CN111595575B - Parallel loading test device for actuators - Google Patents
Parallel loading test device for actuators Download PDFInfo
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- CN111595575B CN111595575B CN202010597741.8A CN202010597741A CN111595575B CN 111595575 B CN111595575 B CN 111595575B CN 202010597741 A CN202010597741 A CN 202010597741A CN 111595575 B CN111595575 B CN 111595575B
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- G01—MEASURING; TESTING
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- G01M13/00—Testing of machine parts
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Abstract
The invention relates to an actuator parallel loading test device, which comprises: the dynamic loading device, the pressure beam that is connected with the dynamic loading device, the loading beam that is connected with the test piece and the articulated joint that will press the beam to be connected with the loading beam, wherein, press the beam the loading beam is followed dynamic loading device's biography power direction symmetric distribution, when carrying out the loading test, the test piece is firmly connected with the loading beam, just the dynamic action point that closes that a plurality of actuators were applyed press the beam with the articulated central point of loading beam, the center of loading beam and the rigidity center of test piece all are on same straight line. The invention realizes the parallel synchronous loading of a plurality of actuators through the arrangement of the pressing beam and the hinged joint, solves the problems that the large-tonnage loading is limited by the range of a single actuator and the rigid connection is easy to generate extra torque due to the asynchronous actuators, reduces the torsional eccentricity to the maximum extent, limits the torsional deformation of a test piece and eliminates the torsional effect of the test piece caused by the load.
Description
Technical Field
The invention relates to the technical field of civil engineering structure test devices, in particular to an actuator parallel loading test device.
Background
In concrete structures, steel structures and composite structural systems, members such as walls, columns and beams with rectangular cross sections are usually combined into special-shaped combined cross sections such as T-shaped, I-shaped, C-shaped and L-shaped sections for meeting the using functions and structural stress requirements of buildings, such as wing walls, corner walls, special-shaped columns and T-shaped beams with edge members. The application of the special-shaped combined section component is very wide, and the mechanical property of the special-shaped combined section component is the key point and the hot point of structural engineering test research. However, the mechanical property test of these special-shaped combined cross-section test pieces mainly has two problems: on one hand, the special-shaped combined section test piece often has higher limit bearing capacity due to the existence of flanges, particularly a full-scale model test piece; on the other hand, due to the asymmetry of the special-shaped combined section, the test pieces are easy to generate a torsion effect under the action of load, and the torsion effect is more obvious when the load action is larger.
The problem that the range of a single actuator can not reach the limit bearing capacity of a special-shaped combined section test piece can be solved by the aid of parallel loading of the plurality of actuators. However, in the conventional multi-actuator parallel connection mode, the multiple actuators are connected with the test piece through the rigid connecting device, and the multiple actuators are asynchronous, so that the test piece with the special-shaped combined section can bear an additional torque effect, and the influence of the torsion effect on the test result is further aggravated.
Disclosure of Invention
The invention aims to provide an actuator parallel loading test device, which realizes the parallel use of a plurality of actuators and avoids the additional torque action (not only suitable for a special-shaped section test piece) on the test piece caused by the possible asynchronous parallel actuators.
The scheme adopted by the invention for solving the technical problems is as follows:
an actuator parallel loading test device, comprising: the dynamic loading device, the pressure beam connected with the dynamic loading device and the loading beam hinged with the pressure beam are arranged, wherein the pressure beam and the loading beam are symmetrically distributed along the force transmission direction of the dynamic loading device, a test piece is fixedly connected with the loading beam when a loading test is carried out, and the acting point of resultant force applied by the dynamic loading device, the hinged central point of the pressure beam and the loading beam, the center of the loading beam and the rigidity center of the test piece are all on the same straight line.
Furthermore, a plurality of power loading devices are arranged on the pressing beam in parallel, and the acting points of the combined power exerted by the power loading devices coincide with the central point of the pressing beam.
Further, press the roof beam with the load beam passes through the hinge and connects, the hinge is including setting up first connector on the pressure beam, setting are in second connector on the load beam and general first connector with the bolt that the second connector is connected, the center of bolt and the center of pressing the roof beam are on same straight line.
Furthermore, the second connector is clamped in the first connector, bearing covers which limit the first connector and the second connector at the inner sides of the first connector and the second connector are arranged at two ends of the bolt, and the bearing covers are respectively and fixedly abutted against two end sides of the first connector.
Further, the maximum deflection of the compression beam is 1 mm.
