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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。
The overall stability of the beam-flange weakening (RBS) beam was analyzed. The energy stability of RBS beam under different loads was studied. The equivalent stiffness of the weakening section of the beam flange was analyzed by using the energy method. The critical load of the lateral bending and buckling instability of the RBS beam was obtained and compared with the critical load comparing. The variation law of the critical moment of RBS beam under different weakening parameters is discussed. The influence of the weakening parameter on the critical moment of RBS beam bending and buckling is verified by the finite element numerical simulation. The results show that: the weakening parameter of RBS beam has obvious influence on the lateral bending and buckling instability, its critical bending moment value is obviously lower than ordinary steel beam of the same size, and its adverse effects should be considered in the engineering design; The effect of local stiffness of weakening section on the stiffness of the whole beam is weakened. When the RST beam’s span ratio is small, the influence of weakening parameters on the critical moment can be neglected.