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Steel-concrete composite truss develops basing on the steel structures and concrete structures, it takes full advantage of the concrete compressive strength and tensile properties of steel, so that the two work together to produce an advantage, which is widely used in engineering. At present, the domestic have little research on seismic behavior of the composite truss, considering material nonlinearity and geometric nonlinearity case, this article study seismic performance of the composite truss. The main research work is as follows:(1) Analysis the load-displacement curve, Von Mises equivalent stress changes, changes in the internal forces of each rod and the elastic-plastic deformation of the entire structure of the composite truss in the monotonic loads, using the finite element analysis software.(2) Using ANSYS finite element analysis software, proceed for cyclic loading analysis to research its capacity, hysteretic behavior, skeleton curves, stiffness degradation, deformation resilience, ductility, energy dissipation capacity and other issues.(3) Proceed for cyclic loading truss analysis for the nine composite trusses of variable parameters to research the influence on seismic performance of the different thickness, different distance of the truss internodes, different numbers of the truss internodes, different heights of the truss. Conclusion:With the slab thickness of the composite truss increases, the hysteresis curves are more and more full, the seismic performances of the structure are getting better and better, the energy dissipation capacity of the structure is gradually increased; With the distance of the truss internodes increases, the bearing force of the structure decreases, but a little change; the stiffness of different numbers of the truss internodes varies widely, but their trends of the stiffness in plastic state are consistent; increasing the truss height, the stiffness of the structure decreases uniformity.
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