Furthermore, the compression beam is of a symmetrical box-type structure and comprises a compression beam top plate, a compression beam bottom plate, a plurality of compression beam webs arranged between the compression beam top plate and the compression beam bottom plate and distributed along the length direction, and a plurality of compression beam partition plates arranged on the compression beam webs in the length direction perpendicular to the compression beam webs.
Further, the power loading device is connected with the pressing beam through a loading seat.
Furthermore, a loading beam fixing plate is fixedly arranged on the side surface of the loading beam facing the pressing beam, and the loading beam fixing plate is hinged with the pressing beam.
Furthermore, the loading beam is of a symmetrical box-type structure and comprises a loading beam top plate, a loading beam bottom plate, a plurality of loading beam webs arranged between the loading beam top plate and the loading beam bottom plate and distributed along the length direction, and a plurality of loading beam partition plates distributed in the length direction perpendicular to the loading beam webs.
Compared with the prior art, the invention has at least the following beneficial effects:
1) the pressing beam and the loading beam are connected in a hinged mode through the hinged joint, so that resultant force applied by a plurality of actuating forces connected in parallel is collected to the hinged point, and therefore, when a large-tonnage load is carried out, even if a plurality of actuators are connected in parallel and do not synchronously carry out power output in the actual operation process, the torsion of a special-shaped section test piece can be prevented through the movable connection of the hinged joint.
2) The maximum deflection of the pressing beam is 1mm, the pressing beam is completely symmetrical box-shaped, and the plurality of actuators connected in parallel are symmetrically arranged on the pressing beam, so that the positions of the acting points of the resultant forces of the actuators are known, the resultant force is ensured to pass through the rigid center of the test piece, the torsional eccentricity is reduced to the maximum extent, the torsional deformation of the test piece is limited, and the torsional effect of the test piece caused by load is eliminated.
Drawings
FIG. 1 is a front view of a test piece loading test apparatus according to an embodiment of the present invention;
FIG. 2 is a top view of a test piece loading test apparatus according to an embodiment of the present invention;
FIG. 3 is a front view of a compression beam according to an embodiment of the present invention;
FIG. 4 is a sectional view taken along line A-A of FIG. 3;
FIG. 5 is a left side view of a compression beam according to an embodiment of the present invention;
FIG. 6 is a front view of a first connector according to an embodiment of the present invention;
FIG. 7 is a top view of a first connector according to an embodiment of the present invention;
fig. 8 is a front view of a second connecting head according to an embodiment of the present invention;
FIG. 9 is a top view of a second connecting head according to an embodiment of the present invention;
FIG. 10 is a front view of a load beam in an embodiment of the present invention;
FIG. 11 is a schematic view of FIG. 10 taken along line B-B;
fig. 12 is a left side view of a load beam in an embodiment of the present invention.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the invention provides an actuator parallel loading test device, which comprises a power loading device, a compression beam 3 connected with the power loading device 1 through a loading seat, a loading beam fixing plate 6 hinged with the compression beam 3, and a loading beam 7 fixed on the loading beam fixing plate 6 and far away from the side surface of the compression beam. In this embodiment, this power loading device is actuator 1, and the loading seat is actuator steel seat 2, and a plurality of actuators 1 set up in parallel and are connected with pressure beam 3 through actuator steel seat 2 respectively. Specifically, in this embodiment, two actuators 1 are provided, the two actuators 1 are respectively fixed on the pressing beam 3 in parallel through the actuator steel base 2, the actuator steel base 2 is horizontally fixed on the actuator 1 and between the pressing beams 3 by bolts, and the two actuator steel bases 2 are symmetrically arranged along the center line of the pressing beam 3, so as to ensure the acting force output effect of the two actuators 1, thereby realizing the parallel connection of the two actuators 1.
The pressing beam 3 is hinged with the loading beam fixing plate 6 through a hinge joint. The hinged joint comprises a first connector 4 arranged on the pressing beam 3, a second connector 5 arranged on the loading beam fixing plate 6 and a bolt 8 for connecting the first connector 4 and the second connector 5, wherein the center of the bolt 8 is in the same straight line with the center of the pressing beam 3 in order to prevent torsion.
