本文選題：海上風(fēng)機(jī)基礎(chǔ)結(jié)構(gòu) + 簡(jiǎn)單平面管節(jié)點(diǎn)�。� 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：風(fēng)能是一種既清潔又安全的可再生綠色能源。我國(guó)海上有著豐富的風(fēng)能資源,目前海上風(fēng)能的大規(guī)模開(kāi)發(fā)還存在著諸多挑戰(zhàn)。我國(guó)海上風(fēng)機(jī)多推薦采用多樁基礎(chǔ)結(jié)構(gòu)型式,海上風(fēng)機(jī)基礎(chǔ)結(jié)構(gòu)不僅受到波流荷載的作用,更受到頂部風(fēng)機(jī)空氣動(dòng)力荷載的長(zhǎng)期作用,從而導(dǎo)致結(jié)構(gòu)發(fā)生疲勞損傷。結(jié)構(gòu)的疲勞破壞往往從節(jié)點(diǎn)開(kāi)始,管節(jié)點(diǎn)的疲勞損傷是引起結(jié)構(gòu)整體失效破壞的最薄弱環(huán)節(jié)。 本文針對(duì)海上風(fēng)機(jī)的多樁基礎(chǔ)結(jié)構(gòu),確定了管節(jié)點(diǎn)的類型。利用有限元分析軟件ANSYS,開(kāi)展了管節(jié)點(diǎn)應(yīng)力集中系數(shù)SCF的研究。完成的主要工作包括： (1)基于空間幾何理論,針對(duì)弦桿和撐桿,分別推導(dǎo)得到焊趾和焊跟的空間曲線方程。并利用MATLAB,編寫(xiě)了計(jì)算程序。 (2)分別利用殼單元和實(shí)體單元對(duì)一簡(jiǎn)單K型管節(jié)點(diǎn)建立有限元模型,計(jì)算得到該管節(jié)點(diǎn)沿焊縫周向的應(yīng)力集中因子。數(shù)值計(jì)算結(jié)果與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,確定采用實(shí)體單元進(jìn)行管節(jié)點(diǎn)熱點(diǎn)應(yīng)力的研究。 (3)針對(duì)實(shí)際三樁和五樁海上風(fēng)機(jī)基礎(chǔ)結(jié)構(gòu),開(kāi)展疲勞工況下荷載組合分析,確定平面K/Y型管節(jié)點(diǎn)和多平面Y型管節(jié)點(diǎn)分別在軸力、面內(nèi)彎矩和面外彎矩作用下的多種加載方式。 (4)根據(jù)海上風(fēng)機(jī)實(shí)際結(jié)構(gòu)的幾何參數(shù),確定平面管節(jié)點(diǎn)的計(jì)算工況,采用實(shí)體單元,建立平面K/Y型管節(jié)點(diǎn)有限元模型,開(kāi)展不同加載方式下的數(shù)值計(jì)算,得到SCF沿弦桿和撐桿焊縫的分布。探討了管節(jié)點(diǎn)幾何參數(shù)α、βA、βB、θA、θB對(duì)SCF的影響。并將SCF的數(shù)值計(jì)算結(jié)果與DNV-RP-C203規(guī)范的計(jì)算結(jié)果進(jìn)行了對(duì)比。 (5)根據(jù)海上風(fēng)機(jī)實(shí)際結(jié)構(gòu)的幾何參數(shù),分布確定三平面和五平面Y型管節(jié)點(diǎn)的計(jì)算工況,采用實(shí)體單元,建立多平面Y型管節(jié)點(diǎn)有限元模型,開(kāi)展不同加載方式下的數(shù)值計(jì)算,得到SCF沿弦桿和撐桿焊縫的分布。探討了多平面Y型管節(jié)點(diǎn)幾何參數(shù)α、β、γ、τ對(duì)SCF的影響。并將SCF的數(shù)值計(jì)算結(jié)果與DNV-RP-C203規(guī)范中平面Y型管節(jié)點(diǎn)的計(jì)算結(jié)果進(jìn)行了對(duì)比。
[Abstract]:Wind energy is a clean and safe renewable green energy. There are abundant wind energy resources on the sea in China, and there are still many challenges in large-scale development of offshore wind energy. Multi-pile foundation structure is recommended for offshore fan in our country. The foundation structure of offshore fan is not only affected by wave and current load, but also by aerodynamic load on top fan for a long time, resulting in fatigue damage of the structure. The fatigue failure of the structure usually begins with the joint, and the fatigue damage of the tubular joint is the weakest link that causes the failure of the whole structure. According to the multi-pile foundation structure of offshore fan, the type of pipe joint is determined in this paper. The stress concentration factor (SCF) of pipe joints is studied by finite element analysis software ANSYS. The main works are as follows: 1) based on the theory of spatial geometry, the space curve equations of weld toe and heel are derived for chord and brace respectively. The finite element model of a simple K type pipe joint is established by shell element and solid element respectively, and the stress concentration factor of the pipe joint along the circumferential direction of the weld is calculated. Comparing the numerical results with the experimental results, it is determined that the solid element is used to study the hot spot stress of the pipe joints. (3) for the actual three piles and five piles of offshore fan foundation structure, the load combination analysis under fatigue condition is carried out. The loading modes of plane K / Y pipe joints and multi-plane Y joints under axial force, in-plane bending moment and out-of-plane bending moment are determined respectively. (4) according to the geometric parameters of the actual structure of the offshore fan, The finite element model of plane K / Y joint is established by using solid element, and the distribution of SCF along chord and brace weld is obtained by numerical calculation under different loading modes. The effects of geometric parameters 偽, 尾 A, 尾 B, 胃 A, 胃 B on SCF are discussed. The numerical results of SCF are compared with those of DNV-RP-C203 code. The finite element model of multi-plane Y-shaped pipe joints is established, and the distribution of SCF along chord and braced weld is obtained by numerical calculation under different loading modes. The effects of geometric parameters 偽, 尾, 緯, 蟿 on SCF are discussed. The numerical results of SCF are compared with those of planar Y-shaped pipe joints in DNV-RP-C203 specification.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM614;U674.38

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本文編號(hào)：2022112