螺栓钢板加固RC连梁联肢剪力墙抗震性能研究

Seismic Analysis of Coupled Shear Walls with Coupling Beams Retrofitted with Laterally Restrained Steel Plate

连梁是剪力墙结构和框架剪力墙结构的第一道防线,如何通过提高连梁抗震性能进而提高既有结构整体抗震性能具有重要的研究意义。前期试验研究表明,带有钢板屈曲约束装置的RC连梁螺栓钢板加固法(LRSP加固法)可有效提升连梁的抗震性能,但这种方法对联肢剪力墙结构整体性能的提升尚不明确。为了研究LRSP连梁加固方法对整体结构抗震性能的影响,本文基于已开展的LRSP加固连梁的试验研究,提出了适用于加固前后连梁的宏观模型。结合剪力墙精细模型,提出了适用于联肢剪力墙结构的组合式模拟方法,揭示了采用LRSP方法加固前后联肢剪力墙结构的地震损伤机理。结果表明,LRSP加固方法可有效提高连梁的延性和耗能能力,从而提升结构的耗能能力,控制结构位移,减小结构损伤,显著提升联肢剪力墙的抗震性能。

Coupling beam is a critical component for providing the lateral strength,stiffness and deformation capacity of the entire building.Improving the seismic performance of coupling beams and enhancing the seismic performance of the entire building are of great significance.Previous experimental studies demonstrate that the seismic performance of coupling beams could be enhanced effectively by using the laterally restrained steel plate retrofitting method（LRSP retrofitting method）.However,the effect of LRSP retrofitting method on the performance of the entire coupled shear walls structures is still not clear.To investigate the effects of LRSP retrofitting method on the seismic performance of the coupled shear wall structures,based on the experimental studies conducted previously,the macro model of coupling beams,refined model of wall piers and combined model of coupled shear walls are proposed.The numerical results reveal that the ductility and energy dissipation ability of coupling beams are improved by retrofitting the coupling beams with LRSP method,then the energy dissipation ability of the structure is enhanced,the displacement of the structure is reduced,and the damage of the structure is alleviated.Hence,the seismic performance of coupled shear wall structures could be strengthened effectively.