In this embodiment, the pressing beam 3 is connected with the first connector 4, the second connector is clamped in the first connector 4, the bolt 8 penetrates through the first connector 4 and the second connector 5 from top to bottom, and then the bearing covers 9 are welded at the upper end and the lower end of the bolt 8 to limit the first connector and the second connector between the two bearing covers, so that the resultant force action points caused by the movement of the first connector 4 and the second connector 5 on the bolt when stressed are prevented from being deviated. The loading beam fixing plate 6 is connected to the loading beam 7 through bolts, so that the acting force output of the two actuators 1 is converted to the loading beam 7, and the effects that the T-shaped shear wall member, the L-shaped shear wall member and other special-shaped cross sections do not twist under the low-period reciprocating action and a plurality of actuators are connected in parallel and used synchronously are achieved. In the manufacturing process of the test piece loading test device, the components such as the pressing beam 3, the hinged joint, the loading beam fixing plate 6, the loading beam 7 and the like are ensured to be symmetrically distributed along the resultant force transmission direction of the plurality of actuators 1. In the pseudo-static anti-seismic test examples of the T-shaped and L-shaped shear walls with the special-shaped cross sections (namely, the horizontal force is loaded by adopting low-period reciprocating action and is 1975.73KN at most), the compression beam 3 smoothly and uniformly transmits the power of the two actuators 1 to the loading beam 7 and then acts on the shear wall, and T-shaped and L-shaped shear wall test pieces are not twisted under the low-period reciprocating action, so that the use of the device has a better test effect and achieves the use function.
For further explanation, as shown in fig. 3 to 5, the compression beam 3 is a completely symmetrical box-shaped structure, which includes a compression beam top plate 30, a compression beam bottom plate 31, two compression beam webs 33 disposed between the compression beam top plate 30 and the compression beam bottom plate 31 and arranged in a length direction, and a plurality of compression beam stiffeners 32 disposed vertically on the compression beam webs 33 and perpendicular to the compression beam top plate 30, the compression beam bottom plate 31 and the compression beam stiffeners. Specifically, in the present embodiment, the thickness of the top plate 30 and the bottom plate 31 is 50mm, the height thereof is 400mm, the length of the web 33 is 2000mm, the height thereof is 500mm, and the thickness thereof is 30mm, which are the same as those of the top plate 30 and the bottom plate 31. The compression beam stiffeners 32 are 30mm thick and spaced apart by distances of 150mm, 200mm, 250mm, wherein a plurality of compression beam stiffeners 32 are symmetrically disposed on the compression beam web 33. The pressing beam top plate 30 of the pressing beam 3 is connected with the actuator steel seat 2, the radius of a reserved bolt hole is 15mm, and the position of the hole is determined according to the measurement of the horizontal distance of the actuator 1. In addition, the pressing beam is made of a material with high rigidity in the process of manufacturing the pressing beam 3, and the maximum deflection of the pressing beam 3 is ensured to be 1mm, so that the parallel resultant force of the plurality of actuators 1 in the loading process is not deviated, and the whole process passes through the rigid core of the special-shaped section test piece.
As shown in fig. 6 and 7, the first connecting head 4 is two first U-shaped steel plates 40 arranged at intervals, and the distance 41 between the first U-shaped steel plates is 300mm, and the first connecting head is installed by aligning the reserved hole of the first connecting head 4 with the reserved hole on the pressing beam bottom plate 31 of the pressing beam 3, wherein the radius of the reserved hole of the first connecting head is 20mm, and the distance between the reserved holes is 60 mm. Two first U-shaped steel plates 40 pass through the reserved holes through bolts and are fixed on the pressing beam 3. The thickness of the two first U-shaped steel plates is 100mm, the length is 900mm, the width is 450mm, and the radius of the pin hole 42 reserved on the first connecting plate is 100 mm.
As shown in fig. 8 and 9, the second connector 5 is two second U-shaped steel plates 50 which are combined together, that is, the two second U-shaped steel plates 50 are welded together, the thickness of the two second U-shaped steel plates 50 is also 100mm, the length is 900mm, the width is 450mm, and the radius of the pin hole 51 reserved on the two second U-shaped steel plates is 100 mm. During installation, the two connected second U-shaped connecting plates 50 are clamped into the space 41 between the two first U-shaped connecting plates 40, the pin holes 51 reserved on the two second U-shaped connecting plates are aligned with the pin holes 42 reserved on the first connecting head 4, and the pin 8 coated with lubricating oil and welded with the bearing plate 9 at one end sequentially penetrates through the first connecting head 4 and the second connecting head 5 from top to bottom. The purpose of lubricating oil coating is to reduce friction, and another bearing plate 9 is welded at the lower end of the bolt 8, wherein the thickness of the bearing plate 9 is 10mm, and the radius is 110 mm. And finally, aligning the reserved hole of the loading beam fixing plate 6 with the reserved hole of the second connector 5, and connecting the reserved hole and the second connector by using a bolt, wherein the radius of the reserved hole is 20mm, the thickness of the loading beam fixing plate 6 is 50mm, the length of the loading beam fixing plate is 900mm, and the width of the loading beam fixing plate is 400 mm.
