Early‐age cracking due to restraint: Laboratory and field investigations on the predictive capacity of the simplified method in Annex D of the future EC2

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Structural Concrete Pub Date : 2024-05-27 DOI:10.1002/suco.202400173

Antonia Menga, Jean‐Michel Torrenti, Terje Kanstad, Anja Birgitta Estensen Klausen

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Abstract

The Annex D of the future EC2 draft gives guidance on the evaluation of early‐age cracking of large structures due to restraint. In case of restrained conditions, compressive stresses are firstly generated in massive structures due to temperature increase, then tensile stresses are generated due to temperature decrease and shrinkage. Due to these tensile stresses, there is a risk of cracking which may be evaluated by the simplified method in Annex D. This method is currently verified against laboratory tests performed in the temperature‐stress testing machine and field cases on restrained concrete elements. The laboratory verification consisted of five approaches to consider different available input (modeled, assumed, or measured). The field investigation focused on the relation between the calculated cracking risk and the observed damage. The results show that the method has very good accuracy and captures with reasonable simplicity the mechanisms and the relations between the parameters involved.

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受约束引起的早期开裂：对未来 EC2 附件 D 中简化方法预测能力的实验室和实地调查

未来的 EC2 草案附件 D 为评估大型结构因约束而产生的早期开裂提供了指导。在约束条件下，大型结构首先会因温度升高而产生压应力，然后会因温度降低和收缩而产生拉应力。由于这些拉应力，存在开裂的风险，可采用附件 D 中的简化方法进行评估。目前，该方法已通过温度应力试验机进行的实验室试验和受约束混凝土构件的现场案例进行了验证。实验室验证包括五种方法，以考虑不同的可用输入（模型、假设或测量）。现场调查的重点是计算的开裂风险与观察到的损坏之间的关系。结果表明，该方法具有很高的准确性，并以合理的简单性捕捉到了相关参数之间的机理和关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.