CN106442183B - Concrete component crack propagation loading device under a kind of reciprocating load - Google Patents
Concrete component crack propagation loading device under a kind of reciprocating load Download PDFInfo
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- CN106442183B CN106442183B CN201610856486.8A CN201610856486A CN106442183B CN 106442183 B CN106442183 B CN 106442183B CN 201610856486 A CN201610856486 A CN 201610856486A CN 106442183 B CN106442183 B CN 106442183B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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Abstract
The present invention provides concrete component crack propagation loading devices under a kind of reciprocating load, it includes MTS testing machine actuation head, axial force transducer, mountain font loading frame, bearing, square shaft bolster, power transmission steel shaft；Cyclic Loading during test passes sequentially through bearing, square shaft bolster and power transmission steel shaft by the middle section and two side portions of mountain font loading frame and is applied on concrete sample；Bearing is arranged using symmetrical square shaft bolster, is not only overcome the influence rotated between power transmission steel shaft and concrete sample, is also reduced the influence to rub in load transmission process；Real time load curve when the load curve of axial force transducer record can obtain fracture open, closure by the conversion of calculation formula.The present invention can crack for concrete sample, extension and the test of closing course provide reliable guarantee, and complete opening, the closing course for realizing crack can be used in the problem of observing the crack propagation process of concrete structure under dynamic load research.
Description
Technical field
The invention belongs to concrete component stretch under compression experiment technical field, more particularly to a kind of Under Dynamic Load
Compact tension and compression loading device provides a simulation concrete component under reciprocating load, and crack, which is realized, opens, is closed
The dynamic load loading device of process.
Background technique
In recent years, China is built or in the large quantities of hydraulic engineerings built, these hydraulic engineerings be located at mostly seismic activity compared with
Frequent northwest, southwest can not only promote socio-economic development, crucial moment for controlling and adjusting river waterflow
It may also function as adjusting flood peak, prevent the generation of flood.As the engineering material being most widely used in these hydraulic structures
One of material, concrete usually require to carry out ingredient, stirring, maintenance molding etc., each link is careless slightly to will affect its matter
Amount, along with reasons such as design, Construction control be not tight, natural calamity or structure agings, in concrete structure inevitably
The defects of will appear some cracks, hole.If the dam Koyna of India is after by earthquake, a large amount of cracks are generated, it is existing leak occur
As seriously threatening downstream the people's lives and property safety.Therefore, concrete structure crack under the reciprocating loads such as earthquake is probed into
Extension mechanism and rule, be of great significance to the security evaluation of hydraulic engineering.
Crack extension is described in fracture mechanics is divided into three kinds of citation forms: opening mode crack (I type), sliding mode crack (II
Type), tearing mode crack (type III).Concrete is typical fragile material, and failure mode is mainly I type crack.Although such as
This, these cracks are extended under reciprocating load, and process is also considerably complicated.Establishing suitable mechanical model is
Probe into the key of concrete structure propagation law under the Cyclic Loadings such as earthquake, and under reciprocating load concrete component cracking
Expanding test studies the verifying to mechanical model and provides very important meaning with foundation.
Currently, it is tough to obtain concrete component fracture under static load frequently with three-point bending beam test and compact tension test
Degree.Since dam concrete is generally fully graded concrete, sample dimensions are also bigger in corresponding test, and compact tension specimen tries
In testing, the influence being self-possessed to measurement is smaller, can more reflect structure reciprocal so carrying out experimental study using compact tension specimen
Stress characteristic under load.However, most of compact tension test contributes to the component under dead load effect, can not carry out
It is measured under dynamic load；There is partial monopoly to be proposed with spring or magnet offer pulling force, to realize the application of dynamic load, but due to bullet
The limitation of spring or magnet itself attribute, provided pulling force are limited, it is difficult to the closing course in crack is fully achieved, it is dynamic in test
Load and actual forced status have certain difference.The present invention provides concrete component crackings under a kind of reciprocating load to expand
Loading device is opened up, sufficient pressure can be provided to test, complete opening, the closing course for realizing crack.
Summary of the invention
Technical problem:
Prior art there are aiming at the problem that, the invention discloses one kind under reciprocating load concrete component
The tension and compression loading device of crack propagation occurs.The experimental rig method can provide sufficient pressure, complete to realize crack past
Opening, closing course under multiple load action, provide experiment item to probe into crack propagation mechanism of the concrete component under dynamic load
Part.
Technical solution:
Concrete component crack propagation loading device under a kind of reciprocating load, it is characterised in that made by MTS testing machine
Dynamic head, axial force transducer, mountain font loading frame, bearing, square shaft bolster, power transmission steel shaft composition；MTS testing machine actuation head,
Axial force transducer, mountain font loading frame are sequentially connected, and form the Cyclic Loading loading section on concrete sample；Bearing, side
Shape bearing bracket stand, power transmission steel shaft form the running part of the Cyclic Loading on concrete sample；Bearing is symmetrically distributed in square bearing
Frame quadrangle；Power transmission steel shaft is distributed at the quartile of two, concrete sample top；One prefabricated crack is arranged at concrete sample top；It is mixed
Solidifying soil test specimen bottom is placed on sample support.
