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首页> 外文期刊>Bulletin of earthquake engineering >Effects of uncertain characteristic periods of ground motions on seismic vulnerabilities of a continuous track-bridge system of high-speed railway
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Effects of uncertain characteristic periods of ground motions on seismic vulnerabilities of a continuous track-bridge system of high-speed railway

机译：近距离特征期对高速铁路连续轨道桥系统地震脆弱性的影响

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摘要

The high-speed railway in China has to pass through the site surrounded by several known faults. Different earthquake mechanics of those faults and propagation paths cause different ground motions, including different peak ground accelerations (PGA), durations and characteristic periods, acting on the high-speed railway bridges. However, the previous seismic vulnerability analysis mainly aimed at the influence of PGA instead of characteristic periods on the seismic fragilities of bridge structure rather than track-bridge system. By taking a typical and common continuous bridge recommended in Chinese criterion as example, the effects of the uncertain characteristic periods of ground motions on the seismic responses and fragilities of track-bridge system were analyzed based on a numerical method. The results indicate that the probabilities exceeding any damage state of most components, including the bridge and track parts, increase with the characteristic period of ground motions. The uncertain characteristic periods of ground motions should be fully considered for the seismic design of track-bridge system, especially when the uncertain characteristic periods change around a small value. In the seismic vulnerability analysis, the uncertain of the designed characteristic period of ground motions should be developed by considering the different earthquake mechanics of several known faults surrounding the bridge site and the complex propagation paths of ground motion waves through different soils. Using a constant characteristic period of ground motions only considering the soil profile at the local site of bridge possibly leads to an unsafe result in the current criterion.
机译：中国的高速铁路必须通过几个已知的故障包围的网站。这些故障和传播路径的不同地震力学导致不同的地面运动，包括不同的峰接地加速度（PGA），持续性和特征时期，作用于高速铁路桥。然而，以前的地震脆弱性分析主要针对PGA的影响而不是桥梁结构的地震脆性的影响而不是轨道桥系统的影响。通过以典型的和常见的连续桥推荐在中文标准中，作为示例，基于数值方法分析了地面运动对地面运动的不确定特征时期的影响。结果表明，概率超过大多数部件的任何损坏状态，包括桥接和轨道部件，随着地面运动的特征期而增加。应充分考虑轨道桥系统的地震设计的地面运动的不确定特征期，特别是当不确定的特征时期改变少量值时。在地震脆弱性分析中，应通过考虑桥接现场周围的几种已知故障的不同地震力学和地面运动波的复杂传播路径来开发设计特征的地面运动周期的不确定。使用恒定的地面运动周期仅考虑桥梁当地部位的土壤轮廓可能导致不安全的结果在当前标准中。

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