基于能量理论的混凝土梁裂缝口张开位移分析

混凝土结构在未使用之前往往已经存在裂缝,在外荷载作用下,混凝土内部微裂缝会不断产生、扩展,成为混凝土破坏的根源,因此有必要计算混凝土已有裂缝口的张开位移。应用基于能量理论的裂缝扩展准则和虚拟裂缝模型,通过编程来模拟混凝土梁混合裂缝的扩展,对于混凝土梁裂缝口张开位移的计算是有效的;切口深度增大时,裂缝口张开位移增大;弹性模量增大时,裂缝口张开位移减小,混凝土的抗裂性能得到加强。

The Energy-Based Numerical Analysis of Crack Opening Displacement in Concrete Beam

The crack in the concrete produce because of deformation of wet and dry,chemical shrinkage,and temperature deformation and other reasons before load.Under outside load effect,the cracks produce unceasingly,and expand,which becomes the origin that the concrete destroys.It is necessary therefore calculating crack opening displacement of concrete.According to energy criterion,fictitious crack as well as program,this paper explains the validity of this method by the example and points out the influence of notch depth and elastic modulus to the crack opening displacement.