Quantifying Field-Test Behavior for Rating Steel Girder Bridges
Quantifying Field-Test Behavior for Rating Steel Girder Bridges
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DOI：
10.1061/(asce)1084-0702(2001)6:4(254
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发表时间：
2001-08
影响因子：
3.6
通讯作者：
M. Barker
中科院分区：
文献类型：
--
作者：
M. Barker
现场测试对于评估现有桥梁是有价值的。它允许业主降低分析评级方法的保守性，并安全地对桥梁进行更高载荷的评级。设计中未考虑的许多因素对试验桥梁的响应有影响。其中几个，如实际负荷分布和额外的刚度从路边和栏杆，是受欢迎的好处，可用于增加额定负荷。然而，也有贡献的轴承约束力和意外的复合作用，可能是不可靠的桥梁的使用寿命。这些增加承载力的因素需要分离和量化，以便桥梁所有者能够：（1）确认可用效益的来源;（2）消除不必要的贡献。介绍了通过现场试验确定钢梁桥荷载等级的方法。一个系统的方法来分离和量化的贡献，从各种影响。因此，负责的工程师可以删除不必要的贡献，并证明实验额定负载。以一座三跨钢梁桥为例进行了验证。
Field testing is valuable for evaluating existing bridges. It allows the owner to reduce the conservatism of analytical rating methods and safely rate the bridge for higher loads. Many factors not considered in design contribute to the response of a tested bridge. Several of these, like actual load distribution and additional stiffness from curbs and railings, are welcome benefits that can be used to increase load ratings. However, there are also contributions from bearing restraint forces and unintended composite action that may not be reliable during the bridge's service life. These factors tending to increase the load capacity need to be separated and quantified so that the bridge owner can: (1) confirm the origin of the useable benefit; and (2) remove the unwanted contributions. Presented are procedures for load rating steel girder bridges through field testing. A systematic approach is presented to separate and quantify the contributions from various effects. Therefore, the responsible engineer can remove the unwanted contributions and justify an experimental load rating. The procedures are demonstrated for a three-span steel girder bridge.