Numerical simulation of behaviour of gusset plate connections in concentrically braced frame under the cyclic loading

Abstract eng:
Concentrically braced frames (CBFs) are commonly used for the seismic design in high seismic areas due to its high stiffness and strength compare to the moment resisting frame. Past experimental studies [10, 11] have shown that CBFs exihibit poor performances under the severe earthquake loading, resulting brace fracture and the failure in the gusset plate connections. So this study investigate the performances of the brace to beam-column connection through the gusset plate designed according to EC8 [2] and AISC [4] codes and an approach with trilinear yield mechanism, to optimize the design of the gusset plate. For this purpose, 3 finite element models (FE models) are developed in the Midas computer program and a comprehensive series of inelastic analyses are performed to better understand the cyclic behaviour of the gusset plate and the surrounding elements. Two different cyclic loading: nearly symmetrical loading history in compression and tension and the highly unsymetrical loading history are applied to each of the model to investigate the effect of the loading history to the performance of brace and the gusset plate connections. The results of inelastic analyses of the finite element models (FE models) show that the gusset plate connection can significantly influence to the cyclic performance of the CBFs and the try-linear approach could optimize the design of the gusset plate connection. Furthermore, the results show that there is significant influence of the applied loading history to the fracture life of the brace.

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