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Resistance to diagonal tension cracking of single span prestressed girders

机译:单跨预应力梁对角张力开裂的抵抗力

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In the Netherlands, existing bridges are being assessed to investigate whether they are still capable to resist current and future traffic loads. Bridges that are compiled of single span prestressed girders, appear to have insufficient resistance to diagonal tension cracking. This concerns bridges that do not contain sufficient stirrups. Consequently, diagonal tension cracking could result in an abrupt brittle failure. However, the assessments are performed using the Eurocode model and there is doubt about its accuracy. In this research the accuracy of the Eurocode model is determined by comparing predicted resistances with experimentally found resistances. Moreover the stress distribution according to the Eurocode model is compared with the stress distribution of a linear elastic finite element analysis. Based on the comparison, an alternative model is suggested, that predicts the resistance to diagonal tension cracking more accurately.
机译:在荷兰,正在评估现有的桥梁以调查它们是否仍然能够抵抗当前和未来的交通负荷。编译单跨预应力梁的桥梁似乎具有不足的对角线张力开裂的抵抗力。这涉及不含足够刺激的桥梁。因此,对角线张力裂缝可能导致突然的脆性失败。但是,评估是使用欧元建模型进行的,并且对其准确性有疑问。在本研究中,通过将预测的电阻与实验识别的电阻进行比较来确定欧元建模型的准确性。此外,根据欧元展模型的应力分布与线性弹性有限元分析的应力分布进行了比较。基于比较,提出了一种替代模型,其更准确地预测对角线张力开裂的阻力。

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