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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

发表时间:2020-07-01  浏览量:212  下载量:24
全部作者: 陈亚朋,徐嘉
作者单位: 大连理工大学土木工程学院
摘 要: 采用ATENA有限元软件对高强混凝土(以fcu=111.6 MPa为例)在箍筋约束作用下的受力性能进行了有限元模拟,对约束混凝土中一点的受力状态进行建模分析,并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:在箍筋屈服强度不变的情况下,增大试件体积配箍率可有效改善试件的变形能力,提高约束混凝土的承载能力;在体积配箍率相同的情况下,增加箍筋屈服强度可提高混凝土的承载力,有效改善混凝土的变形能力;在配箍特征值相同的情况下,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;约束混凝土峰值应力与横向约束力之间呈明显线性关系。
关 键 词: 土木建筑结构;高强混凝土;螺旋箍筋;三轴约束混凝土;有限元分析
Title: A case study on the mechanical behavior of high-strength concrete under three-axis confining load using ATENA
Author: CHEN Yapeng, XU Jia
Organization: School of Civil Engineering, Dalian University of Technology
Abstract: In this paper, the ATENA finite element software was used to simulate the mechanical behavior of high-strength concrete (fcu=111.6 MPa, for example) under the constraint of stirrup, and the stress state at one point of the confined concrete was modeled and analyzed. The stirrup constraint was equivalent to the spring constraint, the stress and deformation behavior of the confined concrete under tri-axially confining load were analyzed. A finite element analysis of 25 models was carried out with model parameters including yield strengths of the spiral stirrup, volumetric stirrup ratios and stirrup characteristic values of the concrete. The results indicate that, when the yield strength of the stirrup is constant, increasing the volumetric stirrup ratio of the specimen can effectively improve its deformability and increase the strength capacity of the confined concrete. When the volumetric stirrup ratio is constant, increasing the yield strength of the stirrup can increase the strength capacity and effectively improve the deformability of concrete. When the stirrup characteristic value is constant, increasing the yield strength of the stirrup can result in a decrease of the concrete’s strength capacity, which is harmful to the concrete deformation. There is a clear linear relationship between the confined concrete peak stress and lateral stress.
Key words: civil construction structure; high-strength concrete; spiral stirrup; tri-axially constrained concrete; finite element analysis
发表期数: 2020年6月第2期
引用格式: 陈亚朋,徐嘉. 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[J]. 中国科技论文在线精品论文,2020,13(2):188-195.
 
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