A concrete joint interface compression-bending-shear stress testing device

Abstract

The utility model discloses a concrete joint interface compression bending shear stress test device in the field of concrete performance testing device, is used to carry out compression bending shear stress test to test piece group, and the test device includes: vertical counterforce frame, including the support of bottom and counterforce beam of top, vertical loading assembly, is located on counterforce beam, realizes the loading of verticality to second test piece, horizontal counterforce frame, is covered in second test piece outside, horizontal loading assembly, is located in horizontal counterforce frame inside, sensing module, the utility model has the beneficial effects that: through setting up vertical loading assembly, horizontal loading assembly and sensing module, can effectively simulate the joint interface stress condition of concrete in actual use, can be more accurate to the stress capacity of concrete joint interface carries out the experiment, simple structure, convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of concrete performance testing devices, specifically to a concrete joint interface compression-bending-shear stress testing device. Background Technology

[0002] In the construction of cross-sea bridges, overpass bridges, and industrial and civil building structures, projects often encounter situations where the construction space is limited, the construction period is short, and the construction quality requirements are high. Ordinary cast-in-place concrete structures are difficult to meet these requirements, so the construction of precast concrete components has emerged.

[0003] The biggest difference between precast concrete component construction and cast-in-place construction lies in the presence of construction joint interfaces. The former is prone to cracking under loads such as vehicles and earthquakes. In actual use, the shear force near the beam support or in the pier is relatively large under vehicle or earthquake loads. Therefore, the shear strength of the joint interface is one of the important design indicators.

[0004] Existing shear testing devices are limited to a single test and cannot truly simulate the stress environment at the joint interface of precast assembled concrete components.

[0005] Therefore, we propose a test device for the compression-bending-shear stress at the interface of concrete joints. Summary of the Invention

[0006] To address the aforementioned shortcomings of existing technologies, this utility model provides a test device for the compressive-bending-shear stress at the interface of concrete joints.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0008] A testing device for compressive-bending-shear stress at a concrete joint interface is provided for conducting compressive-bending-shear stress tests on a set of specimens. The set of specimens includes an L-shaped first specimen and a rectangular second specimen. The testing device includes: a set of specimens, including an L-shaped first specimen and a rectangular second specimen; a vertical reaction frame, including a bottom support and a top reaction beam; a vertical loading assembly, disposed on the reaction beam, for vertical loading of the second specimen; a horizontal reaction frame, covering the second specimen to ensure that the second specimen is tightly attached to the sidewall of the first specimen; a horizontal loading assembly, disposed within the horizontal reaction frame, for horizontal loading of the first and second specimens; and a sensing module for collecting loading pressure data from the vertical and horizontal loading assemblies, and also for collecting horizontal and vertical relative displacement data between the first and second specimens.

[0009] By setting up vertical and horizontal loading components, the vertical loading component applies a vertical load to the second specimen, and the horizontal loading component applies a horizontal load to the second specimen, thereby realizing the compression-bending-shear stress test at the joint interface of the first and second specimens. The data during the test is collected by the sensing module and used for subsequent test structure calculations, effectively simulating the stress condition at the joint interface of the prefabricated specimen in actual use, and the test results are more accurate.

[0010] Further specifying, the vertical loading component includes a vertical jack and a ball joint. The base of the vertical jack is rotatably connected to the top surface of the second specimen via the ball joint, and the piston end is connected to the bottom surface of the reaction beam via the sensing module. By setting the ball joint to connect the vertical jack and the reaction beam, the environmental conditions of the specimen group in actual use can be simulated more realistically.

[0011] Further defining the horizontal reaction frame, it includes four reaction screws and two reaction plates. The reaction screws are arranged in a rectangular array and are parallel to each other. The two reaction plates are respectively inserted at both ends of the reaction screws and are prevented from exiting the reaction screws by locking nuts.

[0012] Further defined, the inner wall of the reaction plate on one side contacts the side wall of the second specimen, and the inner wall of the reaction plate on the other side contacts the horizontal loading component; the second specimen and the horizontal loading device are fixed by the reaction plates on both sides, so that they can be in stable contact with the first specimen without slipping. The structure is simple and easy to use.

[0013] Further specifying, the horizontal loading component includes a horizontal jack, with the base end of the horizontal jack contacting the side wall of the first specimen and the piston end contacting the reaction plate through a sensing module.

[0014] Further defining the sensor module, it includes a first force sensor, a second force sensor, a vertical displacement gauge, a horizontal displacement gauge, and a strain gauge assembly. The first force sensor is located at the piston end of the vertical jack, and the second force sensor is located at the piston end of the horizontal jack. The two ends of the vertical displacement gauge are respectively located at the bottom end of the second specimen and on the support, and the two ends of the horizontal displacement gauge are respectively located on the first and second specimens. The strain gauge assembly includes horizontal strain gauges, vertical strain gauges, and oblique strain gauges. There are two sets of strain gauges, which are respectively attached to the top of the side wall of the first specimen and the bottom of the side wall of the second specimen. By setting the first force sensor and the second force sensor, the loading pressure data of the vertical jack and the loading pressure data of the horizontal jack are collected. Then, the vertical and horizontal displacement data between the first and second specimens are collected by the vertical and horizontal displacement gauges. The strain gauge assembly collects the shear stress, horizontal stress, and non-axial stress data on the specimen assembly. By combining multiple data, the test results are calculated to more accurately determine the compression-bending-shear stress performance of the joint interface between the first and second specimens.

