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（昆明有色冶金設(shè)計(jì)研究院股份公司， 昆明 650032）

［摘要］隔震分析中，通常假定隔震支座下支墩剛度足夠大且與大地剛接，而實(shí)際下支墩因自身變形及地基基礎(chǔ)的變形會(huì)發(fā)生轉(zhuǎn)動(dòng)。當(dāng)二者變形引起的轉(zhuǎn)動(dòng)過大時(shí)，對(duì)隔震結(jié)構(gòu)的影響不容忽視。分析了隔震支座下支墩轉(zhuǎn)動(dòng)對(duì)隔震結(jié)構(gòu)的影響，并提出了通過折減系數(shù)對(duì)隔震支座水平等效剛度進(jìn)行計(jì)算。結(jié)果表明：隔震支座下支墩轉(zhuǎn)動(dòng)會(huì)減小隔震支座水平等效剛度，其折減系數(shù)隨著隔震支座水平等效剛度及下支墩高度的增大而減小。

［關(guān)鍵詞］隔震支座； 下支墩轉(zhuǎn)動(dòng)； 基礎(chǔ)變形； 隔震結(jié)構(gòu)

中圖分類號(hào)：TU352-1+2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)14-0116-04

Influence analysis of rotation of lower pier under isolation bearing on isolated structure

LI Yisheng, JIANG Li, XU Weihong

(Kunming Engineering & Research Institute of Nonferrous Metallurgy Co., Ltd., Kunming 650032, China)

Abstract:In the analysis of isolation, it is usually assumed that the rigidity of the lower pier under the isolation bearing is large enough and rigid connected with the earth, but in fact, the lower pier will rotate due to its own deformation and the deformation of the foundation. When the rotation caused by the two deformations is too large, the influence on the isolated structure cannot be ignored. The influence of the rotation of the lower pier under the isolation bearing on the isolation structure was analyzed, and it was proposed to calculate the horizontal equivalent stiffness of the isolation bearing through the reduction coefficient. The results show that the rotation of the lower pier of the isolation bearing will reduce the horizontal equivalent stiffness of the isolation bearing, and the reduction coefficient will decrease with the increase of the horizontal equivalent stiffness of the isolation bearing and the height of the lower pier.

Keywords:isolation bearing; rotation of lower pier; foundation deformation; isolation structure

作者簡介：李奕生，碩士，工程師，Email: dr.leeyes@foxmail.com。