Lateral buckling of eccentrically braced RHS columns
Lateral buckling of eccentrically braced RHS columns
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DOI：
10.1016/j.tws.2011.07.006
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发表时间：
2011-11
影响因子：
6.4
通讯作者：
Lei Zhang;G. Tong
中科院分区：
文献类型：
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作者：
Lei Zhang;G. Tong
矩形空心截面柱是农业温室结构中广泛使用的柱。为了提高这些柱对平面外屈曲破坏的抵抗力，经常采用支撑系统，通常由支撑跨组成，支撑跨包含间隔一定数量的跨度的双层X形支撑和连接同一行所有柱的中间高度部分的水平杆。水平杆为两个相邻支撑跨之间的柱提供横向支撑。由于易于安装和外表面处存在玻璃，水平杆通常使用搭接接头连接到建筑边缘处的柱（侧柱）的内表面，导致侧柱由水平杆偏心支撑。本文对矩形钢管混凝土偏心支撑柱的屈曲荷载、破坏形态、支撑偏心距、支撑刚度以及它们之间的关系进行了研究。对于规范化的临界支撑偏心距和屈曲荷载，本文也提供了精度良好的简单近似值，在实际设计中只需手工计算即可。按照本研究中提出的程序，给出了温室建筑侧柱的工作示例。
Rectangular hollow section (RHS) is widely used as columns of agricultural greenhouse constructions. To enhance the resistance of these columns against the out-of-plane buckling failure, the bracing system is frequently adopted, typically composed of the bracing spans containing a two-layer x-brace at intervals of a number of spans and a horizontal bar connecting the mid-height sections of all columns of the same row. The horizontal bar provides the lateral brace to the columns between two adjacent bracing spans. Due to ease of installation and existence of glass at the outer face, the horizontal bar is usually connected to the inner face of the columns at the edges of the construction (side columns) using the overlapped joints, leading to the side columns being eccentrically braced by the horizontal bar. The present paper carried out an investigation into behavior of the eccentrically braced RHS columns, including the buckling load, failure mode, bracing eccentricity, bracing stiffness and the relationships between. Simple approximations of good accuracy are also provided for the normalized critical bracing eccentricity and buckling load, with which the hand-calculation method is only necessary in practical design. A worked example is given for side columns in greenhouse constructions following the procedure presented in this study.