采用自复位U形连接件的装配式钢框架-复合墙结构性能研究

Performance of an assembled steel frame-composite wall structure with self-centering U-shaped connectors

对于内填RC墙的框架结构,为有效减小结构的损伤,改善结构力学性能,本文研究了一种在框架与墙之间设置开缝并安装耗能连接件,能够耗散能量从而有效地保护主体结构。采用ABAQUS分析了不同类型耗能连接件的内力特性以及节点的受力破坏模式。通过在两侧开缝的密肋复合墙-钢框架结构中设置可滑移连接,实现了节点的耗能作用。研究结构表明:U形连接件水平段长度对连接件极限位移影响较大,可以通过双折线理想弹塑性荷载-位移曲线描述U形连接件在竖向压力与水平剪切作用下的荷载-位移关系。采用耗能连接件的结构在加载前期残余变形小,具有一定的自复位能力,并且能满足结构的大变形要求。通过以上分析,本文基于承载能力极限状态提出了耗能连接件的设计公式。

To reduce the damage to a frame structure filled with a reinforced concrete wall and improve its mechani-cal properties,a gap was set between the frame and wall,where energy dissipation connectors were installed to pro-tect the main structure effectively.Therefore,ABAQUS was used to analyze the internal force and failure mode characteristics of different types of energy dissipation connectors.Typical slipping connectors were installed in slits on both sides of the steel frame-composite wall structure to dissipate energy.The results show that the length of the horizontal segment of the U-shaped connector greatly influences the ultimate deformation of the connector.The bi-linear ideal elastoplastic load-displacement curve of the U-shaped connector under vertical compression and horizon-tal shear represents a load-displacement relationship.The residual structural deformation with energy dissipation connectors is small at a relatively small drift ratio,indicating a good self-centering performance.Moreover,it can satisfy the requirement of large structural deformation.The design formulas of energy dissipation connectors were proposed according to the limit state of a load-bearing capacity based on the analysis results.