| Steel plate shear wall(SPSW)is a kind of excellent lateral resistance component suitable for high-rise buildings,which is composed of infill steel plate,vertical boundary element and horizontal boundary element.It has the characteristics of high bearing capacity,large lateral stiffness,good ductility and strong energy consumption ability.However,the performance-based seismic design(PBSD)of the SPSW structure has the problems of low efficiency and complex analysis methods,especially in the design of high-rise structures and the need to achieve multiple performance goals,and the problems are particularly prominent,which brings serious obstacles to the application of the SPSW structure in practical projects.In the existing performance-based seismic design methods,although the seismic performance objectives are refined,they are still discrete and unique.In addition,because of the randomness of earthquake,the seismic performance of structures should be expressed in the way of probability essentially.In order to solve the above problems,this paper focuses on three aspects: simplified analysis model of frameSPSW structures,seismic design method based on simplified analysis model and seismic performance evaluation based on full probability.It mainly includes the following contents:(1)A simplified analysis model of the frame-SPSW structure is proposed.The frameSPSW structure is divided into frame part and SPSW part,which are replaced by an equivalent single-degree-of-freedom(SDOF)system.Two equivalent SDOF systems are combined in parallel,and an equivalent dual SDOF system is obtained.The equivalent SDOF system as a simplified model is used to replace the original structure for dynamic analysis.The effectiveness of the simplified model is verified by static and dynamic nonlinear analysis.(2)The simplified design method of the frame-SPSW structure is developed.For the low-rise structure,the frame part is designed according to the code,and the calculation formula of the displacement threshold of the equivalent SDOF system with the maximum inter-story drift ratio(IDR)as the performance objective is constructed.The displacement demand of the equivalent SDOF system is obtained by solving the motion equation,and the seismic performance demand of the SPSW structure is determined and designed by comparing the displacement demand and displacement threshold.Based on the design parameters of the SPSW structure,the equivalent dual SDOF system is constructed.The nonlinear dynamic analysis is used to verify whether the displacement demand of the equivalent dual SDOF system meet the requirements.If not,the SPSW is redesigned.In the design of high-rise structure,multi-modal analysis is introduced to consider the influence of high-order mode.After derivation,the displacement threshold calculation method of high-rise structure is developed.(3)The seismic performance evaluation of the frame-SPSW structure based on simplified analysis model is carried out.Considering that the deformation modes of frame structure and SPSW structure show the characteristics of shear deformation and flexure deformation respectively,a simplified flexure-shear model for seismic performance evaluation is proposed,and a detailed modeling method is given.The validity of the simplified flexure-shear model is verified by comparing the period,the IDR and the lateral displacement of floors.The seismic risk analysis,structural response analysis,damage analysis and loss analysis of the structure are carried out by using the theory of PEER full probability seismic performance evaluation.The analysis shows that the seismic performance of the frame-SPSW structure is excellent,and the repair cost and repair time after earthquake mainly come from non-structural components.Using the simplified flexure-shear model for seismic performance evaluation can not only get the similar results with the refined finite element model,but also greatly improve the evaluation efficiency. |
