Structural multi-dimensional loading test system considering real complex boundary conditions

Abstract

The present invention belongs to the technical field of civil engineering test equipment, and discloses a structural multi-dimensional loading test system that takes into account real and complex boundary conditions, which solves the problem that the stress state of existing pseudo-static and pseudo-dynamic loading equipment in model tests of civil engineering structures is significantly different from the actual situation. The structural multi-dimensional dynamic loading test system that takes into account real and complex boundary conditions includes a main unit part, a base part, a hydraulic power source and a control system. The system can better and more accurately simulate the load borne by the structure in a real working environment, realize its multi-dimensional load loading in six degrees of freedom in space, and can provide more real and more practical experimental data for the destruction research of reinforced concrete materials, components and structures under earthquake action. The research results will help scientific researchers to further reveal the destruction mechanism of reinforced concrete structures, propose corresponding destruction criteria, and develop corresponding earthquake-resistant design methods.

Description

Technical Field

[0001] The invention relates to a structural multi-dimensional loading test system taking into account real and complex boundary conditions, and belongs to the technical field of civil engineering test devices. Background Art

[0002] The damage and collapse of engineering structures during earthquakes are the main causes of economic losses and casualties. Uncovering the earthquake damage mechanisms of engineering structures and proposing effective seismic design methods are crucial for reducing structural seismic response and ensuring the safety of life and property. Due to the complexity of earthquake mechanisms and the seismic performance of structures, seismic model tests are necessary to supplement theoretical analysis. However, in existing seismic model tests, the stress states of structures or components differ significantly from actual conditions. Structural model seismic testing methods suffer from severe size effects due to model scaling. Component tests, which aim to study and characterize failure morphologies and mechanisms in detail, are unable to simulate the multidimensional loading and complex boundary conditions experienced during earthquakes. Therefore, a seismic testing device that can simulate more realistic and complex stress states is needed to further reveal the failure mechanisms of engineering structures under earthquakes, propose more effective structural failure criteria, and develop feasible seismic design methods to ensure the safety of engineering structures during strong earthquakes. Summary of the Invention

[0003] In order to address the deficiencies of the prior art, the present invention provides a multi-dimensional dynamic loading seismic test device capable of simulating real and complex boundary conditions of a structure.

[0004] The technical solutions of the present invention are as follows:

[0005] The main unit includes two horizontal components and one vertical component, and the three components realize multi-dimensional dynamic loading of the test piece in six directions: up, down, left, right, front and back; the two horizontal components are perpendicular to each other, and their composition and working principle are the same; the horizontal component includes two reaction blocks 4, two complex boundary condition actuation systems 5, four lead screws 6, two motors 7, eight screw nuts 8, eight tensioning pulleys 11, two guide rails 2, four wheel assemblies 3 and a chain 10, wherein each reaction block 4 has a plurality of complex boundary condition actuation systems 5, ... A motor 7, four screw nuts 8 and four tensioning pulleys 11 are fixed to the outside of the force block 4, and a complex boundary condition actuation system 5 is fixed to the inside; the two ends of the lead screw 6 pass through the two opposite reaction blocks 4 vertically and are connected to the reaction blocks 4 through the screw nuts 8; the guide rail 2 is fixed to the base 1, and the reaction block 4 is connected to the guide rail 2 through the wheel assembly 3; the motor 7 is connected to the four screw nuts 8 and four tensioning pulleys 11 on the same side through the transmission chain 10; when working, the motor 7 drives the tensioning pulley 11 to rotate, and then The chain 10 drives the four screw nuts 8 to rotate, thereby driving the reaction block 4 to move along the guide rail 2 to adjust the position of the test space and the complex boundary condition actuation system 5; the vertical direction components include a reaction block 4, a motor 7, four screw nuts 8, four tensioning pulleys 11, four screw rods 6, two complex boundary condition actuation systems 5 and a chain 10, wherein a motor 7, four screw nuts 8 and four tensioning pulleys 11 are fixed on the outside of the reaction block 4, and a complex boundary condition actuation system is fixed on the inside. 5. Another complex boundary condition actuation system 5 is fixed to the base 1; one end of the lead screw 6 is fixed to the base 1, and the other end vertically passes through the reaction block 4 and is connected to the reaction block 4 through the nut 8. The motor 7 is connected to the four nuts 8 and four tensioners 11 on the same side through the transmission chain 10; when working, the motor 7 drives the tensioner 11 to rotate, and then drives the four nuts 8 to rotate through the chain 10, thereby driving the reaction block 4 to move in the vertical direction to adjust the test space and the complex boundary condition actuation system 5;

