Abstract In the context of increasingly required evaluation of existing critical concrete infrastructures, prediction of the long-term behaviour can sometimes be very sensitive to the proper consideration of physical phenomena that occur during the first weeks during construction. For the specific example of mass concrete structures, it is important to consider the heat of hydration process and the possible development of thermally induced stresses and cracking at an early age. Consideration of the early age to the long-term time spectrum to recreate the history of stress/crack development is a challenging task in the field of numerical simulation of concrete structures and involves a consideration of multiple non-linear and physical phenomena. This work constitutes a continuation of previous works involving multi-physical simulation of concrete structures using the explicit finite element solver algorithm, which is known for its efficiency in solving highly nonlinear problems compared to the conventional implicit solver. A simple and innovative framework was developed in previous studies and involves the decomposition of strain into mechanical, thermal, creep, shrinkage and a coupling chemo-physical strain. This work focuses on the development of a simple and feasible computational framework for considering the creep in the specific field of mass concrete structures. Verification and validation examples are considered at the material and element levels. Application at the structural level on a new numerical benchmark demonstrates the feasibility of the approach and the efficiency of the developed computational framework.

中文翻译：

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使用显式有限元方法对大体积混凝土结构进行多物理模拟的蠕变建模

摘要 在对现有关键混凝土基础设施越来越需要评估的背景下，长期行为的预测有时对正确考虑施工期间最初几周发生的物理现象非常敏感。对于大体积混凝土结构的具体示例，重要的是要考虑水化过程的热量以及早期热致应力和开裂的可能发展。考虑早期到长期时间谱以重建应力/裂缝发展的历史是混凝土结构数值模拟领域的一项具有挑战性的任务，涉及多种非线性和物理现象的考虑。这项工作是先前工作的延续，涉及使用显式有限元求解器算法对混凝土结构进行多物理模拟，与传统的隐式求解器相比，该算法以其在解决高度非线性问题方面的效率而闻名。先前的研究开发了一个简单而创新的框架，涉及将应变分解为机械、热、蠕变、收缩和耦合化学物理应变。这项工作的重点是开发一个简单可行的计算框架，以考虑大体积混凝土结构特定领域的蠕变。在材料和元素级别考虑验证和验证示例。