A limiting device for frame test out-of-plane instability

Abstract

The application relates to a limiting device for testing the out-of-plane instability of a frame, which comprises a limiting structure, the limiting structure comprising a counterforce frame and a limiting component, the counterforce frame being fixed to one side of a test piece, the limiting component comprising two groups of lateral connecting assemblies, two groups of middle connecting assemblies and at least two groups of pulley assemblies, wherein one side of the two groups of lateral connecting assemblies is connected with the counterforce frame, the other side is connected with the two groups of middle connecting assemblies, the two groups of middle connecting assemblies are oppositely arranged on the two sides of the test piece and are fixed with the pulley assemblies on the inner sides, and the two groups of middle connecting assemblies can be adjusted and positioned to the positions where the pulleys of the pulley assemblies press the sides of the test piece. The counterforce frame of the application is concentrated on the same side of the test piece, the space occupation of the test site is reduced, the performance change of the test piece can be observed by the tester on the other side, the test piece after the test can be detected, and the interference of the counterforce frame is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural engineering test equipment, and relates to a limiting device for out-of-plane instability of frame test, which is particularly suitable for quasi-static test of steel frame system. BACKGROUND

[0002] In structural engineering test, a large number of frame quasi-static tests are often carried out, in order to meet the test requirements, it is usually required to ensure that the frame beam does not occur out-of-plane instability in the test, which requires the use of appropriate limiting device to limit the out-of-plane deformation instability of the beam in the test, so as to ensure the acquisition of effective data.

[0003] At present, the frame test is prone to out-of-plane instability deformation or even torsion under the action of the horizontal actuator because the beam in the test piece is usually long. If a single point lateral support is used, the stress area of the frame beam will be small, and the overall instability will be easy to occur. Many lateral supports using double-point lateral support usually need to be arranged on both sides of the test piece, which often occupies a large test room space and affects the test observation. In addition, the limiting device needs to adjust the interval for the larger frame test piece or the larger eccentrically braced frame test piece. The existing out-of-plane instability limiting device has defects in space occupation, installation and removal, and adjustment. SUMMARY

[0004] In order to overcome the defects of the prior art, the purpose of the present application is to provide a limiting device for out-of-plane instability of frame test, which can effectively solve the problem of large out-of-plane bending and torsional instability of the frame in the test loading, improve the accuracy of the test, and has simple structure, convenient installation, space saving; at the same time, the reaction frame is installed on the same side, which reduces the occupation of the test site space.

[0005] The purpose of the present application and the technical problems solved thereby are achieved by using the following technical scheme. According to the present application, a limiting device for out-of-plane instability of frame test is provided, which comprises a limiting structure, the limiting structure comprises a reaction frame and a limiting component, the reaction frame is fixed on one side of the test piece, the limiting component comprises two groups of lateral connecting assemblies, two groups of intermediate connecting assemblies and at least two groups of pulley assemblies, one side of the two groups of lateral connecting assemblies is connected with the reaction frame, the other side is connected with the two groups of intermediate connecting assemblies, the two groups of intermediate connecting assemblies are oppositely distributed on both sides of the test piece and the inner side of each is fixed with a pulley assembly, and the two groups of intermediate connecting assemblies can be adjusted and positioned to the position of the pulley pressing the side of the test piece.

[0006] The purpose of the present application and the technical problems solved thereby can be further achieved by using the following technical measures.

[0007] The lateral connecting assembly is fixed on one side of the counter-force frame by bolts, and the holes for connecting the counter-force frame are long holes extending along the height direction, so as to adjust the height of the limiting component according to the test piece.

[0008] The lateral connecting assembly includes a vertical connecting plate for connecting the counter-force frame, a screw rod fixed on one side of the vertical connecting plate, and a plurality of nuts arranged on the screw rod, the intermediate connecting assembly is connected with the lateral connecting assembly through the screw rod and is locked and positioned with the lateral connecting assembly through the nuts.

[0009] The intermediate connecting assembly includes two vertical long holes and a non-hole short column connected between the two long holes, the holes in the long holes are used for the screw rods of the corresponding lateral connecting assembly to pass through, and the screw rods are locked and positioned on the screw rods through the nuts.

[0010] The long holes and the non-hole short column are box-shaped short columns.

[0011] The pulley assembly includes a pulley connecting plate fixed on the inner side of the non-hole short column and a pulley rotatably arranged at the front end of the sliding connecting plate in the extension direction of the test piece, so as to reduce the influence of the friction between the pulley assembly and the test piece on the test result.

