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首页> 外文会议>Structural Stability Research Council 2005 Annual Stability Conference; 20050406-09; Montreal(CA) >LEAN-ON BRACING FOR STEEL BRIDGE GIRDERS WITH SKEWED SUPPORTS
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LEAN-ON BRACING FOR STEEL BRIDGE GIRDERS WITH SKEWED SUPPORTS

机译：带斜撑的钢桥梁的自由支撑

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摘要

Cross-frames and diaphragms are frequently used for bracing against lateial-torsional buckling in steel bridge girders. For bridges with significant skew angles, relatively large live load forces can result in the braces due to truck loading on the finished bridge. The number of cross-frames as well as the induced forces can be substantially reduced by using lean-on bracing concepts in which several girders "lean-on" a single cross-frame. The state of Texas is implementing the results from a research study conducted at the University of Houston investigating the bracing behavior of cross-frames and diaphragms in systems with skewed supports. The implementation project has focused on the bracing designs for three bridges in Lubbock, Texas with skew angles ranging from approximately 54 degrees to 60 degrees, The bridges have two spans of approximately 170 and 180 feet. One of the bridges has nine girders through the width while the other two bridges have 6 girders. Using the lean-on concepts the number of intermediate cross-frames has been substantially reduced. For example in the bridge with 9 girders, the number of intermediate cross-frames has been reduced from approximately 130 to 28. The conventional X-bracing from the cross-frames has been replaced with top and bottom struts that provide a lean-on path to a full cross-frame. This paper provides a summary of the research recommendations that are being used in the bracing design and an overview of the resulting bracing layout, The University of Houston will instrument the bridges to monitor the behavior during construction and subsequent live loading.
机译：横框架和隔板经常用于支撑钢桥大梁的扭转扭转。对于具有较大偏斜角的桥梁，由于卡车在完成的桥梁上的负载，较大的活载力可能会导致支撑。通过使用倾斜支撑概念，其中多个大梁“倾斜”单个交叉框架，可以大大减少交叉框架的数量以及感应力。得克萨斯州正在实施休斯敦大学进行的一项研究的结果，该研究调查了带有倾斜支撑的系统中横梁和隔板的支撑性能。实施项目的重点是在德克萨斯州拉伯克市的三座桥梁的支撑设计，其倾斜角度范围从大约54度到60度。这些桥梁有两个跨度分别为170英尺和180英尺。其中一个桥在整个宽度上有9个大梁，而另外两个桥有6个大梁。使用倾斜概念，中间交叉框架的数量已大大减少。例如，在具有9个大梁的桥中，中间横梁的数量已从大约130个减少到28个。横梁中的常规X支撑已被提供了倾斜路径的顶部和底部支杆代替。一个完整的跨框架。本文提供了在支撑设计中使用的研究建议的摘要，并概述了所产生的支撑布局。休斯顿大学将对桥梁进行监测，以监测施工和随后的现场荷载过程中的行为。

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