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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Investigation of 'equal displacement' rule for bridges subjected to differential support motions
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Investigation of 'equal displacement' rule for bridges subjected to differential support motions

机译：差异支撑运动作用下桥梁“等位移”规律的研究

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The 'equal displacement' rule is employed in seismic design practice to predict inelastic displacements from analyses of the corresponding linear elastic structural models. The accuracy and limitations of this rule have been investigated for ordinary structures but not for bridges subjected to spatially varying ground motions. The present study investigates this rule for moderate levels of inelastic behavior for four highway bridges in California accounting for the effects of spatial variability of the support motions due to incoherence, wave passage and differential site response. The bridge models vary significantly as to their fundamental periods and their overall configurations. Statistical analyses of pier-drift responses are performed using as input simulated arrays of nonstationary ground motions in accordance with prescribed coherency models. It is found that the 'equal displacement' rule is fairly accurate for cases when the fundamental period of the bridge is longer than the transition period between the acceleration-controlled and velocity-controlled ranges of the response spectrum. Otherwise, the rule is non-conservative for cases with large ductility factors and conservative for cases with small ductility factors. Wave passage and incoherence tend to reduce ratios of mean peak inelastic to elastic pier drifts, whereas incorporation of the differential site-response effect by locating piers on softer soils tends to increase the same ratios. Mild or moderate positive correlation between these ratios and ductility demands is observed in most cases. Effects of spatial variability are more pronounced for longer and stiffer bridges.
机译：在地震设计实践中采用“等位移”法则，通过对相应的线性弹性结构模型的分析来预测非弹性位移。已经针对普通结构而不是经受空间变化地震动的桥梁研究了该规则的准确性和局限性。本研究调查了加利福尼亚州四座公路桥梁的中等水平非弹性行为规则，该规则解释了由于不连贯，波浪通过和不同的场地响应而引起的支撑运动的空间变异性。桥梁模型的基本周期和整体配置差异很大。根据规定的相干性模型，使用非平稳地面运动的模拟数组作为输入，对墩台漂移响应进行统计分析。发现当桥的基本周期长于响应谱的加速度控制范围和速度控制范围之间的过渡时间时，“等位移”法则是相当准确的。否则，该规则对于延性因子较大的情况是不保守的，而对于延性因子较小的情况则是保守的。波浪通过和不连贯往往会降低平均峰值非弹性与弹性桥墩漂移的比率，而通过将桥墩定位在较软的土壤上而引入差分点响应效应往往会增加相同的比率。在大多数情况下，这些比率与延性需求之间存在轻度或中度正相关。对于更长和更坚固的桥梁，空间可变性的影响更为明显。

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