摘要
脱硝钢结构的框架-中心支撑抗侧力体系有足够抗风需要的结构弹性刚度,在地震作用下,支撑设计不致屈曲则地震力过大,导致结构内力和基础反力过大,结构和基础总体造价偏高。如允许支撑在设防烈度及罕遇地震时屈曲降低地震作用,则支撑屈曲后性能退化,影响它的耗能能力使得结构缺失必要的抗侧刚度,结构有倒塌的安全问题。本文通过脱硝工程框架-偏心支撑体系在钢结构中的应用,论证了该结构体系弹性阶段满足多遇地震下的抗侧刚度和变形能力需求,罕遇地震下其消能梁段在结构中发挥了“保险丝”作用,在主体结构发生屈服前耗散大量的地震能量,避免支撑发生屈服,实现了罕遇地震下主体结构必要的安全要求。偏心支撑体系允许耗能梁段屈曲耗能,较大的减小了设防烈度和罕遇地震下结构的内力和支座反力,可在造价较低下满足结构安全性和经济性需求,说明了在高烈度地区偏心支撑技术在脱硝钢结构上有较好的推广价值。
The frame-center braced system of SCR.steel structure has enough structural elastic stiffness to withstand wind.Be affected by the high seismic intensity,because of the brace does not buckle,the earthquake force is too large,resulting in the structure internal force and support reaction force too large and the overall structure and foundation cost is too high.If the brace is allowed to buckle and reduce the seismic effect in the case of fortification intensity and rare earthquakes,the performance of the brace after buckling will degrade,affecting energy dissipation capacity,resulting in the loss of necessary lateral stiffness of the structure,and the safety of the structure will collapse.Research on theoretical basis for eccentrically braced steel structure,in order to solve the contradiction between security and economy,this paper through the frame-eccentrically braced system in the practical application of steel structure,demonstrates the stage of elastic structural system satisfy the wind resistance and lateral stiffness and deformation capacity under severe earthquake demand,the energy dissipation beam section under severe earthquake in the structure of the“fuse”role,in the main structure with dissipation of earthquake energy,avoid brace to buckle,implements the guarantee subject structure under severe earthquake necessary safety requirements.Should be eccentrically braced system allows the energy dissipation beam section buckling,energy consumption reduced the fortification intensity and rarely met internal force and bearing reaction force of the structure under the earthquake makes the whole structure and the basis of low cost,meet the demand of the structural safety and economy at the same time,better illustrates the eccentrically braced steel structure in different types of steel structure in high-intensity region has better promotion value.
作者
余友华
陈驹
刘旭
黄家荣
胡亮
黄海涛
YU Youhua;CHEN Ju;LIU Xu;HUANG Jiarong;HU Liang;HUANG Haitao(Sichuan Key Laboratory of Clean Combustion and Flue Gas Purification,611731,Chengdu,China;Dongfang Electric Group Dongfang Boiler Co.,Ltd.,643001,Zigong,Sichuan,China;School of Architecture and Engineering,Zhejiang University,310030,Hangzhou,China)
出处
《东方电气评论》
2024年第4期67-73,共7页
Dongfang Electric Review
关键词
高烈度
偏心支撑
钢框架
抗侧体系
high seismic intensity
eccentrically braced
steel frame
anti-lateral system
