摘要
基于退化壳原理,考虑火灾下板壳截面的不均匀温度场分布而引入分层模型,同时在每分层上考虑材料在不同温度下的热力弹塑性本构关系,建立了火灾下钢筋混凝土板壳结构的有限元数值计算模型。另外,通过全拉格朗日方法考虑了大位移的几何非线性影响。最后通过一钢筋混凝土板在高温下的试验进行了验证,并分析了配筋率和保护层厚度的影响。结果表明:提出的火灾下钢筋混凝土壳单元数值计算模型的计算结果与试验结果吻合较好,可以用来分析火灾下钢筋混凝土框架结构楼板的反应。
Based on the degenerated shell theory, a finite element numerical model is proposed to analyze the behavior of the reinforced concrete slabs exposed to fire. The non-uriform temperature distribution across the section of the slab is considered. The temperature dependent thermal-elastic plastic material model is introduced in each layer through the layered model. The geometric nonlinearity due to large displacement is taken into consideration through Total Lagrange approach. The proposed model is validated by a fire experimental test on a reinforced concrete slab and the effects of parameters including the ratio, of reinforcement and the thickness of the concrete cover are analyzed. The results show that the predictions agree well with the experimental results and the proposed model can be used to analyze the response of the reinforced concrete slabs under fire.
出处
《工程力学》
EI
CSCD
北大核心
2008年第3期107-112,共6页
Engineering Mechanics
基金
国家"十一五"支撑计划项目(2006BAK01A02-09)
关键词
钢筋混凝土板壳
火灾反应
分层模型
薄膜作用
非线性分析
reinforced concrete slab
fire response
layered model
membrane action
nonlinear analysis
