| Steel-concrete composite box beams have been widely used in high rise building and bridge engineering. Lots of static experimental and theoretical studies on steel-concrete composite beams have been tested at home and aboard. However, research on seismic performance of steel-concrete composite box girder was seldom tested and lags behind the engineering practice seriously. By developing the experimental study and theoretical analysis of composite box girder on seismic behaviors, composite box girder can be used popularization and application in super high rise building and bridge engineering. The research works completed in this paper are as follows:(1) The experiments and theoretical analysis of five steel-concrete composite box beams were conducted under vertical low cyclic loading in this paper. Based on the experimental results of composite box beams, which have different degrees of shear connection and different rations of height to thickness of box beam web, the seismic behaviors such as failure mode, strain regularity, energy dissipation capacity, ductility, deformation recovery ability and stiffness degradation were analyzed.(2) The nonlinear behavior of composite box beam under vertical low cyclic loading is simulated by using finite element software ABAQUS and the load-displacement of calculation curves are compared with the experiment ones. The results show a good agreement between the calculating results and the experimental results and the feasibility of the model.(3) A series of composite box beams with different degrees of shear connection, rations of height and thickness of box beam web, longitudinal reinforcement ratio and transverse reinforcement ratio of concrete on seismic behavior are studied.(4) Based on the experimental research, trilinear restoring force skeleton curve model of steel-concrete composite box beams and hysteretic rule under vertical low cyclic loading are established, and stiffness reduction empirical formula are proposed in this paper. |
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