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首页> 外文会议>RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.2; 20040920-22; Varenna(IT) >SHEAR BEHAVIOUR OF PRESTRESSED BEAMS REINFORCED WITH STEEL FIBRES
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SHEAR BEHAVIOUR OF PRESTRESSED BEAMS REINFORCED WITH STEEL FIBRES

机译：钢纤维增强的预应力梁的抗剪性能

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摘要

The aim of this paper is to improve the knowledge of the behaviour of prestressed FRC and RC beams when shear failure occurs. A set of experimental tests on full-scale beams was carried out, taking particular attention to the design of the beam geometry, so as to provide information about the mechanical response of the beams both near and away from the transfer length of the strands. The performed tests were simulated by means of a finite element procedure able to predict the non linear behaviour of prestressed FRC and RC beams. A modified version of PARC stiffness matrix, in which the FRC constitutive response has been suitably modelled, has been implemented into the FE code ABAQUS. This constitutive relationship enables to model plain or reinforced concrete beams by means of membrane elements, allowing to consider the reinforcement due to both steel rebars and fibres. By means of the proposed numerical procedure, the contribution of the main phenomena occurring after cracking (such as aggregate interlock, bridging effect due to concrete and fibres, etc.) on the final shear capacity has been evaluated by means of an energetic approach. The different mechanisms will be analysed on the basis of the obtained results with particular regard to the effect of fibres.
机译：本文的目的是提高人们对发生剪切破坏时预应力FRC和RC梁的性能的了解。对全尺寸梁进行了一组实验测试，特别注意梁的几何形状设计，以便提供有关在接近或远离股线传递长度时梁的机械响应的信息。通过能够预测预应力FRC和RC梁的非线性行为的有限元程序来模拟所执行的测试。已在FE代码ABAQUS中实现了对PARC刚度矩阵的修改版本，其中已对FRC本构响应进行了适当建模。这种本构关系使得可以通过膜单元对普通或钢筋混凝土梁进行建模，从而可以考虑钢筋和纤维引起的钢筋。通过提出的数值程序，已经通过一种能量方法评估了开裂后发生的主要现象（例如骨料互锁，混凝土和纤维引起的桥接效应等）对最终剪切能力的影响。将根据获得的结果来分析不同的机制，特别是关于纤维的影响。

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