(华东建筑设计研究院有限公司, 上海 200002)

摘要: 基于某实际工程案例,通过设置不同的计算模型,深入分析了阻尼比取值对高层结构地震响应的基本影响规律特征,在此基础上讨论了计算方法的合理选用以及消能减震设计的相关问题. 结果显示,时程分析法与反应谱法两种方法反映出的阻尼比对地震响应的影响呈现较大差异性,通常时程分析法能获得更加显著的地震响应降低效果,并且这种差异性与结构的基本周期密切相关,基本周期越大则差异程度越大. 讨论了脉冲型地震动对阻尼的敏感性,结果表明提高阻尼对脉冲型地震动输入响应的“削峰”作用不明显,阻尼作用更多体现在对后续振动衰减速度的影响上. 最后提出一种新的减震计算分析流程,并建议了以位移为减震目标时的消能减震设计应对策略.

关键词: 高层结构; 阻尼比; 时程分析; 反应谱分析; 消能减震

中图分类号:TU398. 7 文献标志码:A 文章编号:1002⁃848X(2022)10⁃0123⁃06

DOI:10. 19701 / j.jzjg.HDY2245

Influence law of high⁃rise structure damping ratio on seismic response and designdiscussion of seismic energy dissipation

AN Dongya, ZHOU Jianlong

(East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China)

Abstract: Based on an actual project case, through setting different calculation models, the basic characteristics of theinfluence of damping ratio value on the seismic response of high⁃rise structure was studied in depth, on the basis of this,the reasonable selection of calculation method and the related problems of seismic energy dissipation design were discussed.The results show that the influence of damping ratio reflected by time history analysis and response spectrum analysis wasquite different, and time history analysis method could obtain more significant reduction effect of seismic response, and thedifference was closely related to the basic period of the structure. The greater the basic period is, the greater the differenceis. The sensitivity of impulse ground motion to damping was discussed and the results show that the " peak clipping" effectof increasing damping was not obvious as to the response of impulse ground motion, and the damping effect was reflected inthe influence on the subsequent vibration attenuation speed. Finally, a new calculation and analysis process of seismicenergy dissipation was proposed, and the design strategy of seismic energy dissipation was proposed when the displacementwas taken as the target.

Keywords: high⁃rise structure; damping ratio; time history response analysis; response spectrum analysis; seismicenergy dissipation

∗上海超高层建筑设计工程技术研究中心”建设项目(14DZ2252800),上海市优秀技术带头人计划资助项目(21XD1430500),上海市自然科学基金资助项目(21ZR1415300).

第一作者:安东亚,博士,正高级工程师,主要从事性能化抗震设计与减隔震设计研究,Email:dongya_an@ ecadi.com.

[引用本文] 安东亚,周建龙. 高层结构阻尼比取值对地震响应的影响规律及减震设计思考[ J]. 建筑结构,2022,52(10):123⁃128. AN Dongya,ZHOU Jianlong. Influence law of high⁃rise structure damping ratio on seismic response anddesign discussion of seismic energy dissipation[J]. Building Structure,2022,52(10):123⁃128.