Seismic performance of irregular bridges – comparison of different nonlinear static procedures
Seismic performance of irregular bridges – comparison of different nonlinear static procedures
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DOI：
10.1080/15732479.2014.983938
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发表时间：
2015-12
影响因子：
3.7
通讯作者：
M. Kohrangi;R. Bento;M. Lopes
中科院分区：
文献类型：
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作者：
M. Kohrangi;R. Bento;M. Lopes
交通基础设施的抗震性能对经济社会的正常运行具有重要意义。本文主要对这些基础设施中最重要的组成部分之一——桥梁进行抗震评估和分析。在这一领域，非线性静态过程（NSPs）得到了极大的关注，产生了不同的建议，以提高程序的准确性，同时保持其简单性。本研究的主要目的是对非规则钢筋混凝土高架桥的nsp适用性进行评估。通过(1)对三种著名的nsp （N2方法、模态推覆分析和自适应容量谱方法）的性能分析，以及(2)将该领域先前研究的范围扩展到最近的方法，即扩展的N2方法，来进行比较。因此，研究了一组具有不同不规则程度、结构和长度的桥梁。通过与非线性动力分析结果的比较，评价了不同非线性动力分析方法的精度。结果的比较证实了多模态nsp的可接受性能，并突出了扩展N2方法的简单性。
The adequate seismic performance of transportation infrastructures is important for the functioning of the economy and society. This paper focuses on the seismic assessment and analysis of one of the most important components of these infrastructures, the bridges. In this field, nonlinear static procedures (NSPs) have gained significant attention, resulting in different proposals to improve the accuracy of the procedures while keeping their simplicity. The main goal of this study is focused on the evaluation of the applicability of NSPs for irregular reinforced concrete viaducts. A comparative approach is pursued by resorting to (1) the analyses of the performance of three well-known NSPs (N2 method, modal pushover analysis and adaptive capacity spectrum method) and (2) the extension of the scope of previous studies in this field to a more recent method, the extended N2. As such, a set of bridges with different levels of irregularity, configurations and lengths is investigated. The accuracy of different NSPs is evaluated by comparing the results of NSPs with the ones obtained by means of nonlinear dynamic analyses. The comparison of results confirms the acceptable performance of the multi-modal NSPs and highlights the effectiveness of extended N2 method with respect to its simplicity.