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提出一种由灰铸铁与钢丝绳组成的新型串联型抗风拉索用于高层隔震结构,实现风荷载作用下协同铅芯橡胶支座抗风,减少铅芯橡胶支座数量;多遇地震作用下抗风拉索退出工作,减小隔震层的等效水平刚度,以解决隔震层同时协调抗风性能与隔震性能的问题。利用有限元分析软件ETABS对设置了抗风拉索的高层隔震结构进行风荷载作用与地震作用的时程分析。分析结果表明:风荷载作用时抗风拉索拉力远小于其极限拉力设计值,抵抗水平风荷载具有足够的安全储备;多遇地震作用下拉索拉力超出其极限拉力,拉索破坏退出工作;多遇地震作用下,抗风拉索的灰铸铁达到极限拉力而破坏,钢丝绳远没达到其极限拉力,震后返修只需要更换铸铁件即可,体现了经济性;多遇地震作用下全部拉索几乎同步进入极限拉伸状态,同步退出工作;拉索退出工作后,隔震性能指标达到设计目标,整体隔震效果得到提高。
A new series of wind-resistant cable made of gray cast iron and steel wire rope is proposed for the high-rise seismic isolation structure to achieve the wind resistance and reduce the number of lead-rubber bearings under wind load. The lower wind cable withdraws from work to reduce the equivalent horizontal stiffness of the isolation layer so as to solve the problem that the isolation layer can simultaneously coordinate the wind resistance performance and isolation performance. Using the finite element analysis software ETABS, the time-history analysis of the wind-induced load and seismic action on the high-rise isolated structure with wind-resistant cables is carried out. The results show that the wind-induced tension of wind-resistant cable is far less than the design value of the ultimate tensile force and the wind-resistant load has sufficient safety margin; the tensile force of the cable exceeds the ultimate tension when the earthquake occurs, Under the action of earthquake, the gray cast iron of the wind-resistant cable reaches the ultimate tensile force and destroys, the wire rope far reaches the ultimate tensile force, and the repaired after the earthquake only needs to replace the cast-iron part, which shows the economy; all the cables Almost simultaneously into the state of extreme tension, out of work simultaneously; cable exit work, shock isolation performance indicators meet the design goals, the overall isolation effect is improved.