本文選題：三塔連跨懸索橋　切入點(diǎn)：平穩(wěn)風(fēng)特性　出處：《東南大學(xué)》2015年碩士論文

【摘要】：三塔連跨懸索橋是在兩塔懸索橋的基礎(chǔ)上發(fā)展起來(lái)的一種新橋型,中塔的引入使得其動(dòng)靜力特性較之兩塔懸索橋更加復(fù)雜。隨著橋梁跨度的增加,強(qiáng)風(fēng)作用下大跨度三塔連跨懸索橋的風(fēng)致抖振問(wèn)題日益顯著,其風(fēng)致抖振精細(xì)化與振動(dòng)控制研究備受關(guān)注。本文以泰州大橋?yàn)楣こ瘫尘?緊緊圍繞三塔連跨懸泰橋風(fēng)致抖振和MTMD減振控制兩大研究熱點(diǎn),結(jié)合泰州大橋橋址區(qū)實(shí)測(cè)風(fēng)數(shù)據(jù)和大型有限元分析軟件ANSYS,開(kāi)展大跨度三塔連跨懸索橋風(fēng)致抖振及其MTMD控制研究。主要研究?jī)?nèi)容包括：1.泰州大橋有限元建模及其動(dòng)力特性分析。根據(jù)泰州大橋結(jié)構(gòu)設(shè)計(jì)參數(shù)在ANSYS中建立了結(jié)構(gòu)三維有限元模型,從而采用子空間迭代法計(jì)算了泰州大橋的模態(tài)參數(shù)。根據(jù)泰州大橋成橋試驗(yàn)及模型試驗(yàn)數(shù)據(jù),將實(shí)測(cè)模態(tài)參數(shù)與計(jì)算模態(tài)參數(shù)進(jìn)行了對(duì)比,以驗(yàn)證所建立的泰州大橋有限元模型的準(zhǔn)確性。2.泰州大橋橋址區(qū)強(qiáng)臺(tái)風(fēng)平穩(wěn)與非平穩(wěn)特性現(xiàn)場(chǎng)實(shí)測(cè)研究。以臺(tái)風(fēng)“娜基莉”為研究背景,根據(jù)泰州大橋橋址區(qū)實(shí)測(cè)風(fēng)數(shù)據(jù)開(kāi)展了實(shí)測(cè)強(qiáng)風(fēng)平穩(wěn)與非平穩(wěn)特性對(duì)比研究。通過(guò)游程檢驗(yàn)法對(duì)風(fēng)速時(shí)程的均值與方差進(jìn)行了非平穩(wěn)性檢驗(yàn),從而定量評(píng)估了基本時(shí)距內(nèi)風(fēng)速的非平穩(wěn)比例�；谄椒�(wěn)與非平穩(wěn)風(fēng)速模型分析了臺(tái)風(fēng)的平均風(fēng)特性、紊流強(qiáng)度、陣風(fēng)因子、紊流積分尺度和紊流功率譜密度等具體風(fēng)特性參數(shù)。3.基于插值函數(shù)的三塔連跨懸索橋簡(jiǎn)化三維脈動(dòng)風(fēng)場(chǎng)模擬。傳統(tǒng)諧波合成法在模擬脈動(dòng)風(fēng)速時(shí)需進(jìn)行大量的Cholesky分解,其直接制約了算法的計(jì)算效率。本文通過(guò)對(duì)Cholesky分解矩陣引入插值近似以減少Cholesky分解的次數(shù),從而大幅度提高了傳統(tǒng)諧波合成法的計(jì)算效率。采用簡(jiǎn)化風(fēng)場(chǎng)模擬方法,在保證足夠模擬精度的前提下,實(shí)現(xiàn)了三塔連跨懸索橋三維脈動(dòng)風(fēng)場(chǎng)的快速有效模擬。4.基于平穩(wěn)與非平穩(wěn)風(fēng)譜的三塔連跨懸索橋抖振性能對(duì)比研究。鑒于平穩(wěn)與非平穩(wěn)風(fēng)速模型的差異,根據(jù)Davenport準(zhǔn)定常理論分別推導(dǎo)了平穩(wěn)與非平穩(wěn)靜風(fēng)荷載、抖振力和自激力模型�；谒M的橋址區(qū)平穩(wěn)與非平穩(wěn)三維脈動(dòng)風(fēng)場(chǎng),結(jié)合泰州大橋三維有限元模型,從而開(kāi)展了三塔連跨懸索橋平穩(wěn)與非平穩(wěn)抖振性能對(duì)比研究。5.大跨度三塔連跨懸索橋風(fēng)致抖振MTMD控制研究。根據(jù)三塔連跨懸索橋抖振響應(yīng)特征確立了MTMD的設(shè)計(jì)方案,采用輪次更新法研究了MTMD設(shè)計(jì)參數(shù)(TMD數(shù)量、質(zhì)量比、阻尼比、頻帶寬等)對(duì)減振效果的參數(shù)敏感性,結(jié)合MTMD的減振效果與魯棒性等兩個(gè)因素確定了MTMD設(shè)計(jì)參數(shù)的優(yōu)選值,從而進(jìn)一步開(kāi)展了減振前后大跨度三塔連跨懸索橋風(fēng)致抖振對(duì)比分析。
[Abstract]:Three-tower multi-span suspension bridge is a new type of bridge developed on the basis of two-tower suspension bridge. The introduction of middle tower makes its dynamic and dynamic characteristics more complex than that of two-tower suspension bridge.With the increase of bridge span, the wind-induced buffeting problem of long-span three-tower continuous span suspension bridge is becoming more and more obvious under the action of strong wind, and the study of wind-induced buffeting refinement and vibration control has attracted much attention.Taking Taizhou Bridge as the engineering background, this paper focuses on the wind-induced buffeting and MTMD damping control of the three-tower multi-span suspension Thai bridge.The wind-induced buffeting and its MTMD control of a long-span three-tower continuous span suspension bridge are studied based on the measured wind data in Taizhou Bridge site and the large-scale finite element analysis software ANSYS.The main research contents include: 1.Finite element Modeling and dynamic characteristic Analysis of Taizhou Bridge.According to the structural design parameters of Taizhou Bridge, a three-dimensional finite element model of the structure is established in ANSYS, and the modal parameters of Taizhou Bridge are calculated by