本文選題：景觀橋 + 抗風(fēng)性能　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟快速發(fā)展、橋梁設(shè)計水平的提高,設(shè)計師們越來越關(guān)注橋梁結(jié)構(gòu)的美學(xué)特性,近年來旅游業(yè)的快速發(fā)展推動了風(fēng)景區(qū)內(nèi)玻璃景觀橋梁的建造。此類景觀橋不僅造型獨特結(jié)構(gòu)新穎,而且多建于風(fēng)速很大的懸崖邊、峽谷上,風(fēng)作用明顯,但相關(guān)的研究較少。本文以某玻璃景觀橋為工程背景,采用風(fēng)洞試驗與有限元計算相結(jié)合的方式,對玻璃景觀橋的風(fēng)致振動舒適度以及風(fēng)荷載特性進(jìn)行研究,本文主要工作及結(jié)論如下:1.分析了某玻璃景觀橋的結(jié)構(gòu)動力特性,為擬彈性模型風(fēng)洞試驗提供了必要的參數(shù),計算結(jié)果表明該橋振動基頻較高。2.對玻璃景觀橋進(jìn)行了剛性模型和擬彈性模型試驗,得到了不同風(fēng)攻角和風(fēng)向角工況下結(jié)構(gòu)的風(fēng)荷載特征、渦激振動性質(zhì)以及抖振響應(yīng),試驗風(fēng)速內(nèi),場地模型對整個測力模型的風(fēng)場影響較為明顯,測力試驗的靜力五分力系數(shù)變化較大,當(dāng)山體處于橋體背風(fēng)側(cè)的幾個風(fēng)偏角時,考慮到風(fēng)洞地面與山體引起流場及渦旋的變化,導(dǎo)致升力系數(shù)數(shù)值在該風(fēng)偏角范圍內(nèi)較大。沒有觀察到渦激共振的產(chǎn)生。3.對常用的振動舒適度評價方法、各國規(guī)范中關(guān)于振動舒適度的規(guī)定進(jìn)行了介紹與比較,并基于風(fēng)洞試驗結(jié)果對某玻璃景觀橋進(jìn)行了舒適度評價,比較中發(fā)現(xiàn),僅IOS規(guī)范中對不同頻率對振動舒適度的影響有所考慮,且很多規(guī)范未對人體更為敏感的橫向振動進(jìn)行考慮。4.基于風(fēng)洞試驗結(jié)果,利用有限元計算,結(jié)合結(jié)構(gòu)自身受力特性,對風(fēng)荷載作用下結(jié)構(gòu)危險截面進(jìn)行強度驗算,將平均風(fēng)產(chǎn)生的截面應(yīng)力與振動部分作了對比,結(jié)果表明此類橋的風(fēng)荷載主要來源于靜力效應(yīng),動力效應(yīng)的貢獻(xiàn)很小。
[Abstract]:With the rapid development of economy and the improvement of bridge design level, designers have paid more and more attention to the aesthetic characteristics of bridge structure. In recent years, the rapid development of tourism industry has promoted the construction of glass Landscape Bridges in the scenic area. This kind of landscape bridge is not only unique in its unique structure, but also on the cliff edge of high wind speed, and the wind effect is clear in the canyon. In this paper, taking a glass landscape bridge as the engineering background, the wind tunnel test and finite element method are used to study the wind-induced vibration comfort and wind load characteristics of the glass landscape bridge. The main work and conclusion are as follows: 1. the structural dynamic characteristics of a glass landscape bridge are analyzed, which is a quasi projectile. The wind tunnel test of sexual model provides the necessary parameters. The calculation results show that the rigid model and pseudo elastic model test of the bridge with high vibration base frequency.2. are carried out on the glass landscape bridge. The wind load characteristics, the characteristics of vortex induced vibration and the buffeting response are obtained under the different wind attack angle and the wind direction angle, and the field model is the whole in the test wind speed. The influence of the wind field of the dynamometer model is more obvious, and the static five force coefficient of the force test varies greatly. When the mountain is in the wind deflection angle of the leeward side of the bridge body, considering the change of the flow field and the vortex in the wind tunnel ground and the mountain body, the lift coefficient value is larger in the range of the wind deflection angle. There is no observation of the generation of.3. pair of the vortex excited resonance. The commonly used evaluation method of vibration comfort degree is introduced and compared in various countries, and the comfort degree of a glass landscape bridge is evaluated based on the wind tunnel test results. It is found that the influence of different frequencies on the vibration comfort is considered only in the IOS specification, and many specifications are not more for the human body. On the basis of the wind tunnel test results, the sensitive lateral vibration is based on the wind tunnel test. Using the finite element calculation and combining the mechanical behavior of the structure, the strength of the structural dangerous section under the wind load is calculated. The cross section stress produced by the average wind is compared with the vibration part. The results show that the wind load of this kind of bridge is mainly derived from the static effect and the dynamic force. The contribution of the force effect is very small.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

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本文編號：2006559