Locking and limiting test system capable of adjusting supporting point position and rigidity

Abstract

The invention discloses a locking and limiting test system capable of adjusting a supporting point position and rigidity. Relates to the technical field of bridge model tests. The splicing stand columns are connected with the counter-force bottom plate through ground anchor bolts, the ground anchor bolts are arranged in the ground anchor holes in a penetrating mode, and a plurality of bolt connecting holes are formed in the splicing stand columns in the height direction at intervals. A plurality of connecting cross beams are arranged at intervals in the height direction of the splicing stand columns, and the two ends of the connecting cross beams are connected with the splicing stand columns through fastening bolts; the supporting base comprises a force transmission grid box, a limiting grid plate and sliding fluorine plates, the force transmission grid box is arranged on the splicing stand columns, the limiting grid plate is arranged on the force transmission grid box, the sliding fluorine plates are arranged at the ends, away from the force transmission grid box, of the limiting grid plate, and the test body is arranged between the two sliding fluorine plates. According to the locking and limiting test system with the adjustable supporting point position and rigidity, assembled components are adopted for assembly, and the locking and limiting test system is suitable for test bodies with different height supporting points, different supporting rigidities and different section heights and widths.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge model testing, and more particularly to a locking limit testing system with adjustable support point positions and stiffness. Background Art

[0002] Arch bridges, with their unmatched rigidity advantages over other bridge types, hold a crucial position in the construction of strategic transportation networks. Their ease of construction, high structural rigidity, and economical efficiency have rapidly made them the most competitive long-span bridge type in my country. However, the expansion of spans exacerbates the impact of numerous unfavorable factors during construction, such as nonlinear effects and the coupling of environmental and load conditions. This significantly increases the difficulty of designing, constructing, and controlling long-span arch bridges.

[0003] Model testing is favored by research institutions and universities because it allows for pre-construction rehearsals, simulates the mechanical properties of actual bridge structures, predicts actual structural responses, ensures bridge structural safety, and promotes innovation in bridge technology and theory. For example, Southwest Jiaotong University conducted full-bridge scaled model tests on the 410-meter-span Wanxian Yangtze River Bridge and the 445-meter-span Beipanjiang Bridge on the Shanghai-Kunming High-Speed ​​Railway, ensuring the high-quality completion of the arch bridge structures. Chongqing Jiaotong University is currently conducting full-bridge scaled model tests at a 1:10 scale on the 600-meter-span Tian'e Longtan Bridge, the world's longest arch bridge, and is developing a comprehensive arch bridge testing platform.

[0004] Currently, research institutions and universities lack the limited-position test equipment required for model testing. However, large-scale full-bridge scale model testing is technically difficult, carries significant risks and costs, and test failure can result in significant economic losses and even safety incidents, effectively forcing success to the limit.

[0005] During the construction and testing of existing test models, the lateral stability of the structure is poor. To limit the lateral displacement of the structure, the traditional approach is to tension cables on the test body. However, this method can only prevent the structure from overturning and cannot constrain small deformations of the test body. In addition, the cable force is a single-point concentrated force, which is not conducive to the stress on the test body.

[0006] Therefore, how to provide an auxiliary device that can solve the source of test risks, ensure the smooth progress of the test, and have an adjustable support point and stiffness locking limit test system that is simple to assemble and can be reused, reducing costs and saving time is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0007] In view of this, the present invention provides a locking limit test system with adjustable support points and stiffness, which aims to solve one of the problems in the above-mentioned background technology. It is an auxiliary device that can solve the source of test risks, ensure the smooth progress of the test, and is simple to assemble and can be reused, reducing costs and saving time.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A locking limit test system with adjustable support point and stiffness, comprising:

[0010] A reaction base plate, wherein the reaction base plate is provided with ground anchor holes;

[0011] Splicing columns, wherein two splicing columns are arranged opposite to each other, and the two splicing columns are connected to the reaction base plate through anchor bolts, the anchor bolts are inserted into the anchor holes, and a reinforcing column foot is provided at the bottom of the splicing column, and a plurality of bolt connection holes are provided at intervals along the height direction of the splicing column;

