高温后钢筋混凝土梁的试验及有限元分析

Experimental investigation and FEM analysis on simple reinforced concrete beams after elevated temperature

为了研究升温时间、配筋率、冷却方式对高温后混凝土梁的力学性能的影响,对高温后16根混凝土梁进行了试验研究.研究结果表明:升温时间、配筋率对高温后梁的剩余承载力影响较大.基于混凝土和钢筋高温后基本的物理力学特性和理论计算模型,运用有限元的方法对高温后足尺钢筋混凝土梁的力学性能进行了数值分析,并与试验结果进行了比较,吻合良好.

Through experimental study on sixteen reinforced concrete beams after elevated temperature, the influences of heating time, reinforced ratio and different methods of cooling on the mechanics performance of members after elevated temperature are discussed in this paper. Experimental results show that the residual bearing capacity of reinforced concrete beams after elevated temperature are greatly influenced by heating time and reinforced ratio. Based on the mechanical behavior and theoretical calculation models of the material after elevated temperature put forward at present, the generalities of mechanical performance of full - scale reinforced concrete beams after elevated temperature are discussed by means of finite element method. The results of numerical calculation and those of experiment coincide well.