The concrete sample is fully graded concrete test specimen, having a size of 450mm × 450mm × 200mm.In order to enable
There is a term of reference to the Cyclic Loading applied, the free from flaw test specimen of the identical proportion of a batch should be poured simultaneously, and measures its power
Learn parameter (such as: playing mould, Poisson's ratio, tensile strength).Band is calculated by numerical method further according to the mechanics parameter surveyed
Cyclic Loading when the crannied test specimen crack propagation.
The prefabricated crack is located at concrete sample upper end centerline, 1~3mm of width, 150~200mm of depth
It is advisable；The prefabricated crack, concrete sample, sample support three's center line are generally aligned in the same plane.
Steel shaft hole is provided at the quartile of the concrete sample top, power transmission steel shaft is placed through concrete sample top
Steel shaft hole at quartile, both ends are separately connected square shaft bolster；It is that can turn between the power transmission steel shaft and concrete sample
Dynamic.
Working principle:
During the test, Cyclic Loading is applied by MTS testing machine actuation head, is added by axial force transducer, mountain font
Carrier, bearing, square shaft bolster and power transmission steel shaft reach concrete sample.The installation of bearing can reduce mountain font loading frame and pass
Frictional influence between dynamic part.Due to needing to apply the contact surface of Cyclic Loading, mountain font loading frame centre and two sides and bearing
Make bearing rotation direction on the contrary, therefore multiple bearing mode need to be used.It is to overcome and pass that bearing, which is symmetrically arranged on square shaft bolster,
It is rotatably influenced between power steel shaft and concrete sample.The Cyclic Loading that power transmission steel shaft is transmitted by bearing is, it can be achieved that concrete tries
The cracking in prefabricated crack, extension and closing course on part.
Mountain font loading frame chooses smaller locking angle (such as α=15 °), and vertical load P lesser in this way can produce biggish
Horizontal loading F.If it is identical to load reciprocal process vertical load P, in downward loading procedure, pass through mountain font loading frame middle part
Give the resultant force of active force vertical component P/2 and the gravity of concrete sample and sample support for being added to two sides on concrete sample
Counter-force is cancelled out each other, level of force component F, and horizontally outward, mountain font loading frame two side portions do not generate additional work in direction
Firmly；When loading procedure is upward, the active force of two sides on concrete sample is applied to by mountain font loading frame two side portions
The resultant force of vertical component P/2 is cancelled out each other with the gravity of concrete sample and sample end reaction, level of force component F,
In the horizontal direction of direction, equally, mountain font loading frame middle section does not generate added force.Concrete sample stress condition is shown in attached
Fig. 4 and attached drawing 5, the size of level of force component F are as follows:
F=P/ (2 tan α).
The utility model has the advantages that
Concrete component crack propagation loading device, is drawn using compact under a kind of reciprocating load provided by the invention
Test specimen is stretched, gravity influences smaller, it is often more important that it is capable of providing sufficient pressure, it is complete to realize crack in reciprocating load
Under opening, the reciprocal process of closure, be conducive to observe under reciprocating load the cracking in crack in concrete component, extend and close
Conjunction process provides experiment condition to probe into crack propagation mechanism of the concrete structure under dynamic load.Operation of the present invention is convenient, safe
Controllably, apparatus structure is simple, low in cost, easy to maintenance, reusable, and the concrete sample of preparation meets requirement of experiment.
Detailed description of the invention
Fig. 1 is schematic diagram when concrete component crack propagation loading device is implemented under reciprocating load of the present invention；
Fig. 2 is front signal when concrete component crack propagation loading device is implemented under reciprocating load of the present invention
Figure；
Fig. 3 is edge-on signal when concrete component crack propagation loading device is implemented under reciprocating load of the present invention
Figure；
Fig. 4 is present invention concrete sample stress diagram described in loading procedure downwards；
Fig. 5 is present invention concrete sample stress diagram described in loading procedure upwards.
In figure:
1- sample support 2- concrete sample
3- bearing 4- square shaft bolster
The mountain 5- font loading frame 6-MTS testing machine actuation head
The prefabricated crack 7- axial force transducer 8-
9- power transmission steel shaft
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail.
As shown in Figure 1, implementing for concrete component crack propagation loading device under reciprocating load provided by the invention
When schematic diagram, including MTS testing machine actuation head (6), axial force transducer (7), mountain font loading frame (5), bearing (3), side
Shape bearing bracket stand (4), power transmission steel shaft (9) composition；MTS testing machine actuation head (6), axial force transducer (7), mountain font loading frame
(5) it is sequentially connected, Cyclic Loading loading section on composition concrete sample (2)；Bearing (3), square shaft bolster (4), power transmission steel
Axis (9) forms the running part of the Cyclic Loading on concrete sample (2)；Bearing (3) is symmetrically distributed in square shaft bolster (4) four
Angle；Power transmission steel shaft (9) is distributed at the quartile of concrete sample (2) two, top；Concrete sample (2) top has one prefabricated to split
It stitches (8)；Concrete sample (2) bottom is placed on sample support (1).