[0006] The complex boundary condition actuation system realizes six-degree-of-freedom boundary load simulation, namely, six degrees of freedom of movement in the X, Y, and Z directions and rotation around the X, Y, and Z directions respectively; the complex boundary condition actuation system includes seven actuators, a frame 12, and an end motion platform 16, wherein the seven actuators include two X-direction actuators 13, one Y-direction actuator 14, and four Z-direction actuators 15; when in operation, the seven actuators coordinate motion loading to support the end motion platform 16, and realize tension, compression, bending, shearing, torsion, or a combination thereof, on the detection part 9;

[0007] The actuator includes two mechanical universal hinges 17 and a servo hydraulic cylinder 18; the servo hydraulic cylinder 18 is located between the two mechanical universal hinges 17; the actuator is fixed to the frame 12 and the end motion platform 16 in different directions through the two mechanical universal hinges; the hydraulic power source provides hydraulic power to the servo hydraulic cylinder 18 under the control of the control system.

[0008] Beneficial effects of the present invention: The structural multidimensional loading test system taking into account real and complex boundary conditions proposed in the present invention is a new type of six-degree-of-freedom multidimensional dynamic loading test system. Compared with the existing technology, the system can better and more accurately simulate the loads borne by the structure in a real working environment, and realize its multidimensional dynamic loading in six degrees of freedom in space. It can provide more real and more practical experimental data for the study of the destruction of reinforced concrete materials, components and structures under earthquakes. Its research results will help scientific researchers to further reveal the destruction mechanism of reinforced concrete structures, propose corresponding destruction criteria, and develop corresponding seismic design methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is an experimental schematic diagram of the structural multi-dimensional loading test system considering real complex boundary conditions of the present invention;

[0010] Figure 2 Schematic diagram of the actuation system with complex boundary conditions;

[0011] Figure 3 is a schematic diagram of the actuator;

[0012] In the figure, 1: base, 2: guide rail, 3: wheel assembly, 4: reaction block, 5: complex boundary condition actuation system, 6: screw, 7: motor, 8: nut, 9: detection part, 10: chain, 11: tensioner, 12: frame, 13: X-axis actuator, 14: Y-axis actuator, 15: Z-axis actuator, 16: end motion platform, 17: mechanical universal joint, 18: servo hydraulic cylinder. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to specific embodiments.

[0014] The present invention provides a structural multi-dimensional loading test system that takes into account real and complex boundary conditions, including a main unit, a base, a hydraulic power source (the hydraulic power source is a prior art and will not be described in detail here) and a control system (the control system is a prior art and will not be described in detail here). The main unit is the core part of this system.

