;
the test piece fixing system comprises a first support frame, a second support frame, a first transverse plate, a second transverse plate, a first connecting plate, a second connecting plate and a first connecting rod, wherein the first support frame and the second support frame are triangular welding members, the first support frame and the second support frame are arranged on two sides of the upper part of the first fixing base in parallel, the first transverse plate is arranged on the lower part of the inner sides of the vertical parts of the first support frame and the second support frame, and the second transverse plate is arranged on the upper part of the inner sides of the vertical parts of the first support frame and the second support frame; the two ends of the first transverse plate and the second transverse plate are respectively provided with a first vertical connecting plate and a second vertical connecting plate, the first connecting plate and the second vertical connecting plate are respectively arranged on the two sides of the first transverse plate and the second transverse plate, the upper end and the lower end of the first connecting plate and the upper end of the second connecting plate are respectively connected through a first connecting rod, and the first connecting plate and the second connecting plate are used for fixing a test piece;
the test piece limiting system is arranged on the second fixed base, the test piece limiting system has the same structure as the test piece fixing system, the test piece limiting system comprises a third supporting frame, a fourth supporting frame, a third transverse plate, a fourth transverse plate, a third connecting plate, a fourth connecting plate and a second connecting rod, the third connecting plate and the fourth connecting plate are respectively arranged on the inner sides of the third transverse plate and the fourth transverse plate, the upper end and the lower end of the third connecting plate and the lower end of the fourth connecting plate are connected through the second connecting rod, a loading plate is arranged between the third connecting plate and the fourth connecting plate, and the loading plate of the test piece limiting system is closely arranged in parallel with a test piece;
the two ends of the loading plate are respectively provided with a deformation measurement system, the deformation measurement system comprises displacement sensors, vertical inductance measuring heads of the displacement sensors are respectively arranged at the two ends of the bottom of the loading plate, horizontal inductance measuring heads of the displacement sensors are matched with a horizontal displacement measurement auxiliary device, the horizontal displacement measurement auxiliary device is arranged at four corners of the loading plate, and the vertical inductance measuring heads and the horizontal inductance measuring heads are fixedly connected with a bracket base through vertical brackets respectively; the upper part of the loading plate is fixedly connected with the lower end of an MTS actuator of the vertical loading system, the upper end of the MTS actuator is fixedly connected with the upper part of the portal, and the two ends of the bottom of the portal are fixedly connected with the experimental bench.
2. The shear connector shear capacity vertical loading test device according to claim 1, wherein: and vertical roller mechanisms are respectively arranged between the first connecting plate and the loading plate and between the second connecting plate and the loading plate, each roller mechanism comprises a first limiting plate, a second limiting plate and a roller, a plurality of shaft holes are symmetrically formed in the first limiting plate and the second limiting plate, and two ends of each roller are arranged in the shaft holes.
3. The shear connector shear capacity vertical loading test device according to claim 1, wherein: the horizontal displacement measurement auxiliary device is a steel plate welding member, the inner end of the horizontal displacement measurement auxiliary device is U-shaped, the inner end of the horizontal displacement measurement auxiliary device is fixedly connected with the loading plate through a bolt, and the outer end of the horizontal displacement measurement auxiliary device is parallel to the loading plate and extends out of the end face of the loading plate.
4. The shear connector shear capacity vertical loading test device according to claim 1, wherein: the vertical loading system comprises an MTS actuator and an actuator loading head, the actuator loading head comprises a I-steel and a loading head connecting plate, the upper parts of the actuator loading head and the I-steel are fixedly connected, a plurality of connecting holes are uniformly distributed on the lower part of the I-steel and two sides of a loading plate, the I-steel is fixedly connected with the loading plate through bolts, and the loading head connecting plate is connected with the lower end of the MTS actuator through bolts.
5. The shear connector shear capacity vertical loading test device according to claim 1, wherein: the displacement sensor is an LVDT linear displacement sensor.
6. A method of testing a shear connector shear load capacity vertical load testing device according to any one of claims 1-5, wherein: the method comprises the following steps:
A. the first fixed base and the second fixed base are installed and fixed, and the distance between the first fixed base and the second fixed base is determined and fixed according to the length of the shear connector;
B. installing an MTS actuator and an actuator loading head, wherein the MTS actuator coincides with the center of the actuator loading head;
C. hoisting a test piece, installing and adjusting the position of a loading plate, enabling the center of the loading plate to coincide with the center of a loading head of an actuator and the center of an MTS actuator, and connecting the loading plate with the loading head of the actuator through bolts;
D. installing a test piece fixing system, welding a first transverse plate and a second transverse plate on the inner surfaces of the vertical parts of the first support frame and the second support frame, determining the positions of the first support frame and the second support frame on the upper surface of the first fixing base according to the length of the shear connecting piece, fastening by bolts, and finally fixing the test piece on the first fixing base through the first connecting plate, the second connecting plate and the first connecting rod;
E. installing a test piece limiting system, namely, firstly correctly adjusting the positions of a third support frame and a fourth support frame and fixing the third support frame and the fourth support frame on a second fixed base by bolts, welding a third transverse plate and a fourth transverse plate on the inner surfaces of the vertical parts of the third support frame and the fourth support frame, and simultaneously installing a third connecting plate, a fourth connecting plate, a second connecting rod and a roller mechanism to fix the roller mechanism at the upper center and the lower center of a loading plate;
F. performing tiny correction according to the actual installation position of the test piece device, and finally fixing the first fixing base and the second fixing base on the experiment table seat through the fixing beam and the fixing pressing beam;
G. the method comprises the steps of installing a deformation measuring system, installing vertical supports on two sides of a loading plate, fixing the vertical supports on an experiment table seat, fixing a vertical inductance measuring head of a displacement sensor on the vertical supports, and measuring vertical displacement of two ends of the loading plate; fixing a displacement measurement auxiliary device at four corners of a loading plate through bolts, fixing a horizontal inductance measuring head of a displacement sensor on a vertical bracket, and measuring relative displacement between the loading plate and a test piece;
H. and (3) carrying out test loading, lifting or dropping the MTS actuator according to test requirements, and observing the change state of the test piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910224841.3A CN109781550B (en) | 2019-03-24 | 2019-03-24 | Vertical loading test device and method for shear connector |
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| CN111238938B (en) * | 2020-03-09 | 2024-07-02 | 华侨大学 | Lateral limiting loading device and application method thereof |
| CN111624154A (en) * | 2020-03-18 | 2020-09-04 | 同济大学 | Interface bonding performance single shear test testing device |
| CN112051133B (en) * | 2020-09-03 | 2024-04-05 | 华北科技学院 | Loading system for mechanical simulation test |
| CN112326461B (en) * | 2020-09-22 | 2022-02-22 | 河南大学 | Shear resistance test device for assembly type connecting piece |
| CN112179789B (en) * | 2020-11-13 | 2024-06-25 | 福州大学 | Assembled connector shearing test device and application method |
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