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首页> 外文期刊>Bulletin of earthquake engineering >System versus component response of a two-span reinforced concrete bridge system
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System versus component response of a two-span reinforced concrete bridge system

机译：两跨钢筋混凝土桥梁系统的系统响应与组件响应

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A large-scale 20.5 m long asymmetric two-span reinforced concrete bridge was tested to failure using the shake table system at the University of Nevada Reno. Upon completion of testing, in depth analytical modeling was conducted to evaluate the accuracy of conventional methods in reproducing the bridge model response and to develop a model for further study. Utilizing the experimentally verified computer model, the system effect was investigated, comparing the system and response of individual bents as well as the response of several other bridge models. In comparing computational model of the shake table specimen and models of the individual bents with tributary mass, it was shown that for all of the columns in this study, there was generally not an increase in hysteretic energy or large displacement cycles from system response at given displacement demand. The response of the bents for each high amplitude test motion was also compared. It was shown that there were significant differences in the bent demands for a given excitation due to system effects. In addition to the shake table model, four bridge systems with a constant total lateral stiffness were used in a parametric study to determine the system effect. The symmetric and uniform versions of the bridge specimen were shown to be comparable in nonlinear performance to the bridge specimen for the same high amplitude demand. The failure progression of the bridge model and the analytical comparisons suggested that the reserve capacity from varied column heights could provide a beneficial substructure redundancy.
机译：内华达州里诺大学的振动台系统对大型20.5 m长的不对称两跨钢筋混凝土桥梁进行了测试，以测试其是否断裂。测试完成后，进行了深入的分析建模，以评估传统方法在重现桥梁模型响应中的准确性，并开发模型以供进一步研究。利用经过实验验证的计算机模型，研究了系统效果，比较了系统和单个弯头的响应以及其他几种桥梁模型的响应。通过比较振动台样品的计算模型和带有支路质量的单个弯头的模型，可以看出，对于本研究中的所有列，在给定的系统响应下，通常没有滞后能量增加或大位移循环排量需求。还比较了每个高振幅测试运动的弯曲响应。结果表明，由于系统效应，给定激励的弯曲需求存在显着差异。除了振动台模型之外，在参数研究中还使用了四个具有恒定总横向刚度的桥系统来确定系统效果。在相同的高振幅需求下，桥梁样本的对称和统一版本在非线性性能方面可与桥梁样本媲美。桥梁模型的失效进程和分析比较表明，不同柱高的储备能力可以提供有益的下部结构冗余。

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