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首页> 外文期刊>Advances in Structural Engineering >Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion
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Experimental investigation on long-term behavior of prestressed concrete beams under coupled effect of sustained load and corrosion

机译：持续载荷耦合效应下预应力混凝土梁长期行为的实验研究

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摘要

Prestressed concrete beams are widely used in construction, while they may be attacked by the corrosion medium during the service. Past research works show that coupled effect of high stress and corrosion can significantly deteriorate the performance of prestressed concrete structures. This article presents an experimental investigation on long-term behavior of prestressed concrete beams under the coupled effect of sustained load and corrosion. During the accelerated corrosion process, six prestressed concrete beams were subjected to different levels of sustained loads, and time-dependent prestress loss and concrete stains were recorded and analyzed. It is observed that the local corrosion (i.e. pitting corrosion) of the steel strands was significantly affected by the sustained load level, and the coupled effect led to more serious damage on the beams than individual sustained load or corrosion. Bending loads were finally applied to investigate the influence of corrosion on flexural capacities of these beams. It was found that the flexural capacities and failure mode of the beams were significantly influenced by corrosion. Meanwhile, the corrosion has more significant effect on tension strength of strands rather than bond strength.
机译：预应力混凝土梁广泛用于施工，而它们可能在服务期间受腐蚀介质攻击。过去的研究工作表明，高应力和腐蚀的耦合效果可以显着降低预应力混凝土结构的性能。本文提出了在持续载荷和腐蚀的耦合效应下预应力混凝土梁的长期行为的实验研究。在加速腐蚀过程中，对六个预应力的混凝土梁进行了不同水平的持续载荷，并记录并分析了时间依赖的预应力损失和混凝土污渍。观察到钢绞线的局部腐蚀（即点蚀腐蚀）受到持续载荷水平的显着影响，并且耦合效果导致比单个持续的负荷或腐蚀更严重的损坏。最终施加弯曲载荷以研究腐蚀对这些梁的弯曲能力的影响。发现梁的弯曲能力和失效模式受腐蚀的显着影响。同时，腐蚀对股线的张力而不是粘合强度具有更大的影响。

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