- 摘 要
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(北京建筑大學(xué)大型多功能振動臺陣實驗室, 北京 100044)
摘要: 為防止隔震層在極罕遇地震作用下出現(xiàn)過大變形而導(dǎo)致隔震設(shè)施損壞,部分隔震結(jié)構(gòu)安裝了鋼墩或鋼筋混凝土墩等剛性限位裝置. 為了研究剛性限位對基礎(chǔ)隔震結(jié)構(gòu)動力響應(yīng)的影響,設(shè)計三層單跨鋼框架基礎(chǔ)隔震結(jié)構(gòu)以及鋼墩、鋼筋混凝土墩、帶橡膠墊層鋼墩三種剛性限位器,并進行振動臺試驗. 研究不同預(yù)留間隙時三種限位器對基礎(chǔ)隔震結(jié)構(gòu)的位移、加速度、接觸力以及隔震支座豎向荷載等動力響應(yīng)影響的規(guī)律. 試驗結(jié)果表明,剛性限位器能有效減小其隔震層位移,但也會對上部樓層產(chǎn)生較高大的不利響應(yīng),同時會增大隔震支座的豎向荷載,甚至使支座產(chǎn)生拉應(yīng)力. 在鋼墩前設(shè)置橡膠墊層能明顯減小上部結(jié)構(gòu)的加速度響應(yīng),對上部結(jié)構(gòu)位移響應(yīng)、隔震支座豎向力及碰撞點處接觸力影響不大.
關(guān)鍵詞: 基礎(chǔ)隔震; 剛性限位器; 動力響應(yīng); 振動臺試驗
中圖分類號:TU352. 1 文獻標(biāo)志碼:A 文章編號:1002-848X(2023)03-0015-06
DOI:10. 19701 / j. jzjg. ZJ220009
Experimental study on influence of rigid deformation limitation on dynamic response of base isolation structures
DU Hongkai, HAN Miao, JI Jiahao, YU Jiaxin, WANG Haimeng
(Multi-Functional Shaking Tables Laboratory, Beijing University of Civil Engineering andArchitecture, Beijing 100044, China)
Abstract: Steel trusses or reinforced concrete blocks are usually installed in isolated structures as rigid deformation limitersto avoid damage to the isolation system caused by excessive isolation deformation under very rare earthquakes. Toinvestigate the influence of rigid deformation limitation on dynamic response of the base isolation structure, a three-storysingle-span steel frame and three types of rigid deformation limiters including steel trusses, steel concrete blocks, steeltrusses with rubber were designed, and shaking table testing was carried out. The influence laws of the three deformationlimiters with different reserved gaps on structural dynamic responses, including displacement, acceleration, contact forceand vertical force of isolation bearings were researched. The test results show that the rigid deformation limitation caneffectively reduce the displacement of the isolation layer, but it also produces a high adverse response to thesuperstructures, and magnifies the vertical force of the isolation bearing, and even produces tensile stress on the bearing.The rubber cushion in front of the steel truss can obviously weaken the acceleration responses of the superstructure, and haslittle effect on the displacement responses of the superstructure, the vertical forces of the isolation bearings and the contactforce at the contact points.
Keywords:base isolation; rigid deformation limitation; dynamic response; shake table testing
∗國家自然 科 學(xué) 基 金 資 助 項 目 ( 51378047 ), 國 家 自 然 科 學(xué) 基 金 資 助 項 目 ( 51408027 ), 國 家 重 點 研 發(fā) 計 劃 項 目(2019YFC1509500).
第一作者:杜紅凱,博士,高級實驗師,主要從事工程結(jié)構(gòu)抗震與隔震研究,Email:duhongkai@ bucea. edu. cn.
[引用本文] 杜紅凱,韓淼,籍嘉浩,等. 剛性限位對基礎(chǔ)隔震結(jié)構(gòu)動力響應(yīng)影響試驗研究 [ J]. 建筑結(jié)構(gòu),2023,53(3):15-20. DU Hongkai,HAN Miao,JI Jiahao,et al. Experimental study on influence of rigid deformation limitation ondynamic response of base isolation structures[J]. Building Structure,2023,53(3):15-20.
