地震可恢复功能连梁研究综述与展望

Earthquake resilient coupling beams:a state-of-the-art review

连梁是剪力墙结构的重要耗能构件,可恢复功能连梁具有良好的耗能能力,有效降低结构的层间位移,减小主体结构的损伤,震后可进行更换,成为可恢复功能结构的研究热点之一.基于可恢复功能连梁工作原理,从削弱连梁截面、附加耗能装置以及提高连梁自复位能力3个方面,评述了可恢复功能连梁的研究现状,分析了各类可恢复功能连梁的特点.削弱连梁截面的连梁构造简单,施工方便,但震后残余变形较大;附加耗能装置的连梁具有良好的耗能能力,然而较大的阻尼器变形导致其他构件损伤破坏;自复位连梁性能优越,能有效减小残余变形,但伸长效应显著.提出一种新型自复位双连梁设计方案,介绍其构造与优点,为连梁的抗震设计提供参考.

Coupling beams are significant members to dissipate energy in shear wall structures among which the earthquake resilient coupling beam possesses such advantages as good capacity of energy dissipation,effectiveness of reducing the inter-story drift and the damage to the main structure,as well as the replaceable characteristic after earthquakes.Thus it has become one of the research hotspots of earthquake resilient structures.The research advances of the resilient coupling beam are valuated based on how it works from three main aspects:decrease in the cross section of coupling beam,addition of energy dissipation device and improvement in the self-centering ability of coupling beam.Moreover,the characteristics of various resilient coupling beams are put forward,namely,coupling beams with decrease in the cross section,relatively unsophisticated in structure,are thus accessible for construction,whereas their residual deformation is rather augmented after the earthquake;while those with additional energy dissipation device retain good capacity of dissipating energy,the damage to other components is generated for the fairly large deformation of the damper;self-centering coupling beams show superior performance in mitigating the residual deformation effectively,but their beam elongation effect is more significant.Finally,the design scheme related to a novel type of self-centering double coupling beam is proposed in which the structures and advantages of the proposed beam are introduced.This review provides a reference for the seismic design of the coupling beam.