[0012] The pulley assembly further includes two short plates and a screw column and nuts for pressing and fixing the two short plates on the non-hole short column, and one of the short plates is fixed at the end of the pulley connecting plate.

[0013] The pulley is rotatably arranged at the front end of the pulley connecting plate by a bolt passing through the shaft hole of the pulley.

[0014] The limiting structure has two groups, which are symmetrically distributed at both ends of the test piece to meet the test requirements of large-size test pieces.

[0015] The limiting structure has two groups, which are symmetrically distributed at both ends of the test piece to meet the test requirements of large-size test pieces.

[0016] Compared with the prior art, the frame beam plane limiting device provided by the application has the advantages of simple structure, reasonable structure, low cost, changeable device size according to actual test site and equipment, small occupied space, simple structure, convenient installation and reliable effect.

[0017] Compared with the prior art, the frame beam plane limiting device provided by the application has the advantages of simple structure, reasonable structure, low cost, changeable device size according to actual test site and equipment, small occupied space, simple structure, convenient installation and reliable effect. Meanwhile, the frame beam plane limiting device can effectively simulate the constraint condition of a frame beam and can be widely applied to the plane constraint of various frame beams.

[0018] Meanwhile, the reaction force frame of the application is concentrated on the same side of the test piece, thereby reducing the occupation of the test site space and facilitating the observation of the performance change of the test piece and the detection of the test piece after test by the test personnel on the other side, so that the interference of the reaction force frame is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is an embodiment schematic view of the limiting device for out-of-plane instability of the frame test of the application;

[0020] Figure 2 It is a limiting component schematic view of the limiting device for out-of-plane instability of the frame test of the application;

[0021] Figure 3 It is a top view of the application; Figure 2

[0022] Figure 4 It is a middle assembly schematic view;

[0023] Figure 5 It is a pulley set schematic view.

[0024] MAIN ELEMENT SYMBOL EXPLANATION

[0025] 10, reaction force frame

[0026] 11, steel frame column

[0027] 12, patch

[0028] 20, lateral connection assembly

[0029] 21, vertical connection plate

[0030] 22, nut

[0031] 23, screw rod

[0032] 30, middle assembly

[0033] 40, pulley assembly

[0034] 31, hole box type short column ​

[0035] 32. The box short column without hole

[0036] 41. The bolt

[0037] 42. The short plate

[0038] 43. The pulley connecting plate

[0039] 44. The pulley

[0040] 50. The test piece

[0041] 60. The limiting structure DETAILED DESCRIPTION

[0042] In order to further clarify the technical means and effects taken by the present application to achieve the predetermined inventive purpose, the specific implementation, structure, features and effects of the limiting device for out-of-plane instability of frame test plane according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0043] Please refer to Figures 1-5 , which is a schematic diagram of the structure of each part of the limiting device for out-of-plane instability of frame test plane according to the present application. The limiting device includes two sets of limiting structures, each set of limiting structure 60 including a counter-force frame 10 and a limiting component. The counter-force frame 10 is fixed on one side of the test piece 50, and the limiting component is used to press and limit the two sides of the crossbeam of the test piece 50 to prevent it from deforming to the two sides and appearing out-of-plane instability, and one side of the limiting component is connected and fixed with the counter-force frame 10.

[0044] The limiting component includes two sets of lateral connecting assemblies 20, two sets of intermediate connecting assemblies 30 and at least one set of pulley assemblies 40. The lateral connecting assembly 20 includes a vertical connecting plate 21 for connecting and fixing with the counter-force frame 10, a horizontal screw rod 23 fixed at one end of the side of the vertical connecting plate 21, and a plurality of nuts 22 screwed on the screw rod 23. In this embodiment, five nuts 22 are provided on a single screw rod 23, one of which is used to achieve the locking and fixing of the screw rod 23 with the vertical connecting plate 21. The vertical connecting plate 21 is provided with a plurality of positioning screw holes along its height direction for connecting and fixing with the counter-force frame 10 by bolts. In this embodiment, the height of the vertical connecting plate 21 is adjustable, and the connecting height of the vertical connecting plate 21 can be selected according to the height of the test piece to enhance the applicability of the limiting device. Preferably, the positioning screw hole is a long hole extending along the height direction, but it is not limited to this. The diameter of the screw rod 23 is preferably 40 mm.

