發(fā)布時(shí)間：2018-06-16 10:10

  本文選題：雙槽式渡槽 + 流固耦合　； 參考：《蘭州交通大學(xué)》2014年碩士論文

【摘要】：我國水資源總量豐富但人均占有量不足且時(shí)空分布極不平衡，這導(dǎo)致我國部分地區(qū)嚴(yán)重缺水。為了解決我國水資源分布不均的現(xiàn)狀，，我國修建了一系列跨地區(qū)、跨流域、長距離的水資源調(diào)配工程。在這些大型輸水調(diào)水工程中，渡槽作為一種交叉聯(lián)系水工建筑物，得到了廣泛應(yīng)用。隨著輸水流量的不斷增大，傳統(tǒng)的單槽式渡槽已不能滿足實(shí)際工程的需要，作為一種新型的渡槽結(jié)構(gòu)型式，多槽式渡槽在南水北調(diào)工程中被廣泛應(yīng)用。典型的雙槽并聯(lián)渡槽有雙洎河渡槽和m:河渡槽，三槽并聯(lián)渡槽有漕河渡槽。由于槽墩之上的槽體與槽體內(nèi)水體荷載特別巨大，這些渡槽是典型的“頭重腳輕”結(jié)構(gòu)，在地震作用下，這些結(jié)構(gòu)型式極不利于抗震。 在地震作用下，渡槽會發(fā)生劇烈振動(dòng)，槽殼中的水體也會相應(yīng)的產(chǎn)生一定晃動(dòng)，水體的晃動(dòng)作用越是劇烈，水體與渡槽結(jié)構(gòu)的耦合效果越強(qiáng)，這是一種復(fù)雜的流體與結(jié)構(gòu)的相互作用問題。但是目前的水工抗震規(guī)范卻沒有提及有關(guān)渡槽流固耦合的設(shè)計(jì)方法及原則，因此有必要將流固耦合的研究理論與渡槽相結(jié)合，研究大型渡槽結(jié)構(gòu)在地震作用下的動(dòng)力反應(yīng)。 本文以南水北調(diào)工程雙洎河雙槽式渡槽為例，用大型有限元軟件ANSYS建立了考慮水體作用的三維動(dòng)力分析模型，計(jì)算了該渡槽在不同水體作用下的自振特性。計(jì)算結(jié)果表明：渡槽的自振頻率隨著槽內(nèi)水體質(zhì)量的增加而降低，水體增加的越多，頻率下降的越多，水體的存在延長了結(jié)構(gòu)的自振周期；槽內(nèi)是否有水，對雙洎河渡槽的主振型影響不大。 采用時(shí)程分析法從動(dòng)位移和動(dòng)應(yīng)力兩方面計(jì)算了渡槽在不同地震波作用下的動(dòng)力響應(yīng)。計(jì)算結(jié)果表明：在不同地震波激勵(lì)下，渡槽結(jié)構(gòu)的橫向位移和應(yīng)力都隨著槽內(nèi)水位的增加而增大，這是由于槽殼內(nèi)水體的質(zhì)量增加了上部結(jié)構(gòu)的重量，使作用在結(jié)構(gòu)上的地震力加大的緣故；在大型渡槽的動(dòng)力分析中，必須考慮槽內(nèi)水體質(zhì)量的影響，建立合理的動(dòng)力分析模型。
[Abstract]:The total amount of water resources in China is abundant, but the per capita water resources are insufficient and the spatial and temporal distribution is very unbalanced, which leads to serious water shortage in some areas of China. In order to solve the problem of uneven distribution of water resources in China, a series of water resources allocation projects across regions, across basins and over long distances have been built. In these large-scale water transfer projects, aqueduct is widely used as a kind of intersecting hydraulic structure. As a new type of aqueduct, multi-channel aqueduct is widely used in South-to-North Water transfer Project. The typical parallel aqueduct has double Ji River aqueduct and m: River aqueduct, while the three parallel aqueduct has Caohe Aqueduct. These aqueducts are typical "top-heavy" structures because of the huge loads on the trough body and the water body above the trough pier. Under the earthquake action, these structural types are extremely unfavorable to the earthquake resistance. Under the earthquake action, the aqueduct will vibrate violently, and the water body in the tank shell will also produce certain sloshing. The more intense the sloshing action, the stronger the coupling effect between the water body and the aqueduct structure. This is a complex interaction between fluid and structure. However, the design methods and principles of fluid-solid coupling of aqueduct are not mentioned in the current seismic code, so it is necessary to combine the research theory of fluid-solid coupling with the aqueduct to study the dynamic response of large aqueduct structures under earthquake. Taking the Shuangji River double-channel aqueduct of the South-to-North Water transfer Project as an example, a three-dimensional dynamic analysis model considering the effect of water body is established by using the large-scale finite element software ANSYS, and the natural vibration characteristics of the aqueduct under different water bodies are calculated. The results show that the natural vibration frequency of the aqueduct decreases with the increase of the water quality in the aqueduct, the more the water body increases, the more the frequency decreases, and the existence of the water body prolongs the natural vibration period of the structure, and whether there is water in the aqueduct, It has little effect on the main mode of Shuangji River aqueduct. The dynamic response of aqueduct under different seismic waves was calculated by time-history analysis from two aspects of dynamic displacement and dynamic stress. The results show that the transverse displacement and stress of aqueduct structure increase with the increase of water level in the aqueduct under the excitation of different seismic waves, which is due to the increase of the weight of the superstructure by the mass of the water body in the tank shell. In the dynamic analysis of large aqueduct, the influence of water quality in the aqueduct must be considered, and a reasonable dynamic analysis model must be established.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV672.3;TV312

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