As shown in fig. 10 to 12, the load beam 7 is also a completely symmetrical box-shaped structure, and includes a load beam top plate 70, a load beam bottom plate 71, and two load beam webs 72 disposed between the load beam top plate 70 and the load beam bottom plate 71 and arranged in a length direction, and a load beam stiffener 73 disposed perpendicularly on the load beam webs 72 and perpendicular to the load beam top plate. The thickness of the load beam top plate 70 and the load beam bottom plate 71 are both 30mm, the length is 500mm, and the width is 400 mm. The two loading beam webs 72 are 30mm in thickness, 170mm in distance, 500mm in length as the loading beam top plate 14 and 140mm in width; the load beam stiffeners 73 are 30mm thick and are arranged 120mm apart.
When the test piece loading test device is applied, the loading beam 7 of the test piece loading device is poured in the special-shaped section shear wall, the two actuators 1 are started to simultaneously press the pressing beam 3, power on the two actuators 1 is transmitted to the hinged joint through the actuator steel seat 2 in a balanced mode, then the power is transmitted to the loading beam 7 and the special-shaped section shear wall test piece fixedly connected with the loading beam 7 from the hinged joint, and finally the T-shaped and L-shaped special-shaped section shear wall test pieces are tested to be free of torsion under the low-cycle reciprocating action. The invention collects the resultant force exerted by a plurality of actuators 2 connected in parallel to the hinge point and transmits the resultant force to the test piece through the hinge point, the rigid connection is converted into the hinge connection, and the center of the pressure beam 3, the center of the hinge point and the center of the loading beam 7 are all on the same straight line, thereby ensuring that the resultant force passes through the rigid center of the test piece, reducing the torsional eccentricity to the maximum extent, limiting the torsional deformation of the test piece and eliminating the torsional effect of the test piece caused by load.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. An actuator parallel loading test device, comprising: a plurality of actuators, with the pressure roof beam that a plurality of actuators are connected and with the loading roof beam of pressure roof beam articulated, a plurality of actuators are parallelly connected to be set up on the pressure roof beam, just the central point coincidence that closes power action point and pressure roof beam that a plurality of actuators were applyed, wherein, the pressure roof beam the loading roof beam is followed the biography power direction symmetric distribution of a plurality of actuators is carrying out the loading test when, the test piece with loading roof beam fixed connection, just closing power action point that a plurality of actuators were applyed the pressure roof beam with the articulated central point of loading roof beam the center of loading roof beam and the rigidity center of test piece all are on same straight line.
2. The actuator parallel loading test device according to claim 1, wherein the pressing beam is connected with the loading beam through a hinge joint, the hinge joint comprises a first connector arranged on the pressing beam, a second connector arranged on the loading beam and a bolt connecting the first connector and the second connector, and the center of the bolt is on the same straight line with the center of the pressing beam.
3. The actuator parallel loading test device according to claim 2, wherein the second connector is clamped in the first connector, bearing covers for limiting the first connector and the second connector at the inner sides of the first connector and the second connector are arranged at two ends of the plug, and the bearing covers are respectively and fixedly abutted against two end sides of the first connector.
4. Actuator parallel loading test device according to claim 1, wherein the maximum deflection of the compression beam is 1 mm.
5. The actuator parallel loading test device as claimed in claim 1, wherein the compression beam is a symmetrical box-type structure, and comprises a compression beam top plate, a compression beam bottom plate, a plurality of compression beam webs arranged between the compression beam top plate and the compression beam bottom plate and distributed along the length direction, and a plurality of compression beam separators arranged on the compression beam webs in a direction perpendicular to the length direction of the compression beam webs.
6. The actuator parallel loading test device of claim 1, wherein the plurality of actuators are connected to the compression beam by load blocks.
7. Actuator parallel loading test device according to claim 1, wherein a loading beam fixing plate is fixedly arranged on the side of the loading beam facing the compression beam, and the loading beam fixing plate is hinged to the compression beam.
8. The actuator parallel loading test device as claimed in claim 1, wherein the loading beam is a symmetrical box-shaped structure, and comprises a loading beam top plate, a loading beam bottom plate, a plurality of loading beam webs arranged between the loading beam top plate and the loading beam bottom plate and distributed along the length direction, and a plurality of loading beam partition plates distributed perpendicular to the length direction of the loading beam webs.
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