Optimization And Preliminary Application Of Micro-model Quasi-static Loading System

In the field of seismic engineering research,under the condition that the establishment and numerical solution of the nonlinear system motion equations are not perfect,it is a means to explore the seismic resistance of structures by using experimental methods.Commonly used structural seismic testing methods in the field of seismic engineering include: static cyclic testing,shaking table testing,and pseudo-dynamic testing.As the object of structural testing,the test model is often as close to the prototype as possible to observe the details of cracks and dynamic processes of structural damage,but at the same time the cost of such structural testing is also higher.Therefore,when the main research is on the destruction mechanism,a large number of small-scale model tests may be considered to ensure more damage rules while ensuring the cost.This paper intends to design a supporting system for the test,a stiffness improvement schemes against the connecting member and the small steel frame reaction wall of the purpose of carrying out the test of the micro-model test.A piece of masonry pseudo-static wall is utilized to the trial operation of the test system.The thesis mainly completed the following work:1?For the micro-model proposed static loading with six degrees of freedom actuator,combined with the six degrees of freedom actuator,steel frame reaction wall characteristics,the actuator-steel frame reaction wall joints are designed,and numerical simulation simulation analysis method to check the deformation capacity and strength of the joints.The results demonstrate that the steel-frame reaction wall-actuator connector has strong deformation resistance and easy installation.2?according to the specific conditions of the micro-model specimens and considering the different constraint modes between the actuator and specimens,the fixture type connector and the improved bolt rod connector are designed respectively.The numerical simulation analysis shows that the stiffness of both types of connectors can meet the accuracy requirements,but the improved bolt rod connector has better performance,and the clamp connector is adapted for the loading of specimens with low ultimate load capacity.3?Based on the idea of separate actuator,the design and analysis of the roller bearing pressure type double-cylinder linkage proposed static loading system is carried out.Compared with the six-degree-of-freedom actuator static proposed loading system,the roller bearing double-cylinder linkage static proposed loading system has good flexibility,less deformation of the reaction wall system,and more significant characteristics of the applied load.4?In view of the shortcoming of large deformation of the existing steel-frame reaction wall under high strength reaction load,based on the existing reaction wall and doublecylinder linkage system design ideas,design a variety of steel-frame reaction wall reinforcement schemes,and use numerical simulation for comparative analysis,and finally determine the steel-frame reaction wall reinforcement scheme with optimal load capacity and stronger deformation resistance.5?Design a constrained masonry structural shrinkage model,and use the micro-model proposed static loading system for loading,and simulate the whole process of micromodel experiments to verify.The validation results are shown that the model loading system in this paper has strong feasibility and stability.