Analytical Investigation of the Influence of Rebar Arrangement on Corrosion Crack Pattern by RBSM
Analytical Investigation of the Influence of Rebar Arrangement on Corrosion Crack Pattern by RBSM
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DOI：
10.21012/fc10.232675
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
P. Jiradilok
中科院分区：
文献类型：
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作者：
P. Jiradilok
当腐蚀发生时，钢筋的腐蚀部分变成大量的锈蚀产物，对周围的混凝土产生内部压力。这种内部压力导致混凝土开裂。然而，表面裂纹的位置可能不直接对应于钢筋锈蚀的位置。混凝土保护层厚度、钢筋数量、钢筋间距、钢筋布置方式等参数对腐蚀裂缝形态有很大的影响，由于这些参数的影响，从已知的表面裂缝信息中识别腐蚀位置是困难的。在真实的工程中，通常通过外表面检测来评估结构的状态。尽管有许多技术可以观察结构的外部状况，如无人机或数字图像分析技术，但用于调查内部腐蚀状况的方法仍然有限且不清楚。因此，本文旨在通过使用数值方法来提高对影响腐蚀裂纹模式的因素的理解。数值计算系统是基于三维离散分析模型-刚体弹簧模型（RBSM）开发的。基于离散分析模型的特点，通过给出钢筋-混凝土界面处的膨胀应变，数值模型可以模拟实际锈蚀情况下的膨胀开裂。利用该模型对不同控制条件下的钢筋混凝土模型进行了数值模拟。通过数值模拟，研究了钢筋约束、混凝土保护层厚度、钢筋直径和钢筋数量等因素对钢筋混凝土柱抗弯性能的影响。最后，讨论了影响参数的影响和不同的裂纹模式。
When the corrosion occurs, the corroded portion of the rebar turns into a voluminous rust product which creates the internal pressure on the surrounding concrete. This internal pressure results in the cracking of concrete. However, the surface crack location may not correspond directly to the location of rebar corrosion. There are many parameters that affect the corrosion crack patterns, namely, concrete cover depth, amount and spacing of the rebar, the arrangement of rebar and so on. Due to the contribution of these parameters, identifying the corrosion location from the given surface crack information is difficult. In the real field, the structure condition is usually evaluated by the exterior surface inspection. Even though there are many technologies for observing the external condition of the structures, like a drone or digital image analysis technique, the method for investigating the internal corrosion condition are still limited and unclear. Hence, this paper aims to improve the understanding of the factors that affect the corrosion crack pattern through the use of numerical methods. The numerical system was developed based on the three-dimensional discrete analysis model, Rigid Body Spring Model (RBSM). Based on the characteristics of the discrete analysis model, by giving the expansive strain at the rebar-concrete interface, the numerical model can simulate the same expansion cracking as observed in actual cases of corrosion. Then, by using this model, the reinforced concrete models with different control conditions are simulated. The effect of stirrup confinement, concrete cover depth, diameter of rebar and number of rebars are studied through simulation results. Finally, the effect of influential parameters and the different crack patterns are discussed and presented.