受火侵袭简支钢梁的冲击动力响应

The impact dynamic response of a simply-supported steel beam in fire

利用有限差分离散控制方程进行数值分析,研究了火侵袭时简支钢梁在阶跃载荷作用下的弹塑性动力响应。通过对不同应变率下和不同温度下的挠度曲线的分析,阐明了塑性应变率和温度对冲击载荷作用下梁挠度的影响,还给出了极限温度与载荷和应变率的定量关系。研究表明,塑性位移随应变率的增大而逐渐减小,却随温度的升高而逐渐增大。

Using the method of finite difference to discrete the governing equation, the elastic-plastic dynamic response of a simply-supported steel beam subjected to stepped loading and fire loading was investigated. The influence of plastic strain rate and temperature on the deflection of the beam was discussed through analyzing the deflection curves of the beam at different strain rates and different temperature. And the relations among limit temperature, load and strain rate are also given. The analysis presents that plastic displacement decreases with plastic strain rate increasing, and increases with temperature elevating.