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Numerical investigation and design of reinforced concrete beams with non-uniform frost damage on the compression and tension sides

机译：钢筋混凝土梁对压缩和拉伸侧的钢筋混凝土梁的数值调查与设计

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摘要

This paper aims to investigate the bending behaviour of a reinforced concrete (RC) beam with different non-uniform frost damages. A multi-scale poromechanical approach is developed to build a bridge between the material deterioration process and the structural mechanical performance by considering the global heat and moisture transport and rebar confinement, as well as the local phase changes and poromechanical deformation. The real-time frost damage process is first simulated and experimentally validated for different depths of exposure on both the compression and tension sides and then used for testing the residual bending behaviour. The failure modes, load-carrying capacity and strain distribution of the reinforcement are fairly consistent with the experimental results. The bearing capacity decreases with the increment of the freeze-thaw cycles (FTC) and the frost exposure depth. Reinforcing bars can restrain not only crack propagation but also frost damage. Thus, the bearing capacity of the damaged beam on the compression side drops more than that on the tension side for the same exposure depth. Finally, an indirect method for the use of the equivalent deteriorated mechanical properties is compared with the detailed real-time simulation, and a simple design method is proposed for RC beams with partial frost damage.
机译：本文旨在调查钢筋混凝土（RC）光束具有不同的不均匀霜冻损伤的弯曲行为。通过考虑全球热量和水分运输和钢筋限制以及局部相变和多孔机动变形，开发了一种多尺度的多孔机械方法来构建材料劣化过程和结构力学性能之间的桥梁。首先模拟实时霜损伤过程，并在压缩和张力侧面上进行不同的曝光深度，然后用于测试残余弯曲行为。钢筋的失效模式，载荷容量和应变分布与实验结果相当一致。承载能力随着冻融循环（FTC）的增量和霜冻曝光深度而降低。钢筋可以抑制不仅裂纹繁殖，而且损坏霜冻。因此，对于相同的曝光深度，压缩侧上的损坏光束的承载能力小于张力侧的张力侧。最后，将用于使用等同的劣化机械性能的间接方法与详细的实时模拟进行比较，并且提出了一种简单的设计方法，用于具有部分霜冻损坏的RC梁。

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