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首页> 外文会议>Innovative infrastructures - toward human urbanism : Report >Fatigue of Prestressed Concrete Beams with low Shear Reinforcement Ratios - Experimental Investigations
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Fatigue of Prestressed Concrete Beams with low Shear Reinforcement Ratios - Experimental Investigations

机译：低剪力比的预应力混凝土梁的疲劳-试验研究

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摘要

The demands on the load-carrying capacity of existing bridges increased over the last decades duernto higher traffic loads. In this context, the shear resistance is of special interest. As part of a researchrnproject, tests on single span I-shaped prestressed concrete beams with low shear reinforcementrnratios (ρ_w = 0,15 % and 0,22 %) under cyclic loading have been performed. The test beams andrninvestigated load regimes refer to the conditions of existing bridges. The cyclic loading led torngradually stirrup fractures accompanied by a redistribution of forces between adjacent stirrups andrnincreasing deformations and crack widths. Furthermore, a direct compression strut contributing tornthe shear carrying capacity developed. Due to an overestimation of the stress range by the commonrndesign approach for shear fatigue, the stirrups were able to resist more load cycles than predicted. Inrnsome stirrups the tensile strength was exceeded after previous fatigue failure of adjacent stirrups.
机译：在过去的几十年中，由于较高的交通负荷，对现有桥梁的承载能力的需求增加了。在这种情况下，抗剪切性特别重要。作为一项研究项目的一部分，已经在循环荷载下对低跨度钢筋混凝土单跨I形预应力混凝土梁（ρ_w= 0.15％和0.22％）进行了测试。测试梁和研究的荷载状态是指现有桥梁的状况。周期性载荷导致箍筋逐渐断裂，并伴随着相邻箍筋之间力的重新分布以及变形和裂缝宽度的增大。此外，开发了有助于压缩承载能力的直接压缩支柱。由于使用剪力疲劳的通用设计方法高估了应力范围，因此箍筋能够承受比预期更多的载荷循环。在相邻的箍筋先前疲劳破坏之后，不稳固的箍筋超过了拉伸强度。

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