基于耗能构件的大悬挑钢结构消能减震性能分析

Seismic performance analysis of large cantilevered steelstructures based on energy dissipation members

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摘要以某大悬挑钢结构为实例进行分析,将屈曲约束支撑、黏滞阻尼器等两种减震装置引入结构减震之中,运用SAP2000有限元分析软件建立减震模型。通过弹塑性时程分析方法对大悬挑钢结构进行消能减震分析,对多遇及罕遇地震作用下两种减震装置在不同布置形式、不同布置位置时的减震效果进行对比分析和探讨。结果表明:通过布置屈曲约束支撑或黏滞阻尼器,可以有效减小大悬挑钢结构在地震作用下的最大层间位移角,其中屈曲约束支撑在罕遇地震下减震效果更好。黏滞阻尼器在多遇地震下减震效果更好;在多遇和罕遇地震作用下,两种减震装置均在V型布置时减震效果最优,单斜撑次之。减震装置布置在结构下部耗能能力最强。综合分析表明,黏滞阻尼器在V型布置时在多遇地震作用下即可实现耗能,为结构提供较大附加阻尼,减震效果最好。 Taking a large cantilever steel frame structure as an example,two kinds of shock absorption devices,buckling constraint brace and viscous damper were introduced into the structural shock absorption.The SAP2000 finite element analysis software was used to establish a shock absorption model,and the energy dissipation and shock absorption design of large cantilever steel structure was carried out by elastoplastic time-history analysis method.The damping effect of two kinds of damping devices in different arrangement forms and positions under the action of frequent and rare earthquakes is analyzed and discussed.The results show that for large cantilever steel frame structures,the maximum interstory displacement angle of the structure can be effectively reduced by placing buckling constraint braces or viscous dampers.The buckling constraint braces have better damping effect under rare earthquakes,and the viscous dampers have better damping effect under frequent earthquakes.Under the action of frequent and rare earthquakes,the damping effect of the two kinds of damping devices is the best in the V-shaped arrangement,followed by the monocline brace.From the full degree of hysteresis curve,the energy dissipation capacity of the shock absorber arranged in the lower part of the structure is the strongest.From the comprehensive analysis,the V-shaped viscous damper can realize energy dissipation under the action of frequent earthquakes,and provide large additional damping for the structure,and the damping effect is better.

作者武宗良孙建良张贵阳朱嘉男 WU Zong-liang;SUN Jian-liang;ZHANG Gui-yang;ZHU Jia-nan(School of Civil Engineering and Communication,North China University of Water Resources&Electric Power,Zhengzhou 450003,China)

机构地区华北水利水电大学土木与交通学院

出处《河南城建学院学报》 CAS 2023年第3期25-33,共9页 Journal of Henan University of Urban Construction

基金河南省高等学校重点科研项目资助计划(A560015)。

关键词大悬挑钢结构消能减震屈曲约束支撑黏滞阻尼器时程分析 large cantilevered steel frame construction energy dissipation and shock absorption buckling restrained brace viscous damper time history analysis

分类号 TU352.1 [建筑科学—结构工程]