火灾下钢筋混凝土板的非线性有限元分析  

Nonlinear finite element analysis of reinforced concrete slabs in fire

作　　者：王勇[1,2] 董毓利[3] 袁广林[1] 王耀[4] 

机构地区：[1]中国矿业大学江苏省土木工程环境灾变与结构可靠性重点试验室,徐州221008 [2]中国矿业大学深部岩土力学与地下工程国家重点试验室,徐州221008 [3]华侨大学土木工程学院,厦门361000 [4]北京工业大学建筑工程学院,北京100124

出　　处：《计算力学学报》2014年第3期390-395,共6页Chinese Journal of Computational Mechanics

基　　金：中央高校基本科研业务费专项资金(2014QNA78);教育部博士学科点专项科研基金(20120095110027);国家自然科学基金(51178143)资助项目

摘　　要：根据大挠度板单元理论,对常温钢筋混凝土简支板的力学性能进行数值分析,验证了模型及程序的可靠性。在此基础上,提出双轴受压瞬态热应变模型和瞬态模量的概念,利用温度场模拟结果,对钢筋混凝土简支板火灾行为进行了数值模拟,并研究了不同准则下板的耐火极限。结果表明,数值计算结果与试验曲线吻合较好,验证了瞬态热应变模型的有效性;与其他准则相比,基于温度准则所得的耐火极限值相对保守。Based on the flat shell theory,the program has been developed to analyze the two-way reinforced concrete slabs at ambient temperature,and the efficiency of the model was verified in the analysis.In addition,this paper proposed the transient strain model of concrete with transient modulus under the bi-axial stress state.According to the developed temperature program,the proposed model was used to predict the fire behavior of two-way reinforced concrete slabs,and the fire resistance of the slab based on different criteria has been studied in the paper.The results show that the predictions agree well with the experimental results,and demonstrate the validity of the transient strain model.Compared with other criteria,the fire resistance value based on the temperature criterion is relatively conservative.

关 键 词：钢筋混凝土板 热弹塑性 瞬态热应变 瞬态模量 耐火极限 

分 类 号：O343.6[理学—固体力学] O242.21[理学—力学]