基于ATENA的高强混凝土在三轴围压荷载作用下的受力性能研究
首发时间:2020-01-10
摘要:本文采用ATENA有限元软件对高强混凝土(以fcu=111.6MPa为例)在箍筋约束作用下受力性能进行了有限元模拟,对约束混凝土中任一点受力状态进行建模分析,将箍筋约束等效为弹簧约束,分析了约束混凝土在三轴围压荷载下的受力和变形行为。共开展25个模型的有限元分析,模型变化参数包括螺旋箍筋屈服强度、混凝土的体积配箍率和配箍特征值。分析结果表明:箍筋屈服强度不变情况下,增大试件体积配箍率可有效改善试件变形能力,提高混凝土的承载能力;体积配箍率相同情况下,增加箍筋屈服强度可提高混凝土承载力,有效改善混凝土的变形能力;配箍特征值相同情况下,提高箍筋屈服强度会导致混凝土承载力降低,不利于混凝土变形。
关键词: 结构工程 高强混凝土 螺旋箍筋 三轴约束混凝土 有限元分析 高强箍筋
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A Case Study on the Behavior of High Strength Concrete under Three-Axis Confining Load Using ATENA Platform
Abstract:In this paper, the ATENA platform was used to model the mechanical behavior of high-strength concrete (fcu=111.6MPa, for example) under the constraint of spiral annuli, and the pointwise state of the confined concrete was analyzed. The hoop restraint is equivalently substituted by spring constraints, which simplify the modeling process. . A finite element analysis of 25 models were carried out with varying yield strengths of the spiral stirrup, volumetric hoop ratios and hoop characteristic values of the concrete. The results indicate that when the yield strength of the stirrup is kept constant, increasing volume hoop ratio can effectively improves the deformability and the strength capacity of the confined concrete;when the volumetric hoop ratio is kept constant, increasing yield strength of spiral stirrup can effectively improve the deformability of concrete; when the hoop characteristic value is kept constant, increasing the yield strength of the spiral stirrup would result in a decrease of concrete strength capacity, which is harmful to concrete deformation.
Keywords: structural engineeering high-strength concrete spiral stirrup tri-axially constrained concrete finite element analysis high-strength stirrup
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基于ATENA的高强混凝土在三轴围压荷载作用下的受力性能研究
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