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Effects of Corrosion on Compressive Arch Action and Catenary Action of RC Frames to Resist Progressive Collapse Based on Numerical Analysis

机译：基于数值分析的腐蚀对抗压拱动作和裂纹作用的影响抵抗逐步崩溃

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摘要

Many negative factors can influence the progressive collapse resistance of reinforced concrete (RC) frame structures. One of the most important factors is the corrosion of rebar within the structure. With increasing severity of corrosion, the duration, robustness, and mechanical performance can be greatly impaired. One specific side effect of rebar corrosion is the significant loss of protection against progressive collapse. In order to quantify the effects of rebar corrosion on load-resisting mechanisms (compressive arch action (CAA) and tensile catenary action (TCA)) of RC frames, a series of numerical investigations were carried out in this paper. The previous experimental results reported in the literature provide a benchmark for progressive collapse behavior as a sound condition and validate the proposed numerical model. Furthermore, based on the verified numerical model, the CAA and TCA with increasing corrosion and an elapsed time from 0 to 70 years are investigated. Comparing with the conventional empirical model, the proposed numerical model has shown the ability and feasibility in predicting the collapse resistance capacity in structures with corroded rebar. Therefore, this numerical modeling strategy provides comprehensive insights into the change of load-resisting mechanisms in these structures, which can be beneficial for optimizing the design.
机译：许多负面因素可以影响钢筋混凝土（RC）框架结构的逐渐塌陷性。最重要的因素之一是结构内钢筋的腐蚀。随着腐蚀的严重程度，持续时间，稳健性和机械性能都可以大量受损。钢筋腐蚀的一个特定副作用是对逐步崩溃的显着丧失。为了量化钢筋腐蚀对RC帧的抵抗机制的影响（压缩弓动作（CAA）和拉伸膨胀动作（TCA）），本文进行了一系列数值研究。文献中报告的先前实验结果为逐行崩溃行为提供了一种基准，作为声音状况，并验证提出的数值模型。此外，根据经过验证的数值模型，研究了CAA和TCA随着腐蚀的增加和0至70岁的经过时间。与传统的经验模型相比，所提出的数值模型表明了预测具有腐蚀钢筋结构中的结构塌陷容量的能力和可行性。因此，这种数值建模策略为这些结构中的负载抵抗机构的变化提供了全面的见解，这可能有利于优化设计。

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