subspace iteration method.According to the test data of Taizhou Bridge and model test, the measured modal parameters and calculated modal parameters are compared to verify the accuracy of the established finite element model of Taizhou Bridge.Field observation study on stationary and non-stationary characteristics of strong Typhoon in Taizhou Bridge site.Based on the wind data of Taizhou Bridge site, a comparative study was carried out on the stationary and non-stationary characteristics of the strong wind measured in Taizhou Bridge based on the background of Typhoon Najili.The mean and variance of wind speed time history are tested by run test method, and the non-stationary ratio of wind speed in basic time distance is evaluated quantitatively.Based on the stationary and non-stationary wind speed model, the wind characteristic parameters of typhoon, such as mean wind characteristics, turbulence intensity, gust factor, turbulence integral scale and turbulent power spectral density, are analyzed.Simplified three-dimensional pulsating wind field simulation of three-tower continuous span suspension bridge based on interpolation function.The traditional harmonic synthesis method needs a lot of Cholesky decomposition to simulate the fluctuating wind speed, which directly restricts the computational efficiency of the algorithm.In this paper, interpolation approximation is introduced to the Cholesky factorization matrix to reduce the number of Cholesky factorization, which greatly improves the computational efficiency of the traditional harmonic synthesis method.The simplified wind field simulation method is used to simulate the three dimensional pulsating wind field of a three-tower continuous span suspension bridge under the premise of sufficient simulation accuracy.A comparative study of buffeting performance of a three-tower continuous span suspension bridge based on stationary and non-stationary wind spectrum is presented.In view of the difference between stationary and non-stationary wind speed models, the stationary and non-stationary static wind load, buffeting force and self-excitation force models are derived according to Davenport's quasi-steady theory.Based on the simulated steady and non-stationary three dimensional pulsating wind field of the bridge site and combined with the three-dimensional finite element model of Taizhou Bridge, a comparative study on the stationary and non-stationary buffeting performance of the three-tower and multi-span suspension bridge is carried out.MTMD control of wind induced buffeting of long span three-tower continuous span suspension bridge.According to the buffeting response characteristics of three-tower continuous span suspension bridge, the design scheme of MTMD is established. The parameter sensitivity of MTMD design parameters such as quantity, mass ratio, damping ratio, frequency bandwidth, etc.Combined with the effect of MTMD and robustness, the optimal design parameters of MTMD are determined, and the comparison analysis of wind-induced buffeting of long-span three-tower continuous span suspension bridge before and after vibration reduction is carried out.
【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】：2015
【分類(lèi)號(hào)】：U441.3;U448.25
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本文編號(hào)：1712206