本文選題：大型渡槽　切入點：流固耦合　出處：《華南理工大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：本文針對現(xiàn)有各類模型的局限性及存在的問題，提出了大型渡槽的二維半流固耦合模型。以簡支U型渡槽為研究對象，采用二維半流固耦合模型進行了靜力和動力數(shù)值計算分析，通過與三維模型計算結(jié)果進行對比分析，證明了該二維半流固耦合模型在渡槽的動、靜力分析中均可獲得較好的計算結(jié)果。通過對受到橫向地震荷載的多跨聯(lián)合大型渡槽進行流固耦合分析，研究了梁式渡槽槽身在橫向地震荷載下的扭轉(zhuǎn)效應(yīng)。以支撐不等高的三跨大型梁式渡槽作為研究對象，研究了其在水平正交雙向地震作用下的結(jié)構(gòu)響應(yīng)分析。本文進行了以下研究工作，并得到了一些有意義的結(jié)論： （1）提出大型渡槽的二維半流固耦合模型。大型渡槽的二維半流固耦合模型是在已有的大型渡槽的流固耦合建模方法的基礎(chǔ)上，針對目前不同計算模型存在的缺陷，在流固耦合理論以及結(jié)構(gòu)動力學(xué)理論的基礎(chǔ)上，按照平面問題與空間問題相結(jié)合的方法，提出的一種更好的流固耦合模型。本模型可有效降低非線性流固耦合求解的方程自由度，使得運算效率極大地提高，適用于實際工程應(yīng)用中的多跨聯(lián)合渡槽大規(guī)模求解。 （2）采用二維半流固耦合模型對大型渡槽進行了靜力計算分析。以簡支U型渡槽為研究對象，，采用二維半流固耦合模型進行了靜力數(shù)值計算分析。本文提出的二維半流固耦合模型，在靜力作用下，可很好地模擬三維渡槽結(jié)構(gòu)的槽身以及支撐的位移以及內(nèi)力，也可以很好地模擬三維渡槽結(jié)構(gòu)的殼槽內(nèi)內(nèi)水壓力，并可以很好地反映耦合作用的三維效應(yīng)。因此，本文模型可以滿足工程實踐中渡槽靜力計算的精度要求。合理地設(shè)置二維流固耦合片的數(shù)目可以達到良好的靜力模擬效果。 （3）采用二維半流固耦合模型對大型渡槽進行了動力計算分析。以簡支U型渡槽為研究對象，在靜力分析基礎(chǔ)上，采用二維半流固耦合模型進行了動力數(shù)值計算分析。本文提出的二維半流固耦合模型，在動力作用下，可較好地模擬三維渡槽結(jié)構(gòu)的槽身以及支撐的位移以及內(nèi)力變化規(guī)律，也可以較好地模擬三維渡槽結(jié)構(gòu)的殼槽內(nèi)內(nèi)水壓力變化規(guī)律，并可以較好地反映耦合作用的三維效應(yīng)。因此，本文模型可以滿足工程實踐中渡槽動力計算的精度要求；而且，本文提出的二維半流固耦合模型保持了較高的計算效率，便于工程利用。 （4）對大型渡槽的槽身地震扭轉(zhuǎn)效應(yīng)進行了研究。針對渡槽兩端支撐剛度的不同、支撐條件的差異是否會導(dǎo)致渡槽的槽身結(jié)構(gòu)發(fā)生不利的扭轉(zhuǎn)問題進行研究。在不同地震波激勵作用下，支撐剛度差異對槽身跨端扭矩的影響程度不同，在工程分析中，需要考慮不同地震激勵荷載的周期特性差異。在渡槽的設(shè)計中，對于簡支梁式渡槽，用來設(shè)計整個槽身的控制條件一般可以采用跨中截面的內(nèi)力。在地震過程中，由于跨中截面的應(yīng)力最大，以跨中截面的內(nèi)力作為控制條件來設(shè)計整個槽身是可以滿足抗震要求的。 （5）對大型渡槽槽身的水平雙向地震響應(yīng)進行了研究。以支撐不等高的三跨大型梁式渡槽作為研究對象，利用有限元分析軟件ADINA，采用時程分析方法和流固耦合有限元計算方法，研究了其在水平正交雙向地震作用下的結(jié)構(gòu)響應(yīng)。水平雙向地震作用下，渡槽槽身的豎向位移和變形、豎向彎矩與橫向地震動單獨作用下的差別不大，受縱向地震動的影響較小。相比較縱向或橫向地震動單獨作用，在水平雙向地震同時作用下，槽身截面最大主應(yīng)力的增大較明顯，因此，在進行槽身局部設(shè)計時，應(yīng)該將水平雙向地震作用納入考慮。
[Abstract]:In this paper, aiming at the limitations of various kinds of models and existing problems, put forward the two-dimensional aqueduct of semi fluid solid coupling model. With the simple U type aqueduct as the research object, using a two-dimensional semi fluid solid coupling model of numerical calculation and analysis of static and dynamic, and the 3D model calculation results were analyzed to prove the two dimensional fluid solid coupling model in aqueduct dynamic, static analysis can get good results. Based on the lateral seismic loads by multi span large aqueduct of fluid solid coupled analysis of beam type aqueduct in the lateral torsion effect under earthquake loading. With the three span large aqueduct support unequal height as the research object, the research on the two directional horizontal earthquake under the orthogonal structure response analysis. This paper carried out the following research work, and obtained some meaningful conclusions:
(1) the large aqueduct half dimensional fluid solid coupling model. The two-dimensional aqueduct of semi fluid solid coupling model is based on solid coupling modeling method in large scale aqueduct existing flow, in order to overcome the disadvantages of different calculation models, based on fluid solid coupling theory and dynamic theory, according to the method plane and space combination, coupled with a better flow model. The proposed model can effectively reduce the nonlinear fluid solid coupling equation of degree of freedom, the operation efficiency is greatly improved, which is suitable for the actual project for solving large scale multi span combined with the aqueduct.
