Comparison of Analytical Methods for Estimation of Early-Age Thermal-Shrinkage Stresses in RC Walls
Comparison of Analytical Methods for Estimation of Early-Age Thermal-Shrinkage Stresses in RC Walls
复制标题
估算 RC 墙早期热收缩应力的分析方法比较
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A. Knoppik
中科院分区：
文献类型：
--
作者：
B. Klemczak;A. Knoppik
摘要早期混凝土构件由于温度和湿度的耦合变化而引起的体积变化导致应力的形成。如果一个约束存在于沿着已浇筑的新混凝土构件的老混凝土的接触面上，则产生的应力主要来自约束。在工程实践中，可以区分各种外部约束的混凝土构件，例如在旧基础上浇筑的罐壁或桥台，其中早期开裂可能危及其耐久性或功能性。因此，多年来一直在发展的方法来预测早期的应力和开裂风险的外部约束混凝土元件受到早期的热湿效应。本文介绍了最公认的分析方法的比较研究：EC2中提出的方法，ACI委员会207提出的方法和在吕勒贝克理工大学开发的方法。
Abstract The volume changes caused by coupled temperature and moisture variations in early-age concrete elements lead to formation of stresses. If a restraint exists along the contact surface of mature concrete against which a new concrete element has been cast, generated stresses are mostly of a restraint origin. In engineering practice a wide range of externally restrained concrete elements can be distinguished such as tank walls or bridge abutments cast against an old set foundation, in which early-age cracking may endanger their durability or functionality. Therefore, for years methods were being developed to predict early-age stresses and cracking risk of externally restrained concrete elements subjected to early-age thermal-moisture effects. The paper presents the comparative study of the most recognised analytical approaches: the method proposed in EC2, the method proposed by ACI Committee 207 and the method developed at the Luleå University of Technology.