基于能量及損傷的主余震地震動對超限高層結構抗震性能影響研究*
李錢1，吳軼1，Vincent Lee2，張春梅1，陳麟1，王宏偉1
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（1 廣州大學土木工程學院， 廣州 510006； 2 Astani Civil & Environmental Engineering of University of Southern California, Los Angeles 90089)
［摘要］以第一周期為8.57s的某超限高層框架-核心筒建筑結構為研究對象，選取7條實際長周期主余震序列型地震動，并與單主震地震動一起作為輸入樣本，通過有限元軟件PERFORM-3D對結構進行非線性動力時程分析；著重從結構整體、樓層滯回耗能情況及構件材料損傷等反應量角度來研究主余震地震動對超限高層建筑結構抗震性能的影響。研究結果表明，相對單主震地震動，結構在主余震地震動作用下整體滯回耗能增幅最大達到31.34%，樓層滯回耗能增幅最大可達到45.71%；同時余震地震動作用會使結構中構件損傷逐步累積過渡，導致部分構件轉變?yōu)閲乐負p傷狀態(tài)。因此，對于超限高層建筑結構，僅根據(jù)現(xiàn)行規(guī)范或超限高層建筑專項審查研究超限高層在單次主震地震動作用下的抗震能力并不能很好地評估結構的抗震性能，建議對超限高層建筑結構進行非線性動力時程分析時補充余震地震動作用的影響，從而全面、安全可靠地評估超限高層建筑結構的抗震性能。［關鍵詞］主余震地震動; 超限高層; 框架-核心筒結構; 非線性動力時程分析; 滯回耗能; 材料損傷中圖分類號：TU973.2 文獻標識碼：A 文章編號：1002-848X(2016)09-0042-06
Study on the effects of main aftershock ground motions on seismic performance of high-rise structures beyond the code-specification based on energy and damageLi Qian1, Wu Yi1, Vincent Lee2, Zhang Chunmei1, Chen Lin1, Wang Hongwei1（1 School of Civil Engineering of Guangzhou University, Guangzhou 510006, China; 2 Astani Civil & Environmental Engineering of University of Southern California, Los Angeles 90089, USA）Abstract: An high-rise frame-corewall structure beyond the code-specification with the natural vibration period of 8.57s was selected as research object. PERFORM-3D FEM software was employed to conduct the nonlinear dynamic time-history analysis of the structure under input samples of sequence-type ground motions of seven actual long-period main aftershocks and single main shock ground motions. Structural hysteretic energy dissipation, floor hysteretic energy dissipation and material damages of structural components were mainly investigated to study the effects of main aftershock ground motions on seismic performances of high-rise building structure beyond the code-specification. Results show that the total structural hysteretic energy dissipation could be up to 31.34% and floor hysteretic energy dissipation under main aftershock ground motions could be up to 45.71% in maximum respectively more than that under only single main shock ground motions; and material damages of structural members are accumulated continually under aftershock ground motions, and serious damage state could be found in some structural components. Therefore, for high-rise building structures beyond the code-specification, seismic performance of the structure might not be estimated properly if only single main shock ground motions are adopted according to the current code or specification of peer review for high-rise buildings beyond the code-specification. Aftershock ground motions are recommended to be supplemented to the nonlinear dynamic time-history analysis of high-rise building structures beyond the code-specification, which can reasonably and safely evaluate seismic performances of high-rise building structures beyond the code-specification.Keywords: main aftershock ground motion; high-rise beyond the code-specification; frame-corewall structure; nonlinear dynamic time-history analysis; hysteretic energy dissipation; material damage
*國家自然科學基金青年科學基金（51108104），廣東省自然科學基金（S2012010010074），市屬高校“羊城學者”（12A001D），省科技計劃項目（2013B020200016）科研項目及國家留學基金委資助。通訊作者：吳軼，教授，博士，Email：cv-wuyi@gzhu.edu.cn。
