本文選題：深水群樁基礎 + 靜、動力特性��； 參考：《合肥工業(yè)大學》2015年碩士論文

【摘要】：群樁基礎作為跨海橋梁下部結(jié)構,為分析其靜、動力響應,除考慮上部結(jié)構傳遞至群樁基礎的重力荷載、長期流水作用外,還應考慮群樁基礎處于海洋中受到的如波浪特殊動荷載。本文在查閱國內(nèi)外相關文獻后,依托實際跨海橋梁工程,取下部群樁基礎與承臺結(jié)構為研究對象,運用ANSYS Workbench軟件建立有限元模型,分析其在考慮流固耦合作用時的靜、動力響應特性,并得出以下結(jié)論：1、在進行群樁基礎的靜力分析時可知流速入口速度對群樁基礎的靜力特性的影響很大,兩者呈線性正比關系；隨著樁體的中心間距及樁體半徑的增大,群樁基礎最大應力及樁頂最大位移會減小,當樁徑長比設計值大于0.06時,群樁基礎安全隱患能降到最小；2、不論在靜水或是波流場作用下群樁基礎模態(tài)分析必須考慮流固耦合效應,在兩種作用下得到的前四階自振頻率和振型是不同的,當考慮波流共同作用時,流體對群樁基礎的阻尼增大,群樁基礎的前四階自振頻率要小于靜水中的自振頻率,當靜水水體的淹沒深度超過群樁基礎1/3時流固耦合效應開始加大；3、當分析改變波浪相關參數(shù)對群樁基礎的模態(tài)影響時,對群樁基礎前四階自振頻率影響最大的是波浪速度,影響最小的是波浪長度,波浪高度、長度和速度的改變對群樁基礎的第四階自振頻率影響最大,而波向角的改變對群樁基礎的第三階自振頻率影響最大；4、波浪高度的峰值時達到承臺高度時,群樁基礎的前四階自振頻率和振型改變將會趨向平緩,即在分析波浪高度對群樁基礎模態(tài)的影響時,波高的有效值即波浪的峰值達到承臺高度。
[Abstract]:In order to analyze the static and dynamic response of pile group foundation as the substructure of cross-sea bridge, in addition to considering the gravity load transferred from the superstructure to the pile group foundation, the effect of long-term flowing water is considered. Consideration should also be given to the special dynamic loads such as waves that the pile groups are subjected to in the ocean. After consulting the relevant literature at home and abroad, based on the actual cross-sea bridge engineering, taking the pile group foundation and cap structure as the research object, using ANSYS Workbench software to establish the finite element model, analyze its static when considering the fluid-solid coupling effect. The dynamic response characteristics and the following conclusions: 1. In the static analysis of pile group foundation, it is known that the velocity inlet velocity has a great influence on the static characteristics of pile group foundation, and the relationship between them is linear and positive. The maximum stress of pile group foundation and the maximum displacement of pile top will decrease with the increase of center spacing and radius of pile body. When the design value of diameter ratio of pile is greater than 0.06, the maximum stress of pile foundation and the maximum displacement of pile top will be decreased. The safety hidden danger of pile group foundation can be reduced to the minimum. No matter under the action of hydrostatic or wave-current field, the fluid-solid coupling effect must be taken into account in the modal analysis of pile group foundation, and the first four natural frequencies and modes obtained under the two kinds of action are different. When considering the interaction of wave and current, the damping of pile group foundation is increased, and the first four order natural vibration frequency of pile group foundation is smaller than that of static water. When the submerged depth of the hydrostatic water exceeds one third of the pile group foundation, the fluid-solid coupling effect begins to increase. When the modal effect of changing the wave related parameters on the pile group foundation is analyzed, the wave velocity is the most important factor affecting the first four natural frequencies of the pile group foundation. The change of wave length, wave height, length and velocity has the greatest influence on the fourth order natural vibration frequency of pile group foundation. The change of wave direction angle has the greatest influence on the third order natural vibration frequency of pile group foundation. When the peak wave height reaches the height of pile cap, the change of the first four order natural vibration frequency and vibration mode of pile group foundation will tend to be gentle. When analyzing the influence of wave height on the modal of pile group foundation, the effective value of wave height, i.e. the peak value of wave, reaches the height of pile cap.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U443.15

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