[0045] The intermediate connecting assembly 30 comprises two vertically extending short columns with holes 31 and a short column without hole 32 connected between the two short columns with holes 31. Two sets of the intermediate connecting assembly 30 are arranged in parallel on both sides of the beam of the test piece 50, forming a rectangular frame structure. When the limiting component is assembled, the screw rod 23 of one set of the lateral connecting assembly 20 passes through the through hole on one side of the short column with hole 31 of the intermediate connecting assembly 30, and is locked and positioned with the short column with hole 31 by the nut on the screw rod 23; the screw rod 23 of the other set of the lateral connecting assembly 20 passes through the through hole on the other side of the short column with hole 31 of the intermediate connecting assembly 30 arranged in parallel, and is locked and positioned with the short column with hole 32 by the nut on the screw rod 23, thereby completing the assembly of the intermediate connecting assembly 30 and the lateral connecting assembly 20.

[0046] In this embodiment, the short column with hole 31 and the short column without hole 32 are both box-shaped short columns. The short column without hole 32 is connected and fixed with the two short columns with hole 31 by welding.

[0047] The pulley assembly 40 comprises a pulley connecting plate 43 fixed on the short column without hole 32 of the intermediate connecting assembly 30, and each pulley connecting plate 43 is rotatably provided with a pulley 44 at the front end. When limiting, the position of the intermediate connecting assembly 30 on the screw rod is adjusted, so that the pulley 44 of the pulley assembly 40 presses the side of the beam of the test piece 50. Since the two sets of intermediate connecting assemblies 30 are arranged in parallel, the pulley assembly 40 arranged on the short column without hole 32 of the two sets of intermediate connecting assemblies 30 can press the two sides of the beam, and the contact between the pulley assembly 40 and the beam is rotary abutment, which can effectively avoid the influence of friction on the test.

[0048] When the limiting component is assembled, at least one set of pulley assemblies 40 is arranged on the short column without hole 32 of the two sets of intermediate connecting assemblies 30 arranged in parallel and forming a frame structure in the extending direction of the short column without hole 32, and the pulley assemblies 40 on the two sets of intermediate connecting assemblies 30 are also symmetrically distributed, forming at least one clamping pair to achieve clamping and limiting of the two sides of the beam of the test piece 50.

[0049] In this embodiment, the pulley assembly 40 further comprises two short plates 42 and a stud and nut for connecting and adjusting the distance between the two short plates 42. One of the two short plates 42 is fixed at the tail of the pulley connecting plate 43, the pulley assembly 40 is clamped on both sides of the short column without hole 32 of the intermediate connecting assembly 30 through the two short plates 42, and is pressed and fixed on the short column without hole 32 by adjusting the stud and nut. Specifically, the stud has two groups distributed vertically to the sliding direction of the pulley 44, and the distance between the two groups of studs is greater than the width of the short column without hole 32 in the vertical direction. The arrangement of the end plate and the stud in this embodiment can adjust the distribution position and the distribution number of the pulley assembly 40 on the intermediate connecting assembly 30.

[0050] In this embodiment, the pulley 44 is rotatably arranged at the front end of the pulley connecting plate 43 by the bolt 41, and specifically, the pulley 44 is arranged in parallel with the front end of the pulley connecting plate 43, and the bolt 41 passes through the shaft hole of the pulley connecting plate 43 and the pulley 44, thereby achieving the rotatable arrangement of the pulley 44.

[0051] The sliding direction of the pulley 44 of the pulley assembly 40 is perpendicular to the short plate 42, so as to ensure that, after being fixed by the short plate, the pulley 44 is vertically pressed against the side surface of the beam of the test piece 50 and can rotate relative to the beam along the extension direction of the beam.

[0052] In this embodiment, each set of limiting structure 60 includes four pulley assemblies, but is not limited thereto.

[0053] In this embodiment, two sets of limiting structure 60 are included, and the two sets of limiting structure 60 are distributed in a spaced manner along the extension direction of the beam of the test piece. When the lengths of the test pieces are different, the distribution positions of the two sets of limiting structure 60 can be adjusted by adjusting the spacing of the counterforce frames. Preferably, the two sets of limiting structure 60 are respectively distributed at the positions where the planar instability is prone to occur at the two ends of the beam.

[0054] In this embodiment, the counterforce frame 10 is composed of an H-shaped steel frame column 11 and a plurality of fillet strips 12. Preferably, the counterforce frame 10 is composed of a fixed bottom plate, four H-shaped steel frame columns 11 welded on the fixed bottom plate, and a fillet strip 12 for connecting adjacent H-shaped steel frame columns 11.

[0055] In the above H-shaped steel frame column, the H-shaped steel frame column 11 close to the test piece 50 is further provided with a threaded hole for fixing a vertical connecting plate 21, and the vertical connecting plate 21 is installed on the same side of the frame column 11 of the counterforce frame 10 by a bolt. When the heights of the test pieces are different, the height of the limiting structure can be selected by adjusting the position of the vertical connecting plate 21 and the steel frame column 11 in cooperation with the positioning, thereby facilitating the disassembly and assembly of the limiting structure.

