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首页> 外文期刊>Engineering Structures >Analytical prediction of the pinching mechanism of RC elements under cyclic shear using a rotation-angle softened truss model
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Analytical prediction of the pinching mechanism of RC elements under cyclic shear using a rotation-angle softened truss model

机译：旋转角软化桁架模型对钢筋混凝土构件在循环剪力作用下的捏合机理的分析预测

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The response of a reinforced concrete (RC) element under cyclic shear is characterized by the hysteretic loops of the shear stress-strain curves. These hysteretic loops can exhibit strength deterioration, stiffness degradation, and a pinched shape. Recent tests [Mansour MY, Hsu TTC. Behavior of reinforced concrete elements under cyclic shear. I: Experiments. ASCE Journal of Structural Engineering 2005;131(1):44-53] have shown that the orientation of steel grids in RC shear elements has a strong effect on the "pinching effect" in the post-yield hysteretic loops. When the steel grid was set at a 45 degree angle to the shear plane, there was no pinching effect and no strength deterioration. However, when the steel grid was set parallel to the shear plane, there was a severe pinching effect and severe strength deterioration with increasing shear strain magnitude. It was thus obvious that the undesirable "pinching effect" and strength deterioration that were attributed to the presence of high shear forces can be eliminated by properly orienting the steel grid in RC elements subjected to cyclic shear. In this paper, two RC elements subjected to reversed cyclic shear stresses are considered to study the effect of the steel grid orientation on the shape of the cyclic shear stress-strain curves. The presence and absence of the pinching mechanism in the post-yield shear hysteretic loops is studied using the Rotating Angle Softened Truss Model (RA-STM) theory [Hsu TTC. Softened truss model theory for shear and torsion. ACI Structural Journal 1988;85(6):624-35]. It is found that the RA-STM when combined with newly proposed cyclic material constitutive relationships can rationally predict the presence and absence of the pinching effect in the shear hysteretic loops of RC shear elements but is still incapable of predicting the descending envelopes.
机译：钢筋混凝土（RC）单元在循环剪切作用下的响应以剪切应力-应变曲线的磁滞回线为特征。这些磁滞回线会表现出强度下降，刚度下降和挤压形状。最近的测试[Mansour MY，Hsu TTC。钢筋混凝土构件在循环剪切作用下的行为。我：实验。 [ASCE结构工程学报2005; 131（1）：44-53]表明，钢筋混凝土剪力单元中钢格网的取向对屈服后滞回环中的“挤压效应”有很大影响。当钢格板与剪切平面成45度角时，没有夹紧效应，也没有强度降低。但是，当钢格板平行于剪切平面放置时，随着剪切应变幅度的增加，会出现严重的挤压效应和严重的强度降低。因此，很明显，可以通过在经受周期性剪切的RC元件中适当地定向钢网格，消除由于高剪切力的存在而引起的不希望的“收缩效应”和强度降低。在本文中，考虑了两个承受反向循环剪应力的RC单元，以研究钢格网取向对循环剪应力-应变曲线形状的影响。使用旋转角软化桁架模型（RA-STM）理论[Hsu TTC]研究了屈服后剪切滞回环中是否存在收缩机制。剪切和扭转的软化桁架模型理论。 ACI结构杂志1988; 85（6）：624-35]。结果发现，RA-STM与新提出的循环材料本构关系相结合，可以合理地预测RC剪切元件的剪切滞回回线中是否存在收缩效应，但仍无法预测下降的包络线。

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