本文選題：無背索斜拉橋 + 有限元��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：無背索斜拉橋具有結(jié)構(gòu)新穎、造型優(yōu)美的特點(diǎn)。但是無背索斜拉橋特殊的結(jié)構(gòu)形式,導(dǎo)致其空間受力狀態(tài)與常規(guī)斜拉橋有很大不同,傾斜橋塔的穩(wěn)定性要求比較高。本文以六安壽春西路無背索斜拉橋?yàn)楣こ瘫尘?借助有限元方法,根據(jù)設(shè)計圖紙來建立有限元模型,分析無背索雙斜塔斜拉橋的結(jié)構(gòu)受力行為、穩(wěn)定性和極限承載力,從整體上把握橋梁的極限承載力和失穩(wěn)行為,可為同類型橋梁的設(shè)計與施工提供參考。論文的主要工作內(nèi)容包括:1.建立了壽春西路無背索斜拉橋有限元桿系單元模型,進(jìn)行了靜力分析和參數(shù)影響分析。結(jié)果表明,在設(shè)計張拉索力下,主梁抗彎剛度較大,主梁的跨中撓度值較小,但塔頂?shù)奈灰葡啾扔谥髁何灰票容^明顯,這是由于無背索斜拉橋的橋塔是傾斜的,如果拉索拉力不夠大,在自重作用下會發(fā)生較大位移。所以在拉索強(qiáng)度和塔根部混凝土強(qiáng)度滿足設(shè)計規(guī)范的要求下,成橋階段應(yīng)盡可能的增大張拉索力的大小。2.建立了壽春西路無背索斜拉橋有限元板殼實(shí)體單元模型,并與桿系單元模型進(jìn)行了比較。實(shí)體建模非常復(fù)雜,而且計算量很大。計算結(jié)果偏于保守,但是可以更好地模擬關(guān)鍵部位的局部力學(xué)行為。因此對于大型的橋梁結(jié)構(gòu),一般可建立梁單元的整體模型,在需要更準(zhǔn)確的考慮局部地區(qū)的破壞行為時,有必要建立板殼實(shí)體單元建立局部模型進(jìn)行局部分析。3.采用壽春西路無背索斜拉橋有限元桿系單元模型,進(jìn)行了自重作用下的彈性穩(wěn)定性分析。結(jié)果發(fā)現(xiàn),首先發(fā)生的是主塔橫向彎曲失穩(wěn),屈曲系數(shù)是6.79,表明壽春西路橋的整體彈性穩(wěn)定性較好。若只考慮一階彈性失穩(wěn)的情況下,主塔和副塔的兩個塔柱不需要固結(jié),壽春西路橋的結(jié)構(gòu)穩(wěn)定性在鉸接的情況下仍然滿足要求。4.采用壽春西路無背索斜拉橋有限元桿系單元模型,進(jìn)行了非線性穩(wěn)定分析和非線性因素影響分析。結(jié)果表明,幾何非線性對該橋的極限承載力影響不大,但材料非線性影響很大,是全橋極限承載力的控制因素。在初始張拉索力下,壽春西路橋極限承載時的破壞路徑是鋼箱梁先發(fā)生屈服破壞,此時索力尚未達(dá)到極限狀態(tài)。
[Abstract]:The cable-stayed bridge without back cable has the characteristic of novel structure and beautiful shape. However, the special structural form of cable-stayed bridge without back cable leads to a great difference between the spatial stress state and the conventional cable-stayed bridge, and the stability of inclined tower is very high. In this paper, based on the engineering background of Liu'an Shouchun West Road cable-stayed bridge without back cable, the finite element model is established according to the design drawing by means of finite element method, and the structural behavior, stability and ultimate bearing capacity of the cable-stayed bridge with double inclined tower without back cable are analyzed. To grasp the ultimate bearing capacity and unstable behavior of the bridge as a whole can provide a reference for the design and construction of the same type of bridge. The main work of the thesis includes 1: 1. The finite element element model of the cable stayed bridge with no back cable on Shouchun West Road is established, and the static analysis and parameter influence analysis are carried out. The results show that the flexural stiffness of the main beam is larger and the deflection of the main beam is smaller than that of the main beam, but the displacement of the tower top is more obvious than that of the main beam, which is because the tower of the cable-stayed bridge without back cable is inclined. If the cable tension is not large enough, a large displacement will occur under the action of self-gravity. Therefore, the cable strength and the concrete strength at the root of the tower meet the requirements of the design code, the bridge stage should be as much as possible to increase the size of tension. 2. The finite element model of plate and shell of Shouchun Xilu cable-stayed bridge without back cable is established and compared with the element model of bar system. Solid modeling is very complex and computationally expensive. The calculated results are conservative, but can better simulate the local mechanical behavior of the key sites. Therefore, for large bridge structure, the integral model of beam element can be established generally. When the failure behavior of local area needs to be considered more accurately, it is necessary to establish a local model of plate and shell entity element for local analysis. Based on the finite element model of the cable stayed bridge with no back cable in Shouchun West Road, the elastic stability of the cable-stayed bridge under deadweight is analyzed. The results show that the lateral buckling instability of the main tower occurs first, and the buckling coefficient is 6.79, which indicates that the overall elastic stability of Shouchun West Road Bridge is better. If only the first order elastic instability is considered, the two tower columns of the main tower and the secondary tower do not need to be consolidated, and the structural stability of the Shouchun West Road Bridge still meets the requirement of .4in the case of hinge connection. The nonlinear stability analysis and the influence of nonlinear factors are carried out by using the finite element model of the cable stayed bridge with no back cable in Shouchun West Road. The results show that the geometric nonlinearity has little effect on the ultimate bearing capacity of the bridge, but the material nonlinearity has a great influence on the ultimate bearing capacity of the bridge, which is the controlling factor of the ultimate bearing capacity of the whole bridge. Under the initial tension, the failure path of Shouchun West Road Bridge is the yield failure of the steel box girder, and the cable force has not reached the limit state.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.27

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