In the recent years, bridges, as an important part of the national and international infrastructure, had to comply with stricter requirements due to increased heavy load traffic. Many of these bridge structures built in the 1960s and 1970s often contain less web reinforcement than the modern required minimum web reinforcement. In this context, the shear resistance under cyclic loading is of special interest. For this reason, experimental tests were conducted on prestressed concrete beams with and without shear reinforcement at the Institute of Structural Concrete of RWTH Aachen University to investigate the shear fatigue strength. This paper describes the recent tests on ten Tshaped prestressed beams with web reinforcement. The specimens were able to resist more load cycles than predicted by the approaches implemented in the Eurocodes for bridges. Based on the test results, design models for shear under cyclic loading should be reviewed and improved, especially regarding the assessment of existing structures.

中文翻译：

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桥梁预应力混凝土T梁抗剪疲劳试验

近年来，由于重载交通的增加，桥梁作为国家和国际基础设施的重要组成部分，必须遵守更严格的要求。1960年代和1970年代建造的许多桥梁结构通常都比现代要求的最小腹板加强筋少。在这种情况下，在循环载荷下的抗剪切性特别令人关注。因此，在亚琛工业大学结构混凝土研究所对带有或不带有剪切增强的预应力混凝土梁进行了试验测试，以研究剪切疲劳强度。本文介绍了最近对十个带有腹板加固的T形预应力梁的测试。样品能够承受比欧洲规范在桥梁中采用的方法预期的更多的载荷循环。