[0012] Connecting beams, wherein a plurality of connecting beams are arranged at intervals along the height direction of the splicing columns, and each of the connecting beams is located between two splicing columns. Both ends of the connecting beams are connected to the splicing columns by fastening bolts. By adjusting the number of connecting beams and the position of the connecting beams in the height direction of the columns, different support stiffnesses can be achieved;

[0013] A support base is provided, wherein the support base is located above the connecting beam, and the support base includes a force transmission grid box, a limiting grid plate and a sliding fluorine plate. The force transmission grid boxes are relatively arranged on two of the splicing columns, the limiting grid plate is arranged at one end of the force transmission grid box away from the splicing columns, and the sliding fluorine plate is arranged at one end of the limiting grid plate away from the force transmission grid box, and the test body is arranged between the two sliding fluorine plates.

[0014] Furthermore, each of the spliced ​​columns includes a bottom segment and a standard segment, the bottom segment is connected to the reaction base plate through ground anchor bolts, an end plate is arranged between the bottom segment and the standard segment, a stiffening column foot is arranged at the bottom of the bottom segment, and a plurality of bolt connection holes are arranged at intervals along the height direction in the standard segment of the spliced ​​column.

[0015] Furthermore, the force transmission grid is fixed to the standard segment by the fastening bolts.

[0016] Furthermore, a tight-fitting plug pad is provided at one end of the ground anchor bolt away from the bottom segment, and the tight-fitting plug pad is used to fix the ground anchor bolt and the ground anchor hole.

[0017] Furthermore, the connecting beam is composed of a top plate, a bottom plate and a web plate. The ends of the top plate and the bottom plate are provided with rounded corners to optimize the stress of the components, and the ends of the web plate are provided with holes that match the bolt connection holes.

[0018] Furthermore, the limiting grid plate and the sliding fluorine plate are arranged at one end of the force transmission grid box away from the splicing column through an adjusting screw.

[0019] Furthermore, the plurality of bolt connection holes are spaced 20 cm apart in the vertical direction.

[0020] Furthermore, the force transmission grid is connected to the standard segment of the splicing column by fastening bolts.

[0021] Through the above technical solutions, it can be known that compared with the prior art, the present invention discloses a locking limit test system with adjustable support points and stiffness. By setting bolt connection holes on the spliced ​​columns, it can be detachably connected by tightening bolts. For different model tests, according to the actual required limit height, the standard sections of the spliced ​​columns can be first extended and adjusted to the required height. Then, the vertical height of the support base on the spliced ​​columns can be adjusted to constrain the test subject; by adjusting the constraint length of the screw, the test subject and the limit grid plate and the sliding fluorine plate can be closely matched, and the force transmission is reliable. At the same time, it can also be applied to test subjects with different cross-sectional widths; by adjusting the height of the connecting beam, it can be used as a temporary or permanent support for the test subject to ensure the safety of the structure; by adjusting the number of connecting beams and the position of the connecting beams in the height direction of the column, different support stiffnesses can be achieved; the surface-to-surface contact force transmission between the sliding fluorine plate and the test subject can ensure that the structure is subjected to reasonable force and deforms freely;

[0022] The use of assembled components allows for testing entities with varying support heights, cross-sectional heights, and widths. For arch bridge models, the span, rise, and cross-sectional area are all adjustable, making it suitable for almost all arch bridge model tests. Simultaneously, the force applied to the limiter and test entity is reasonable, ensuring smooth testing and overall structural safety. This system offers the advantages of simple assembly, stable structure, safe force distribution, economical and environmentally friendly operation, and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0024] Figure 1 A structural assembly diagram of the locking limit test system with adjustable support point and stiffness provided by the present invention;

[0025] Figure 2 An elevational layout diagram of the support base provided by the present invention;

[0026] Figure 3 A plan view of the support base provided by the present invention;

[0027] Figure 4 Detailed drawing of the anchoring arrangement at the column head provided by the present invention;

[0028] Figure 5 A design drawing of a tight-fitting plug gasket provided by the present invention;

[0029] Figure 6 A schematic structural diagram of the force transmission grid provided by the present invention;

[0030] Figure 7 A schematic structural diagram of the space limiting grid provided by the present invention;

[0031] Figure 8 A side view of the locking limit test system with adjustable support point and stiffness provided by the present invention;

[0032] Figure 9 A structural diagram of the three-dimensional refined model provided by the present invention;

[0033] Figure 10 This is a diagram of the calculation results provided by the present invention.