[0015] refer to Figure 1The main body part includes two horizontal components and one vertical component. The three components realize multi-dimensional power loading of the test piece in six directions of up, down, left, right, front and back; the two horizontal components are vertical, and their composition and working principle are the same; the horizontal components include two reaction blocks 4, two complex boundary condition actuation systems 5, four screws 6, two motors 7, eight nuts 8, eight tensioners 11, two guide rails 2, four wheel assemblies 3 and chains 10, wherein each reaction block 4 is fixed with a motor 7, four nuts 8 and four tensioners 11 on the outside, and a complex boundary condition actuation system 5 is fixed on the inside, the screw 6 vertically passes through the two reaction blocks 4 and is connected to the reaction block through the nut 8, the guide rail 2 is fixed on the base 1, the reaction block 4 is connected to the guide rail 2 through the wheel assembly 3, the motor 7 is connected to the four nuts 8 and four tensioners 11 on the same side through the transmission chain 10; when working, the motor 7 drives the sprocket Rotate, and then drive 4 nuts 8 to rotate through chain 10, thereby driving reaction block 4 to move along guide rail 2 to achieve the purpose of adjusting the position of test space and complex boundary condition actuation system; the vertical direction components include 1 reaction block, 1 motor, 4 nuts, 4 tensioners, 4 lead screws, 2 complex boundary condition actuation systems and chains, wherein 1 motor, 4 nuts and 4 tensioners are fixed on the outside of the reaction block, and 1 complex boundary condition actuation system is fixed on the inside, and another complex boundary condition actuation system is fixed on the base, one end of the lead screw is fixed on the base, and the other end passes vertically through the reaction block and is connected to the reaction block through the nut, and the motor is connected to the 4 nuts and 4 tensioners on the same side through a transmission chain; when working, the motor drives the sprocket to rotate, and then drives the 4 nuts to rotate through the chain, thereby driving the reaction block to move in the vertical direction to achieve the purpose of adjusting the position of test space and complex boundary condition actuation system.

[0016] refer to Figure 2 The complex boundary condition actuation system can realize six-degree-of-freedom boundary load simulation, that is, six degrees of freedom of movement along the X, Y, and Z directions and rotation around the X, Y, and Z directions respectively; the complex boundary condition actuation system includes 7 actuators, a frame 12 and an end motion platform 16, wherein the 7 actuators include 2 X-direction actuators 13, 1 Y-direction actuator 14, and 4 Z-direction actuators 15; when working, the 7 actuators coordinate motion loading and support the end motion platform 16, which can realize different forms of load loading such as tension, compression, bending, shearing, torsion or their combination on the detection part 9.

[0017] refer to Figure 3The actuator includes two mechanical universal hinges 17 and a servo hydraulic cylinder 18; the servo hydraulic cylinder 18 is located between the two mechanical universal hinges 17, and the mechanical universal hinge 17 can rotate in any direction; the actuator is fixed to the frame 12 and the end motion platform 16 in different directions through two mechanical universal hinges; the hydraulic power source provides hydraulic power to the servo hydraulic cylinder 18 under the control of the control system.

[0018] The test method of the multi-dimensional loading test system for structures considering real complex boundary conditions:

[0019] refer to Figure 1 When the structural multi-dimensional loading test system considering real complex boundary conditions tests the test piece 9, the test piece 9 is first placed in a suitable test space by moving the reaction block, and the two ends of the test piece 9 are connected to the end motion platform 16 of the two vertical complex boundary condition actuation systems 5; when the actuator moves and loads, the generated load is applied to the test piece 9 through the end motion platform 16, and movement along three axes and rotation around three axes are simultaneously generated at the boundary of the test piece 9. The load on the boundary of the test piece 9 will respond to the change of the actuator load, realizing six-degree-of-freedom coordinated loading and truly simulating the load of the structure at the boundary; thereby, more real and accurate mechanical performance test data can be obtained, laying the foundation for further research by scientific researchers.

[0020] Parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0021] The present invention is not limited to the above-described preferred embodiment. Based on the teachings of this invention, anyone can develop various other structural multi-dimensional static and dynamic loading test systems that consider realistic and complex boundary conditions. All equivalent variations and modifications made within the scope of the present invention are intended to fall within the scope of this invention.

