本文選題：組合體系 + 單索面斜拉體系��； 參考：《華南理工大學》2015年碩士論文

【摘要】：隨著橋梁技術的的不斷發(fā)展,大跨徑預應力混凝土連續(xù)剛構橋因其具備很多優(yōu)點:結構受力合理、跨越能力大、施工方便,得到了較為迅速的發(fā)展,但同時也存在很多的缺點:腹板易產生裂縫、開裂、跨中位置持續(xù)下撓,限制了其進一步的發(fā)展。本文針對大跨度連續(xù)剛構橋存在的病害問題,根據組合體系的受力特點提出了單索面塔梁組合斜拉體系加固的思路,并以佛山某大橋為工程背景,采用MIDAS/CIVIL有限元結構分析軟件建立全橋的有限元模型,做了如下的研究工作。(1)以佛山某大橋為工程背景,建立其新建橋梁結構的梁單元模型,并對模型進行試算修正,得到符合實際檢測結果的修正模型,即加固前連續(xù)剛構橋模型,并分別計算修正前后模型的應力值、撓度值、彎矩值等橋梁指標狀況;(2)對單索面塔梁組合斜拉體系的設計參數進行分析。通過建立符合規(guī)范要求的幾組不同塔高、不同中跨無索區(qū)長度、不同斜拉索布置形式的模型,在斜拉索索力相同的情況下,對比塔高、中跨無索區(qū)長度、斜拉索布置形式的變化對橋梁的應力、撓度、內力的影響大小,并確定了加固體系的設計參數的合理取值范圍;(3)結合斜拉橋和連續(xù)剛構橋的合理成橋狀態(tài),提出了加固體系的合理成橋狀態(tài),即通過調整斜拉索的索力使連續(xù)剛構橋的應力狀態(tài)達到最優(yōu),并約束其繼續(xù)下撓。據此,提出了組合加固體系的索力計算方法,結合影響矩陣法在MIDAS/CIVIL的具體應用 未知荷載系數法,確定合理成橋狀態(tài)的索力,運用差值法正迭代計算出符合精度要求的斜拉索初始張拉索力;(4)以佛山某大橋為工程背景,識別加固前大跨度連續(xù)剛構橋已存應力狀態(tài)、承載能力狀態(tài)、撓度值,并確定出單索面斜拉體系的設計參數,分析計算加固后單索面塔梁組合斜拉體系的橋梁狀況;(5)介紹了傳統的體外預應力加固方法及加固原理,并與單索面斜拉體系加固方法進行各項橋梁指標對比,并分析了兩種加固方法的加固效果。
[Abstract]:With the continuous development of bridge technology, long-span prestressed concrete continuous rigid frame bridge has been developed rapidly because of its many advantages: reasonable structural force, large span capacity, convenient construction. But at the same time, there are many disadvantages: the web is prone to crack, crack, continuous deflection in the middle of span, which limits its further development. Aiming at the problem of long span continuous rigid frame bridge, according to the stress characteristics of the composite system, this paper puts forward the idea of strengthening the single cable plane tower and beam composite cable-stayed system, and takes a bridge in Foshan as the engineering background. The finite element model of the whole bridge is established by using the MIDAS/CIVIL finite element structure analysis software. The following research work is done. Taking a bridge in Foshan as the engineering background, the beam element model of the new bridge structure is established, and the model is revised by trial calculation. The modified model, that is, the continuous rigid frame bridge model before reinforcement, is obtained, and the stress and deflection values of the model before and after the modification are calculated respectively. The design parameters of cable-stayed system with single cable plane tower and beam are analyzed. By establishing several groups of models of different tower height, different mid-span cable-free zone length and different cable-stayed arrangement form, in the case of the same cable force, the tower height and the mid-span no-cable zone length are compared. The influence of the cable layout on the stress, deflection and internal force of the bridge is determined, and the reasonable value range of the design parameters of the strengthened system is determined, which combines with the reasonable bridge state of the cable-stayed bridge and the continuous rigid frame bridge. In this paper, a reasonable bridge state of the reinforcement system is put forward, that is, the stress state of the continuous rigid frame bridge is optimized by adjusting the cable force of the stay cable, and the continuous deflection is restrained. Based on this, the calculation method of cable force of composite reinforcement system is put forward. Combined with the influence matrix method, the unknown load coefficient method is applied in MIDAS/CIVIL to determine the cable force in the reasonable state of the bridge. The difference method is used to calculate the initial cable tension in accordance with the precision requirement by using the difference method. Taking a bridge in Foshan as the engineering background, the existing stress state, bearing capacity state and deflection value of the long-span continuous rigid frame bridge before reinforcement are identified. The design parameters of the cable-stayed system with single cable plane are determined and the bridge condition of the composite cable-stayed system with single cable plane tower and beam after reinforcement is analyzed and calculated. (5) the traditional external prestressing strengthening method and the strengthening principle are introduced. Compared with the single cable plane cable-stayed system, the bridge indexes were compared, and the results of the two reinforcement methods were analyzed.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.23;U445.72

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本文編號：1797134