Displacement based seismic design method of shear wall structures considering higher mode effect

The Direct Displacement-based Seismic Design(DDBSD) method of shear wall structures considering higher mode effect is provided.The problem that the capacity curve is higher or lower than the demand curve caused by the unreasonable structural scheme is investigated.In elastic stage,the target period of shear wall structures is derived by its target displacement,the method that the natural periods should be smaller than or equal to corresponding target periods is used to select the section rigidity of shear walls.This can ensure that the capacity curve in elastic range is in agreement with the demand curve,and the seismic capacity essentially equals to the seismic demand.In inelastic stage,the over-strength coefficient of concrete shear walls designed by Chinese code which is defined as the ratio of actual bearing capacity to design bearing capacity is discussed,and the bearing capacity demand divided by over-strength coefficient equals to the design bearing capacity which ensures the structure meeting its performance objective in inelastic stage.The paper illustrates the application of the proposed procedures with an example to demonstrate the feasibility.