In order to study the mechanical behaviors of composite slabs under reciprocating loads,nonlinear finite element models of simply supported composite slabs with different roughness of composite surfaces were es-tablished.By examining the hysteretic curve,skeleton curve,stiffness degradation,energy dissipation coeffi-cient,ductility coefficient and other characteristics of the contrast slabs,the influences of the composite surface roughness,the thickness ratio of the precast layer to the cast layer,the reinforcement ratio of the truss reinforce-ment,the shear reinforcement form and other parameters on the mechanical behaviors of the composite slabs were studied.The results showed that the hysteretic curves of the composite slabs with trusses and steel bars had a certain"pinch"phenomenon compared with the hysteretic curves of the cast slabs.The stiffness and energy dissipation properties of the composite slabs increased after the drawing of the composite surface,and the dis-placement ductility of the composite slabs was lower than that of the cast slabs.The thickness ratio of precast slab to post cast slab had significant influence on the bearing performance and energy dissipation capacity of components.The larger the reinforcement ratio of the truss,the stronger the bearing capacity and energy dissi-pation performance of the composite slab,but the worse the ductility.The composite slab equipped with tradi-tional shear reinforcement had better bearing capacity and stiffness,while the composite slab equipped with new shear reinforcement had better energy dissipation capacity and ductility.
Truss reinforced composite slabsFinite element methodOverlapping surfaceLow cyclic loadHysteretic behaviors
万方数据
维普
