基于非线性静态分析和软件的公路桥抗震评估
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摘要
受地震扰动时,可以通过一系列方法对桥的响应进行评估。传统的方法是采用线性静态或动态分析结合适当的修正来说明非弹性响应,而现行的实践着重强调非线性静态分析方法。本研究采用线性动态分析程序,对两跨公路桥的初步地震响应进行分析以确定潜在的非弹性响应。按照两个非线性静态分析方法对桥进行分析,评估了两种方法所预测的全部响应的差别以及采用各种软件进行非线性静态分析的效率。结果显示:所采用的两种不同非线性响应预测的非线性静态分析方法,由于存在大量的简化,都不能获得正确的结果。此外,研究还揭示在综合分析和提供破坏过程图方面,一些软件更适合进行非线性静态分析(如塑性铰的性能)。
The response of bridges when subjected to seismic excitation can be evaluated by a number of analysis methods . The traditional approach is to employ linear static or dynamic analyses coupled with appropriate modifiers to account for inelastic response while current design practice is moving towards anincreased emphasis on nonlinear static analysis methods . In this study , a preli minary seismic response analysis of a two-span highway bridge was perfor med using linear dynamic analysis procedures to identify the potential for inelastic response . The bridge was subsequently analyzed in accordance with two nonlinear static analysis methods in an effort to evaluate the difference inglobal response predicted by the two methods andthe effectiveness of various soft ware programs for perfor ming non- linear static analysis .The results demonstrated that ,for the two nonlinear static analysis methods used in this study , different predictions of nonlinear response occurred with neither method being regarded as producing correct results due to a number of simplifications inherent in the methods . Further more ,the analysis revealed that some soft ware programs are well suited to perfor ming nonlinear static analysis ,both fromthe point-of-view of perfor ming comprehensive analyses and providing a graphical depiction of the evolution of damage (i .e .the behaviour of plastic hinges) .
The response of bridges when subjected to seismic excitation can be evaluated by a number of analysis methods . The traditional approach is to employ linear static or dynamic analyses coupled with appropriate modifiers to account for inelastic response while current design practice is moving towards anincreased emphasis on nonlinear static analysis methods . In this study , a preli minary seismic response analysis of a two-span highway bridge was perfor med using linear dynamic analysis procedures to identify the potential for inelastic response . The bridge was subsequently analyzed in accordance with two nonlinear static analysis methods in an effort to evaluate the difference inglobal response predicted by the two methods andthe effectiveness of various soft ware programs for perfor ming non- linear static analysis .The results demonstrated that ,for the two nonlinear static analysis methods used in this study , different predictions of nonlinear response occurred with neither method being regarded as producing correct results due to a number of simplifications inherent in the methods . Further more ,the analysis revealed that some soft ware programs are well suited to perfor ming nonlinear static analysis ,both fromthe point-of-view of perfor ming comprehensive analyses and providing a graphical depiction of the evolution of damage (i .e .the behaviour of plastic hinges) .
引文
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