1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. School of Civil Engineering, Chang’an University, Xi’an 710061, China
Abstract:Here,according to the similarity theory,similar relations of physical quantities in a dynamic system were deduced based on a mass system dimensions and appropriate similar constants were determined.A 12-story shear wall structure was disassembled,and its model material mix ratio and the model structure’s precast wall plates and connection technique were designed to construct a 1∶5 scaled monolithic precast concrete shear wall (MPCS) structure model and a cast-in-place shear wall (CIPS) one.The failure forms and dynamic characteristics of MPCS and CIPS structure models were contrastively studied with shaking table tests.The results showed that MPCS’s crack forms and their expansion sequence are different from those of CIPS; horizontal cracks in the upper and lower contact surfaces between precast wall plates are one of MPCS’s main damage forms; After connected beams’ends form a plastic hinge,final micro-cracks form at the vertical connection joint surface of MPCS precast wall plates,while those form at the wall limb of CIPS; the micro-cracks at connection contact surface between precast wall plates cause MPCS’s initial stiffness and main frequency to drop more obviously than CIPS’s do; structural damping ratios of both two models increase with increase in PGA,their variation range is 4.2 to 8.2%; the first order vibration shape curve of MPCS is approximated as a "bending" type and gradually becomes outward convex with increase in PGA,and that of CIPS becomes more obvious than MPCS’s does in plastic stage; the second order vibration shape curves of both two models are similar.
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