CN111650035A - A test device capable of vertical bending loading - Google Patents

Abstract

The invention discloses a loading device, comprising four parts: a loading beam, an upper hoop, a lower hoop and an anchoring support. The device can perform monotonic and reciprocating bending tests on cylindrical specimens such as socket-type ductile iron pipes, steel pipes, and concrete-filled steel tubular columns. The upper part of the loading beam is connected to the vertical actuator, and the lower part is connected to the upper hoop, which can provide vertical loading. The anchoring support is connected with the ground through the ground anchor hole, and the upper part thereof is connected with the lower hoop. The upper hoop and the lower hoop fasten the loaded specimen at the same time, and the gap between the hoop and the pipe is filled with a rubber pad to ensure the stability of the fixation. The hoop can be designed according to the size of the loaded specimen to meet the loading of specimens with different diameters. For loading specimens with a smaller diameter difference from the hoop, thick rubber pads can be used for filling to achieve the same purpose. The loading device is easy to install and has strong functionality. The double hoop design provides hinge support for both ends of the specimen to ensure rotation during the loading process. At the same time, this design can also fully apply the displacement generated by the actuator to on the specimen to be loaded.

Description

A test device capable of vertical bending loading

technical field

The invention belongs to a test loading device for geotechnical and structural engineering, and more specifically, to a vertical bending loading device for cylindrical specimens such as pipes and concrete-filled steel tubular columns.

Background technique

Buried pipeline systems are usually used to transport materials such as drinking water, sewage, oil, and natural gas. Because these materials play an important role in the maintenance of human life and property, buried pipeline projects are vividly called "lifeline projects". The lifeline project is an important infrastructure of a modern city. With the continuous improvement of China's comprehensive national strength, the planning, management and environmental governance of domestic cities have also become the hot spots of urban construction and management in my country. Water supply pipelines are an important part of urban lifeline system engineering. It is also the main content of urban construction. Previous earthquake disaster investigations and studies have shown that the tension and compression damage of the nodes of buried pipelines under the action of earthquakes is particularly significant: the filling material of socket-type pipeline nodes is loose, resulting in pipeline leakage; plugs are pulled out or sockets are ruptured under pressure; buried After the strong earthquake, the underground pipeline suffered great damage and destruction, and even lost its function completely, which caused a series of secondary disasters such as fire, explosion, power outage, water outage, chemical gas leakage, etc., which seriously affected the post-earthquake repair work in the city. Therefore, in order to reduce the loss of life and property caused by earthquakes, monotonic and reciprocating bending tests of socket-type pipe joints or steel pipe pipes to obtain their mechanical properties will help us to strengthen the safety design of pipes.

CFST columns are widely used because of their high bearing capacity, good ductility, superior seismic performance, convenient construction, which greatly shortens the construction period, is conducive to the fire resistance and fire resistance of steel pipes, and has better corrosion resistance than steel structures. It is well known that concrete has high compressive strength. However, the bending resistance is very weak, while the steel, especially the section steel, has strong bending resistance and good elasticity and plasticity, but it is easy to become unstable when under compression and lose its axial compressive ability. The CFST structure can combine the advantages of the two, so that the concrete can be in a state of lateral compression, and its compressive strength can be doubled. At the same time, due to the existence of concrete, the rigidity of the steel pipe is improved, and the two work together to greatly improve the bearing capacity. The research on the relevant characteristics of CFST is also being carried out one after another. The device can carry out the loading test of vertical monotonicity and reciprocating bending of CFST columns, which provides a reference for the design of CFST.

In addition, the loading device can also load scaled models, such as scaled tunnel models.

SUMMARY OF THE INVENTION

In view of the above existing requirements, the purpose of the present invention is to provide a device for vertical monotonic and reciprocating bending loading for cylindrical specimens, which is easy to install, has a wide application range and has relatively complete functions.

