Seismic Performance Of Prefabricated Shear Wall Structure With Coupling Beam Damper

Prefabricated concrete shear wall structure is a future development trend of building structures due to its good application value and broad development prospect. Many researches have been carried out on the seismic performance of prefabricated structure in recent years. However, previous earthquakes and a large number of experiments show that the seismic performance of prefabricated shear wall structure joint and juncture is a key factor affecting the overall seismic performance of the structure. The current study on prefabricated shear wall structure mainly focuses on the performance of the joint and the effectiveness of various types of damping devices; nevertheless, there is still few researches on the application of damping device to prefabricated shear wall structure in the analysis of overall seismic performance. Therefore, in order to improve the seismic performance of this kind of structure, "dual function" metallic damper is selected and applied to the coupling beams. The main contents of this paper are as follows:(1) Based on the researches on energy dissipation coupling beam damper both at home and abroad, the mechanical properties of damper is simulated by using the ABAQUS software with the combination of the existing "dual function" metallic damper; the deformation mechanism of shearing damper in the coupling beam is analyzed. A link element is put forward to effectively simulate the shear performance of the damper. The numerical analysis shows that the element has a good simulating performance of the shear properties of the "dual function" metallic damper.(2) Then, the damper mentioned above is installed in the middle of coupling beam of shear walls. The impact of different damper thicknesses on the lateral stiffness of shear wall structure under static lateral load is studied; to determine the appropriate thickness of the damper, the lateral bearing capacity of energy dissipation coupling beam is compared by using the link element and solid element. The results show that the thickness of the damper should be selected according to the lateral bearing capacity and seismic behavior of shear walls synthetically; the result of lateral bearing capacity of shear wall structure with the proposed link element is very close to that of the solid element.(3) To verify the damping effect and seismic performance of the shear wall structure with dampers, nonlinear elasto-plastic time-history analysis of high-rise coupling shear wall panels before and after setting dampers is completed. The results show that the damper has a good property of energy dissipation, and the seismic performance of coupled shear wall panel has been improved significantly.(4) For the actual engineering project, the vibration-absorption measure is applied to a high-rise prefabricated shear wall structure. Through the bearing capacity design and layout scheme of dampers, the overall anti-shock performance of the fabricated structure is improved. The results show that with the application of dampers, the number of damaged coupling beam is significantly reduced, further demonstrating the good energy dissipation performance of the coupling beam damper. Moreover, the inter-story drift, structural damage and the base reaction force are reduced as well.