腐蚀钢筋混凝土连续深弯构件抗渐溃试验研究

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2025-03-23 DOI:10.1016/j.engfailanal.2025.109543

Chao Bao , Huan Long , Xiaotong Ma , Ibrahim M.H. Alshaikh , Galal Al-Mekhlafi , Luyuan Peng , Huxiang Wang

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引用次数: 0

摘要

异常荷载可引起局部损伤，有可能引发钢筋混凝土结构的逐步倒塌，造成人员伤亡和严重的经济损失。在沿海或高盐度环境中，恶劣的条件会加速结构的降解，降低结构对逐渐坍塌的抵抗力，这主要是由于氯化物渗透引起的钢筋腐蚀。为研究腐蚀环境对钢筋混凝土连续深弯构件抗递进倒塌性能的影响，对4个按比例缩小的钢筋混凝土下部结构试件进行了拟静力试验。除1个对照组试样外，其余3个试样在整个试样区域分别以3%、9%和12%的速度进行电化学加速腐蚀。分析和比较了失效模式和内力。结果表明：腐蚀和未腐蚀试件的损伤均集中在靠近梁端的塑性铰区域；钢筋腐蚀对压拱机制和悬链线机制的影响显著，使这两种机制的承载力分别降低12.0%和16.0%。

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Experimental study on progressive collapse resistance of corroded RC continuous deep flexural members

Abnormal loads can induce localized damage, potentially triggering the progressive collapse of reinforced concrete (RC) structures, leading to casualty and severe economic loss. In coastal or high-salinity environments, harsh conditions accelerate structural degradation, compromising resistance to progressive collapse, primarily due to reinforcing bar corrosion caused by chloride infiltration. To investigate the impact of corrosive environments on the progressive collapse resistance of RC continuous deep flexural members, quasi-static testing was conducted on four scaled-down RC substructure specimens. Besides one control group specimen, the remaining three specimens underwent electrochemically accelerated corrosion at 3%, 9%, and 12% across the entire specimen area, respectively. Failure modes and internal force were analyzed and compared. The results show that damage in both corroded and uncorroded specimens was concentrated in the plastic hinge regions near the beam ends. Reinforcing bar corrosion significantly affected the compression arch mechanism and the catenary mechanism, reducing the bearing capacities of these two mechanisms by up to 12.0% and 16.0%, respectively.

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.