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(1 深圳防災(zāi)減災(zāi)技術(shù)研究院, 深圳 518001; 2 云南省地震局, 昆明 650224)

摘要: 以自振周期大于 2s 的某實(shí)際鋼結(jié)構(gòu)建筑為研究對(duì)象,分別在設(shè)防地震和罕遇地震下,輸入含與不含永久位移型地震動(dòng),分別計(jì)算得到隔震結(jié)構(gòu)和非隔震結(jié)構(gòu)的非線性地震反應(yīng). 通過對(duì)比含與不含永久位移型地震動(dòng)作用下的上部結(jié)構(gòu)地震反應(yīng),進(jìn)而分析永久位移對(duì)該類型建筑隔震設(shè)計(jì)的影響. 結(jié)果表明:無論地震動(dòng)輸入是否含永久位移,與非隔震結(jié)構(gòu)相比,隔震結(jié)構(gòu)的層間剪力和傾覆力矩均顯著降低,且降低幅度隨著樓層的升高而增大;在含永久位移型地震動(dòng)與不含永久位移型地震動(dòng)分別作用下,各樓層層間剪力比值與傾覆力矩比值無明顯差別,比值基本在 1 左右;在兩類地震動(dòng)作用下,計(jì)算得到的減震系數(shù)差別不超過 10%;在兩類地震動(dòng)作用下,隔震層支座平均最大拉、壓應(yīng)力及位移相差不大,永久位移型地震動(dòng)作用的放大效應(yīng)不明顯.

關(guān)鍵詞: 長周期結(jié)構(gòu); 鋼結(jié)構(gòu); 永久位移; 隔震設(shè)計(jì)

中圖分類號(hào):TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)11-0110-06

DOI:10. 1970 / j. jzjg. 20212036

Preliminary study on influence of ground motion with permanent displacement on building seismic isolation design

LI Yanhua1, SONG Tingsu1,2, WANG Linjian1,2, LIU Guan1

(1 Shenzhen Academy of Disaster Prevention and Reduction, Shenzhen 518001, China;2 Yunnan Earthquake Agency, Kunming 650224, China)

Abstract: A practical steel structure building with natural vibration period greater than 2s was taken as the research object.Under the fortification earthquake and rare earthquake, the nonlinear seismic response of isolated structure and non-isolatedstructure was calculated subjected to the ground motion with and without permanent displacement respectively. Bycomparing the seismic response of superstructure under the ground motion with and without permanent displacement, theinfluence of ground motion with permanent displacement on the seismic isolation design of this type of building wasanalyzed. The results show that: whether the ground motion contains permanent displacement or not, the inter-story shearforce and overturning moment of the isolated structure are greatly reduced compared with the non-isolated structure, and theseismic isolation effect increases with the increase of the floor; subjected to ground motions with and without permanentdisplacement, there is no significant difference between the shear ratio and overturning moment ratio of each floor, and theratio is basically about 1; under the action of two kinds of ground motions, the difference of calculated damping coefficientis no more than 10%; subjected to two kinds of ground motions, the average maximum tensile and compressive stress anddisplacement of the seismic isolators are similar, and the amplification effect of permanent displacement is not obvious.

Keywords:long period structure; steel structure; permanent displacement; seismic isolation design

∗中國地震局地震科技星火計(jì)劃項(xiàng)目(XH19071),深圳市可持續(xù)發(fā)展科技專項(xiàng)(KCXFZ202002011010039),中國地震局地震科技星火計(jì)劃項(xiàng)目(XH20086),廣東省省級(jí)科技計(jì)劃項(xiàng)目(2018B020208003).

第一作者:李艷華,碩士,主要從事減隔震產(chǎn)品研發(fā)、減隔震建筑結(jié)構(gòu)設(shè)計(jì)、減隔震技術(shù)研究與應(yīng)用,Email:1042082629@qq. com.

[引用本文] 李艷華,宋廷蘇,王林建,等. 永久位移型地震動(dòng)對(duì)建筑隔震設(shè)計(jì)影響初探[ J]. 建筑結(jié)構(gòu),2023,53(11):110-115,102. LI Yanhua,SONG Tingsu,WANG Linjian,et al. Preliminary study on influence of ground motion withpermanent displacement on building seismic isolation design[J]. Building Structure,2023,53(11):110-115,102.