Experimental Study On Eccentric Compressive Behavior And Seismic Behavior Of Integral Composite Reinforced Concrete Shear Wall

Prefabricated concrete structure is an important part of construction industry modernization, compared with the traditional cast-in-situ concrete construction mode, the prefabricated concrete structure can effectively reduce environmental pollution, and saves up lots of molding boards and labors, also improve the construction efficiency, making the resources use more reasonable. The superimposed reinforced concrete shear wall is comprised of cast-in-place concrete enclosed by two precast concrete panels; it will have a broad prospect with combining the advantages of cast-in-situ reinforced concrete shear wall and the prefabricated shear wall, such as good integrality and good seismic behavior.Eccentric compression tests and quasi-static tests were conducted to investigate the failure modes, crack development and failure mechanism of the new type of superimposed slab shear wall based on composite slab with precast ribbed panel in this paper. The main work and conclusions were as follows:(1) One conventional reinforced concrete shear wall and seven integral composite reinforced concrete shear walls (ICSW) were designed and manufactured. Experimental parameters include depth-thickness ratio, prefabricated rate, and the direction of composite slab ribs. Eccentric compression tests were conducted to investigate the failure modes and the above parameters on the eccentric compression behavior of the specimen The test results show that ICSW developed high strength and the damages of ICSWs include cracking on composite surface and eccentric compression damage. The compressive strength of ICSW increases with the decrease of the depth-thickness ratio of the walls, and was significantly influenced by the prefabricated rate, while the direction of slab rib has little impact on the compressive behavior of ICSWs.(2) The strengths of ICSWs calculated by Chinese, the US and the European codes show that the estimated by Chinese code was in good agreement with the experimental results. It is found that the calculated results of specimen with sufficient bonding strength between the cast-in-place concrete and precast concrete panels which develop eccentric compression failure modes were more close to the experimental results than the ones which develop bonding failure between precast panels and cast-in-place concrete.(3) To evaluate the seismic behavior of ICSW, quasi-static test of one on one piece of conventional reinforced concrete shear wall and one piece of ICSW were conducted. The failure patterns, bearing capacities, hysteretic curves, skeleton curves, stiffness degradations, strength degradations, displacement ductility and energy dissipation capacities of the two shear wall specimens were investigated. The result shows that there are flexural failures in both of the two specimens; ICSW has well integral properties and its hysteretic characteristics, displacement ductility, stiffness degradation potential and energy dissipation capacity are close to those of conventional reinforced concrete shear wall. The results indicate that the ICSW have good seismic behavior.(4) An analytical model recommended in the Code for Design of Reinforced Concrete High-rise Structure (JGJ3-2010) was found to provide reasonable predictions for flexural capacity, shear capacity of the ICSWs under low cyclic loading. Based on the maximal tension stress theory, formulae of cracking loading of ICSWs under low cyclic loading are presented. Research shows that the calculated results matches well with the experimental results.