Deformation And Energy-based Seismic Damage Assessment Of Frame-shear Wall Structure

Performance-based seismic design is a design process to explicitly considering the performance objectives in the full-life cycle of new buildings as well as existing buildings.To realize this target,PEER proposed the next generation performance-based design framework where performance objectives with expectations regarding the amount of damage a building in response to earthquake shaking,are correlated and quantified with the consequences such as the economic loss,recovering period,and human casualties.Assessing performance capability is the key of the procedure.However,existing criteria of performance levels are not clear and not verified sufficiently by experimental data.In respect of the issues above,the main research contents and findings are as follows:1.Experimental database is established including RC shear walls,RC coupling beams,RC frame joints and infilled walls.The performance levels are classified based on the damage phenomena of specimens.Experimental data are collected from literatures of quasi-static tests,including the design parameters and the responses corresponding to each performance level.2.Five damage states,i.e.,full operation,slight damage,moderate damage,serios damage,and near collapse,are defined by experimental phenomena and the corresponding data.The influence of primary design parameters on the development of damage is also studied.Based on the experimental database,the damage index considering both deformation and energy dissipation is modified to estimate damage states of RC shear walls and RC coupling beams.3.Based on the experimental database,the modified damage index is adopted to calculate the corresponding damage index of each performance level of RC shear walls and RC coupling beams,and the suggested intervals of damage index of each performance level are given with a certain probability.4.The seismic damage assessment framework based on components is established.The seismic damage assessment of a frame-shear wall is carried out based on the modified damage index considering both deformation and energy dissipation of components.Story damage index is affected by each component damage state,and the damage index of the whole structure is affected by the location of each floor.The result shows that the weight coefficient of floor position has little influence on the overall stuctural damage index when PGA is 0.07 g,its influence begins to be bigger when PGA is 0.22g,becomes prounced when PGA is 0.40g.