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首页> 外文会议>Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments >Updated Dynamic Amplification Factors of Existing Short Span Bridge Considering the Debris Effects
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Updated Dynamic Amplification Factors of Existing Short Span Bridge Considering the Debris Effects

机译：考虑碎石效应的既有短跨径桥梁动力放大系数修正

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During extreme flooding events, submerged bridge components would encounter strong lateral fluid forces. With lateral flowing water, debris, such as sediments or tree branches can be transported along rivers and accumulate on submerged components. With debris accumulations, short span bridges are required to resist additional fluid pressure due to the increasing current-obstruction area. Besides, debris accumulations would accelerate bridge scour process, as well, due to increasing flow speeds. The floating debris can also directly impact bridge foundations and affect the dynamic behaviors. Many bridges collapse due to fluid forces and debris impacts during flooding events. Few studies have been conducted to investigate the structural behaviors of bridges considering the effects of debris. In the present study, the dynamic analysis for OSBs is conducted with the consideration of debris accumulations and debris impacts. Firstly, a short span OSB is simulated with foundation scour due to possible debris accumulations. Secondly, the fluid pressure applied to the OSB is updated considering an extra blocking area due to accumulated debris. The collision forces due to floating woody debris are also introduced into the analysis. Thirdly, the dynamic amplification factors with and without considering the effects of debris impacts are calculated and compared. Finally, some conclusions are drawn about how to simplify the effects of debris impacts on the dynamic responses of bridges.
机译：在极端洪水事件期间，水下桥梁组件将遇到强大的横向流体力。有了横向流动的水，沉积物或树枝等碎屑可以沿着河流运输，并积聚在水下组件上。由于碎屑堆积，短跨径桥梁需要抵抗由于电流阻塞面积增加而产生的额外流体压力。此外，由于流速的增加，泥石流堆积也会加速桥梁冲刷过程。漂浮物还会直接冲击桥梁基础，影响桥梁的动力特性。洪水期间，许多桥梁因流体力和碎片冲击而坍塌。考虑到碎片的影响，很少有研究调查桥梁的结构行为。在本研究中，OSB的动态分析是在考虑碎屑堆积和碎屑影响的情况下进行的。首先，由于可能的碎片堆积，利用基础冲刷模拟短跨度OSB。其次，考虑到堆积的碎屑造成的额外堵塞区域，更新了施加在OSB上的流体压力。分析中还引入了漂浮木屑产生的碰撞力。第三，计算并比较了考虑和不考虑碎片撞击影响时的动力放大系数。最后，就如何简化碎石冲击对桥梁动力响应的影响得出了一些结论。

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