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首页> 外文期刊>Magazine of Concrete Research >Bond behaviour between steel bar and concrete under sustained load and dry-wet cycles
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Bond behaviour between steel bar and concrete under sustained load and dry-wet cycles

机译：持续载荷和干湿循环下钢筋与混凝土之间的粘结性能

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摘要

Reinforced-concrete (RC) structures are inevitably subjected to sustained loads during their service life. In the natural environment, the exposed surfaces of RC members often experience dry-wet cycles due to rainfall and tides. An important parameter in structural design is the the bond behaviour between steel bars and concrete, and this is affected by the coupled effect of sustained loads and dry-wet cycles. In this study, 32 RC beam specimens were subjected to different levels of sustained load (25%, 50% and 75% of ultimate load) and dry-wet cycles for a period of 120 d. The immediate slip and time-dependent slip (TDS) between the steel bar and concrete during testing were recorded and analysed. It was found that the TDS increased with an increase in the duration of sustained loading and greater sustained load levels resulted in larger TDSs. After long-term testing, the bond strength and bond stress-strain were investigated using a flexural-bond test. The results showed that bond strength increased due to the coupled effects of sustained load and dry-wet cycles. Based on the test results, an empirical model for steel bar-concrete TDS considering the effect of sustained load and dry-wet cycles was developed.
机译：钢筋混凝土（RC）结构在使用寿命期间不可避免地要承受持续的载荷。在自然环境中，RC构件的暴露表面经常由于降雨和潮汐而经历干湿循环。结构设计中的一个重要参数是钢筋与混凝土之间的粘结性能，这受持续载荷和干湿循环的耦合效应影响。在这项研究中，对32个RC梁样本进行了120 d的不同水平的持续载荷（极限载荷的25％，50％和75％）和干湿循环。记录并分析了测试过程中钢筋与混凝土之间的即时滑移和随时间变化的滑移（TDS）。发现随着持续载荷持续时间的增加，TDS增加，而更大的持续载荷水平导致更大的TDS。经过长期测试后，使用弯曲粘结试验研究了粘结强度和粘结应力-应变。结果表明，由于持续载荷和干湿循环的耦合作用，粘结强度增加。根据测试结果，建立了考虑持续荷载和干湿循环影响的钢筋混凝土TDS的经验模型。

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  • 来源
    《Magazine of Concrete Research》 |2019年第14期|700-709|共10页
  • 作者

    Shang Huaishuai; Ren Guosheng; Hou Dongshuai; Zhang Peng; Zhao Tiejun;

  • 作者单位

    Qingdao Univ Technol, Sch Civil Engn, Qingdao, Shandong, Peoples R China|Qingdao Univ Technol, Cooperat Innovat Ctr Engn Construct & Safety Shan, Qingdao, Shandong, Peoples R China;

    Qingdao Univ Technol, Sch Civil Engn, Qingdao, Shandong, Peoples R China;

    Qingdao Univ Technol, Sch Civil Engn, Qingdao, Shandong, Peoples R China|Qingdao Univ Technol, Cooperat Innovat Ctr Engn Construct & Safety Shan, Qingdao, Shandong, Peoples R China;

    Qingdao Univ Technol, Sch Civil Engn, Qingdao, Shandong, Peoples R China|Qingdao Univ Technol, Cooperat Innovat Ctr Engn Construct & Safety Shan, Qingdao, Shandong, Peoples R China;

    Qingdao Univ Technol, Sch Civil Engn, Qingdao, Shandong, Peoples R China|Qingdao Univ Technol, Cooperat Innovat Ctr Engn Construct & Safety Shan, Qingdao, Shandong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bond; loads loading; moisture-related properties;

    机译：粘结;负荷与负荷;与水有关的特性;

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