摘要
双锥型变截面矩形钢管是指两端为锥型变截面、中间为等截面的组合矩形钢管构件。首先推导双锥型变截面矩形钢管的强度最不利破坏截面位置的判断公式,阐述双锥型变截面矩形钢管在压弯和压弯扭试验中不同加载方式下试件的破坏模式、塑性区发展过程及承载力结果,并结合大量有限元模型分析,进行不同弯压比下构件承载能力的比较。研究表明,双锥型变截面矩形钢管与等截面构件相比,在弯矩作用下具有更高的承载力,且塑性铰位置避开构件端节点,使整体结构延性得到增强。
Double-tapered rectangular steel tubes are composed of two tapered ends and a prismatic intermediate part. In this article, the formulas for determining the failure location of the double-tapered tubes are derived. Failure pattern, spreading of plastic zone and bearing capacity of double-tapered tubes are investigated under axial-flexural and axial-flexural-torsional loading experiments. Studies on the bearing capacity of members with different geometric parameters are carried out via FE model analyses. Investigations indicate that the bearing capacity of tubes is notably improved with two tapered ends, and the ductility of the whole structure can also be improved when plastic hinges do not occur at the nodal ends.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第9期8-16,53,共10页
China Civil Engineering Journal
基金
国家科技攻关计划课题(2004BA904B02)
北京市科技计划项目(Z000402804221)
国家自然科学基金资助项目(503780283)
教育部博士点基金资助项目(20050335091)
关键词
双锥型变截面
矩形钢管
试验研究
承载力
破坏位置
塑性区
double-tapered
rectangular steel tube
experimental study
bearing capacity
failure position
plastic hinge
