高温下混凝土热-湿-气力学耦合数学模型  

A Coupled Thermo-Hygro-Mechanical Mathematical Model for Concrete at High Temperature

作　　者：张雪珊[1] 李焱淼[2] 

机构地区：[1]大连交通大学交通运输工程学院,辽宁大连116028 [2]大连交通大学数理系,辽宁大连116028

出　　处：《大连铁道学院学报》2005年第2期16-19,共4页Journal of Dalian Railway Institute

摘　　要：应用含有多相流体变形多孔介质的质量、动量和能量守恒方程,基于Gawin,Schrefler等的模型,建立了高温下混凝土热-湿-气力学耦合数学模型.考虑了混凝土多相系统中固体速度、饱和度乘蒸汽密度的空间梯度和孔隙压力空间梯度;并采用了广泛应用的描写非饱和土力学行为的力学本构和相应水力本构关系,为模型的进一步有限元分析打下了基础.Mass, momentum and energy conservation equations for the deforming porous medium unsaturated with muhiphase pore fluids are applied. Based on the existing model of Gawin and Schrefler, a coupled thermo-hygro-mechanical mathematical model is developed for concrete at high temperature. The model includes solid velocity, space grade of saturation with vapour density and space grade of porous pressure in concrete muhiphase system. Mechanical constitutive law widely used in describing unsaturated soils mechanical behaviour and corresponding hydro constitutive law are also applied, which provides a basis for further finite element numerical analysis.

关 键 词：混凝土 高温 热-湿-气力学耦合 数学模型 

分 类 号：TU528.01[建筑科学—建筑技术科学]