Coupled thermo‐hydro‐mechanical analysis of reinforced concrete beams under the effect of frost damage and sustained load
Coupled thermo‐hydro‐mechanical analysis of reinforced concrete beams under the effect of frost damage and sustained load
复制标题
冻害和持续荷载作用下钢筋混凝土梁的热-水-力耦合分析
DOI：
10.1002/suco.202100170
复制
发表时间：
2021-07
影响因子：
3.2
通讯作者：
F. Gong;Zhao Wang;J. Xia;K. Maekawa
中科院分区：
文献类型：
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作者：
F. Gong;Zhao Wang;J. Xia;K. Maekawa
冻害是冷湿环境下钢筋混凝土结构的一个重要劣化参数，它通常与自重、不动重等持续荷载同时作用。本文对钢筋混凝土梁在冻害和持续荷载耦合作用下的结构性能进行了热-水-力学模拟。这种模拟方法从基于多组分物质的微观材料冻害模型开始，到基于宏观结构的钢筋混凝土梁性能评估。在此基础上，模拟了钢筋混凝土梁模型在冻害作用和持续荷载作用下的损伤累积过程。然后，在弯曲荷载作用下，研究了遭受耦合损伤的钢筋混凝土梁的结构性能。实验室实验结果与数值模拟结果吻合较好。为了进一步评价钢筋布置、水灰比等参数对结构劣化的影响，还进行了参数研究。最后，根据设计规范的规定，采用损伤区域的等效冻害强度计算钢筋混凝土梁的抗弯承载力，为验证或预测钢筋混凝土梁在冻害和持续荷载耦合作用下的性能提供了一种简便的方法。
Frost damage is an important deterioration parameter for reinforced concrete (RC) structures in cold and humid environment, which usually acts simultaneously with sustained load caused by self‐weight, immobile weight, and so forth. This article conducts a thermo‐hydro‐mechanical simulation on the structural behavior of RC beams under the coupled effect of frost damage and sustained load. This simulation approach starts from the microscale material‐based frost damage model of multicomponent substance to the macroscale structural‐based performance evaluation of RC beam. On the basis of this approach, the damage accumulation of RC beam model under both frost action and sustained load is simulated. Afterward, flexural bending load is applied to investigate the structural performance of the RC beam which has suffered coupled damage. Laboratory experiments also show a satisfactory agreement with numerical simulation. Parametric study is also conducted to further evaluate the influence by different parameters on the structural deterioration, for example, reinforcement arrangement, water to cement ratio, and so on. Finally, the equivalent frost‐damaged strength with respect to the damaged region is adopted to calculate the flexural capacity according to the design code, and a simple method is proposed to verify or predict the properties of RC beam under the coupled effect of frost damage and sustained load.