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首页> 外文期刊>Transportation Research Record >Monitoring Prestressed Concrete Box-Beam Bridge for Superloads
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Monitoring Prestressed Concrete Box-Beam Bridge for Superloads

机译：监测预应力混凝土箱梁桥的超载

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Monitoring Coeymans Creek Bridge in New York State for superload permit trucks is discussed. The superloads were boiler modules carried on 16-axle trailers, driven by one or two tractor-power units during the bridge crossing. The bridge is an integral abutment structure consisting of 11 prestressed concrete box beams with a composite concrete deck. Approval of the superload permits was based on an engineering analysis that recommended crossing of the bridge in two configurations: the first required that a crabbed trailer be towed across the bridge; the second called for a trailer to be driven in a diagonal crossing fashion. Crabbing, that is, locking trailer wheels to remain parallel to the bridge centerline during the crossing, was recommended for moves of gross weights equal to or exceeding 1,775 kN (400 kips), and diagonal crossings were recommended for those lighter than 1,775 kN (400 kips). The low rating of the structure and the unusually heavy loads motivated the need for investigating actual stress levels in the bridge beams during the superload moves. There was also interest in comparing the two recommended crossing patterns and investigating the level of fixity provided by the integral abutments. The beams were instrumented, and strain data were collected during four of the moves. Analysis of the collected data indicated that the stresses in the beams remained below what would have caused cracking and that, for this bridge, crabbing had no clear benefits over diagonal crossing. The analysis also indicated that the bridge has good transverse load distribution and a significant level of end fixity provided by the integral abutments.
机译：讨论了监视纽约州的Coeymans Creek大桥的超载许可卡车。超负荷是在桥渡期间由一两个拖拉机动力单元驱动的16轴拖车上的锅炉模块。该桥是一个整体式桥台结构，由11个预应力混凝土箱形梁和​​复合混凝土面板组成。超载许可的批准基于一项工程分析，建议以两种配置横穿桥梁：第一种要求将带拖钩的拖车拖曳跨过桥；第二个则要求以对角线穿越方式驱动拖车。对于总重等于或超过1,775 kN（400 kips）的举动，建议使用摇晃，即锁定拖车车轮以使其与桥的中心线保持平行，对于小于1,775 kN（400 kips）。结构的低额定值和异常重的负载激发了在超载移动期间需要调查桥梁中实际应力水平的需求。还有兴趣比较两种推荐的交叉方式并调查整体式基台提供的固定程度。对梁进行检测，并在四个移动过程中收集应变数据。对收集到的数据的分析表明，梁中的应力仍低于会导致开裂的应力，并且，对于这座桥梁，抓蟹没有明显的好处。分析还表明，该桥具有良好的横向载荷分布，并且由整体式基台提供了可观的端部固定性。

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