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equivalent linearity method
相关语句
  等效线性化方法
     The interaction system as an integrality is modeled by some finite elements and the dynamic nonlinearity of soils is considered through the equivalent linearity method.
     将土与群桩体系视为一个整体进行有限元离散,采用等效线性化方法考虑土体的动力非线性性能。
短句来源
     The dynamic nonlinearity of soils is considered through the equivalent linearity method.
     土体动力非线性性能采用等效线性化方法考虑。
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Dynamic interaction effects of a supergiant pier-pile group-soil system are investigated by a stochastic seismic response method.A complex response technique is employed in this method.The interaction system as an integrality is modeled by some finite elements and the dynamic nonlinearity of soils is considered through the equivalent linearity method.Stochastic seismic analysis of the free ground and the interaction system are carried out respectively and their results are compared.The comparisons indicate...

Dynamic interaction effects of a supergiant pier-pile group-soil system are investigated by a stochastic seismic response method.A complex response technique is employed in this method.The interaction system as an integrality is modeled by some finite elements and the dynamic nonlinearity of soils is considered through the equivalent linearity method.Stochastic seismic analysis of the free ground and the interaction system are carried out respectively and their results are compared.The comparisons indicate that the effects of interaction are related to the modulus variance of pile and soil,and the distance of soil and pile foundation.The dynamic shear strains of soft soils have significant difference.The distributions of shear strains near the both boundaries of pile group appear to be curved.The peak acceleration values of ground surface and superficial layer obtained from seismic interaction analysis are smaller than that obtained from seismic free ground analysis.But,the peak acceleration values of deep layers have increases of 5%~30%.In addition,the frequency components of ground surface motions have marked difference for seismic responses of free ground and interaction system.Therefore,the dynamic bridge structure-pile group-soil interaction should be considered properly for the seismic design of bridge foundations.

考虑地震动的随机性,利用复反应分析技术,采用随机地震反应计算方法对某一特大型桥梁群桩基础与土动力相互作用效应进行了数值试验研究。将土与群桩体系视为一个整体进行有限元离散,采用等效线性化方法考虑土体的动力非线性性能。将桥墩-群桩-土相互作用体系与自由场随机地震反应进行比较,结果表明:相互作用效应的影响与桩土模量差异以及土体与群桩基础距离有关。软土层剪应变水平及分布发生了显著变化,群桩基础两侧附近土域剪应变呈现明显的弧形分布;地表及浅层土体最大地震加速度反应有所减小,但覆盖层中下部土体加速度反应峰值明显增大,增幅达5%~30%左右;此外,地震地面运动的频谱成分存在显著差别。桥梁桩基础抗震设计中应充分考虑桥梁结构-群桩-土相互作用效应。

Dynamic interaction effects of a giant pier-pile group-soil system are investigated by a stochastic seismic response method.A complex response technique is employed in this method.The interaction system as an integrality is modeled by some finite elements and the dynamic nonlinearity of soils is considered through the equivalent linearity method.Stochastic seismic analysis of the free ground and the interaction system are carried out respectively;and their results are compared.The comparisons indicate...

Dynamic interaction effects of a giant pier-pile group-soil system are investigated by a stochastic seismic response method.A complex response technique is employed in this method.The interaction system as an integrality is modeled by some finite elements and the dynamic nonlinearity of soils is considered through the equivalent linearity method.Stochastic seismic analysis of the free ground and the interaction system are carried out respectively;and their results are compared.The comparisons indicate that the effects of interaction are related to the modulus variance of pile and soil,and the distance of soil and pile foundation.The dynamic shear strains of soft soils have significant difference.The distributions of shear strains near the both boundaries of pile group appear to be curved.The peak acceleration values of ground surface and superficial layer obtained from seismic interaction analysis are smaller than that obtained from seismic free ground analysis.But,the peak acceleration values of deep layers have increases of 5%-30%.In addition,the frequency components of ground surface motions have marked difference for seismic responses of free ground and interaction system.Therefore,the dynamic bridge structure-pile group-soil interaction should be considered properly for the seismic design of bridge foundations.

考虑地震动的随机性,利用复反应分析技术,采用随机地震反应计算方法对某一特大型桥梁群桩基础与土动力相互作用效应进行了数值试验研究。将土与群桩体系视为一个整体进行有限元离散,采用等效线性化方法考虑土体的动力非线性性能。将桥墩-群桩-土相互作用体系与自由场随机地震反应进行比较,结果表明:相互作用效应的影响与桩土模量差异以及土体与群桩基础距离有关;软土层剪应变水平及分布发生了显著变化,群桩基础两侧附近土域剪应变呈现明显的弧形分布;地表及浅层土体最大地震加速度反应有所减小,但覆盖层中下部土体加速度反应峰值明显增大,增幅达5%~30%左右;此外,地震地面运动的频谱成分存在显著差别。桥梁桩基础抗震设计中应充分考虑桥梁结构-群桩-土相互作用效应。

The giant pile group foundation of the Su-Tong Bridge located on the Yangtze River is selected to be the subject investigated.The seismic excitation is regarded as stationary stochastic process considering the uncertainties of real seismogram.A stochastic seismic response method,in which the complex response technique is employed,is applied to study the dynamic responses of this pile group foundation with a large pier cap.The dynamic nonlinearity of soils is considered through the equivalent linearity method.During...

The giant pile group foundation of the Su-Tong Bridge located on the Yangtze River is selected to be the subject investigated.The seismic excitation is regarded as stationary stochastic process considering the uncertainties of real seismogram.A stochastic seismic response method,in which the complex response technique is employed,is applied to study the dynamic responses of this pile group foundation with a large pier cap.The dynamic nonlinearity of soils is considered through the equivalent linearity method.During a seismic motion,the displacements along depths of pile shaft appear triangle because of inertia force of pier and weak restraint of soft soil.The displacement of soil is related to the distance between soil and pile foundation.The effects of pier-pile-soil interaction on displacement response of the soil surrounding the pile foundation are significant.The effected range is about 1.5 times width of pile foundation.The internal force responses of piles indicate that the bending moments and shear forces of pile head and upper portion of pile shaft are larger relatively.The shear force of outer piles is marked larger than that of center piles.In addition,based on the principle of intensity damage,the dynamic reliabilities of the pile foundation are analyzed under four different yield shear force levels.

以苏通长江大桥主墩特大型群桩基础为研究背景,考虑地震动的不确定性,将地震激励作为平稳随机过程,采用随机地震反应分析方法,对深厚场地上群桩基础受上部桥墩荷载下的地震反应进行研究。土体动力非线性性能采用等效线性化方法考虑。由于桥墩惯性作用以及软土土层对桩身位移的约束作用,地震激励下桩身位移呈三角形分布。土体位移与土体和基础间距离有关,桥墩-桩-土相互作用对基础两侧1.5倍基础宽度的土体位移有较大影响。桩体内力反应结果表明,桩顶及桩身上部剪力及弯矩均较大,边桩剪力显著大于中间桩剪力。此外,基于强度破坏准则,对以桩身屈服剪力作为控制指标的群桩基础动力可靠性进行了分析。

 
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