8度区不规则框架消能减震方案及子结构设计  

Energy Dissipation Damping Scheme and Substructure Design of Irregular Frame in 8-Degree Zone

作　　者：颜扬 卢云军[1] 陈伟伟 王淑婷 YAN Yang;LU Yunjun;CHEN Weiwei;WANG Shuting

机构地区：[1]浙江省建筑设计研究院有限公司,浙江杭州310006

出　　处：《浙江建筑》2024年第6期28-34,共7页Zhejiang Construction

摘　　要：高烈度区的不规则框架结构采用传统设计方法时会出现层间位移角超限,竖向构件截面和配筋率异常大以及剪压比超限等问题。经多方案比较,采用屈曲约束支撑+黏滞阻尼器的混合减震方案,各项指标均满足规范要求,具有良好的减震性能,取得了较好的工程实践成效。针对消能子结构进行性能化设计探讨,建立不同性能目标的子结构模型,对大震情况下的消能器耗能情况、减震效果和子结构损伤程度进行对比分析。根据分析结果,提出了消能子结构性能化设计时宜秉承“高延性、中承载力”的设计理念,允许大震下子结构出现部分中度破坏;消能子结构即使发生一定损伤,只要保持足够延性,就有助于消能器充分发挥减震作用;过分加强子结构设计、提高其性能目标尽管保证了大震作用下消能子结构的安全,但会引起消能器耗能下降和子结构周边构件严重损坏。Designing irregular frame in high intensity seismic zone frequently have to meet some difficulties,such as excessive demands of interstory drift,shear-pressure ratio and the cross-sectional dimensions.By comparing several energy dissipation schemes,the combined of buckling-restrained braces(BRB)and viscous fluid dampers(VFD)is selected,achieving success in Engineering.The structure response based on this guidance all meets the requirements of codes and exhibits considerable energy dissipation capabilities.Additionally,the performance-based design of energy dissipating substructures is developed by considering several performance objectives to investigate energy dissipation of devices,shock absorption efficiency and substructure damage.It is proposed that designing energy dissipation substructure should adhere to the concept of"high ductility and medium bearing capacity",which indicates the contribution of substructures as sacrificial components.Certain damage in substructures notwithstanding,it is positively correlated with the shock absorption efficiency within a certain range.However,overestimating the importance of substructures causes to the decrease of energy dissipation and leaves surrounding components at risk of damage.

关 键 词：混合消能减震 屈曲约束支撑 黏滞阻尼器 消能子结构 抗震性能目标 

分 类 号：TU352[建筑科学—结构工程]