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(1 蘭州理工大學(xué)防震減災(zāi)研究所, 蘭州 730050;2 蘭州理工大學(xué)甘肅省減震隔震國際合作基地, 蘭州 730050)
摘要: 耐震時程法(ETM)是一種新的結(jié)構(gòu)抗震性能評估方法,它所用的時程曲線具有地震強度隨時間而增加的特點. 基于《建筑抗震設(shè)計規(guī)范》(GB 50010—2010),采用最小二乘函數(shù)合成了 3 條耐震時程曲線. 以裝配式基礎(chǔ)隔震結(jié)構(gòu)為例,分別對結(jié)構(gòu)進行 10 條天然地震波作用下的增量動力分析(IDA)和 3 條耐震時程作用下的非線性時程分析,對比研究了結(jié)構(gòu)在不同地震強度下的最大頂點位移、最大層間位移角和最大隔震層位移. 并將最大層間位移角作為指標(biāo)代入結(jié)構(gòu)抗震失效概率公式,通過易損性計算即可得到結(jié)構(gòu)在不同耐震時間下的損傷指數(shù)期望值,可以此為依據(jù)來評估結(jié)構(gòu)的損傷. 分析表明,以最大層間位移角作為指標(biāo),ETM 與 IDA 所得的結(jié)構(gòu)損傷值吻合程度較高,但其計算量較 IDA 大大減小,因此對于結(jié)構(gòu)的抗震損傷評估而言,ETM 是一個高效的計算方法.
關(guān)鍵詞: 耐震時程法; 增量動力分析法; 抗震性能評估; 易損性; 損傷評估
中圖分類號:TU375. 4 文獻標(biāo)志碼:A 文章編號:1002-848X(2023)03-0116-06
DOI:10. 19701 / j. jzjg. 20191530
Seimic damage assessment of structures by endurance time method
DU Yongfeng1,2, LI Wentao1
(1 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050,China; 2 International Research Base on Seismic Mitigation and Isolation of Gansu Province, Lanzhou Universityof Technology, Lanzhou 730050, China)
Abstract: The endurance time method (ETM) is a new method for evaluating seismic performance of structures. The timehistory curve used is characterized by an increase in seismic intensity over time. Based on Code for seismic design of buildings(GB 50010—2010), three endurance time-history were synthesized by using least squares function. Taking the precastconcrete base isolation structure as an example, the incremental dynamic analysis ( IDA) under the action of 10 naturalseismic waves and the nonlinear time-history analysis under the action of three endurance time-history were carried outrespectively, and the structure was compared under different seismic intensities about maximum vertex displacement,maximum inter-story drift and maximum isolation layer displacement. The maximum inter-story drift was used as indicators tosubstitute the seismic failure probability formula of the structure. The damage index expectation of the structure underdifferent endurance time can be obtained by the vulnerability calculation. The damage of the structure can be evaluated basedon this. The analysis shows that when the maximum inter-story drift is used as an index, the ETM has a higher degree ofcoincidence with the structural damage value obtained by IDA, but its calculation amount is greatly reduced compared withthe IDA. Therefore, for the seismic damage assessment of the structure, the ETM is an efficient calculation method.
Keywords:endurance time method; incremental dynamic analysis method; seismic performance evaluation; vulnerability;damage assessment
∗國家自然科學(xué)基金項目(51778276).
第一作者:杜永峰,博士,教授,博士生導(dǎo)師,主要從事結(jié)構(gòu)減振、隔震控制相關(guān)研究,Email: dooyf@ sohu. com.
[引用本文] 杜永峰,李文濤. 基于 ETM 的結(jié)構(gòu)地震損傷評估[J]. 建筑結(jié)構(gòu),2023,53(3):116-121. DU Yongfeng,LI Wentao. Seimic damage assessment of structures by endurance time method [ J]. Building Structure,2023,53 ( 3):116-121.
