【摘要】：土與結(jié)構(gòu)動力相互作用問題是土木工程和地震工程領(lǐng)域中的熱點、難點課題,由于地震發(fā)生的隨機性與難以預測性,使得地震作用下土與結(jié)構(gòu)動力相互作用的理論仍不完善。 依托海城市中心醫(yī)院工程,圍繞地震作用下土與結(jié)相互作用關(guān)系進行深入研究,通過理論分析與數(shù)值模擬手段相結(jié)合,重點研究了樁土動力接觸本構(gòu)模型,構(gòu)建了海城市中心醫(yī)院工程地震反應有限元模型,分析了不同地震波作用影響下考慮土與結(jié)構(gòu)相互作用的結(jié)構(gòu)動力反應,給出了一種合理實用的高層建筑土與結(jié)構(gòu)相互作用地震反應分析的簡化方法。具體工作如下： (1)對海城市中心醫(yī)院工程結(jié)構(gòu)進行合理簡化,將地下結(jié)構(gòu)樓板簡化為剛性樓板；將地上結(jié)構(gòu)等效成梁柱體系,采用質(zhì)量與剛度折減方法將樓板簡化成梁系；確定了土體、結(jié)構(gòu)在有限元分析中的單元模型與本構(gòu)模型,構(gòu)建了合理的考慮在地震作用影響下土與結(jié)構(gòu)相互作用有限元模型,同時選定用增量迭代混合法求解非線性動力方程。 (2)分析ANSYS軟件中的接觸單元計算原理,針對其中缺陷,在考慮樁土分離、滑移效應的基礎(chǔ)上,考慮動力作用中的基礎(chǔ)提離效應,并引入阻尼成分考慮樁土動力接觸中的能量損耗,給出了一種改進的二維和三維樁土動力接觸本構(gòu)模型,并推導了其相應的接觸單元的單元剛度矩陣。隨后進行了算例驗證,說明優(yōu)化的樁土動力接觸本構(gòu)模型可以應用在地震作用下樁土相互作用分析中,為后續(xù)的結(jié)構(gòu)地震反應分析提供了必要的理論依據(jù)。 (3)采用優(yōu)化后的樁土動力接觸本構(gòu)模型,建立考慮土與結(jié)構(gòu)相互作用海城市中心醫(yī)院工程的三維動力分析模型,模擬輸入天津波、Taft波和人工波在不同加速度幅值作用下結(jié)構(gòu)加速度、位移和地下結(jié)構(gòu)應力變化以及地基土體應力的變化情況。得出對海城市中心醫(yī)院工程結(jié)構(gòu)地震反應影響最大的為天津波,其次為Taft波,影響最小的為人工波；整體結(jié)構(gòu)在地震作用下的最大位移值符合《建筑抗震設(shè)計規(guī)范》(GB50011-2010)要求,具備較好的抗震性能。地上結(jié)構(gòu)在地震作用下加速度值與位移值要大于地下結(jié)構(gòu),彎矩最大值出現(xiàn)在地下結(jié)構(gòu)一層樁柱頂端與地下結(jié)構(gòu)二層樁柱底端,是地下結(jié)構(gòu)中安全系數(shù)最小處,需要引起設(shè)計人員足夠重視。 (4)以考慮地震作用下土與結(jié)構(gòu)相互作用的海城市中心醫(yī)院工程三維有限元計算結(jié)果為依據(jù),并參考《動力機器基礎(chǔ)設(shè)計規(guī)范》(GB50040-96)中兩層質(zhì)-彈-阻模型,隨后對兩層質(zhì)-彈-阻模型中的地基質(zhì)量、抗剪剛度、土體模型自由度和阻尼比等因素進行修正,給出了修正的多層質(zhì)-彈-阻模型,給出了地震作用下土與結(jié)構(gòu)相互作用的地基基礎(chǔ)簡化分析方法。
[Abstract]:Soil-structure dynamic interaction is a hot and difficult problem in civil engineering and seismic engineering. Due to the randomness and unpredictability of earthquake occurrence, the theory of soil-structure dynamic interaction under earthquake is still imperfect. Based on the Haicheng central hospital project, the interaction between soil and soil under earthquake is studied in depth. The dynamic contact constitutive model of pile and soil is studied by combining theoretical analysis with numerical simulation. The finite element model of seismic response in Haicheng central hospital is constructed, and the structural dynamic response considering the interaction between soil and structure under the influence of different seismic waves is analyzed. A reasonable and practical simplified method for seismic response analysis of soil-structure interaction in high-rise buildings is presented. The specific work is as follows: (1) the engineering structure of Haicheng central hospital is reasonably simplified, the underground structure floor is simplified to rigid floor slab, and the above floor structure is equivalent to Liang Zhu system. The method of mass and stiffness reduction is used to simplify the beam system of floor slab, the element model and constitutive model of soil mass and structure in finite element analysis are determined, and the finite element model of soil-structure interaction under the influence of earthquake is constructed. At the same time, the incremental iterative mixing method is chosen to solve the nonlinear dynamic equation. (2) the principle of contact element calculation in ANSYS software is analyzed. Considering the defects, the pile-soil separation and slip effect are considered. Considering the foundation lift effect in dynamic action and introducing damping component into consideration of energy loss in pile-soil dynamic contact, an improved two-dimensional and three-dimensional pile-soil dynamic contact constitutive model is presented. The element stiffness matrix of the contact element is derived. A numerical example shows that the optimized pile-soil dynamic contact constitutive model can be applied to the pile-soil interaction analysis under earthquake. It provides the necessary theoretical basis for the subsequent structural seismic response analysis. (3) using the optimized pile-soil dynamic contact constitutive model, a three-dimensional dynamic analysis model considering the interaction between soil and structure is established for the Haicheng central hospital project. The structural acceleration, displacement, stress change of underground structure and the stress change of foundation soil are simulated under different acceleration amplitudes of input Tianjin wave Taft wave and artificial wave. It is concluded that Tianjin wave, Taft wave and artificial wave have the greatest influence on the seismic response of the engineering structure of Haicheng Central Hospital, and the maximum displacement value of the whole structure under earthquake action conforms to the requirements of the Code for Seismic Design of buildings (GB50011-2010). Good seismic performance. The acceleration and displacement values of the above ground structure under earthquake are greater than those of the underground structure, and the maximum bending moment appears at the top of the pile column of the first story of the underground structure and the bottom of the two-story pile column of the underground structure, which is the minimum safety factor in the underground structure. It is necessary for designers to pay enough attention to it. (4) based on the three-dimensional finite element calculation results of Haicheng central hospital engineering considering the interaction between soil and structure under earthquake action, With reference to the two-layer mass-elastic-resistive model in the Code for Design of dynamic Machine Foundation (GB50040-96), the factors such as foundation mass, shear stiffness, degree of freedom of soil model and damping ratio in the two-layer mass-elastic-resistance model are modified. A modified multilayer silt-elastic-resistance model is presented, and a simplified analysis method of soil-structure interaction under earthquake is given.
【學位授予單位】：遼寧工程技術(shù)大學
【學位級別】：博士
【學位授予年份】：2013
【分類號】：TU311.3;TU435

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