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首页> 外文期刊>Magazine of Concrete Research >Effect of existing cracks on shear failure behaviour of reinforced concrete members
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Effect of existing cracks on shear failure behaviour of reinforced concrete members

机译：现有裂缝对钢筋混凝土构件剪切破坏行为的影响

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摘要

The effect of existing cracks on shear failure behaviour of reinforced concrete (RC) members was investigated in this paper. The authors conducted the experiments on shear response of pre-cracked RC members with various quantities of stirrups. The objective of the study is to identify the effect of pre-cracks on concrete that resists shear through diagonal tension, as in beams without stirrups, and through compressive struts, as in beams with large amounts of stirrups. In the former case, it is found that pre-cracks delay diagonal tension failure, thus elevating the shear capacity. The apparent increase in concrete tension capacity arises from the crack arrest mechanism. The propagation of a diagonal shear crack is arrested by the pre-crack. A considerable increase in shear capacity is obtained, and the failure mode is changed from brittle shear to flexural yielding. On the other hand, in the case of a beam containing large amounts of stirrups, pre-cracks decrease the web-crushing capacity. Pre-cracks are supposed apparently to weaken the concrete struts by two mechanisms: a reduction in the effective contact area of crack surface and a reduction in the compressive strength of concrete near pre-crack owing to micro-fracturing damages. In the case of beams with a fair amount of stirrups, the failure is governed by yielding of stirrups rather than crushing of web concrete, hence the web-crushing mode is not relevant. The increase in diagonal tension capacity of concrete therefore leads to the increase in the overall shear capacity.
机译：本文研究了现有裂缝对钢筋混凝土构件剪切破坏行为的影响。作者对含各种箍筋的预裂钢筋混凝土构件的剪切响应进行了实验。该研究的目的是确定预裂纹对混凝土的影响，该混凝土可抵抗斜向拉伸（如无箍筋的梁）和抗压支柱（如含大量箍筋的梁）的剪切。在前一种情况下，发现预裂纹会延迟对角拉伸失败，从而提高剪切能力。混凝土抗拉能力的明显提高是由于裂缝的阻止机制。对角剪切裂纹的扩展被预裂纹阻止。剪切能力大大提高，破坏模式从脆性剪切变为弯曲屈服。另一方面，在梁中含有大量的箍筋的情况下，预裂会降低幅材的破碎能力。预裂纹显然被认为是通过两种机制来削弱混凝土支杆：裂纹表面的有效接触面积的减少和由于微裂纹的破坏而降低了预裂纹附近混凝土的抗压强度。在梁具有大量箍筋的情况下，破坏是由箍筋的屈服而不是网状混凝土的破碎来控制的，因此，网状破碎的模式无关紧要。因此，混凝土对角抗拉能力的增加导致总剪切能力的增加。

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  • 来源
    《Magazine of Concrete Research》 |2005年第8期|p.485-495|共11页
  • 作者

    A. Pimanmas; J. Tisavipat;

  • 作者单位

    School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Pathumthani 12121, Thailand;

  • 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 水泥工业;
  • 关键词

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