Kuryłowicz-Cudowska Aleksandra
Department of Mechanics of Materials and Structures, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland.
Materials (Basel). 2019 Sep 22;12(19):3089. doi: 10.3390/ma12193089.
The paper deals with a concept of a practical computation method to simulate the temperature distribution in an extradosed bridge deck. The main goal of the study is to develop a feasible model of hardening of concrete consistent with in-situ measurement capabilities. The presented investigations include laboratory tests of high performance concrete, measurements of temperature evolution in the bridge deck and above all, numerical simulations of temperature field in a concrete box bridge girder. A thermal conductivity equation in the author's program, using finite difference method has been solved. New approach for identification of the model parameters and boundary conditions (heat transfer coefficients) has been proposed. The numerical results are verified by means of a wide set of experimental tests carried out on three stages of the extradosed bridge studies. A high agreement between the concrete temperature distribution in the time and space domain was obtained. The temperature history of concrete hardening, supplemented with maturity method equations, made it possible to estimate an early-age compressive strength of the cast-in-place concrete. The proposed solution could be applied in a Structural Health Monitoring system for concrete objects.
本文探讨了一种用于模拟矮塔斜拉桥桥面板温度分布的实用计算方法的概念。该研究的主要目标是开发一个与现场测量能力相一致的可行的混凝土硬化模型。所开展的研究包括高性能混凝土的实验室试验、桥面板温度演变的测量，最重要的是，对混凝土箱形桥梁梁体温度场的数值模拟。作者程序中使用有限差分法的热传导方程已得到求解。提出了识别模型参数和边界条件（传热系数）的新方法。数值结果通过在矮塔斜拉桥研究的三个阶段进行的大量实验测试得到验证。在时间和空间域内混凝土温度分布之间获得了高度一致性。混凝土硬化的温度历程，辅以成熟度法方程，使得估算现浇混凝土的早期抗压强度成为可能。所提出的解决方案可应用于混凝土结构的结构健康监测系统。
