深软场地上考虑土-结构相互作用的斜拉桥被动控制分析
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摘要
结合某一工程,采用软土粘塑性动力本构模型,在合理模拟深软场地非线性基础上讨论土-结构动力相互作用对斜拉桥被动控制效果的影响。利用软件ABAQUS建立了深软场地-桩基-斜拉桥三维有限元模型,作为对比,建立了深软场地上不考虑土-结构动力相互作用的常规刚性地基模型,通过时程分析法计算斜拉桥地震反应。计算结果表明:深软场地上考虑土-结构动力相互作用后,斜拉桥被动控制效果下降;在刚性地基上取得良好减震效果的被动控制手段若照搬至柔性地基上,可能不仅减震效果不好,还会给桥梁结构增加内力负担。
In the light of a specific project,a new viscous plastic model of soil is proposed.An analysis of vibration passive control of cable-stayed bridge considering soil-structure interaction is conducted.Both the cable-stayed bridge analytic models with considering rigid foundation and thick soft site-pile foundation are built up by using software ABAQUS.The seismic responses of the two bridge models are analyzed by using time history analysis.The results show that the passive control effect decreases with considering soil-structure interaction and if the passive control designed for bridges on rigid foundation is used to bridges on soft soil foundation,it can make negative effect on the inner force of the bridge.
In the light of a specific project,a new viscous plastic model of soil is proposed.An analysis of vibration passive control of cable-stayed bridge considering soil-structure interaction is conducted.Both the cable-stayed bridge analytic models with considering rigid foundation and thick soft site-pile foundation are built up by using software ABAQUS.The seismic responses of the two bridge models are analyzed by using time history analysis.The results show that the passive control effect decreases with considering soil-structure interaction and if the passive control designed for bridges on rigid foundation is used to bridges on soft soil foundation,it can make negative effect on the inner force of the bridge.
引文
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[5]张博.深软场地上考虑SSI效应时斜拉桥地震反应及被动控制研究[D].南京:南京工业大学,2008.
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[2]叶爱君,华新,韩大章.灌河大桥抗震性能研究[J].公路,2005,12(11):48-51.
[3]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.
[4]庄海洋,陈国兴,朱定华.土体动力粘塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,28(10):33-37.
[5]张博.深软场地上考虑SSI效应时斜拉桥地震反应及被动控制研究[D].南京:南京工业大学,2008.
[6]丁兆铭,王立新.刚性墩台桩基础的等刚度模拟[J].水利水电科技进展,1999,15:22-26.
[7]李靖森.桥梁结构综合计算中柔性深基础支撑模型的建立[J].公路,1994,(4):1-6
[8]胡庆安,崔刚,刘健新.粘滞阻尼器在斜拉桥减震设计中的应用[J].公路,2006,7(8):1-5.
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