Fragility Analysis Of Prefabricated Shear Wall With Dissipation Device Under Earthquake Sequences

With the rapid development of urbanization in our country,fabricated structure has been vigorously promoted to satisfy the large demands of the development of construction industrialization and housing industrialization in China.Fabricated shear wall structures are widely used in modern construction industry because of its better seismic performance.It’s well known that there are a large number of horizontal and vertical joints in the fabricated shear wall structure.The reinforcement arrangement at the joints is relatively dense,which increase the difficulty of construction technology.It is difficult to guarantee the joints quality because of the high requirement of construction accuracy.As a result,the overall seismic performance of the structure is greatly affected.Therefore,this paper proposes to use dampers as dry connectors to assemble prefabricated walls.On the one hand,it can reduce the amount of horizontal reinforcement connections and the amounts of cast-in-situ work,which is easily to control the quality of construction.On the other hand,it can use the good energy dissipation characteristics of dampers to consume seismic energy and improve the seismic performance of fabricated structures.Based on ABAQUS finite element software platform,hysteretic behavior of damper is studied firstly,and applied to fabricated shear wall.The reliability of the connection method is verified by numerical analysis method.The finite element models of high-rise fabricated shear wall with energy dissipation device and cast-in-situ shear wall are established,and seismic motions are selected from PEER strong earthquake database.The seismic response of fabricated shear wall with energy dissipation device and cast-in-situ shear wall is analyzed.The seismic response reduction of fabricated shear wall with energy dissipation devices is verified from the maximum of top displacement and inter-story drift angle and the concrete damage.The response characteristics of the fabricated shear wall with energy dissipation device under the main shock and earthquake sequences are studied by using the non-linear dynamic time history analysis method,and the cumulative damage caused by the earthquake sequences to the structure is analyzed.Probabilistic seismic capacity analysis and probabilistic seismic demand analysis of fabricated shear wall with energy dissipation device are carried out to calculate the conditional probability that the structural demand parameters reach or exceed a certain limit state under different ground motion intensity,and then the fragility curves under the action of main shock and earthquake sequences are given.The results show that the maximum of top displacement and the inter-story drift angle of the fabricated shear wall with energy dissipation device are less than that of the cast-in-place wall under the action of seismic motion,which shows good energy dissipation effect.The damper can improve the shear wall capacity of resist seismic motion,and effectively dissipate seismic energy.Compared with main shock,the maximum of the top displacement and the inter-story drift angle of the structure under the action of earthquake sequences increased in some degree.Cumulative damage of structures is caused by earthquake sequences.The fragility curves of the structure under the earthquake sequences are above the main shock.With the increase of coefficients of earthquake sequences,the probability of the fabricated shear wall with energy dissipation device exceeding the specific limit state is higher than that of the main shock.