摘要
为改善铰接钢支撑受压稳定性从而提高受压承载力,将支撑设计成两端小中间大的变截面构件,通过增大支撑中部截面尺寸,使支撑在受压时塑性区域向两端外移,形成更大范围的塑性区,更有利于其在地震作用下的耗能。利用有限元分析方法研究工形截面、方钢管截面和圆钢管截面的变截面支撑的滞回性能。研究表明在保证支撑构件满足规范要求的宽厚比前提下,支撑长细比和楔率是影响变截面支撑滞回性能的主要因素,变截面支撑初始轴向刚度、承载能力、耗能性能随楔率增大而增大。
In order to strengthen the stability of the steel braced frame with pinned connections thus enhance the bearing capacity , the braces were designed in variable cross section which great in the middle and little at both ends . It has been noticed that the expansion of the middle section area making the braces plastic zone shifted towards both ends under the force of pressure . As a result , a larger plastic zone formed . T he I‐section , circular hollow and rectangular hollow variable cross‐section braces hysteretic behavior was investigated by finite element method . The results indicate that in braces width‐thickness ratio meets standard requirements , the main factors affecting variable cross‐section braces hysteretic behavior are the slenderness ratio and the w edge ratio . Wedge ratio is the larger , capacity of initial axial rigidity , carrying capacity and energy dissipation are the better .
出处
《黑龙江大学工程学报》
2015年第2期1-6,共6页
Journal of Engineering of Heilongjiang University
基金
黑龙江省教育厅科学技术研究项目(12531482)
黑龙江大学杰出青年科学基金资助项目(JCL201104)
中国博士后科学基金资助项目(20110491076)
关键词
钢支撑
变截面
滞回性能
steel brace
variable cross-section
hysteretic behavior