[0056] The out-of-plane limiting device of the frame test plane in use first fixes the reaction force frame on one side of the test piece, and adjusts the distance between the two groups of reaction force frames according to the length of the test piece, so that the two groups of reaction force frames are symmetrically distributed at the two ends of the test piece. Then the intermediate connecting assembly 30 on one side of the reaction force frame is preliminarily assembled with the two groups of lateral connecting assemblies, and then the two groups of lateral connecting assemblies are fixed on one side of the reaction force frame, and finally the other intermediate connecting assembly assembled with the pulley assembly is connected with the two groups of lateral connecting assemblies, and the position of the two groups of intermediate connecting assemblies is adjusted, so that the pulleys 44 of the pulley assemblies on the intermediate connecting assemblies press the cross beam of the test piece 50 on both sides, and the position of the intermediate connecting assemblies is kept through the nut. When the test piece produces out-of-plane deformation, the pulleys in the pulley assembly will produce resistance to the test piece to prevent its deformation, thereby solving the problem of out-of-plane torsional deformation of the test frame during loading.

[0057] In the embodiment of the present application, the test piece 50 includes supports at both ends and a cross beam in the middle. At this time, two sets of limiting structures are used to limit the cross beam on both sides to prevent out-of-plane instability. At this time, the two sets of limiting structures are symmetrically distributed at both ends of the cross beam. For the test piece without support, when the extension length is small, only one limiting structure can be used for limiting. At this time, the limiting structure is located at the end of the test piece away from the horizontal load applying device. When the extension length is large, two sets of limiting structures are still used for limiting. At this time, the two sets of limiting structures are symmetrically distributed at both ends of the test piece.

[0058] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A limiting device for out-of-plane instability in a frame test, characterized in that: The device includes a limiting structure comprising a reaction frame and limiting components. The reaction frame is fixed to one side of the test piece. The limiting components include two sets of lateral connecting assemblies, two sets of intermediate connecting assemblies, and at least two sets of pulley assemblies. One side of each of the two sets of lateral connecting assemblies is connected to the reaction frame, and the other side is connected to the two sets of intermediate connecting assemblies. The two sets of intermediate connecting assemblies are distributed opposite each other on both sides of the test piece, and pulley assemblies are fixed to their inner sides. The two sets of intermediate connecting assemblies can be adjusted and positioned so that the pulleys of the pulley assemblies press against the side of the test piece. Each intermediate connecting assembly includes two vertically extending perforated short columns and a non-perforated short column connected between the two perforated short columns. The holes on the perforated short columns allow the screws of the corresponding sets of lateral connecting assemblies to pass through, and the screws are locked and positioned by nuts. Both the perforated and non-perforated short columns are box-shaped short columns. Each pulley assembly includes a pulley connecting plate fixed to the inner side of the non-perforated short column and a pulley that is rotatably and slidably disposed at the front end of the pulley connecting plate along the extension direction of the test piece.

2. The limiting device for out-of-plane instability of the frame test according to claim 1, characterized in that: The lateral connection assembly is fixed to one side of the reaction frame by bolts, and the holes connecting the lateral connection assembly to the reaction frame are a number of elongated holes distributed and extending along the height direction.

3. The limiting device for out-of-plane instability in a frame test according to claim 2, characterized in that: The lateral connection assembly includes a vertical connection plate for connecting with the reaction frame, a screw fixed to one side of the vertical connection plate, and several nuts on the screw. The intermediate connection assembly is connected to the lateral connection assembly via the screw and is locked and positioned with the lateral connection assembly via the nuts.

4. The limiting device for out-of-plane instability in a frame test according to claim 1, characterized in that: Each set of intermediate connecting components has at least one set of pulley assemblies along the extension direction of the test piece, and the pulley assemblies on the two sets of intermediate connecting components are symmetrically distributed on the test piece.

5. The limiting device for out-of-plane instability in a frame test according to claim 4, characterized in that: The pulley assembly also includes two short plates and studs and nuts that press the two short plates together and fix them to the short post without holes, with one of the short plates fixed to the end of the pulley connecting plate.

6. The limiting device for out-of-plane instability in a frame test according to claim 5, characterized in that: The pulley is rotatably mounted on the front end of the pulley connecting plate by a bolt, which passes through the shaft hole of the pulley.

7. The limiting device for out-of-plane instability of a frame test according to any one of claims 1-6, characterized in that: The limiting structure consists of two sets, which are symmetrically distributed at both ends of the test piece.

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