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

【摘要】：隨著橋梁技術(shù)的的不斷發(fā)展,大跨徑預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋因其具備很多優(yōu)點(diǎn):結(jié)構(gòu)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(shí)也存在很多的缺點(diǎn):腹板易產(chǎn)生裂縫、開裂、跨中位置持續(xù)下?lián)?限制了其進(jìn)一步的發(fā)展。本文針對大跨度連續(xù)剛構(gòu)橋存在的病害問題,根據(jù)組合體系的受力特點(diǎn)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?yàn)楣こ瘫尘?采用MIDAS/CIVIL有限元結(jié)構(gòu)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?yàn)楣こ瘫尘?建立其新建橋梁結(jié)構(gòu)的梁單元模型,并對模型進(jìn)行試算修正,得到符合實(shí)際檢測結(jié)果的修正模型,即加固前連續(xù)剛構(gòu)橋模型,并分別計(jì)算修正前后模型的應(yīng)力值、撓度值、彎矩值等橋梁指標(biāo)狀況;(2)對單索面塔梁組合斜拉體系的設(shè)計(jì)參數(shù)進(jìn)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(yīng)力、撓度、內(nèi)力的影響大小,并確定了加固體系的設(shè)計(jì)參數(shù)的合理取值范圍;(3)結(jié)合斜拉橋和連續(xù)剛構(gòu)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(diào)整斜拉索的索力使連續(xù)剛構(gòu)橋的應(yīng)力狀態(tài)達(dá)到最優(yōu),并約束其繼續(xù)下?lián)�。�?jù)此,提出了組合加固體系的索力計(jì)算方法,結(jié)合影響矩陣法在MIDAS/CIVIL的具體應(yīng)用 未知荷載系數(shù)法,確定合理成橋狀態(tài)的索力,運(yùn)用差值法正迭代計(jì)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?yàn)楣こ瘫尘?識別加固前大跨度連續(xù)剛構(gòu)橋已存應(yīng)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(shè)計(jì)參數(shù),分析計(jì)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(tǒng)的體外預(yù)應(yīng)力加固方法及加固原理,并與單索面斜拉體系加固方法進(jìn)行各項(xiàng)橋梁指標(biāo)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(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U448.23;U445.72

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本文編號：1797134