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基于增量法及截面二维网格的桥梁应力重分布分析

, PP. 93-98

Keywords: 桥梁工程,空间梁单元,应力增量,二维网格,初应变,应力重分布

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Abstract:

由于混凝土的收缩徐变特性及结构的内外约束,桥梁存在一定程度的应力重分布。为定量分析桥梁应力重分布,采用空间梁单元,首先对单元截面混凝土部分进行二维三角形网格自动剖分,配筋按其在截面上的实际位置和实际截面形状考虑,不需进一步剖分,单根普通钢筋横截面或一束预应力钢筋横截面为一个剖分块。将桥梁的建造和使用过程划分为若干阶段,根据前面各个阶段单元截面每个剖分块形心处的应力增量,计算在当前阶段时段内前面各个阶段每个剖分块形心点处应力增量产生的自由初应变,再考虑截面内部约束计算得到截面参数ε0,φy,φz,据此计算单元等效节点荷载和自应力,然后考虑结构外部边界约束计算次应力,本阶段的自应力、次应力及由于其他荷载因素产生的应力之和为本阶段应力增量,依此法循环计算所有阶段得到每个阶段的应力增量和总量,最终得到每个阶段的应力重分布数值,该方法可考虑截面分多次形成的情况。算法在桥梁通用分析软件BRanalysis中成功实现。

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