帶新型抗風拉索高層隔震結構抗風與隔震性能研究*
周云，馮啟浩，盧德輝
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（廣州大學土木工程學院， 廣州 510006）
［摘要］提出一種由灰鑄鐵與鋼絲繩組成的新型串聯(lián)型抗風拉索用于高層隔震結構，實現(xiàn)風荷載作用下協(xié)同鉛芯橡膠支座抗風，減少鉛芯橡膠支座數(shù)量；多遇地震作用下抗風拉索退出工作，減小隔震層的等效水平剛度，以解決隔震層同時協(xié)調抗風性能與隔震性能的問題。利用有限元分析軟件ETABS對設置了抗風拉索的高層隔震結構進行風荷載作用與地震作用的時程分析。分析結果表明：風荷載作用時抗風拉索拉力遠小于其極限拉力設計值，抵抗水平風荷載具有足夠的安全儲備；多遇地震作用下拉索拉力超出其極限拉力，拉索破壞退出工作；多遇地震作用下，抗風拉索的灰鑄鐵達到極限拉力而破壞，鋼絲繩遠沒達到其極限拉力，震后返修只需要更換鑄鐵件即可，體現(xiàn)了經(jīng)濟性；多遇地震作用下全部拉索幾乎同步進入極限拉伸狀態(tài)，同步退出工作；拉索退出工作后，隔震性能指標達到設計目標，整體隔震效果得到提高。［關鍵詞］高層隔震結構; 抗風拉索; 抗風性能; 隔震性能中圖分類號：TU318.2 文獻標識碼：A 文章編號：1002-848X(2016)11-0077-08
Study on wind-resistant and isolation performance of high-rise isolated structure with new wind-resistant cableZhou Yun, Feng Qihao, Lu Dehui（School of Civil Engineering, Guangzhou University, Guangzhou 510006, China）Abstract: A new series type wind-resistant cable (WRC) composed of gray cast iron and steel wire rope was proposed for high-rise isolated structure. WRC can resist wind in coordination with lead rubber bearing (LRB) under the action of wind load to decrease number of lead rubber bearings. WRC quits work under frequent earthquake to reduce equivalent horizontal stiffness of the isolation layer and solve the problem of isolation layer in coordination of the wind resistant performance and isolation performance. The finite element analysis software ETABS was used to conduct the time-history analyses of high-rise isolated structure with WRC under the wind load action and seismic action. Analysis results show that under the wind load, tensile force of WRC is far less than the design value of ultimate tensile force, so it has sufficient safety margin against horizontal wind load; under frequent earthquake, WRC force is beyond the ultimate tensile force and the cable quits work; under frequent earthquake, gray cast iron of WRC reaches ultimate tensile force and fails, but steel wire rope is far beyond the ultimate tensile force, so post-earthquake repair only needs replace cast iron parts, which embodies economy; under frequent earthquake, all cables are almost simultaneously into the ultimate tensile state and synchronous exit. When the cables are out of function, indexes of isolation performance reach the design target and overall vibration isolation effect is improved.Keywords: high-rise isolated structure; wind-resistant cable; wind-resistant performance; isolation performance
*教育部“創(chuàng)新團隊發(fā)展計劃”（IRT13057），廣東省自然科學基金研究團隊項目(8351009101000001)，廣州市高校“羊城學者”科研項目(10A026S)。作者簡介：周云，博士，教授，Email：zhydxs@163.com。
