大跨自錨式懸索橋運營安全分析研究
發(fā)布時間：2019-01-30 14:31
【摘要】：大跨自錨式懸索橋?qū)儆谌嵝岳|索體系懸索橋的一種。吊索作為自錨式懸索橋的主要傳力構(gòu)件，其安全性與耐久性關(guān)系到整個橋梁結(jié)構(gòu)的運營安全，，吊索損壞可能會嚴重影響橋梁結(jié)構(gòu)的安全；此外，鋼箱梁的橋面鋪裝厚度、環(huán)境溫度變化以及車輛超載等對大跨度自錨式懸索橋的運營安全的影響也不容忽視。本文以桃花峪黃河大橋雙塔三跨自錨式懸索橋為背景，對大跨自錨式懸索橋的運營安全進行研究分析，主要工作內(nèi)容和結(jié)論如下： 1．總結(jié)了自錨式懸索橋的結(jié)構(gòu)體系，受力特點，對自錨式懸索橋的合理成橋狀態(tài)、吊索破損的模擬方法、橋梁鋪裝、溫度作用以及車輛超載的研究現(xiàn)狀進行綜述。 2．利用Midas/Civil軟件建立桃花峪黃河大橋的全橋有限元模型，根據(jù)先化整為零，組合成橋的分步方法確定成橋索力，然后計算主纜的幾何線形和吊索的無應(yīng)力長度，并得到該橋的合理成橋狀態(tài)。 3．在合理成橋狀態(tài)的基礎(chǔ)上，采用靜力法對吊索斷裂進行模擬對比分析，在已有理論的基礎(chǔ)上，以鋼結(jié)構(gòu)達到屈服強度或者剩余吊索的最大拉應(yīng)力達到材料容許拉應(yīng)力作為結(jié)構(gòu)發(fā)生破壞的評判準則，選擇不同位置，不同吊索發(fā)生斷裂的工況，對橋梁結(jié)構(gòu)的安全影響進行分析，通過分析可得出單根吊索發(fā)生斷裂時，橋梁結(jié)構(gòu)的靜力性能影響有限，當連續(xù)出現(xiàn)兩根或者三根吊索斷裂時，會影響橋梁的主體結(jié)構(gòu)，增加橋梁修復(fù)的難度，特別是應(yīng)對橋梁跨中附近的短吊索和斷裂吊索附近相鄰的吊索加強防護。 4．在成橋狀態(tài)的基礎(chǔ)上，考慮鋼箱梁橋面鋪裝施工中的偏差，通過改變鋪裝層的厚度和位置來模擬橋面鋪裝層的不均勻，分析鋼箱梁橋面鋪裝不均勻時對自錨式懸索橋結(jié)構(gòu)后期運營的影響。分析可得，橋面鋪裝層厚度的增加與主梁位移變化成正比例，對吊索受力變化影響很小，對橋梁整體受力及運營安全影響有限。 5．在成橋狀態(tài)的基礎(chǔ)上，按照設(shè)計規(guī)范中溫度荷載的規(guī)定，對結(jié)構(gòu)進行整體升降溫和溫度梯度分析，分析自錨式懸索橋結(jié)構(gòu)索力變化和位移變化，并對整體結(jié)構(gòu)安全進行分析。得出整體升降溫對自錨式懸索橋的影響不大，頂?shù)装宓臏夭畹挠绊懕容^顯著，日溫的變化對鋼箱梁影響較大。 6．在成橋狀態(tài)的基礎(chǔ)上，分析車輛超載對自錨式懸索橋結(jié)構(gòu)的影響，為橋梁的運營安全提供理論依據(jù)。隨著超載系數(shù)的增大，主梁最大豎向位移和主纜應(yīng)力不斷增加，計算出的主梁的超載安全度為2.04，主纜的超載安全度為1.32。車輛超載對自錨式懸索橋結(jié)構(gòu)的運營安全有很大影響。
[Abstract]:Long span self-anchored suspension bridge belongs to the flexible cable system suspension bridge. As the main force transfer component of self-anchored suspension bridge, the safety and durability of the sling are related to the operation safety of the whole bridge structure, and the damage of the slings may seriously affect the safety of the bridge structure. In addition, the influence of deck pavement thickness, ambient temperature change and vehicle overload on the operation safety of long-span self-anchored suspension bridge can not be ignored. Based on the two-tower and three-span self-anchored suspension bridge of Taohuayu Yellow River Bridge, the operation safety of long-span self-anchored suspension bridge is studied and analyzed in this paper. The main contents and conclusions are as follows: 1. The structure system of self-anchored suspension bridge is summarized. In this paper, the reasonable state of self-anchored suspension bridge, the simulation method of sling breakage, the bridge pavement, the effect of temperature and the overloading of vehicle are summarized. 2. The finite element model of the whole bridge of Taohuayu Yellow River Bridge is established by using Midas/Civil software. The cable force of the bridge is determined by the stepwise method of combining the bridge, and then the geometric alignment of the main cable and the stress free length of the sling are calculated. The reasonable state of the bridge is obtained. 3. On the basis of the reasonable state of the bridge, the static method is used to simulate and analyze the sling fracture, and on the basis of the existing theories, When the steel structure reaches yield strength or the maximum tensile stress of the remaining sling reaches the material allowable tensile stress is taken as the criterion for judging the failure of the structure, and the failure conditions of different slings are chosen at different locations. Through the analysis of the safety effect of bridge structure, it can be concluded that the static energy of bridge structure is limited when a single sling is broken, and the main structure of the bridge will be affected when two or three sling cables break continuously. It is difficult to repair the bridge, especially to strengthen the protection of the short slings near the middle span of the bridge and the adjacent slings near the broken slings. 4. On the basis of the state of the bridge, considering the deviation in the bridge deck pavement construction of steel box girder, by changing the thickness and position of the pavement layer, the non-uniformity of the bridge deck pavement can be simulated. The influence of uneven deck paving of steel box girder on the late operation of self-anchored suspension bridge is analyzed. It can be concluded that the increase of bridge deck pavement thickness is in direct proportion to the displacement of the main beam and has little effect on the stress change of the slings and limited influence on the overall force and operation safety of the bridge. 5. On the basis of the state of the completed bridge, according to the temperature load stipulated in the design code, the integral lifting and temperature gradient analysis of the structure is carried out, and the variation of the cable force and displacement of the self-anchored suspension bridge structure is analyzed. The safety of the whole structure is analyzed. It is concluded that the whole rise and cooling has little effect on the self-anchored suspension bridge, the effect of the temperature difference on the top and bottom plate is obvious, and the change of the daily temperature has a great influence on the steel box girder. 6. The influence of vehicle overload on the structure of self-anchored suspension bridge is analyzed on the basis of the state of the completed bridge, which provides the theoretical basis for the operation safety of the bridge. With the increase of the overload coefficient, the maximum vertical displacement and the stress of the main cable increase continuously. The calculated overloading safety degree of the main beam is 2.04 and the overloading safety degree of the main cable is 1.32. Vehicle overload has great influence on the operation safety of self-anchored suspension bridge.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.25
