摘要
在考虑自然火灾的基础上,进行了局部火灾作用下框架结构传热分析和非线性分析,对其温度分布规律、内力重分布规律和变形规律进行了研究。传热分析表明,受火过程中,受火构件截面平均温度较低。分析表明,受火过程中,框架经历了明显的内力重分布,大多数截面的内力都经历了一个先增大后减小的过程,受火构件的热膨胀是内力重分布的主要原因;自然火灾作用下,框架结构没有达到耐火极限状态。
Heat transfer analysis and mechanically nonlinear analysis of reinforced concrete frames subjected to local, natural fire are carried out in this paper, and the redistributions of internal forces and deformation are studied. The results of heat transfer show that the average temperatures of the sections of the heated members are lower during nature fire. The results show that the internal forces undergo an obvious redistributing course, and they increase at the beginning and decrease in the later, and the thermal expansion of the heated members are the main agitators; the analyzed frame doesnt reach fire -resistance limitation state during natural fire.
出处
《建筑技术开发》
2008年第6期8-10,共3页
Building Technology Development
基金
国家自然科学基金资助项目(50678097)
关键词
自然火灾
钢筋混凝土框架结构
内力重分布
热膨胀
Natural fire
Reinforced concrete frames
The redistribution of internal forces
Thermal expansion
