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Experimental analysis of the effective pre-stress in large-span bridge box girders after 40 years of service life

机译：40年使用寿命后大跨度桥梁箱梁有效预应力的试验分析

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The rheological properties of concrete and pre-stressing steel have a significant influence on the deformation and pre-stress losses of p.c. members and thus affect their long-term deflection and service behaviour. Long-span concrete bridge girders can be particularly sensitive to pre-stress losses as the dead load is large compared to the total load. Some observations of excessive long-term deflections have been made of long-span pre-stressed concrete box girder bridges over the last few years. This has led some researchers to question the reliability of the available theoretical models to provide correct long-term predictions. The main results of experimental tests conducted on 9 concrete bridge box-girders with a span of 35 m are presented in this work. The girders, which were part of an Italian motorway bridge dismantled after 40 years of service life, were tested up to failure with a specially built test frame. The mean deformation measured over five zones of each beam allowed the effective stress in the pre-stressing tendons to be evaluated for a total of 45 zones. Finally, the experimental data have been compared with theoretical predictions obtained by applying both the rules of an international standard (Eurocode 2) and a refined analytical model that takes into account the presence of two types of concrete with different properties as well as the various stages of the construction and pre-stressing.
机译：混凝土和预应力钢的流变特性对混凝土的变形和预应力损失有很大影响。从而影响他们的长期偏向和服务行为。大跨度混凝土桥梁大梁对预应力损失特别敏感，因为静载荷比总载荷大。在过去的几年中，对大跨度预应力混凝土箱梁桥的长期挠度有一些观察。这导致一些研究人员质疑可用理论模型提供正确长期预测的可靠性。这项工作展示了在9个跨度为35 m的混凝土桥箱梁上进行的实验测试的主要结果。大梁是意大利高速公路桥梁的一部分，在使用40年后就被拆除了，并通过特制的测试框架进行了测试，直至失效。在每个梁的五个区域上测得的平均变形允许对预应力筋中的有效应力进行总共45个区域的评估。最后，将实验数据与通过应用国际标准规则（欧洲规范2）和改进的分析模型而获得的理论预测进行了比较，该模型考虑了两种具有不同特性以及不同阶段的混凝土的存在施工和预应力。

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