本文編號：2418230
[Abstract]:Long span self-anchored suspension bridge belongs to the flexible cable system suspension bridge. As the main force transfer component of self-anchored suspension bridge, the safety and durability of the sling are related to the operation safety of the whole bridge structure, and the damage of the slings may seriously affect the safety of the bridge structure. In addition, the influence of deck pavement thickness, ambient temperature change and vehicle overload on the operation safety of long-span self-anchored suspension bridge can not be ignored. Based on the two-tower and three-span self-anchored suspension bridge of Taohuayu Yellow River Bridge, the operation safety of long-span self-anchored suspension bridge is studied and analyzed in this paper. The main contents and conclusions are as follows: 1. The structure system of self-anchored suspension bridge is summarized. In this paper, the reasonable state of self-anchored suspension bridge, the simulation method of sling breakage, the bridge pavement, the effect of temperature and the overloading of vehicle are summarized. 2. The finite element model of the whole bridge of Taohuayu Yellow River Bridge is established by using Midas/Civil software. The cable force of the bridge is determined by the stepwise method of combining the bridge, and then the geometric alignment of the main cable and the stress free length of the sling are calculated. The reasonable state of the bridge is obtained. 3. On the basis of the reasonable state of the bridge, the static method is used to simulate and analyze the sling fracture, and on the basis of the existing theories, When the steel structure reaches yield strength or the maximum tensile stress of the remaining sling reaches the material allowable tensile stress is taken as the criterion for judging the failure of the structure, and the failure conditions of different slings are chosen at different locations. Through the analysis of the safety effect of bridge structure, it can be concluded that the static energy of bridge structure is limited when a single sling is broken, and the main structure of the bridge will be affected when two or three sling cables break continuously. It is difficult to repair the bridge, especially to strengthen the protection of the short slings near the middle span of the bridge and the adjacent slings near the broken slings. 4. On the basis of the state of the bridge, considering the deviation in the bridge deck pavement construction of steel box girder, by changing the thickness and position of the pavement layer, the non-uniformity of the bridge deck pavement can be simulated. The influence of uneven deck paving of steel box girder on the late operation of self-anchored suspension bridge is analyzed. It can be concluded that the increase of bridge deck pavement thickness is in direct proportion to the displacement of the main beam and has little effect on the stress change of the slings and limited influence on the overall force and operation safety of the bridge. 5. On the basis of the state of the completed bridge, according to the temperature load stipulated in the design code, the integral lifting and temperature gradient analysis of the structure is carried out, and the variation of the cable force and displacement of the self-anchored suspension bridge structure is analyzed. The safety of the whole structure is analyzed. It is concluded that the whole rise and cooling has little effect on the self-anchored suspension bridge, the effect of the temperature difference on the top and bottom plate is obvious, and the change of the daily temperature has a great influence on the steel box girder. 6. The influence of vehicle overload on the structure of self-anchored suspension bridge is analyzed on the basis of the state of the completed bridge, which provides the theoretical basis for the operation safety of the bridge. With the increase of the overload coefficient, the maximum vertical displacement and the stress of the main cable increase continuously. The calculated overloading safety degree of the main beam is 2.04 and the overloading safety degree of the main cable is 1.32. Vehicle overload has great influence on the operation safety of self-anchored suspension bridge.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.25
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