屈曲约束支撑在某混凝土结构薄弱层中的应用
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摘要
淮安开元国际大酒店属于超限高层结构。介绍了工程的特点及结构布置情况,针对结构竖向不规则性的特点,设置屈曲约束支撑对显著薄弱层予以加强。采用静力推覆分析方法和时程分析法分析了结构在设置不同刚度和形式的屈曲约束支撑前后的弹塑性性能。结果表明,在小震作用下,屈曲约束支撑处于弹性状态,为结构薄弱层提供支撑刚度,满足规范的要求;在罕遇地震作用下,屈曲约束支撑达到屈服状态,为结构提供耗能能力,改善了抗震性能。不同应力水平下的屈曲约束支撑对主体构件塑性铰出现的影响有所不同,同时滞回特性也有所差别。
Huai'an Kaiyuan International Hotel is a complex high-rise building beyond code limit.This paper presents the main features and design arrangement of this structure.Due to the irregular features in vertical direction,buckling restrained braces(BRB)are applied to strengthen the weak stories.Pushover analysis and elasto-plastic time history analysis are carried out to compare the inelastic performance of the structure which is reinforced by BRBs in different stiffness and forms.The results show that BRBs are in elastic state when subjected to frequent earthquake,and provide stiffness for the weak stories to meet the requirements in the seismic design code.While in rare earthquakes,BRBs reach postyielding state,and provide additional energy dissipation capacity for the main structure.Thus the seismic behavior of the entire structure is improved.Under different stress levels,the appearance of plastic hinges is not the same,and also shows different hysteresis characteristics.
引文
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