Shaking Table Test Study Of The Complex Steel Frame-bracing System And Finite Element Simulation

Steel frame-bracing system for building is widely available in steel construction, the study makes an important practical sense on the dynamic responses of the system under earthquake action.Steel frame-bracing system is just employed in main structure of the Tianjin library. There are lots of removing columns and trusses with cantilevers in the interior structure with irregular fa?ade.This paper refers the case project of the newTianjin library, researches a shaking table test of 1/20 large-scale model, which was carried out in the shaking table lab of China Academy of building research. This paper designs and products thoroughly the test model before the test, including model material selection, similitude-scaling relationship,discussion for the model construction technology and design of test program. Two natural earthquake waves and an artificial one were input in the test. The dynamic characteristics,acceleration, displacement,strain responses of the model and the destructive forms of the structure under earthquake of different intensity are studied.According to the dynamic behavior and the failure mechanism of the model,the seismic behavior and the reliability of the structure design are estimated.The results showed that the structure can meet the requirements of no-damage under light earthquake,repairable under medium earthquake,and no-collapse under strong earthquake.Furthermore, the structural finite element analysis model is established with ANSYS program, and then the Time-history analysis for the shaking table test model is carried out. The comparison of the structure periods, displacement responses and strain response show that the analysis results are in agreement with the test results. On the one hand, this proves that the data measured in the large-scale model is reliable, on the other hand, it verifies the reliability of finite element model.