Key Technology Research On Performance-based Seismic Design Of RC Shear Wall

Performance-based seismic design method can not only propose the capacity requirement, but also set a desired deformation limit according to the needs of the owner to design the structure, so that can reduce the losses that caused by the earthquake and reach the best performance-price ratio in the whole life of the structure. It is the direction of the developing of the seismic code for various countries. RC shear walls are usually the first seismic fortification line of high-rise buildings, so it is very important to design the RC shear walls to have good seismic performance in the premise of ensuring safety and reducing economic loss. RC shear walls that are designed by capacity-based design method have a certain reliability in ensuring the capacity, but can not predict the real response of the structures under the effect of rare earthquake even design earthquake. In this paper, systemic analysis about the impacts of facts on the seismic performance of RC shear wall is carried out. A classification criterion of RC shear wall failure mode is proposed based on collected experimental data, in the criterion there is contained three parameters that are shear span ratio, axial load ratio and flexure shear ratio. The reliability and feasibility of the FE model and parameters are verified by simulating 20 RC shear wall specimens tested by internal and abroad scholars using ABAQUS finite element software, based on this a set of rectangular RC shear walls are designed to do FE analysis and plastic performance limits of RC shear wall under frequent earthquake, design earthquake and rare earthquake are proposed by arranging the analyzed results. The main contents in this paper are as follows:1. Summarize the RC shear wall seismic performance experimental researches done by internal and abroad scholars, and systemically analysis about the impacts of facts such as shear span ratio, axial load ratio, reinforcing conditions on the capacity, deformability and failure mode of RC shear wall.2. Study the classifications of RC shear wall failure mode. Analysis the collected experimental data of 60 RC shear walls and propose a new RC shear wall failure mode classification criterion which is contained three parameters that are shear span ratio, axial load ratio and flexure shear ratio, the criterion considers the effect of external force and the actual capacity of RC shear wall.3. Simulate 20 single slice cantilevered RC shear wall specimens tested by internal and abroad scholars using ABAQUS finite element software. In the simulation, concrete damage plasticity mode is used for concrete as the constitutive model, and perfect elastic-plastic model or double-slash model is used for reinforcing bar according to corresponding experiments. Comparison of load-deformation curve and failure modes of the specimens between the calculated result and experimental result is done, finding that the calculated result agree well with the experimental result. It is indicated that the calculated result of single slice cantilevered RC shear wall simulated by using ABAQUS is credible when suitable material constitutive models and FE parameters are selected.4. On the basis of the accuracy and feasibility of FE method, the author designs 133 rectangular cantilevered RC shear walls as the shear span ratio, axial load ratio, boundary vertical reinforcement ratio and flexure shear ratio changed, and calculates the 133 RC shear walls by using concrete damage plasticity model for concrete and perfect elastic-plastic model for reinforcing bars. Analysis about the impacts of the four parameters on the plastic deformability and failure mode of RC shear wall are conducted. The plastic deformation limits of RC shear wall components with different shear span ratios are proposed based on the analyzed result, it can provide corresponding reference for performance-based seismic design of RC shear wall.