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（1 華東建筑設(shè)計研究院有限公司， 上海 200041； 2 同濟大學(xué)建筑工程系， 上海 200092）
［摘要］通過初步彈塑性分析發(fā)現(xiàn)某500m級巨型框架-核心筒結(jié)構(gòu)在罕遇地震作用下潛在的薄弱環(huán)節(jié)，分析了結(jié)構(gòu)自身特點和外部輸入特征共同導(dǎo)致破壞的原因，通過加強措施對薄弱部位進行改善； 基于典型地震波，不斷加大地震作用強度，考察結(jié)構(gòu)在超強地震作用中的剛度退化過程，通過周期延長程度、能量耗散比例、外框剪力分擔(dān)比例變化情況以及構(gòu)件損壞水平等多個角度對結(jié)構(gòu)的抗震性能進行評估； 并通過振動臺試驗得到的剛度退化數(shù)據(jù)對分析結(jié)果進行校驗。研究結(jié)果表明，該巨型結(jié)構(gòu)抵御超強地震的總體冗余度較高；豎向收進、構(gòu)件截面變化以及伸臂桁架等導(dǎo)致的剛度突變較易形成局部集中破壞，但出現(xiàn)破壞的順序受地震動影響較大；非線性分析方法所得剛度退化規(guī)律與試驗結(jié)果一致，在性能評估中可提供更加豐富的數(shù)據(jù)結(jié)果。
［關(guān)鍵詞］巨型框架-核心筒結(jié)構(gòu)； 超高層建筑； 抗震性能； 超強地震； 破壞模式； 剛度退化
中圖分類號：TU398-7文獻標(biāo)識碼：A文章編號：1002-848X(2020)18-0084-07
Analysis of seismic performance of a 500-meter mega frame-core tube structure under super strong earthquake
AN Dongya1, XU Ziran1,2, BAO Lianjin1
(1 East China Architectural Design & Research Institute Co., Ltd., Shanghai 200041, China;2 Department of Building Engineering, Tongji University, Shanghai 200092, China)
Abstract:According to the preliminary elastic-plastic analysis under the rare earthquake action, the potential weakness of a mega frame-core tube structure with a height of 500 meters was found, and the causes of the damage caused by the characteristics of the structure itself and the external input action characteristics were analyzed. The weak parts were improved by strengthening measures. Based on the typical seismic wave, the earthquake action intensity was continuously increased to investigate the stiffness degradation process of the structure under super strong earthquake. The seismic performance of the structure was evaluated from the perspectives of vibration period extension, energy dissipation ratio, shear sharing ratio of frame and damage level of members. The stiffness degradation data obtained from shaking table test were used to verify the analysis results.The results show that the overall redundancy of the mega-structure against super-strong earthquakes is relatively high, and the abrupt change of stiffness caused by setbacks in elevation, member cross-section change or outrigger truss is more likely to lead to local concentrated damage, however, the sequence of failure is greatly affected by the ground motion. The stiffness degradation law reflected from nonlinear analysis is consistent with that from the table test results, and the nonlinear analysis method could provide much more abundant data in the performance evaluation process.
Keywords:mega frame-core tube structure; super high-rise building; seismic performance; super strong earthquake; failure mode; stiffness degradation
*“上海超高層建筑設(shè)計工程技術(shù)研究中心”建設(shè)項目（14D22252800）。
作者簡介：安東亞，博士，高級工程師,Email:dongya_an@arcplus.com.cn。
