本文選題：橋塔 + 自立狀態(tài)�。� 參考：《長安大學》2017年碩士論文

【摘要】：隨著我國橋梁建設水平和建設質(zhì)量的提升,橋梁的跨越能力也越來越強,橋塔的高度也越來越高,橋塔的剛度也隨之減小,因此,大跨徑斜拉橋和懸索橋橋塔的抗風性能和美學性能是當前值得研究的重要課題之一。在現(xiàn)代大跨徑橋梁的建設過程中,橋塔沒有索和梁體系的約束,很長時間處于自立狀態(tài)。在此期間,與橋梁完全建成時相比,橋塔對風荷載更為敏感,因此,自立狀態(tài)下橋塔風致振動問題是影響設計方案和橋塔選型的關鍵因素之一。低阻尼的鋼橋塔易受橫風向的作用,而對于高度很高的混凝土橋塔同樣存在這一問題�；炷翗蛩䲠�(shù)量上遠遠超過鋼橋塔,它的開裂甚至破壞更是不可逆的,造成的結(jié)果更為嚴重。同時對施工過程中的現(xiàn)場施工員和施工機具的作業(yè)安全性也有很大的影響。本文通過雙柱式橋塔的風洞試驗,對比FLUENT模擬結(jié)果,分別得到迎風側(cè)單柱、背風側(cè)單柱和單柱的三分力系數(shù),根據(jù)結(jié)果選定要研究的風向角,在單一變量塔柱間凈距比變化的過程中,研究塔柱間氣動干擾效應對橋塔靜三分力系數(shù)的影響,為橋塔設計提供數(shù)據(jù)支持;使用ANSYS通用有限元計算軟件對橋塔進行了動力特性分析,在風洞實驗室制作了試驗模型,模擬風場進行了橋塔氣彈模型風洞試驗,研究了風荷載作用下橋塔的動力響應,并收集其他橋塔風洞試驗資料,考慮風荷載對橋塔選型的影響。此外,本文針對橋塔的風致振動控制措施進行了研究,介紹TLD設計流程并通過試驗證明,自立狀態(tài)下施加調(diào)液阻尼器經(jīng)濟方便,快捷有效,可以為以后同類橋塔TLD設計積累經(jīng)驗。本文的主要結(jié)論:1)通過風洞試驗發(fā)現(xiàn),雙柱式橋塔由于氣動干擾效應的存在會影響其靜三分力系數(shù),在Fluent數(shù)值模擬結(jié)果中同樣得到驗證,歸納出規(guī)律。2)改變塔柱間凈距與塔柱寬度的比值,進一步探究塔柱間氣動干擾的規(guī)律,得到雙柱式橋塔之間凈距應滿足5~6倍或者10倍以上塔柱寬度的設計區(qū)間,通過氣彈模型風洞試驗反面論證結(jié)論。3)針對前文設計區(qū)間之外而出現(xiàn)渦振的橋塔氣彈模型,提出采用TLD這種減振措施,并通過風洞試驗驗證其可行性。
[Abstract]:With the improvement of bridge construction level and construction quality in our country, the span ability of bridge is becoming stronger and stronger, the height of bridge tower is higher and higher, and the stiffness of bridge tower is also decreasing. The wind resistance and aesthetic performance of long span cable-stayed bridge and suspension bridge tower are one of the important topics worth studying at present. In the process of modern long span bridge construction, the tower has no constraints of cable and beam system, so it is in a state of independence for a long time. During this period, the tower is more sensitive to wind load than when the bridge is completed. Therefore, the wind-induced vibration of the tower under self-supporting condition is one of the key factors affecting the design scheme and the selection of the bridge tower. The steel bridge tower with low damping is easy to be affected by cross wind direction, but this problem also exists for the high height concrete bridge tower. The number of concrete tower is far larger than that of steel bridge tower, and its cracking and even destruction are irreversible, and the result is more serious. At the same time, it also has a great influence on the safety of construction workers and construction tools. Through wind tunnel test of two-column bridge tower and comparing with FLUENT simulation results, the three-point force coefficients of upwind side single column, leeward side single column and single column are obtained, and the wind direction angle to be studied is selected according to the results. In the process of the change of net distance ratio between single variable tower columns, the influence of aerodynamic interference effect on the static three-point force coefficient of bridge tower is studied to provide data support for tower design. The dynamic characteristics of the bridge tower are analyzed by ANSYS finite element calculation software. The test model is made in the wind tunnel laboratory, and the wind tunnel test of the aero-elastic model of the bridge tower is carried out by simulating the wind field. The dynamic response of the tower under the wind load is studied. The wind tunnel test data of other towers are collected and the influence of wind load on tower selection is considered. In addition, in this paper, the wind-induced vibration control measures of bridge tower are studied, and the design flow of TLD is introduced. It is proved that the application of liquid damper in self-supporting state is economical, convenient and efficient. Can accumulate experience for similar tower TLD design in the future. The main conclusion of this paper is: (1) through wind tunnel test, it is found that the static three-point force coefficient of double-column bridge tower will be affected by the existence of aerodynamic interference effect, which is also verified by Fluent numerical simulation results. (2) changing the ratio of the net distance between the towers to the width of the column, and further exploring the laws of the aerodynamic interference between the towers, and obtaining the design interval of the net distance between the twin column bridges that should be 5 or 10 times the width of the tower column. In view of the aero-elastic model of bridge tower which appears vortex vibration outside the previous design section, this paper puts forward the method of adopting TLD to reduce the vibration, and proves its feasibility by wind tunnel test.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U446.1;U441.3

【相似文獻】

相關期刊論文 前8條

1 孫尚白;;TLD技術在城市智能軌道交通中的應用[J];智能建筑與城市信息;2013年05期

2 任智強,戴軍;TLD測量的質(zhì)量控制和測量技術[J];科技情報開發(fā)與經(jīng)濟;2003年05期

3 夏君定,王維達,梁寶鎏;表面TLD法測定瓷器的年劑量[J];核技術;2001年12期

4 李春祥;地震作用下高層建筑TLD控制優(yōu)化設計[J];建筑結(jié)構;2000年02期

5 梁啟智,熊俊明;圓柱形二層流體TLD的振動特性分析[J];工程力學;2001年01期

6 鄒向陽;王浩陽;高紅飛;周繼璋;;竹材雙層樓板摩擦減振與頂部TLD聯(lián)合減振體系的理論推導[J];長春工程學院學報(自然科學版);2011年04期

7 王永剛;鐵路斜拉橋車橋動力響應的TLD控制研究[J];中國鐵道科學;1999年03期

8 王日新,沈國光;兩層流體TLD搖動的解析解和數(shù)值模擬[J];水動力學研究與進展(A輯);2000年03期

相關碩士學位論文 前5條

1 閆冰;橋塔自立狀態(tài)風致振動試驗研究及TLD控制系統(tǒng)設計[D];長安大學;2017年

2 孟煜;基于TLD的多目標快速跟蹤算法研究[D];遼寧工程技術大學;2015年

3 梁宵;基于檢測區(qū)域自動調(diào)整的TLD目標跟蹤研究[D];吉林大學;2016年

4 周雅琪;結(jié)合濾波理論的內(nèi)河視頻序列船舶TLD跟蹤算法研究[D];武漢理工大學;2013年

5 張俊輝;基于TLD框架的手勢檢測與跟蹤系統(tǒng)的研究與實現(xiàn)[D];武漢理工大學;2013年

，

本文編號：1954026