柱脚连接对柔性框架结构稳定性的影响

由冷成型钢加工而成的仓储货架经常被安装在楼板和柱子间没有任何实质连接的平坦楼板上。在过去的十年内,进行了许多钢及组合梁柱节点的研究,但是对于能够确保结构和基础连接的柱脚的研究则很少。柱脚的性能会对仓储货架的结构反应有很大的影响。本文考察了柱脚连接的性能以及它们对于诸如仓储货架一样的柔性框架结构的整体稳定性的影响。识别了楼面连接从完全固接到铰接的转换条件。这些转换条件主要取决于荷载的特性以及结构的几何尺寸。通过采用一个计算机代数通用程序来计算承载力,对一个柔性门式刚架柱脚的转换条件进行了理论的研究。介绍了验证理论结果的一个试验方案。结果表明,理论值和试验值具有很好的相关性。还采用有限元分析对理论结果进行了验证。另外,还使用有限元分析的方法对多跨柔性框架结构的转换条件进行了推导。

The Effects of Column Base Connectivity on the Stability of Slender Frame Structures

Storage racks fabricated from cold-formed sections are often installed on flat floors without any substantial connection between the floor and the column.Much research has been devoted during the last decade to the study of the beam-to-column steel and composite joints but less to column bases,which ensure the link between the structure and the foundation.The behaviour of column bases significantly influences the structural response of the storage racks.This paper investigates the behaviour of column base connections and their influence on the overall stability of slender frame structures such as storage rack.It identifies the conditions for the transition of the floor connection from acting as fully fixed to acting as a pinned connection.The conditions depend upon the nature of the loading as well as on the geometry of the structure.The transition conditions at the column bases of a slender portal frame are explored theoretically using a computer algebra package to predict the carrying capacity.An experimental programme to validate the theoretical results is described.The results show good correlation between theoretical and experimental predictions.The theoretical results have also been verified by the use of finite element analysis.Transition conditions for multi-bay slender frame structures are derived using finite element analyses.