本文選題：土-結(jié)構(gòu)動力相互作用 + 淺基礎(chǔ)　； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：土-結(jié)構(gòu)動力相互作用是結(jié)構(gòu)設(shè)計的重要因素,也是結(jié)構(gòu)動力響應(yīng)分析的關(guān)鍵問題。論文基于有限元方法,著重研究不同的土體條件、基礎(chǔ)形式對土-結(jié)構(gòu)的動力相互作用的影響,旨在探討適用于分析獨塔斜拉橋動力響應(yīng)的有限元模型。論文先后對淺基礎(chǔ)、樁基礎(chǔ)及某獨塔雙索面斜拉橋展開討論,研究內(nèi)容包括：1.基于彈性地基梁理論,采用子結(jié)構(gòu)法研究土-結(jié)構(gòu)動力相互作用,討論土體條件、基礎(chǔ)形式、基礎(chǔ)尺寸等對土-結(jié)構(gòu)系統(tǒng)動力剛度和阻尼的影響；2.介紹了現(xiàn)有淺基礎(chǔ)的土-結(jié)構(gòu)動力相互作用簡化分析模型,其中包括：固結(jié)模型、六彈簧模型和剛性盆式模型,對比分析現(xiàn)有模型對結(jié)構(gòu)動力響應(yīng)的影響,結(jié)果表明,由于剛性盆式模型同時考慮了基底剪力和基礎(chǔ)側(cè)面的被動土壓力,其理論基礎(chǔ)和計算結(jié)果更接近實際情況；3.介紹了樁基礎(chǔ)的土-結(jié)構(gòu)動力相互作用簡化分析模型,其中包括：嵌固模型、修正m法模型、剛性盆式模型,對比分析現(xiàn)有模型對結(jié)構(gòu)動力響應(yīng)的影響,結(jié)果表明,修正后的m法模型考慮了土層的分層,且沒有簡化群樁,對群樁的旋轉(zhuǎn)阻抗和阻尼的影響最小；4.將上述改進后的六彈簧模型和剛性盆式模型用于斜拉橋的動力響應(yīng)分析,分析中借用淺基礎(chǔ)的算法慮了承臺與土體的動力相互作用,同時也考慮樁基與土體的動力相互作用,對比分析可知,土-結(jié)構(gòu)動力相互作用對斜拉橋下塔柱和主梁橫向受力影響較大；矩形承臺的形狀、剛度對橋梁的動力分析有影響。
[Abstract]:Soil-structure dynamic interaction is an important factor in structural design and a key problem in structural dynamic response analysis. Based on the finite element method, this paper focuses on the influence of different soil conditions and foundation forms on the soil-structure dynamic interaction. The purpose of this paper is to explore a finite element model suitable for analyzing the dynamic response of single-tower cable-stayed bridges. In this paper, the shallow foundation, pile foundation and a single tower and double cable plane cable-stayed bridge are discussed successively. The research contents include: 1. Based on the theory of elastic foundation beam, the influence of soil condition, foundation form and foundation size on the dynamic stiffness and damping of soil-structure system is studied by substructure method. This paper introduces the existing simplified analysis models of soil-structure dynamic interaction of shallow foundation, including consolidation model, six-spring model and rigid basin model. The influence of the existing models on the dynamic response of the structure is compared and analyzed. Since the rigid basin model takes into account both the base shear force and the passive earth pressure on the side of the foundation, the theoretical basis and the calculated results are closer to the actual situation. This paper introduces the simplified analysis model of soil-structure dynamic interaction of pile foundation, including: embedded model, modified m model, rigid basin model. The influence of existing models on the dynamic response of structure is compared and analyzed. The modified m-method model considers the delamination of the soil layer and does not simplify the pile group, and the effect on the rotation impedance and damping of the pile group is minimal. The improved six-spring model and rigid basin model are applied to the dynamic response analysis of cable-stayed bridge. The dynamic interaction between pile cap and soil is considered by using the algorithm of shallow foundation in the analysis, and the dynamic interaction between pile foundation and soil is also considered. The comparison and analysis show that the soil-structure dynamic interaction has a great influence on the lateral force of tower column and main beam under cable-stayed bridge, and the shape and stiffness of rectangular cap have influence on the dynamic analysis of the bridge.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.3;TU435

【參考文獻】

相關(guān)期刊論文 前2條

1 姜忻良,黃艷,丁學(xué)成;相鄰建筑物-樁基-土相互作用[J];土木工程學(xué)報;1995年05期

2 陳云敏,陳仁朋,朱斌;打樁過程中樁的橫向振動分析[J];振動工程學(xué)報;2001年02期

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本文編號：1782064