升降温过程对钢结构节点动态响应影响研究

发布时间：2018-04-23 07:48

  本文选题：钢结构 + 升温　； 参考：《建筑结构》2017年S2期

【摘要】：针对钢结构在受火过程以及高温钢结构受到喷淋水急速冷却作用产生的冲击效应,通过建立H形钢结构计算模型,模拟分析了钢结构不同部位在升降温过程中梁柱节点附近区域的应力水平以及梁端轴力的变化特性。通过模拟结果可知:在受火的开始阶段缓慢增加,而当结构达到一定温度后梁端轴力和节点附近区域的应力都快速增加直到梁屈服。梁屈服后,其梁端轴力和节点区域附近的应力都快速降低,但直至升温到约800℃时,梁端仍然保持较大的轴力和一定的应力水平。而在喷水冷却降温过程中,梁端轴力快速降低直到零,随后又快速增加,直到达到最大拉力状态。而节点附近区域梁柱上的应力水平也是先降低后增加,而且冷却到环境温度时节点附近区域的应力要比升温过程的最大应力要高。同时,在对不同部位受火及冷却时对结构的轴力和应力水平也有影响,在梁腹板处受火并喷水冷却时梁端轴力最大,在梁下翼缘处受火及冷却时次之,在梁上翼缘受火及冷却时轴力最小。
[Abstract]:In view of the impact effect of steel structure in the course of fire and the rapid cooling of high temperature steel structure by spraying water, the calculation model of H-shaped steel structure is established. The stress level near the joint of Liang Zhu and the variation characteristics of axial force at the end of the beam are simulated and analyzed in the process of rising and cooling of different parts of steel structure. The simulation results show that the initial stage of the fire increases slowly, but when the structure reaches a certain temperature, the axial force at the end of the beam and the stress near the joint increase rapidly until the beam yield. After the beam yield, the axial force at the end of the beam and the stress near the joint region decrease rapidly, but the axial force and the stress level at the end of the beam are still large until the temperature rises to about 800 鈩，

本文编号：1791067