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工程力学  2012 

翼缘削弱型钢梁的整体稳定性分析

DOI: 10.6052/j.issn.1000-4750.2011.03.0111

Keywords: 翼缘削弱型节点,整体稳定,能量法,临界荷载,等效折减刚度

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Abstract:

针对钢框架梁翼缘削弱式(RBS)节点梁的整体稳定性能进行了分析。采用能量法研究了不同荷载作用下RBS梁的整体稳定性能,将梁翼缘削弱段刚度采用等效折减刚度进行分析,得到RBS梁侧向弯扭失稳的临界荷载,并与等截面梁临界荷载进行对比。讨论了不同削弱参数下RBS梁的临界弯矩变化规律,并通过有限元数值计算验证了削弱参数对RBS梁弯扭失稳临界弯矩的影响。研究结果表明:RBS梁削弱参数整体对侧向弯扭失稳影响明显,其临界弯矩值较同尺寸的普通钢梁明显降低,工程设计中应考虑其不利影响;RBS随梁跨度的增加,削弱段局部刚度对整段梁的刚度影响作用减弱,当RBS梁的高跨比较小时,可以忽略削弱参数对临界弯矩的影响。

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