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Shear capacity of continuous pre-stressed concrete bridge girders with different static systems through vertical prestressing

机译：垂直预应力作用下不同静系统的连续预应力混凝土连续梁的抗剪承载力

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摘要

Some existing bridge girders do not satisfy current shear strength requirement and so study of this strength seems essential. Shear strength of pre-stressed concrete bridge girders with and without vertical prestressing is studied in this paper. First several models of prestressed concrete beams are selected and analyzed using the finite-element method. In this regard the validity of modeling is evaluated based on some test performed on an existing bridge girder in Switzerland. In the second part of the study several beam specimens are built and tested and their load-deformation curve and cracking pattern are studied. Using all numerical and experimental studies, the slope of shear cracks and shear reinforcement ratio are investigated and the effect of horizontal and vertical pre-stressing on the noted parameters is evaluated. The findings should be of interest to researchers as well as practicing engineers involved in analysis and design of prestressed concrete beams.
机译：现有的一些桥梁梁不能满足当前的抗剪强度要求，因此研究这种强度似乎是必不可少的。研究了有竖向预应力和无竖向预应力的预应力混凝土桥梁的抗剪强度。首先，使用有限元方法选择并分析了几种预应力混凝土梁模型。在这方面，建模的有效性是根据在瑞士现有桥梁上进行的一些测试进行评估的。在研究的第二部分中，建立并测试了多个梁样本，并研究了它们的载荷-变形曲线和裂缝模式。使用所有数值和实验研究，研究了剪切裂缝的斜率和剪切增强比，并评估了水平和垂直预应力对所述参数的影响。研究人员以及从事预应力混凝土梁分析和设计的从业工程师都应该对这一发现感兴趣。

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