Multi-Dimensional Seismic Loading System With Six Degrees Of Freedom
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Solution Overview
Problem
Existing seismic model tests fail to accurately simulate real complex stress states and boundary conditions of structures during earthquakes, leading to incomplete understanding of damage mechanisms and ineffective seismic design methods.
Innovation Solution
A multi-dimensional dynamic loading seismic experiment device with six degrees of freedom, comprising horizontal and vertical components with reaction blocks, electric machines, screw rings, tensioners, guide screws, and complex boundary condition actuating systems, capable of applying multi-dimensional loads including tension, compression, bending, and torsion through coordinated motion of actuators and hydraulic power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional seismic model tests are used, then the test setup is simple, but the stress state of structures cannot accurately reflect actual earthquake conditions
Solution Approach 1:
The loading system is divided into multiple independent reaction blocks (first reaction block, second reaction block, third reaction block, fourth reaction block) that can be controlled separately. Each reaction block can apply independent forces and moments, allowing complex stress states to be simulated by combining simpler individual actions.
Solution Approach 2:
The system transitions from conventional single-axis loading to multi-dimensional loading by adding vertical reaction blocks and moment application capabilities. The test piece can be subjected to forces and moments in multiple directions simultaneously, creating realistic three-dimensional stress states that conventional tests cannot achieve.
2Adaptability or versatility
If multi-dimensional loading is implemented, then the stress state simulation improves, but the device complexity increases
Solution Approach 1:
Each reaction block is designed as a multi-functional unit that can apply both forces and moments simultaneously. The reaction blocks serve multiple purposes: providing vertical support, applying horizontal forces, and applying moments about different axes. This reduces the need for separate specialized components for each loading type.
Solution Approach 2:
The system merges the functions of force application and moment application into a unified loading system. The reaction blocks combine translational and rotational actuation mechanisms, allowing simultaneous application of multiple load types through a single integrated structure rather than requiring separate systems for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides more accurate and realistic loading simulations, enabling detailed study of damage mechanisms and generating valuable data for developing effective seismic design criteria for reinforced concrete structures.
Implementation Method 1
a hydraulic power supply (not shown in the figure) provides hydraulic power for the servo hydraulic cylinder
Implementation Method 2
a servo hydraulic cylinder (18) under the control of a control system
Data Source
AI summary
A structure multi-dimensional loading test system considering real complex boundary conditions considering real complex boundary conditions comprises a main part of machine, a base part, a hydraulic power supply and a control system. The system can simulate the load borne by a structure in a real working environment better and more accurately, realize multi-dimensional loading of the structure with six degrees of freedom in space and provide more real and valuable experimental data for the research on damage of reinforced concrete materials, components and structures under the action of an earthquake, and the research results will help researchers further reveal the damage mechanism of reinforced concrete structures, put forward the corresponding damage criteria and develop the corresponding seismic design methods.