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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic design of bridges accounting for spatial variability of ground motion
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Seismic design of bridges accounting for spatial variability of ground motion

机译：考虑地面运动空间变异的桥梁抗震设计。

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The effects of the spatial variability of the ground motion on the response of bridge structures are investigated in this study. Following a well-established convention, the phenomenon is represented as the combined effect of three causes: the loss of coherence of the motion with distance, the wave-passage, and the local site conditions. Since the nature and amount of non-synchronism vary within ample limits a statistical approach is adopted. A parametric study is carried out on a representative set of bridges subjected to carefully selected combinations of the factors inducing spatial variability. The investigation has shown that the phenomenon affects the response considerably and, hence, the level of protection of these structures. It is observed that for all bridge types considered, the ductility demands at the base of the piers in the presence of spatial variability increase in the majority of cases. Further, for a given bridge type, the probabilities of failure vary by more than one order of magnitude depending on the combination of the parameters. Attention has been focused on a parameter representing the ratio between the maximum curvature ductility demand and the same quantity for the case of fully synchronous motion. This parameter has been used to correct the conventional synchronous design procedure by increasing the available ductility. The re-analysis of all the cases with a modified ductility capacity shows that the procedure is effective in reducing the fragilities to the values corresponding to synchronous input.
机译：在这项研究中，研究了地面运动的空间变异性对桥梁结构响应的影响。遵循公认的惯例，该现象表示为三个原因的综合影响：运动与距离，波通路和局部位置条件的连贯性损失。由于非同步的性质和数量在足够的范围内变化，因此采用了统计方法。对一组具有代表性的桥梁进行了参数研究，这些桥梁要经过精心选择的诱发空间变异性因素的组合。调查表明，该现象在很大程度上影响了响应，因此也影响了这些结构的保护水平。可以看出，对于所有考虑的桥梁类型，在大多数情况下，在存在空间可变性的情况下，桥墩底部的延性要求都增加了。此外，对于给定的桥梁类型，取决于参数的组合，失效的概率会变化一个以上数量级。对于完全同步运动的情况，注意力集中在代表最大曲率延性要求和相同量之间的比率的参数上。通过增加可用延展性，此参数已用于校正常规同步设计过程。对所有延性能力已修改的案例进行的重新分析表明，该程序可有效地将脆弱性降低至与同步输入对应的值。

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