【摘要】：高樁碼頭是軟土地基碼頭的主要結(jié)構(gòu)型式。水流不僅對(duì)高樁碼頭排架產(chǎn)生靜動(dòng)荷載作用,而且還可能產(chǎn)生結(jié)構(gòu)渦激振動(dòng)。研究水流荷載作用下高樁碼頭的穩(wěn)定性與水平承載力有重要意義。本文以高樁碼頭排架結(jié)構(gòu)為研究對(duì)象,采用理論分析與數(shù)值模擬相結(jié)合的方法,研究基樁和排架在水流作用下的工作性狀和承載特性；采用振動(dòng)理論,研究橫梁與樁的不同連接方式、樁與土的不同嵌固方式對(duì)碼頭基樁自振頻率的影響,分析渦激振動(dòng)對(duì)排架結(jié)構(gòu)的動(dòng)力效應(yīng)。(1)多向水流荷載作用下樁土工作性狀研究表明,雙彈簧法高估了土的水平抗力,不完全適合于分析多向受荷樁,推薦采用三維地基梁-彈簧模型。(2)排架結(jié)構(gòu)群樁效應(yīng)與五基樁模型的對(duì)比分析表明,橫梁對(duì)排架基樁的樁頂水平變位有約束作用,橫梁的約束降低了基樁的樁身變形程度,減小了基樁的泥面位移,減弱了基樁間的群樁效應(yīng)。(3)水流荷載作用下排架結(jié)構(gòu)承載力研究表明,橫梁對(duì)基樁樁頂?shù)募s束作用提高了排架結(jié)構(gòu)整體的抗彎剛度,增大了基樁的水平承載能力,排架結(jié)構(gòu)穩(wěn)定性遠(yuǎn)好于基樁結(jié)構(gòu)。(4)高樁碼頭基樁和排架結(jié)構(gòu)的振動(dòng)分析表明,樁底固定、樁頂自由時(shí)水中基樁的自振頻率為1.54Hz,橫梁與樁的不同連接方式、樁與土的不同嵌固方式不改變水中基樁的自振頻率。水流對(duì)基樁和排架的動(dòng)力效應(yīng)與漩渦周期和結(jié)構(gòu)自振頻率密切相關(guān),當(dāng)漩渦產(chǎn)生周期為1.9s時(shí),水流對(duì)基樁的動(dòng)力系數(shù)為1.13,動(dòng)力效應(yīng)較為明顯,對(duì)排架一階振型的動(dòng)力系數(shù)達(dá)到71.04,排架共振效應(yīng)明顯。
[Abstract]:High pile wharf is the main structure type of soft foundation wharf. The flow of water not only produces static and dynamic load on the bent frame of high pile wharf, but also may produce vortex-induced vibration. It is of great significance to study the stability and horizontal bearing capacity of high-pile wharf under the action of water flow. This paper takes the bent structure of high pile wharf as the research object, uses the method of theoretical analysis and numerical simulation to study the working behavior and bearing characteristics of foundation pile and bent frame under the action of water flow, and adopts the vibration theory, In this paper, the influence of different connecting modes of beam and pile on the natural vibration frequency of foundation pile of wharf is studied, and the dynamic effect of vortex-induced vibration on the structure of bent frame is analyzed. (1) the behavior of pile-soil under multi-direction flow load is studied. The double spring method overestimates the horizontal resistance of soil and is not fully suitable for the analysis of multi-direction loaded piles. Three-dimensional beam-spring model of foundation is recommended. (2) the comparison between pile group effect of bent frame structure and five-foundation pile model shows that, The horizontal displacement of the pile top of the bent pile is restrained by the beam. The constraint of the beam reduces the deformation degree of the pile body and the mud surface displacement of the foundation pile. (3) the research on the bearing capacity of bent structure under the action of water flow shows that the restraint action of beam on the top of pile increases the flexural stiffness of the whole bent structure and the horizontal bearing capacity of foundation pile. The stability of bent structure is much better than that of foundation pile structure. (4) the vibration analysis of foundation pile and bent structure of high pile wharf shows that when the pile bottom is fixed and the pile top is free, the natural vibration frequency of the foundation pile in water is 1.54 Hz. The natural vibration frequency of the foundation pile in water is not changed by the different fixing ways of pile and soil. The dynamic effect of water on pile and frame is closely related to the period of vortex and the natural frequency of structure. When the period of vortex is 1.9 s, the dynamic coefficient of flow to pile is 1.13, and the dynamic effect is obvious. The dynamic coefficient of the first order mode is 71.04, and the resonance effect is obvious.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U656.113

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