The present invention provides a device for vertical monotonic and reciprocating bending loading for cylindrical specimens, which is characterized by comprising: a loading beam (A), an upper hoop (B), a lower hoop (C) and an anchoring support seat (D); the loading beam (A) and the upper hoop (B) are connected by the second bolt (2), the upper hoop (B) and the lower hoop (C) are connected with the loading specimen at the same time, and the lower hoop The hoop (C) and the anchoring support (D) are connected by the second bolt (2), and the anchoring support (D) is connected with the ground through the anchor bolts provided by the laboratory.

The upper part of the loading beam (A) is provided with a connecting plate (3) connected to the vertical actuator, the middle part of the loading beam (A) is a rectangular steel pipe (4), and the lower ends of the loading beam (A) are welded with first single ears (5). ) to connect with the upper hoop (B); the connecting plate (3) and the rectangular steel pipe (4) are connected by welding;

The upper hoop (B) includes three parts: the first double ears (6), the upper part of the upper hoop (7) and the lower part of the upper hoop (8). Two bolts (2) are connected, the upper part (7) of the upper hoop and the lower part (8) of the upper hoop are connected by the first bolt (1); the first double ears (6) and the upper part (7) of the upper hoop are welded by welding to connect.

The lower hoop (C) includes three parts: the second single ear (9), the lower part of the lower hoop (10) and the upper part of the lower hoop (11); the second single ear (9) is connected to the anchoring support (D), and the lower The lower part (10) of the hoop and the upper part (11) of the lower hoop are connected by a first bolt (1); the second single ear (9) and the lower part (10) of the lower hoop are connected by welding.

The anchoring support (D) comprises four parts welded by the second double ear (13), the top plate (14), the support plate (15) and the bottom plate (16); the second double ear (13) and the second single ear (9) The connection is made by the second bolt (2), and the size of the ground anchor hole (17) on the bottom plate (16) is designed according to the laboratory site; the second double ears (13), the top plate (14), the support plate (15), the bottom plate ( 16) Welding is used to connect them.

Compared with the prior art, the present invention has the following remarkable features:

1. The loading device adopts the design of double hoop. During the loading process, the lower hoop can act as a hinge support, and the upper hoop can completely transmit the displacement of the actuator to the loading specimen, and can perform monotonic and reciprocating loading. test.

2. The loading device can carry out the loading test of ductile iron pipes, steel pipes, and concrete-filled steel tubular columns and cylinders, and has a wide range of applications.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the accompanying drawings required in the description of the embodiments will be briefly introduced below. The accompanying drawings are only the embodiments of the present invention. On the premise that other drawings can also be obtained from these drawings:

FIG. 1 is a three-dimensional view of a test device capable of vertical bending loading according to the present invention.

FIG. 2 is a three-dimensional view of a loading beam of a test device capable of vertical bending loading according to the present invention.

FIG. 3 is a three-dimensional view of an upper hoop of a test device capable of vertical bending loading according to the present invention.

FIG. 4 is a three-dimensional view of a lower hoop of a test device capable of vertical bending loading according to the present invention.

FIG. 5 is a three-dimensional view of a rubber pad of a test device capable of vertical bending loading according to the present invention.

6 is a three-dimensional view of a support of a test device capable of vertical bending loading according to the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to disclose the present invention, not for The invention is limited.

The present invention details a test device capable of vertical bending loading. As shown in Figure 1, the bracket includes: a loading beam (A), an upper hoop (B), a lower hoop (C) and an anchoring support (D). The installation steps are as follows:

The loading beam (A) is connected to the actuator by bolts provided by the laboratory;

The upper part (7) of the upper hoop is connected with the loading beam (A) by the second bolt (2), and the loading specimen is hoisted by a laboratory device. The second bolt (2) connects the upper part (7) of the upper hoop and the lower part (8) of the upper hoop, and uses a rubber pad (12) to fill the gap between the upper hoop (B) and the loading specimen (E), for better fixation;

The anchoring support (D) is fixed to the ground through the ground anchor hole (17) and the anchor bolt provided by the laboratory;