[0034] Among them: 1 is the splicing column; 2 is the anchor bolt; 3 is the tight-fitting pad; 4 is the connecting beam; 5 is the fastening bolt; 6 is the supporting base; 7 is the force transmission box; 8 is the adjusting screw; 9 is the limit grid; 10 is the sliding fluorine plate; 11 is the reaction bottom plate; 12 is the test body. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-10 The embodiment of the present invention discloses a locking limit test system with adjustable support point and stiffness, comprising:

[0037] A reaction base plate 11, wherein the reaction base plate 11 is provided with ground anchor holes;

[0038] Splicing columns 1, two splicing columns 1 are arranged opposite to each other, and the two splicing columns 1 are connected to the reaction base plate 11 through ground anchor bolts 2, and the ground anchor bolts 2 are inserted into the ground anchor holes. A reinforcing column foot is provided at the bottom of the splicing column 1, and a plurality of bolt connection holes are provided at intervals along the height direction of the splicing column 1; the splicing column 1 is used to transmit the limit support reaction force along the height direction and is the main load-bearing component; by providing the reinforcing column foot, it is ensured that the component is subjected to reasonable force; the ground anchor bolts 2 are used to connect the reaction base plate 11 and the splicing column 1, and transmit the column force to the reaction base plate 11;

[0039] Connecting beams 4, multiple connecting beams 4 are arranged at intervals along the height direction of the splicing columns 1, and multiple connecting beams 4 are located between two splicing columns 1. The two ends of the connecting beams 4 are connected to the splicing columns 1 by fastening bolts 5; the connecting beams 4 are used to connect the columns to form a portal frame, thereby increasing the overall deformation stiffness of the structure. At the same time, they can serve as temporary support for the test body 12 and vertical support for the test body 12 during the destructive test, thereby improving the safety of the test;

[0040] The support base 6 is located above the connecting beam 4. The support base 6 includes a force transmission grid box 7, a limit grid plate 9 and a sliding fluorine plate 10. The force transmission grid box 7 is relatively arranged on two splicing columns 1. The limit grid plate 9 is arranged at the end of the force transmission grid box 7 away from the splicing column 1. The sliding fluorine plate 10 is arranged at the end of the limit grid plate 9 away from the force transmission grid box 7. The test body 12 is arranged between the two sliding fluorine plates 10; the support base 6 is used to limit and constrain the lateral displacement of the test body 12 and transmit the lateral force to the column. The vertical length of the support base 6 is set to be greater than the vertical length of the test body 12, which can ensure After vertical deformation, the test body 12 is still in full contact with the support base 6, and the force is reasonable. It can also be applied to test bodies 12 with different cross-sectional heights; the force transmission grid box 7 is the main force-bearing component of the support base 6. The force transmission grid box 7 adopts the layout of a steel plate grid box, which is used to connect the support column and the limit grid plate 9, and a drilled steel plate is set on the connection side of the limit grid plate 9; the adjusting screw 8 is used to connect the force transmission grid box 7 and the limit grid plate 9 to transmit the lateral force constraining the test body 12 to the force transmission grid box 7; the sliding fluorine plate 10 is used to directly transmit force in surface contact with the test body 12 to prevent excessive local force from damaging the test body 12.

