论文部分内容阅读
提出计算高温和局部荷载作用下短粗热轧钢板的极限强度的分析模型。该局部荷载可能出现在火灾中钢框架结构梁柱连接的受压区,由集中荷载所产生。建模中假定翼缘上的理想塑性铰会导致腹板屈服,计算没有考虑板的局部屈曲。根据温度区域和连接受压区的长度提出两种可能的失效机制,这与周边温度升高时构件的失效屈服不同。基于本文提出的分析模型,对一个典型连接件进行参数研究,归纳不同的热梯度和局部荷载作用长度下腹板极限强度的变化。分析结果表明:在对钢结构进行防火设计时,必须考虑到连接件在高温下的反应,才能提高建模的准确性。
The analytical model for calculating the ultimate strength of short and thick hot-rolled steel under high temperature and local load is proposed. This local load may appear in the compression zone of the beam-column connection of the steel frame structure in a fire, resulting from a concentrated load. The model assumes that the ideal plastic hinge on the flange will cause the web to yield, and the calculation does not consider the local buckling of the panel. According to the temperature region and the length of the connection pressure zone, two possible failure mechanisms are proposed, which are different from the failure yield of the component when the ambient temperature rises. Based on the analysis model presented in this paper, the parameters of a typical connector are studied and the variation of the ultimate strength of the web under different thermal gradients and local loads is summarized. The analysis results show that when designing the fire protection of steel structure, the response of the connector must be taken into consideration at high temperature to improve the modeling accuracy.