The single ear (9) of the lower part (10) of the lower hoop and the double ear (13) of the anchoring support (D) are connected by the second bolt (2);

Hoist the spliced loading beam (A), upper hoop (B), and loading specimen (E) as a whole, place them on the lower part of the lower hoop (10), install the upper part of the lower hoop (11), and use the first bolt (1) ) Connect the lower part (10) of the lower hoop and the upper part (11) of the lower hoop, and also use the rubber pad (12) to fill the gap between the upper hoop (B) and the loading specimen (E) to achieve better fixed effect.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that are not conceived without creative work shall fall within the protection scope of the present invention.

Claims (7)

1. A test device capable of vertical bending loading is characterized by comprising: the device comprises a loading cross beam (A), an upper hoop (B), a lower hoop (C) and an anchoring support (D); the loading cross beam (A) is connected with the upper hoop (B) through a second bolt (2), the upper hoop (B) and the lower hoop (C) are simultaneously connected with a loading test piece, the lower hoop (C) is connected with the anchoring support (D) through the second bolt (2), and the anchoring support (D) is connected with the ground through an anchor bolt provided by a laboratory;

a connecting plate (3) connected with the vertical actuator is arranged at the upper part of the loading cross beam (A), a rectangular steel pipe (4) is arranged in the middle of the loading cross beam (A), and first lugs (5) are welded at two ends of the lower part of the loading cross beam (A) to be connected with an upper hoop (B); the connecting plate (3) is connected with the rectangular steel pipe (4) by welding;

the upper hoop (B) comprises three parts, namely a first double lug (6), an upper hoop upper part (7) and an upper hoop lower part (8), the first double lug (6) is connected with the first single lug (5) through a second bolt (2), and the upper hoop upper part (7) is connected with the upper hoop lower part (8) through a first bolt (1); the first double lugs (6) are connected with the upper part (7) of the upper hoop by welding;

the lower hoop (C) comprises a second single lug (9), a lower hoop part (10) and an upper hoop part (11); the second single lug (9) is connected with the anchoring support (D), and the lower hoop part (10) is connected with the upper hoop part (11) through a first bolt (1); the second single lug (9) is connected with the lower part (10) of the lower hoop by welding;

the anchoring support (D) comprises a second double lug (13), a top plate (14), a support plate (15) and a bottom plate (16) which are welded together; the second double lugs (13) are connected with the second single lug (9) through second bolts (2), and the size of a ground anchor hole (17) in the bottom plate (16) is designed according to a laboratory site; the second double lugs (13), the top plate (14), the supporting plate (15) and the bottom plate (16) are connected by welding.

2. The test device capable of vertical bending loading according to claim 1, wherein the upper anchor ear (B) and the lower anchor ear (C) form a double anchor ear, and the double anchor ear is designed to provide a hinged support for loading the test piece (E) so as to realize monotonous and reciprocating loading.

3. A test device capable of vertical bending loading according to claim 1, characterized in that the upper part of the loading beam (a) is provided with a connecting plate (3), and the connecting plate (3) is connected with the vertical actuator through a bolt.

4. The test device capable of vertical bending loading according to claim 1, wherein the upper anchor ear (B) and the lower anchor ear (C) are designed and processed according to the actual diameter of the loading test piece (E).

5. The test device capable of vertical bending loading according to claim 1, wherein the gaps between the upper hoop (B) and the loading test piece (E) and between the lower hoop (C) and the loading test piece (E) are filled by rubber pads (12).

6. The test device capable of vertical bending loading according to claim 1, wherein the loading device is used for loading a cylindrical test piece of a nodular cast iron pipe, a steel pipe and a steel pipe concrete column.

7. The test device capable of vertical bending loading according to claim 1, wherein the rigid bottom plate (16) is made of a steel plate with the thickness of 30mm and is fixed on the bottom surface of the experimental site through an earth anchor bolt.

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