本文選題：波浪荷載 + 群樁效應(yīng)　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：我國幅員遼闊,擁有近300萬平方公里的海域與1.8萬公里長的大陸海岸線。近年來,我國開始大力開發(fā)包括大陸海岸線及近海范圍內(nèi)的海洋資源,因此在近海范圍內(nèi)建造了大量的海上結(jié)構(gòu)物。海上結(jié)構(gòu)物中,特別是對(duì)近海岸跨海大橋而言,通常在實(shí)際工程中把結(jié)構(gòu)所受波浪荷載當(dāng)作設(shè)計(jì)中的控制荷載,它對(duì)工程的成本、正常使用壽命及安全性都起著決定性的作用。以往的文獻(xiàn)大多僅針對(duì)樁柱結(jié)構(gòu)的水動(dòng)力特性進(jìn)行分析,而對(duì)于跨海大橋來說,更多考慮的是群樁—承臺(tái)結(jié)構(gòu)受到波浪力荷載作用的情況,因而有必要對(duì)群樁—承臺(tái)結(jié)構(gòu)在波浪作用下的水動(dòng)力特性進(jìn)行系統(tǒng)研究。本文的主要內(nèi)容如下:(1)論述了對(duì)群樁—承臺(tái)結(jié)構(gòu)的水動(dòng)力特性進(jìn)行分析的目的及意義,介紹了國內(nèi)外對(duì)波浪數(shù)值模擬的研究現(xiàn)狀及進(jìn)展,并歸納總結(jié)了波浪與結(jié)構(gòu)物相互作用的數(shù)值模擬方法。(2)探討并對(duì)運(yùn)用數(shù)值模擬方法分析群樁—承臺(tái)結(jié)構(gòu)的水動(dòng)力特性的可靠性及準(zhǔn)確性進(jìn)行分析,分析證明本文數(shù)值分析的結(jié)果是可行、可靠的。(3)通過建立縮尺群樁—承臺(tái)結(jié)構(gòu)三維數(shù)值波浪水槽,研究了承臺(tái)結(jié)構(gòu)對(duì)樁柱群樁效應(yīng)的影響,繪出了群樁—承臺(tái)結(jié)構(gòu)群樁效應(yīng)系數(shù)KG隨KC數(shù)變化曲線。并通過改變樁柱排列方式、相對(duì)樁距、承臺(tái)結(jié)構(gòu)尺寸及承臺(tái)淹沒系數(shù)以研究以上參數(shù)對(duì)群樁—承臺(tái)結(jié)構(gòu)的水動(dòng)力特性的影響。(4)結(jié)合實(shí)際工程案例對(duì)縮尺群樁—承臺(tái)結(jié)構(gòu)群樁效應(yīng)系數(shù)KG曲線運(yùn)用于實(shí)際全尺工程結(jié)構(gòu)上的可行性進(jìn)行了驗(yàn)證,通過一致性指數(shù)及相關(guān)系數(shù)等指標(biāo)說明使用縮尺群樁—承臺(tái)結(jié)構(gòu)的群樁效應(yīng)系數(shù)KG可用于實(shí)際工程,并對(duì)計(jì)算樁柱波浪力有一定的參考意義。
[Abstract]:China has a vast territory, with nearly 3 million square kilometers of sea area and 18000 kilometers of continental coastline. In recent years, China began to vigorously develop marine resources, including the continental coastline and offshore areas, so a large number of offshore structures have been built in the offshore area. In the offshore structure, especially for the offshore bridge, the wave load of the structure is usually regarded as the control load in the design, which plays a decisive role in the cost, normal service life and safety of the project. Most of the previous literatures only analyzed the hydrodynamic characteristics of pile-column structures, but for cross-sea bridges, more consideration was given to the case that pile-cap structures were subjected to wave loads. Therefore, it is necessary to study the hydrodynamic characteristics of pile-cap structure under wave action. The main contents of this paper are as follows: (1) the purpose and significance of analyzing the hydrodynamic characteristics of pile-cap structure are discussed, and the present situation and progress of numerical simulation of wave at home and abroad are introduced. The numerical simulation method of the interaction between wave and structure is summarized and the reliability and accuracy of the numerical simulation method to analyze the hydrodynamic characteristics of pile-cap structure are analyzed. It is proved that the results of numerical analysis in this paper are feasible and reliable. The effect of cap structure on pile-pile group effect is studied by establishing a three-dimensional numerical wave tank for pile group pile-cap structure. The change curve of pile group effect coefficient KG with KC number of pile-cap structure is plotted. And by changing the arrangement of pile columns, relative pile spacing, The influence of the above parameters on the hydrodynamic characteristics of pile-cap structure is studied. (4) combined with practical engineering cases, the effect coefficient KG curve of pile group pile-cap structure is applied to practice. The feasibility of full-scale engineering structure is verified. Through the index of consistency index and correlation coefficient, it is shown that the effect coefficient KG of pile group pile cap structure can be used in practical engineering, and it has some reference significance for calculating wave force of pile column.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U443.15

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本文編號(hào)：1778303