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(北京工業(yè)大學(xué)建筑工程學(xué)院, 北京 100124)

摘要: 為解決傳統(tǒng)隔震支座豎向抗拔能力較差,且不能對(duì)建筑結(jié)構(gòu)進(jìn)行豎向隔震等問題,提出一種具有較優(yōu)抗拔能力的三維隔震支座,并研究了該支座水平及豎向自由度的力學(xué)性能. 首先將具有豎向隔震能力的碟簧組裝置與高阻尼橡膠隔震支座串聯(lián)結(jié)合,然后在支座外部設(shè)計(jì)抗拔裝置,共同組成抗拔型三維隔震支座. 而后建立了三維隔震支座實(shí)用分析模型,并對(duì)其水平和豎向力學(xué)性能進(jìn)行計(jì)算,通過與試驗(yàn)結(jié)果進(jìn)行對(duì)比,以驗(yàn)證模型的有效性;之后對(duì)三維隔震支座轉(zhuǎn)動(dòng)自由度及承受上拔力時(shí)的力學(xué)性能進(jìn)行了數(shù)值分析. 研究結(jié)果表明:三維隔震支座實(shí)用模型能有效模擬三個(gè)平動(dòng)自由度的力學(xué)性能. 當(dāng)支座處于隔震狀態(tài)時(shí),抗拔裝置還起到傳導(dǎo)高阻尼橡膠隔震支座提供的水平力作用. 得到了轉(zhuǎn)動(dòng)自由度的剛度曲線及彎矩-轉(zhuǎn)角曲線,其中彎矩-轉(zhuǎn)角曲線近似為雙線性模型;支座抗拔能力較強(qiáng),在抗拔裝置發(fā)揮作用之前,荷載-位移曲線會(huì)出現(xiàn)零剛度段;得到了抗拔裝置發(fā)揮作用時(shí)的三維隔震支座的荷載-位移曲線,為隔震結(jié)構(gòu)出現(xiàn)上拔力時(shí)的動(dòng)力計(jì)算提供條件.

關(guān)鍵詞: 抗拔型三維隔震支座; 抗拔能力; 碟形彈簧; 高阻尼橡膠隔震支座; 數(shù)值模擬; 力學(xué)性能

中圖分類號(hào):TU352. 12 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)05-0081-07

DOI:10. 19701 / j. jzjg. 20200073

Research on mechanical characteristics of anti-extraction three-dimensionalseismic isolation bearing

XUE Suduo, CHANG Hailin, LI Xiongyan, LIANG Shuanzhu

(College of Civil Engineering, Beijing University of Technology, Beijing 100124, China)

Abstract:In order to solve the disadvantages of the traditional seismic isolation bearing such as poor of the verticalanti-extraction resistance and can not be used for vertical isolation of building structures, a three-dimensional seismicisolation bearing with better anti-extraction resistance was proposed, and and the mechanical characteristics of the horizontaland vertical degrees of freedom of the seismic isolation bearing were also studied. First, the disc spring assembly devicewith vertical seismic isolation capability was connected in series with the high damping rubber seismic isolation bearing,then the anti-extraction device was designed outside the support to form an anti-extraction three-dimensional seismicisolation bearing. Secondly, a practical analysis model of the anti-extraction three-dimensional seismic isolation bearing wasestablished, and its horizontal and vertical mechanical characteristics were calculated, which were compared with the testresults to verify the effectiveness of the model; after that, numerical analysis was carried out on the degree of rotationfreedom of three-dimensional seismic isolation bearing and the mechanical performance when it bears the pull-up force. Thestudy results show that the three-dimensional seismic isolation bearing practical model can effectively simulate themechanical characteristics of three translational degrees of freedom. When the bearing is in isolation state, theanti-extraction device also plays the role of conducting the horizontal force provided by the high damping rubber seismicisolation bearing. The stiffness curve and the moment angle curve of the rotational freedom were obtained, and themoment-angle curve is approximate to bilinear model; the bearing has strong anti-extraction resistance, before theanti-extraction device works, the load-displacement curve will appear zero stiffness section; the load-displacement curve ofthe three-dimensional seismic isolation bearing when the anti-extraction device works was obtained, which providesconditions for the dynamic calculation of the isolated structure when the pull-up force occurs.

Keywords: anti-extraction three-dimensional seismic isolation bearing; anti-extraction resistance; disc spring; highdamping rubber seismic isolation bearing; numerical simulation; mechanical characteristic

∗國家重點(diǎn)研發(fā)計(jì)劃課題(2016YFC0701103) .

第一作者:薛素鐸,博士,教授,博士生導(dǎo)師,主要從事大跨空間結(jié)構(gòu)方面的研究,Email:sdxue@ bjut. edu. cn.

[引用本文] 薛素鐸,常海林,李雄彥,等. 抗拔型三維隔震支座力學(xué)性能研究[ J] . 建筑結(jié)構(gòu),2022,52( 5) :81-87.XUE Suduo,CHANG Hailin,LI Xiongyan,et al. Research on mechanical characteristics of anti-extraction three-dimensionalseismic isolation bearing[ J] . Building Structure,2022,52(5) :81-87.