冷弯型钢结构基于性能的抗震设计方法研究

PERFORMANCE-BASED SEISMIC DESIGN METHOD FOR COLD-FORMED STEEL STRUCTURES

  • 摘要: 为研究冷弯型钢结构基于性能的抗震设计方法,对国内外284个冷弯型钢剪力墙的试验现象和数据进行统计分析,将其性能划分正常使用、立即使用、生命安全以及防止倒塌四个水平,并对不同性能水平作用下的层间位移角限值予以量化。根据冷弯型钢结构的特点,将多自由度体系转化为等效单自由度体系,选取第一振型作为水平位移模式,结合等效弹塑性位移反应谱,得到结构的层间剪力和剪力墙布置参数,最终提出冷弯型钢结构直接基于位移的抗震性能设计方法和设计步骤。根据建筑场地类别和设计地震分组选取五条地震波对冷弯型钢结构进行动力时程分析,其结果表明:冷弯型钢结构在不同地震作用下的最大层间位移角均满足该文建议的层间位移角限值,这表明了基于位移的抗震设计方法的有效性。同时算例分析结果表明,冷弯型钢结构基于性能的抗震设计方法简单实用,可为后续理论研究和工程应用提供参考。

     

    Abstract: In order to investigate the performance-based seismic design method of cold-formed steel (CFS) structures, statistical analysis was conducted on experimental phenomena and data of 284 CFS structures at home and abroad. Their performance was divided into four levels: normal occupancy, immediate occupancy, life safety and collapse prevention, and the inter-story drift ratio limits corresponding to different performance levels were quantified. Based on the characteristics of CFS structures, the multi degree of freedom system was transformed into an equivalent single degree of freedom system. The first vibration mode was selected as the horizontal displacement mode, and combined with the equivalent elastic-plastic displacement response spectrum, the shear force and layout parameters of the shear wall of the structure were obtained. Finally, a displacement-based seismic design method and procedure for CFS structures were proposed. Five seismic waves were selected for the dynamic time-history analysis of CFS structures according to the Site category and design earthquake grouping. The results show that the peak inter-story drift ratio of CFS structures under different earthquake actions meets the inter-story drift ratio limit recommended in this paper, indicating the effectiveness of displacement-based seismic design method. Meanwhile, case analysis shows that the performance-based seismic design method for CFS structures is simple and practical, providing reference for subsequent theoretical research and engineering applications.

     

/

返回文章
返回