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介绍新泽西州三座多跨简支桥的地震响应。主要目标是确定各种构件的承载力/需求比以评估地震的易损性和研究修复策略。另外一个主要目标是研究这些响应特性的效果,对这类桥的地震性能分析上响应特性是唯一的。此外,考虑桥与桥墩之间的刚性界面,对建模方法的效果和采用现有的需求曲线进行推覆分析的适当性也进行分析。研究包括具有代表性的三座2～4跨桥的非线性时程分析,这类桥在新泽西州和美国东部普遍存在。为了评估建模的效果,2维和3维建模分别被应用。许多参数被证明对多跨简支桥梁的地震响应有重大影响,例如,土与结构物的相互作用、邻跨之间的影响、钢支座和桥墩的可塑性。因此,根据综合参数研究,通过采用承载力/需求比对关键元素的量化,评估多跨简支桥的地震响应。此外,对与地震评估、修复和多跨简支桥设计有关的研究也进行了论述。
Describe the seismic response of three multi-span simply supported bridges in New Jersey. The main objective is to determine the bearing capacity / demand ratio of various components to assess the vulnerability of earthquakes and to study repair strategies. Another major goal is to study the effects of these response characteristics, which are unique to the seismic response characteristics of such bridges. In addition, considering the rigid interface between the bridge and piers, the effectiveness of the modeling method and the appropriateness of the pushover analysis using the existing demand curves are also analyzed. The study includes the representative three-time nonlinear analysis of two to four bridges, which are common in New Jersey and the eastern United States. In order to assess the effect of modeling, two-dimensional and three-dimensional modeling were applied. Many parameters have been shown to have a significant impact on the seismic response of multi-span bridges, for example, soil-structure interaction, inter-span impact, plasticity of steel supports and piers. Therefore, based on a comprehensive parametric study, the seismic responses of multi-spanned bridges are evaluated by quantifying the key elements using the bearing capacity / demand ratio. In addition, studies related to seismic assessment, restoration and design of multi-span bridges are also discussed.