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首页> 外文期刊>Transportation Research Record >Behavior of Steel Bridges Under Superload Permit Vehicles
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Behavior of Steel Bridges Under Superload Permit Vehicles

机译：超载许可车辆下钢桥的行为

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摘要

The need for more power in the United States has spurred a major power plant building program. These plants are usually located where natural gas pipelines cross the power grid, which is generally in more remote areas. To build these plants, construction companies are increasingly using the highway system to move large pieces of plant equipment to the project site. Traditional permit vehicles on highways have had limited gross vehicle weights ranging from 100,000 to 250,000 lb. Special heavy-load vehicles have been developed to spread the loads both longitudinally and transversely and to allow engineers to move loads in excess of 1,000,000 lb successfully without the need for temporary support of existing structures. The different types of vehicles that are available and their effect on steel bridges are considered. Simplified methods of analysis including live load distribution, dynamic load allowance (impact), and trailer layout options are investigated. Strain gauge data are presented from an actual 1,000,000-lb permit vehicle that crossed a three-span composite steel bridge in Connecticut. Results of the gauging are compared with the estimates of live load stress from the structural analysis.
机译：在美国，对更多电力的需求刺激了一项重要的电厂建设计划。这些工厂通常位于天然气管道横穿电网的地方，通常位于较偏远的地区。为了建造这些工厂，建筑公司越来越多地使用高速公路系统将大型工厂设备移至项目现场。高速公路上的传统许可车辆的总车重有限，从100,000到250,000 lb不等。已经开发了特殊的重型车辆来纵向和横向分散载荷，并允许工程师成功移动超过1,000,000 lb的载荷而无需为现有结构提供临时支持。考虑了可用的不同类型的车辆及其对钢桥的影响。研究了简化的分析方法，包括活荷载分配，动荷载允许（影响）和拖车布局选项。应变仪数据来自实际的100万磅许可车辆，该车辆越过康涅狄格州的三跨复合钢桥。测量结果与结构分析中的活载应力估算值进行了比较。

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