(2) using a two-dimensional semi fluid solid coupling model of static analysis of large aqueduct. The aqueduct simply supported U as the research object, using a two-dimensional semi fluid solid coupling model for numerical calculation and analysis of static. This paper proposed two dimensional semi fluid solid coupling model under static loads, and can well simulate the 3D aqueduct trough body and supporting the displacement and internal force, also can well simulate the internal water pressure tank shell 3D aqueduct structure, and can well reflect the three-dimensional effects of coupling. Therefore, this model can meet the requirements of aqueduct static calculation in engineering practice. The accuracy of setting reasonable number of two-dimensional solid flow the coupling piece can achieve good static simulation results.
(3) using a two-dimensional semi fluid solid coupling model is analyzed and calculated. Power of large aqueduct with simply supported U type aqueduct as the research object, based on the static analysis using a two-dimensional semi fluid solid coupling model is analyzed. The numerical model of two-dimensional semi solid coupling flow is proposed in this paper. Under the dynamic action that can simulate 3D aqueduct structure body and supporting the displacement and internal force variation, also can be used to simulate the change of water pressure of shell 3D aqueduct structure, and can better reflect the three-dimensional effects of coupling. Therefore, this model can meet the precision requirements of dynamic calculation of aqueduct engineering practice; moreover, the proposed two-dimensional semi fluid solid coupling model to maintain high computational efficiency, convenient for engineering use.
(4) the torsional effect of aqueduct earthquake on large-scale aqueduct is studied. Based on the two ends of the supporting stiffness is different, whether differences support conditions will result in the occurrence of adverse of torsion problem of aqueduct structure aqueduct. In different seismic excitations, the support stiffness difference of trough cross end torque degree in engineering analysis, the need to consider the difference characteristics of different seismic excitation loads. In aqueduct design, for simply supported beam aqueduct, used to control the condition of design of the aqueduct body can generally be used in force at the mid span section. During the earthquake, the cross section of the maximum stress. Control conditions to design the whole body can meet the seismic requirements in force at the mid span section.
(5) the level of large-scale aqueduct with bidirectional seismic response are studied. By three span large aqueduct support height as the research object, using finite element analysis software ADINA, using time history analysis method and fluid solid coupling finite element method to study the structure in the water levels orthogonal bidirectional earthquake the response of the two directional horizontal earthquake, deformation and vertical displacement of the aqueduct, the vertical bending moment and lateral vibration under the action of the individual difference, affected by the longitudinal earthquake. Compared to vertical or horizontal ground motion alone, at the level of bi-directional earthquake effect at the same time, the maximum principal body section the stress increases obviously, therefore, in the design of local body, should be the level of bidirectional earthquake into account.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TV672.3

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