Claims

1. A method for testing a multi-dimensional loading test system for a structure taking into account real and complex boundary conditions, characterized in that: The structural multi-dimensional loading test system with real complex boundary conditions includes a mainframe part, a base part, a hydraulic power source and a control system, wherein the mainframe part is the core part of the system; The main machine part comprises two mutually perpendicular horizontal components and one vertical component, so as to realize multi-dimensional loading of the test piece in six directions, namely up, down, left, right, front and back. The two mutually perpendicular horizontal components have the same composition and working principle. The horizontal component comprises two reaction blocks (4), two complex boundary condition actuation systems (5), four lead screws (6), two motors (7), eight screw nuts (8), eight tension wheels (11), two guide rails (2), four wheel assemblies (3) and a chain (10), wherein one motor (7) is fixed on the outside of each reaction block (4). ), 4 nuts (8) and 4 tension wheels (11), and a complex boundary condition actuation system (5) is fixed inside; both ends of the lead screw (6) vertically pass through two opposite reaction blocks (4) respectively, and are connected to the reaction blocks (4) through the nuts (8); the guide rail (2) is fixed on the base (1), and the reaction blocks (4) are connected to the guide rail (2) through the wheel assembly (3); the motor (7) is connected to the 4 nuts (8) and 4 tension wheels (11) on the same side through the transmission chain (10); when working, the motor (7) drives the tension wheel (11) to rotate, and then through the chain (10) The four nuts (8) are driven to rotate, thereby driving the reaction block (4) to move along the guide rail (2) to adjust the position of the test space and the complex boundary condition actuation system (5); the vertical direction components include a reaction block (4), a motor (7), four nuts (8), four tension wheels (11), four lead screws (6), two complex boundary condition actuation systems (5) and a chain (10), wherein a motor (7), four nuts (8) and four tension wheels (11) are fixed on the outside of the reaction block (4), a complex boundary condition actuation system (5) is fixed on the inside, and another A complex boundary condition actuation system (5) is fixed on a base (1); one end of a lead screw (6) is fixed on the base (1), and the other end vertically passes through a reaction block (4) and is connected to the reaction block (4) through a nut (8); a motor (7) is connected to four nuts (8) and four tension wheels (11) on the same side through a transmission chain (10); when working, the motor (7) drives the tension wheel (11) to rotate, and then drives the four nuts (8) to rotate through the chain (10), thereby driving the reaction block (4) to move in a vertical direction to adjust the test space and the complex boundary condition actuation system (5); The complex boundary condition actuation system (5) realizes six degrees of freedom boundary load simulation, namely, six degrees of freedom of movement along the three directions of X, Y, and Z and rotation around the three directions of X, Y, and Z; the complex boundary condition actuation system (5) comprises seven actuators, a frame (12), and an end motion platform (16), wherein the seven actuators comprise two X-direction actuators (13), one Y-direction actuator (14), and four Z-direction actuators (15); when working, the seven actuators coordinate motion loading, support the end motion platform (16), and realize tension, compression, bending, shearing, torsion, or a combination thereof, on the detection member (9); The actuator comprises two mechanical universal joints (17) and a servo hydraulic cylinder (18); the servo hydraulic cylinder (18) is located between the two mechanical universal joints (17); the actuator is fixed to the frame (12) and the terminal motion platform (16) in different directions through the two mechanical universal joints; the hydraulic power source provides hydraulic power to the servo hydraulic cylinder (18) under the control of the control system; The test method of the structural multi-dimensional loading test system considering real complex boundary conditions: When the test piece (9) is tested by the structural multi-dimensional loading test system considering real complex boundary conditions, the test piece (9) is first placed in a suitable test space by moving the reaction block, and the two ends of the test piece (9) are connected to the end motion platform (16) of the two vertical complex boundary condition actuation systems (5); when the actuator moves to load, the generated load is applied to the test piece (9) through the end motion platform (16). At the boundary of the detection part (9), movement along three axes and rotation around three axes are simultaneously generated. The load on the boundary of the detection part (9) will change in response to the change of the actuator load, thereby realizing six-degree-of-freedom coordinated loading and truly simulating the load on the structure at the boundary.

Images