考虑风荷载作用特性的钢结构高层建筑竖向承重构件拟静力试验加载制度研究

STUDY ON LATERAL LOADING PROTOCOL FOR TESTING OF STEEL COLUMNS CONSIDERING WIND LOADING CHARACTERISTICS

  • 摘要: 结构构件拟静力加载试验的加载制度是获取构件在特定荷载下滞回性能的关键。为了探究结构构件在风荷载作用下的滞回行为以支撑开展结构性能化抗风设计,该研究将探索构建考虑风荷载作用特性的钢结构高层建筑竖向承重构件的拟静力试验加载制度。以钢结构高层建筑纤维截面有限元模型为基础,基于增量动力分析方法获取结构在风荷载作用下从开始振动到失效的响应时程数据,分析结构层间位移角时程的变化规律;通过雨流计数法对结构的层间位移角时程进行分解,对分解周期的均值和幅值进行统计分析,基于钢结构构件层间位移角的统计特征提出钢结构竖向承重构件在风荷载作用下的拟静力试验加载制度。该研究所提出的风荷载作用下的钢结构竖向承重构件加载制度获得的结构构件变形特征与实际高层钢结构建筑的响应特征具有高度一致性,可以支撑开展风荷载作用下钢结构高层建筑动力响应性能评估。

     

    Abstract: The loading protocol of quasi-static tests is critical for evaluating the performance of structural members. To investigate the hysteretic behaviour of structural members under wind loads to support the development of PBWD, this study proposes a lateral protocol for steel columns considering the characteristics of wind loads. A finite element model of a high-rise steel structure was established to obtain the structural response under wind loads and the drift ratio history of the structure was analyzed to understand its variation patterns. The drift ratio history was then decomposed into several cycles using rain-flow counting method, and statical analysis was performed on the cycle average and cycle range of the decomposed cycles. The lateral loading protocol for steel columns under wind loading was proposed based on the statistical characteristic of the drift ratio history. The characteristics of the proposed loading protocol of steel columns under wind loading are highly consistent with the response characteristics of actual high-rise steel structures, which can support the evaluation of the performance of high-rise steel buildings under wind loads.

     

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