桩基相邻桥梁之间的地震结构-土壤-结构相互作用 (SSSI):高度比的影响

IF 0.7 Q4 MECHANICS Studia Geotechnica et Mechanica Pub Date : 2024-03-30 DOI:10.2478/sgem-2024-0003
M. Alfach
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引用次数: 0

摘要

本文通过三维数值模拟,探讨了高度比对三座上部结构质量不同(Mst = 350、1050、350 t)的相邻桥梁的地震结构-土-结构相互作用(SSSI)的影响。针对不同的高度比(R = 1、1.1、1.15、1.2、1.25、1.5、2 和 3)进行了一系列全面的数值分析,以评估它们对上部结构加速度和基桩内力的影响。所研究的桥梁由嵌入非线性粘土中的桩群支撑。使用三维有限差分建模软件快速拉格朗日连续体分析(FLAC 3D)进行了数值模拟。研究结果表明,质量比的变化对上部结构加速度和桩内力的 SSSI 影响很大。值得注意的是,当质量比 R = 1.1 和 1.2 时,不利影响更为明显,导致弯矩、剪力和上部结构加速度分别增加高达 237.8%、291.4% 和 70.33%。相反,质量比 R = 3 会导致弯矩、剪力和上部结构加速度分别降低 72%、82.14% 和 81.13%。这意味着,精心布置不同质量的相邻结构可有效控制(SSSI)效应。
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Seismic Structure-Soil-Structure Interaction (SSSI) between piled neighboring bridges: Influence of height ratio
This paper explores the impact of height ratios on the seismic Structure-Soil-Structure Interaction (SSSI) for three adjacent bridges with varying superstructure masses (Mst = 350, 1050, 350 t) through 3D numerical simulations. A comprehensive series of numerical analyses has been conducted across different height ratios (R = 1, 1.1, 1.15, 1.2, 1.25, 1.5, 2, and 3) to assess their influence on superstructure acceleration and the internal forces within the foundation piles. The bridges under investigation are supported by groups of piles embedded in nonlinear clay. The numerical simulations were executed using fast Lagrangian analysis of continua in three dimensions (FLAC 3D), a three-dimensional finite differences modeling software. The findings revealed that variations in mass ratios significantly impact the SSSI effects on superstructure acceleration and pile internal forces. Notably, adverse effects were more pronounced for mass ratios of R = 1.1 and 1.2, leading to an increase in bending moment, shear force, and superstructure acceleration by up to 237.8%, 291.4%, and 70.33%, respectively. In contrast, a mass ratio of R = 3 resulted in a decrease in bending moment, shear force, and superstructure acceleration by up to 72%, 82.14%, and 81.13%, respectively. This implies that a careful arrangement of adjacent structures with different masses can be employed effectively to manage the (SSSI) effects.
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来源期刊
CiteScore
1.30
自引率
16.70%
发文量
20
审稿时长
16 weeks
期刊介绍: An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest: Constitutive relations for geomaterials (soils, rocks, concrete, etc.) Modeling of mechanical behaviour of heterogeneous materials at different scales Analysis of coupled thermo-hydro-chemo-mechanical problems Modeling of instabilities and localized deformation Experimental investigations of material properties at different scales Numerical algorithms: formulation and performance Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment Risk and reliability analysis Analysis of concrete and masonry structures Modeling of case histories
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