[0041] In this embodiment, each spliced ​​column 1 includes a bottom segment and a standard segment. The bottom segment is connected to the reaction base plate 11 through a ground anchor bolt 2. An end plate is arranged between the bottom segment and the standard segment. A stiffening column foot is arranged at the bottom of the bottom segment. The standard segment of the spliced ​​column 1 is provided with a plurality of bolt connection holes spaced apart along the height direction; the end plate arranged between the bottom segment and the standard segment is connected by bolts to meet the requirements on the height of the test limit point; holes matching the ground anchor holes are arranged on the bottom plate of the bottom segment.

[0042] In this embodiment, the force transmission grid 7 is fixed to the standard segment by fastening bolts 5; the fastening bolts 5 are used to connect the columns 1, the connecting beams 4, and the support base 6, and the fastening bolts 5 are 10.9 grade M32 high-strength bolts.

[0043] In this embodiment, a tight-fitting plug washer is provided at one end of the ground anchor bolt 2 away from the bottom segment, and the tight-fitting plug washer is used to fix the ground anchor bolt 2 and the ground anchor hole; the tight-fitting plug washer is made of A3 steel and is provided with a 2 mm deformation through-slit.

[0044] In this embodiment, the connecting beam 4 is composed of a plate top, a bottom plate and a web. The ends of the plate top and the bottom plate are provided with rounded corners to optimize the stress of the components, and the ends of the web are provided with holes that match the bolt connection holes. The connecting beam 4 can be set in different numbers according to the height of the standard segment extended by the spliced ​​column 1. After calculation and analysis, it is appropriate to arrange 3 beams for a 15m frame, 2 beams for a 13m frame, and 1 beam for a 9m frame, and the beams are all arranged in the center.

[0045] In this embodiment, the limiting grid plate 9 and the sliding fluorine plate 10 are arranged at the end of the force transmission grid box 7 away from the splicing column 1 through the adjusting screw 8; the constraint length of the adjusting screw 8 is adjustable, which can ensure that the test body 12 and the supporting base 6 serving as a limiting device are closely matched and the force transmission is reliable; the limiting grid plate 9 is used to fix the sliding fluorine plate 10, which adopts the layout form of a drilled steel grating and is supported by the adjusting screw 8.

[0046] In this embodiment, the plurality of bolt connection holes are spaced 20 cm apart in the vertical direction.

[0047] In this embodiment, the force transmission grid 7 is connected to the standard segment of the spliced ​​column 1 by fastening bolts 5 .

[0048] In addition, in this embodiment, the ground anchor bolt 2 is made of 40cr material and is heat-treated, so that the yield strength can reach above 800 MPa and the ultimate tensile strength can reach above 1000 MPa.

[0049] The sliding fluorine plate 10 is made of polytetrafluoroethylene, which has excellent properties such as high lubricity, high and low temperature resistance, corrosion resistance, non-adhesion, and non-toxicity. The test body 12 droops after loading. The high lubricity of the sliding fluorine plate 10 can reduce the drooping resistance, allowing the test body 12 to droop freely. At the same time, it can also ensure the safety of the sliding fluorine plate 10's own force and prevent it from falling off due to friction.

[0050] Specific steps:

[0051] S1: During the test, first determine the placement of the support base 6 that matches the anchor hole of the reaction base plate 11. Then, according to the actual required limit height, splice the column 1 to extend the standard segment and adjust it to the required height. Then, align the hole of the bottom segment with the anchor hole of the reaction base plate 11, insert the anchor bolt 2 and the tight-fitting plug gasket to tightly connect the bottom of the spliced ​​column 1 and the reaction base plate 11;

[0052] S2: Determine the height position of the connecting beam 4 according to the height of the test body 12, and use the fastening bolts 5 to fix the connecting beam 4 to the splicing column 1 through the column bolt connection hole. The number of connecting beams 4 installed is determined according to the height of the splicing column 1;

[0053] S3: Install the support base 6. First, fix the sliding fluorine plate 10 on the limit grid plate 9 to connect them. Then weld the adjustment bolts to the limit grid plate 9 to form a whole. Finally, let the adjustment bolts pass through the holes left in the force transmission box 7 and temporarily fix the position with nuts to form the overall structure of the support base 6.

