Experimental Study On Static And Dynamic Performance Of Combined I-beam Frame Structure

Low multi-story light steel structure housing has many advantages such as light weight,fast construction and flexible building form.With the promotion of residential assembly industry policy in China,the development prospect of low and multi-story light steel structure housing is increasingly broad.In this paper,we study the combined I-beam structural system with T-beams connected by self-tapping screws,which can realize rapid installation at the construction site and enhance the construction speed of low and multistory light steel structure houses.This paper firstly conducted static performance tests on the combined I-beam frame test model,studied the damage form of the combined I-beam structure,and analyzed the effect of K-support on the ultimate load carrying capacity and deflection deformation of the structure.The test results show that the combined I-beam structure has good force performance,the shear damage occurs with self-tapping screws,and the K-type support members can effectively improve the lateral displacement stiffness of the combined Ibeam frame structure.The paper adopts ABAQUS software to carry out static numerical analysis of the combined I-beam frame structure,and the calculation results are consistent with the static test results of the test model,which verifies the validity and accuracy of the static numerical analysis.Finally,this paper conducted a shaking table dynamic performance test study on the combined I-beam frame test model.A 1:2 scaled-down test model was designed and fabricated,and the similarity ratio relationship of the test model was derived according to the under-artificial mass similarity ratio theory,and shaking table tests under three different seismic effects were conducted to investigate the dynamic performance of the combined I-beam frame structure.The results show that the self-oscillation frequency of the structure gradually decreases and the damping ratio increases with the gradual increase of the peak acceleration of the input seismic wave,and the displacement response and strain response of the model structure also increase accordingly;the dynamic amplification coefficient of the model structure increases with the increase of the structure height.At the seismic level of 7 degrees,the maximum inter-story displacement angle of the structure at the action of three seismic waves is 1/980,which is less than the limit value of 1/250 of the code,and the overall structure of the model structure is intact after the loading of all working conditions.When the seismic level is 9 degrees rare,the maximum inter-story displacement angle of the structure is 1/211,which meets the requirements of the three levels specified in the seismic code for building structures.Through the static test and finite element analysis and shaking table test,it can be seen that the combined I-beam frame structure has good force performance and can meet the use in high intensity areas.The results of this paper can provide some theoretical basis and application guidance for the application of low and multi-story light steel structure residential system.