【摘要】 研究了锈蚀钢筋几何参数(包括蚀坑形状、蚀坑位置、最大蚀坑深度、最大蚀坑个数、钢筋直径等)对钢筋力学性能影响的灵敏性;利用随机有限元的分析方法研究了锈蚀钢筋的应力分布情况.结果表明:对于相同直径的锈蚀钢筋,其力学性能主要取决于锈蚀钢筋表面的最大蚀坑深度;对于不同直径的锈蚀钢筋,可用锈蚀坑相对深度(蚀坑深度与钢筋直径之比)来反映钢筋的锈蚀程度,并建立了锈蚀钢筋的屈服荷载随锈蚀坑相对深度变化的规律;基于最大蚀坑深度的概率统计特性,得到了锈蚀钢筋最大应力分布的概率分布规律.更多还原

【Abstract】 Sensitivity analyses of the effects of the geometric parameters(such as the width,depth,location of the pit,rebar diameter,etc) of the corrosion pit on the mechanical properties of the rusty rebar were performed.Stochastic finite element method was applied to study the stress distribution of the rusty rebar.It is discovered that the maximum depth of the corrosion pit is the crucial factor for the mechanical property of the rusty rebar with the same diameter.For the rebars with different diameters,relative corrosion depth(ratio between the pit depth and the diameter of the rusty rebar) could be applied to describe the corrosion state of the rusty rebar.According to the mechanical analyses of the rusty rebar with different corrosion depth,relationship between the yield load of the rusty rebar and its relative corrosion depth is built up.Taken the maximum corrosion pit depth as the stochastic variable,the distribution of the maximum stress in the rusty rebar is then achieved.更多还原