[0015] Further, load-bearing trolleys are provided between the horizontal jack and the support, and between the side wall of the second specimen and the reaction plate. By setting load-bearing trolleys, the horizontal jack can be installed conveniently, and the friction between the reaction plate and the second specimen can be reduced, thus reducing the impact on the test.

[0016] Furthermore, an anti-overturning block is provided between the reaction beam and the top surface of the first specimen; by setting the anti-overturning block to press down the first specimen, the stability of the device can be improved and the overturning of the first specimen can be prevented.

[0017] The beneficial effects of this utility model are as follows: by setting up a vertical loading component, a horizontal loading component and a sensing module, it can effectively simulate the stress situation of the joint interface of concrete in actual use, and can more accurately test the stress capacity of the concrete joint interface. The structure is simple and easy to use. Attached Figure Description

[0018] Figure 1 This is a front view of the present invention;

[0019] Figure 2 This is the rear view of the specimen group.

[0020] The symbols for each component are as follows:

[0021] Specimen group 1, first specimen 11, second specimen 12, vertical reaction frame 2, support 21, reaction beam 22, vertical loading assembly 3, vertical jack 31, ball joint 32, horizontal reaction frame 4, reaction screw 41, reaction plate 42, horizontal loading assembly 5, sensing module 6, first force sensor 61, second force sensor 62, vertical displacement meter 63, horizontal displacement meter 64, strain gauge group 65, load-bearing trolley 7. Detailed Implementation

[0022] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.

[0023] Example:

[0024] like Figure 1 and Figure 2As shown, a concrete joint interface compression-bending-shear stress testing device is used to conduct compression-bending-shear stress tests on specimen group 1. Specimen group 1 includes an L-shaped first specimen 11 and a rectangular second specimen 12. The testing device includes a vertical reaction frame 2, a vertical loading assembly 3, a horizontal reaction frame 4, a horizontal loading assembly 5, and a sensing module 6. The vertical reaction frame 2 includes a bottom support 21 and a top reaction beam 22. An anti-overturning block is also provided between the reaction beam 22 and the top surface of the first specimen 11. The vertical loading assembly 3 is located on the reaction beam 22 and applies vertical loading to the second specimen 12. The vertical loading assembly 3 includes a vertical jack 3. The base of the vertical jack 31 is rotatably connected to the top surface of the second specimen 12 via the ball joint 32, and the piston end is connected to the bottom surface of the reaction beam 22 via the sensing module 6; the horizontal reaction frame 4 covers the second specimen 12 and is used to make the second specimen 12 fit tightly against the side wall of the first specimen 11; the horizontal reaction frame 4 includes four reaction screws 41 and two reaction plates 42. The reaction screws 41 are arranged in a rectangular array and are parallel to each other. The two reaction plates 42 are respectively inserted at both ends of the reaction screws 41 and are prevented from exiting the reaction screws 41 by locking nuts; the reaction plate on one side The inner wall of the reaction plate 42 contacts the side wall of the second specimen 12, and the inner wall of the reaction plate 42 on the other side contacts the horizontal loading assembly 5; the horizontal loading assembly 5 is used to load the first specimen 11 and the second specimen 12 in the horizontal direction; the horizontal loading assembly 5 includes a horizontal jack, the base end of the horizontal jack contacts the side wall of the first specimen 11, and the piston end contacts the reaction plate 42 through the sensing module 6; a load-bearing trolley 7 is provided between the horizontal jack and the support 21, and between the side wall of the second specimen 12 and the reaction plate 42; the sensing module 6 includes a first force sensor 61, a second force sensor 62, a vertical displacement meter 63, and a horizontal displacement meter 64. The displacement gauge 64 and strain gauge group 65 are provided. The first force sensor 61 is located at the piston end of the vertical jack 31, and the second force sensor 62 is located at the piston end of the horizontal jack. The two ends of the vertical displacement gauge 63 are respectively located at the bottom end of the second specimen 12 and the support 21. The two ends of the horizontal displacement gauge 64 are respectively located on the first specimen 11 and the second specimen 12. The strain gauge group 65 includes horizontal strain gauges, vertical strain gauges and oblique strain gauges. The strain gauge group 65 is provided in two sets, which are respectively attached to the top of the side wall of the first specimen 11 and the bottom of the side wall of the second specimen 12. The strain gauge group is attached to the back of the first specimen 11 and the second specimen 12.

