火灾下普通混凝土结构的挠度计算简化方法

挠度是考查火灾下结构性能的一个重要指标,目前都是采用有限元分析的方法或者根据弯矩-曲率关系编程计算火灾下结构的挠度反应,其过程十分烦杂,尚无简化的计算方法.为了减少计算工作量,且便于应用,有必要提出一种火灾下结构挠度的简化计算方法.提出了受火结构截面等效刚度和截面等效温度计算原则,推导了火灾下正截面极限承载力的实用计算法,给出了火灾下混凝土结构挠度的简化计算方法,经比较,计算值与实测值吻合得较好.

Simplified calculation of deflection of common concrete structures under fire

How to determine the deflection of structures in fire is an important matter. The deflection of structures was (usually) calculated by the finite element method or by the method of moment-curvature relationship, and the calculated process is complex. In order to reduce the calculated process, and make it ease to use in design, it is need to find a simple method. In this paper, the section equivalent rigidity and equivalent temperature calculation principle were presented. The formula to calculate the ultimate limit states of reinforced concrete structures subjected to fire was put forward. The method calculating the deflection of reinforced concrete was established. The feasibility was examined with this method.