爆炸后连续张拉预应力混凝土箱梁桥结构修复研究

N. Oukaili
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引用次数: 1

摘要

本文以某四跨连续预应力混凝土箱梁桥为例进行了研究,该桥连续两跨的桥面和腹板因装载高爆材料的拖车爆炸而发生大面积破坏。这座8单元箱梁桥连接着巴格达市和伊拉克南部其他省份。桥长166 m,桥面和软板宽度分别为20.5 m和16.3 m,总断面深度为1.30 m。从经济和交通的角度来看,这种结构的重要性使得不可能考虑完全替代。因此,由于这一过程的繁琐、时间和费用,已经排除了更换四个跨度的可能性。研究的两个主要目标是如何保持预应力效应和如何补偿未损伤跨度的连续性。为了实现这些目标,在桥墩位置的每个跨截面腹板上直接实施了约束机制。同时,对箱梁桥的两段未损伤跨度进行了加固,分别在桥面板的顶部混凝土纤维和软肋板的底部混凝土纤维处安装了一系列钢板条。这种方法改善了桥面应力分布,保持了箱梁预应力布置所提供的原有抗载机制。
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Structural Rehabilitation on Continuous Post-Tensioned Prestressed Concrete Box-Girder Bridge Exposed to Explosion: A Case Study
This paper focuses on a case study of a fourspan continuous prestressed concrete box-girder bridge that developed extensive damages to the deck and webs in two successive spans due to an explosion by a trailer charged with high explosive materials. The eight cell box-girder bridge is connecting Baghdad city with the other southern provinces of Iraq. The bridge is 166 m long, the deck and soffit slab widths are 20.5 m and 16.3 m, respectively, and the overall crosssectional depth is 1.30 m. The importance of this structure from economic and traffic points of view has made it impossible to think of the total replacement. Accordingly, the possibility of the replacement of the four spans was ruled out due to the tedious nature of the process, the time and cost. The main two goals of the study were how to keep the prestressing effect and how to compensate the continuity in the nondamaged spans. To achieve these goals, mechanism for restraining was implemented directly at each cross-sectional web of a span at a pier location. Also, a strengthening of the two non-damaged spans of the box-girder bridge was performed by installing a series of steel plate strips at the top concrete fibers of the deck slab and bottom concrete fibers of the soffit slab. This approach improved the stress distribution in the deck and maintained the original load resistance mechanism provided by the prestressing arrangement in the box-girder.
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