Specifically, the concrete sample (2) is fully graded concrete test specimen, having a size of 450mm × 450mm ×
200mm.In order to enable having a term of reference to the Cyclic Loading applied, the free from flaw examination of the identical proportion of a batch should be poured simultaneously
Part, and measure its mechanics parameter (such as: playing mould, Poisson's ratio, tensile strength).Further according to the mechanics parameter surveyed, pass through numerical value
Method, Cyclic Loading when calculating with the crannied test specimen crack propagation.
Specifically, the prefabricated crack (8) is located at concrete sample (2) upper end centerline, width 2mm, depth
180mm；Prefabricated crack (8), concrete sample (2), sample support (1) three's center line are generally aligned in the same plane, as shown in Figure 2.
Specifically, described its locking angle=15 ° of mountain font loading frame (5), loading frame two sides are corresponding with middle section parallel,
As shown in Fig. 2, vertical load lesser in this way can provide biggish horizontal loading.
Specifically, as shown in figure 3, the power transmission steel shaft (9) is placed through steel shaft at the quartile of concrete sample (2) top
Hole, both ends are separately connected square shaft bolster (4)；It is rotation between the power transmission steel shaft (9) and the concrete sample (2)
's.
During the test, Cyclic Loading is applied by MTS testing machine actuation head (6), passes through axial force transducer (7), mountain
Font loading frame (5), bearing (3), square shaft bolster (4) and power transmission steel shaft (9) reach concrete sample (2).
It is intermediate by mountain font loading frame (5) in downward loading procedure if it is identical to load reciprocal process vertical load P
Part be applied to the resultant forces of active force vertical component P/2 of two sides on concrete sample (2) and the gravity of concrete sample (2) and
Sample support (1) counter-force is cancelled out each other, level of force component F, direction horizontally outward, mountain font loading frame (5) two at this time
Side section does not generate added force；When loading procedure is upward, coagulation is applied to by mountain font loading frame (5) two side portions
The resultant force of the active force vertical component P/2 of two sides and the gravity of concrete sample (2) and sample support (1) are anti-on native test specimen (2)
Power is cancelled out each other, level of force component F, and in the horizontal direction of direction, equally, mountain font loading frame middle section is not generated at this time
Added force.The size of horizontal component F are as follows:
F=P/ (2 tan α)
In entire loading procedure, horizontal loading F action direction horizontally outward, is inwardly alternately present, and forms Cyclic Loading, is mixed
For solidifying soil test specimen (2) under reciprocating load, prefabricated crack (8) realizes cracking, extension and closing course, concrete sample (2)
Stress condition difference under reciprocating load is as shown in Figure 4 and Figure 5.
Claims (4)
1. concrete component crack propagation loading device under a kind of reciprocating load, it is characterised in that: make including MTS testing machine
Dynamic head, axial force transducer, mountain font loading frame, bearing, square shaft bolster, power transmission steel shaft；MTS testing machine actuation head, axial direction
Force snesor, mountain font loading frame are sequentially connected, and form the Cyclic Loading loading section on concrete sample；Bearing, square shaft
Bolster, power transmission steel shaft form the running part of the Cyclic Loading on concrete sample；Bearing is symmetrically distributed in square shaft bolster four
Angle；Steel shaft hole is provided at the quartile of concrete sample top, power transmission steel shaft passes through steel shaft hole, and both ends are separately connected rectangular
Bearing bracket stand；One prefabricated crack is arranged at concrete sample top；Concrete sample bottom is placed on sample support.
2. concrete component crack propagation loading device, feature under a kind of reciprocating load according to claim 1
Be: the concrete sample is fully graded concrete test specimen, having a size of 450mm × 450mm × 200mm.
3. concrete component crack propagation loading device, feature under a kind of reciprocating load according to claim 1
Be: the prefabricated crack is located at concrete sample upper end centerline, 1~3mm of width, 150~200mm of depth；Institute
The prefabricated crack stated, concrete sample, sample support three's center line are in same plane.
4. concrete component crack propagation loading device, feature under a kind of reciprocating load according to claim 1
It is: is rotatable between the power transmission steel shaft and concrete sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856486.8A CN106442183B (en) | 2016-09-27 | 2016-09-27 | Concrete component crack propagation loading device under a kind of reciprocating load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610856486.8A CN106442183B (en) | 2016-09-27 | 2016-09-27 | Concrete component crack propagation loading device under a kind of reciprocating load |
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| Publication Number | Publication Date |
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| CN106442183A CN106442183A (en) | 2017-02-22 |
| CN106442183B true CN106442183B (en) | 2019-01-08 |
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| CN109001061B (en) * | 2018-09-18 | 2021-05-18 | 河海大学 | Test device and method for applying continuous impact load |
| CN111398016B (en) * | 2020-03-30 | 2021-05-04 | 河海大学 | Soil body II type orthotic devices for fracture test |
| CN111398014B (en) * | 2020-03-30 | 2020-12-08 | 河海大学 | Correction method for shear-type fracture test of magnetic suspension soil body |
| CN111398017B (en) * | 2020-03-30 | 2020-12-29 | 河海大学 | Soil body slip type fracture test method based on magnetic suspension effect |
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