本文選題：鋼管樁 + 改進的JONSWAP譜��； 參考：《大連理工大學》2014年碩士論文

【摘要】：近五十年以來,鋼管樁漸漸成為基礎(chǔ)工程中的重要樁型。鋼管樁廣泛的應(yīng)用于深水碼頭、施工棧橋和海洋平臺。鋼管樁豎向和水平向承載力都比較大,常常作為高、大、重結(jié)構(gòu)以及受水平力作用的結(jié)構(gòu)的基礎(chǔ)樁。隨著海洋開發(fā)、海上采油工程事業(yè)的蓬勃發(fā)展,對鋼管樁動力響應(yīng)特性的研究越來越得到人們的重視。 在港口工程和海洋工程中,鋼管樁施工就位后就會受到波浪和水流荷載的作用,鋼管樁在波流荷載下的動力響應(yīng)對結(jié)構(gòu)安全有重要影響；尤其是在上部結(jié)構(gòu)沒有完成時,樁只能靠自身結(jié)構(gòu)承受這些荷載。在施工狀態(tài)下,鋼管樁處于單樁形態(tài),此時更偏于危險,因而分析此狀態(tài)下受波流荷載作用的鋼管樁的變形和應(yīng)力,就顯得更為重要。 本文首先基于有限元法,建立了計算結(jié)構(gòu)動力響應(yīng)的數(shù)值模型,采用八結(jié)點六面體劃分網(wǎng)格,結(jié)合改進平方根算法,通過求解以結(jié)點位移為未知量的結(jié)點平衡方程,得到結(jié)構(gòu)的結(jié)點位移和應(yīng)力。并且采用Newmark方法對結(jié)構(gòu)進行動力響應(yīng)分析,得到在外荷載作用下結(jié)構(gòu)的變形和應(yīng)力在時域內(nèi)的時程變化。然后,采用改進的JONSWAP譜模擬了不規(guī)則波浪譜,通過與靶譜吻合度的對比分析,得到了最佳模擬效果的模擬參數(shù)。進而根據(jù)Airy波理論求得了任意時刻水質(zhì)點的速度和加速度,從而通過莫里森公式計算了隨時間變化的波流荷載。最后采用此數(shù)值模型,對處于施工狀態(tài)的棧橋鋼管樁,進行了波流荷載作用下的動力響應(yīng)分析,得到了鋼管樁變形和內(nèi)力的時程變化,而且鋼管樁受到周期性沖擊。因而對時程變化曲線作了FFT變換,通過頻譜分析,得到了該周期性沖擊主要是由波浪荷載引起的共振所導致的。
[Abstract]:In the past 50 years, steel pipe pile has gradually become an important pile type in foundation engineering. Steel pipe piles are widely used in deep water wharf, construction trestle and offshore platform. The vertical and horizontal bearing capacity of steel pipe pile is relatively large, which is often used as foundation pile with high, large and heavy structure and structure subjected to horizontal force. With the development of marine exploitation and offshore oil recovery engineering, more and more attention has been paid to the dynamic response of steel pipe piles. In port engineering and offshore engineering, steel pipe piles will be subjected to wave and current loads when they are in place. The dynamic response of steel pipe piles under wave-current loads has an important impact on the safety of the structure, especially when the superstructure is not completed. The pile can only bear these loads by its own structure. Under the condition of construction, the steel pipe pile is in the form of a single pile, which is more dangerous. Therefore, it is more important to analyze the deformation and stress of the steel pipe pile under the action of wave and current load. In this paper, based on the finite element method, a numerical model is established to calculate the dynamic response of the structure. The eight-node hexahedron is used to mesh and the improved square root algorithm is used to solve the nodal equilibrium equation which takes the nodal displacement as the unknown quantity. The node displacement and stress of the structure are obtained. The Newmark method is used to analyze the dynamic response of the structure, and the time-history changes of the deformation and stress of the structure under the external load are obtained. Then, the irregular wave spectrum is simulated by using the improved JONSWAP spectrum, and the simulation parameters of the best simulation effect are obtained by comparing and analyzing the coincidence between the wave spectrum and the target spectrum. According to the Airy wave theory, the velocity and acceleration of water quality point at any time are obtained, and the wave and current loads varying with time are calculated by Morrison formula. Finally, the dynamic response of the steel pipe pile under wave-current load is analyzed by using this numerical model, and the time history variation of the deformation and internal force of the steel pipe pile is obtained, and the steel pipe pile is subjected to periodic impact. In this paper, the time-history curve is transformed by FFT transform, and the frequency spectrum analysis shows that the periodic shock is mainly caused by the resonance caused by wave load.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU473.1;TV139.26

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