[0054] S4: Determine the installation height of the support base 6 on the splicing column 1 according to the height of the limit point, and connect the support base 6 to the splicing column 1 by fastening the bolts 5;

[0055] S5: While installing the support base 6 on the splicing column 1, adjust the lateral position of the sliding fluorine plate 10 according to the test body 12 in place to ensure that the sliding fluorine plate 10 is in close contact with the surface of the test body 12; the specific operation is to adjust the constraint length of the adjustment bolt by loosening the nuts at both ends of the adjustment bolt;

[0056] S6: According to the finite element calculation results, in this specific embodiment, when the heights of the spliced ​​columns 1 are 15m, 12m, and 9m, respectively, their lateral stiffnesses are 0.8t / mm, 0.67t / mm, and 1t / mm, respectively, and their ultimate bearing capacities are 89.3t, 72.3t, and 67.4t, respectively;

[0057] S7: After one test is completed, dismantle the components of the limit device and adjust the support point height, support height and support width to adapt to subsequent arch bridge tests with different spans.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0059] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A locking limit test system with adjustable support point and stiffness, characterized in that: include: A reaction base plate, wherein the reaction base plate is provided with ground anchor holes; Splicing columns, wherein two splicing columns are arranged opposite to each other, and the two splicing columns are connected to the reaction base plate through anchor bolts, the anchor bolts are inserted into the anchor holes, and a reinforcing column foot is provided at the bottom of the splicing column, and a plurality of bolt connection holes are provided at intervals along the height direction of the splicing column; Connecting beams, wherein a plurality of connecting beams are arranged at intervals along the height direction of the splicing columns, and each of the connecting beams is located between two splicing columns. Both ends of the connecting beams are connected to the splicing columns by fastening bolts. By adjusting the number of connecting beams and the position of the connecting beams in the height direction of the columns, different support stiffnesses can be achieved; A support base is provided, wherein the support base is located above the connecting beam, and the support base includes a force transmission grid box, a limiting grid plate and a sliding fluorine plate. The force transmission grid boxes are relatively arranged on two of the splicing columns, the limiting grid plate is arranged at one end of the force transmission grid box away from the splicing columns, and the sliding fluorine plate is arranged at one end of the limiting grid plate away from the force transmission grid box, and the test body is arranged between the two sliding fluorine plates.

2. A locking limit test system with adjustable support point and stiffness according to claim 1, characterized in that: Each of the spliced ​​columns includes a bottom segment and a standard segment. The bottom segment is connected to the reaction base plate through anchor bolts. An end plate is arranged between the bottom segment and the standard segment. A stiffening column foot is arranged at the bottom of the bottom segment. The standard segment of the spliced ​​column is provided with a plurality of bolt connection holes spaced apart along the height direction.

3. A locking limit test system with adjustable support point and stiffness according to claim 2, characterized in that: The force transmission grid is fixed to the standard segment by the fastening bolts.

4. A locking limit test system with adjustable support point and stiffness according to claim 1, characterized in that: A tight-fitting plug pad is provided at one end of the ground anchor bolt away from the bottom segment, and the tight-fitting plug pad is used to fix the ground anchor bolt and the ground anchor hole.

5. The locking limit test system with adjustable support point and stiffness according to claim 1, characterized in that: The connecting crossbeam is composed of a plate top, a bottom plate and a web. The ends of the plate top and the bottom plate are provided with rounded corners to optimize the stress of the components. The ends of the web are provided with holes that match the bolt connection holes.

6. A locking limit test system with adjustable support point and stiffness according to claim 1, characterized in that: The limiting grid plate and the sliding fluorine plate are arranged on one end of the force transmission grid box away from the splicing column through an adjusting screw.

7. The locking limit test system with adjustable support point and stiffness according to claim 1, characterized in that: The plurality of bolt connection holes are spaced 20 cm apart in the vertical direction.

8. The locking limit test system with adjustable support point and stiffness according to claim 2, characterized in that: The force transmission grid is connected to the standard segment of the splicing column by fastening bolts.

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