[0025] By setting up a vertical loading component 3 and a horizontal loading component 5, the vertical loading component 3 applies a vertical load to the second specimen 12, and the horizontal loading component 5 applies a horizontal load to the second specimen 12, thereby realizing the compression-bending-shear stress test at the joint interface of the first specimen 11 and the second specimen 12. The data during the test is collected by the sensing module 6 and used for subsequent test structure calculations, effectively simulating the stress condition at the joint interface of the prefabricated specimen in actual use, and the test results are more accurate. By setting up a ball joint 32 to connect the vertical jack 31 and the reaction beam 22, the environmental conditions of the specimen group 1 in actual use can be simulated more realistically. The second specimen 12 and the horizontal loading device are fixed by the reaction plates 42 on both sides, so that they can be stably contacted with the first specimen 11 without slipping. The structure is simple and easy to use. By setting up a first force sensor 6 The first and second force sensors 62 collect data on the loading pressure of the vertical jack 31 and the horizontal jack. The vertical displacement gauge 63 and the horizontal displacement gauge 64 collect data on the vertical and horizontal relative displacement between the first specimen 11 and the second specimen 12. The strain gauge group 65 collects data on the shear stress, horizontal stress and non-axial stress on the specimen group 1. The combination of multiple data to calculate the test results can more accurately determine the bending and shear stress performance of the joint interface between the first specimen 11 and the second specimen 12. The load-bearing trolley 7 facilitates the installation of the horizontal jack and reduces the friction between the reaction plate 42 and the second specimen 12, thus reducing the impact on the test. The anti-overturning block presses down on the first specimen 11, which can improve the stability of the device and prevent the first specimen 11 from overturning.

Claims

1. A test apparatus for testing the compressive-bending-shear stress at a concrete joint interface, used to conduct compressive-bending-shear stress tests on a set of specimens (1), wherein the set of specimens (1) comprises an L-shaped first specimen (11) and a rectangular second specimen (12); characterized in that, The test apparatus includes: The vertical reaction frame (2) includes a bottom support (21) and a top reaction beam (22); A vertical loading component (3) is mounted on the reaction beam (22) to apply vertical loading to the second specimen (12); A horizontal reaction frame (4) is wrapped around the second specimen (12) to make the second specimen (12) fit tightly against the side wall of the first specimen (11); A horizontal loading component (5) is provided inside the horizontal reaction frame (4) to load the first specimen (11) and the second specimen (12) in the horizontal direction; The sensing module (6) is used to collect the loading pressure data of the vertical loading component (3) and the horizontal loading component (5). The sensing module (6) is also used to collect the horizontal and vertical relative displacement data between the first specimen (11) and the second specimen (12). The sensing module (6) is also used to collect the horizontal stress, shear stress and non-axial stress data on the first specimen (11) and the second specimen (12).

2. The concrete joint interface compression-bending-shear stress testing device according to claim 1, characterized in that, The vertical loading component (3) includes a vertical jack (31) and a ball joint (32). The base of the vertical jack (31) is rotatably connected to the top surface of the second specimen (12) through the ball joint (32), and the piston end is connected to the bottom surface of the sensing module (6) and the reaction beam (22).

3. The concrete joint interface compression-bending-shear stress testing device according to claim 2, characterized in that, The horizontal reaction frame (4) includes four reaction screws (41) and two reaction plates (42). The reaction screws (41) are arranged in a rectangular array and the four reaction screws (41) are parallel to each other. The two reaction plates (42) are respectively inserted through the two ends of the reaction screws (41) and the reaction plates (42) are prevented from exiting the reaction screws (41) by locking nuts.

4. The concrete joint interface compression-bending-shear stress testing device according to claim 3, characterized in that, The inner wall of the reaction plate (42) on one side is in contact with the side wall of the second specimen (12), and the inner wall of the reaction plate (42) on the other side is in contact with the horizontal loading assembly (5).

5. The concrete joint interface compression-bending-shear stress testing device according to claim 4, characterized in that, The horizontal loading assembly (5) includes a horizontal jack, the base end of which contacts the side wall of the first specimen (11), and the piston end which contacts the sensor module (6) and the reaction plate (42).

6. The concrete joint interface compression-bending-shear stress testing device according to claim 5, characterized in that, The sensing module (6) includes a first force sensor (61), a second force sensor (62), a vertical displacement gauge (63), a horizontal displacement gauge (64), and a strain gauge group (65). The first force sensor (61) is located at the piston end of the vertical jack (31), and the second force sensor (62) is located at the piston end of the horizontal jack. The two ends of the vertical displacement gauge (63) are respectively located at the bottom end of the second specimen (12) and the support (21). The two ends of the horizontal displacement gauge (64) are respectively located on the first specimen (11) and the second specimen (12). The strain gauge group (65) includes a horizontal strain gauge, a vertical strain gauge, and an oblique strain gauge. The strain gauge group (65) has two sets, which are respectively attached to the top of the side wall of the first specimen (11) and the bottom of the side wall of the second specimen (12).

7. The concrete joint interface compression-bending-shear stress testing device according to claim 6, characterized in that, A load-bearing trolley (7) is provided between the horizontal jack and the support (21), between the side wall of the second specimen (12) and the reaction plate (42).

8. The concrete joint interface compression-bending-shear stress testing device according to claim 7, characterized in that, An anti-overturning block is also provided between the reaction beam (22) and the top surface of the first specimen (11).

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