Seimic Performance Study Of Frame-Shear Wall Structures Based On Deformation Of Components

The current Code for seismic design of buildings(GB 50011-2010) treats the ’three-level precaution, two-stage design’ as the structural seismic design objectives. The design thought is based on the elastic calculation result under the frequent earthquakes to satisfy the member reinforcement, and structural measures to keep the building unfall even under the severe earthquake. Interlayer displacement angle as the macro indicators is unable to directly measure the actual damage state, and get different performance levels on the basis of different requirements.This paper presents the evaluation method for seismic performance based on index limits of the deformation of component. Based on the method, it is effective to get the truly damage conditions, measure the actual seismic capacity, and test the seismic measures in the current codes. Moreover, it’s also of great practicability to engineering which is designed according to different demands of structure seismic performance.This paper designs twenty-four regular frame-shear wall structures with different seismis intensities, different ground motion and different height. Besides, twenty required seismic waves for time-history analysis are selected. According to the research method based on deformation of components, seismic performance of frame-shear wall structures are studied, including the following items:1. According to the research method based on deformation of components, the paper determines the safety of the structure from two aspects. On the one hand, structural damage is measured by the average inter-story drift, so that the structures will not lose capability; On the other hand, it obtains the comprehensive assessment of the safety performance of the structure from the perspective of the deformation member.2. The paper uses Perform-3D and the pre-post-processing program to carry out the elastic-plastic time-history analysis. On the basis of the analysis results, it shows that interlayer displacement angle as the sole criterion for assessing the performance of structures under earthquake could not accurately reflec internal force and deformation state of the structure;Shear wall damage concentrates in the bottom of the wall,and it’s only associated with the underlying displacement angle, no associated with the largest interlayer displacement angle. It’s suggested that set 1/200 as the reference limits for interlayer displacement angle of bottom layers.The distribution of damage of coupling beams is positively correlated with the interlayer displacement angle; Column members maintain good performance in the earthquake, no serious injuries; other findings including that the seismic waves which has a response spectrum curve greater than the specification spectrum during the long period could lead to severe structural damage3. Make a further study on the selection of ground motion and find the relationship with the damage of structure. Put forward Long-Period Spectrum Fitting Confficient and it’s suggested that set the confficient as 0.9 to 1.05. Establish the seismic library as the reference of the seismic wave selection in practical engineering.4. Put forward the concept of safety reliability and safety stock and explore the security reserve capacity of structure in strong earthquakes by means of incremental time history analysis method. Make the quantitative analysis of the collapse resistant capacity of the structure desgned according to code. Conclusion: the structures of 7 degree or 7.5 degree have hige safety reserves about 1.2 to 1.4. The safety reserves of 8 degree is small. With the cofficient, it helps to get the quantitative collapse resistant capacity result of frame-shear wall structure designed according to code and grasp the collapse resistance of structure effectively.