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首页> 外文期刊>Journal of bridge engineering >Experimental Evaluation of Bridge Column Foundation Rocking Behavior
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Experimental Evaluation of Bridge Column Foundation Rocking Behavior

机译：桥梁柱基础摇摆特性的实验评估

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摘要

An experimental study was conducted at the University of Nevada, Reno, on the seismic performance of horizontally curved steel plate girder bridges. A two-fifth scale, three-span highly curved bridge was constructed on four shake tables and subjected to earthquake motions. Bridge footings were free to uplift during seismic loading, and neoprene pads were placed underneath the footings to simulate soil effects. Prior studies on the effect of rocking foundation systems concluded that rocking has the ability to reduce the damage in bridge columns in addition to being a good source of damping through the soil inelastic behavior. This paper describes the results from the experiment on a complete bridge system designed with rocking foundations. The rocking behavior was able to considerably limit the damage in the columns and the residual displacement of the bridge under earthquake motions equivalent to 2.5 times the earthquake intensity for which the bridge was designed. For high earthquake intensities, instead of experiencing overturning, the effect of rocking decreased, causing damage in the plastic hinge regions similar to a fixed-base column behavior. However, the overall damage was still less than in a fixed-base column.
机译：在内华达大学里诺分校对水平弯曲的钢板箱梁桥的抗震性能进行了实验研究。在四个振动台上建造了一个二分之五比例，三跨度高度弯曲的桥梁，并进行了地震运动。在地震荷载作用下，桥脚可以自由抬升，氯丁橡胶垫被放置在脚底下以模拟土壤影响。先前对摇摆基础系统的影响的研究得出的结论是，摇摆不仅具有减少土壤非弹性行为的良好阻尼能力，而且还具有减少桥墩损坏的能力。本文介绍了在具有摇摆基础的完整桥梁系统上的实验结果。摇摆行为能够极大地限制柱子的损坏以及在地震运动下桥梁的残余位移，其等效于桥梁设计地震强度的2.5倍。对于高地震烈度，不是发生倾覆，而是减小了摇摆的影响，从而在塑料铰链区域造成了损坏，类似于固定基柱的行为。但是，整体损害仍然小于固定基数列。

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