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首页> 外文期刊>Magazine of Concrete Research >Influence of strain rates and load histories on the tensile damage behaviour of concrete
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Influence of strain rates and load histories on the tensile damage behaviour of concrete

机译：应变率和载荷历程对混凝土拉伸损伤行为的影响

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Concrete structures are often subjected to dynamic loads, such as seismic, blast or impact loads. Under such loads, distinct changes may occur in the dynamic and damage behaviour of concrete. This paper presents the results of dynamic tensile tests of plain concrete specimens with axial strain rates ranging from 10~(-5)/s to 10~(-1)/s that were carried out on a servo-testing machine. Observed stages of damage evolution are divided into three phases: undeveloped, steadily developed and unsteadily developed. This study found that the stress threshold ratio of ultimate strength increases with strain rate, and that the initial tangent elastic modulus and Poisson 's ratio are independent of the strain rate for the test specimens. Moreover, the tensile strength and critical strain of concrete increased approximately linearly with the logarithm of the strain rate, and an experimental relationship between strain rates and tensile strength, critical strain was established. Furthermore, dynamic tensile damage tests of concrete were carried out with axial strain rates ranging from 10~(-5)/s to 10~(-2)/s. The effects of loading histories on dynamic tensile strengths, dynamic stress-strain curves, and dynamic damage behaviour of concrete were studied. Results indicate that both dynamic tensile strengths and damage thresholds of concrete decreased while the given rated loading was applied compared with those samples that were not subjected to the load history. However, damage of concrete at the same stress ratio and strain ratio increased with the increasing load history.
机译：混凝土结构通常承受动态载荷，例如地震，爆炸或冲击载荷。在这种载荷下，混凝土的动力和破坏行为可能发生明显变化。本文介绍了在伺服试验机上进行的轴向应变速率为10〜（-5）/ s至10〜（-1）/ s的普通混凝土试样的动态拉伸试验的结果。观察到的损害演变阶段分为三个阶段：未发展，稳定发展和不稳定。这项研究发现极限强度的应力阈值比随应变率而增加，并且初始切线弹性模量和泊松比与试样的应变率无关。此外，混凝土的抗拉强度和临界应变随应变率的对数近似线性增加，并建立了应变率与抗拉强度，临界应变之间的实验关系。此外，还进行了轴向拉伸速率为10〜（-5）/ s至10〜（-2）/ s的混凝土动态拉伸损伤试验。研究了载荷历史对混凝土动态抗拉强度，动态应力-应变曲线和动态破坏行为的影响。结果表明，与未承受载荷历史的那些样品相比，当施加给定的额定载荷时，混凝土的动态抗拉强度和损伤阈值均降低。然而，在相同的应力比和应变比下，混凝土的破坏随着荷载历史的增加而增加。

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  • 来源
    《Magazine of Concrete Research》 |2010年第12期|p.887-894|共8页
  • 作者

    S. Xiao; H. Li; P. J. M. Monteirot;

  • 作者单位

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    Department of Civil and Environmental Engineering, University of California, Berkeley, CA, 94720, USA;

  • 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
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