Research on shaking table test of composited I-beam frame-K bracing structure
In order to investigate the seismic performance of the composite I-steel frame structure,K-bracing shaking table test was carried out on the model.A 1/2 scale frame model with two stories and a single span was designed.Three seismic waves including El Centro wave,Wolong wave and Jiangyou wave were selected as unidirectional excitation inputs,the dynamic characteristics,acceleration response,displacement response and strain response of the structure were measured and analyzed.The test results show that when the peak acceleration of earthquake increases step by step from 0.1g to 0.62g,the natural frequency and stiffness of the frame structure decrease slightly,the structural stiffness decreases,the damping ratio increases slightly.The structural dynamic amplification coefficient first increases,then gradually decreases due to the accumulation of structural damage.Under a seismic fortification of 7.5 degrees,the maximum story drift angle of the structure is 1/952,and under a rare earthquake of 9 degrees,the maximum story drift angle of the structure is 1/211.The structural strain curve changes linearly,and there is no buckling observed in the frame beams,columns and supporting components.The specimens remain in an elastic state,indicating that the seismic energy dissipation effect of the structure is good and meets the seismic fortification requirements of high-intensity areas.
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