獨柱墩梁橋的抗傾覆分析及加固對策研究
發(fā)布時間：2018-07-25 16:57
【摘要】：在過去，獨柱墩梁橋憑借其自身的很多優(yōu)點是高速公路互通匝道橋和城市高架、立交橋建設(shè)方案的不二選擇。但是，由于設(shè)計理論不足，近幾年各地相繼出現(xiàn)了多起獨柱墩梁橋梁體的整體側(cè)翻傾覆事故。目前，全國多個省市已逐漸開展了獨柱墩橋梁抗傾覆穩(wěn)定性的排查工作，并對需要維修加固的橋梁進行了處置。在這種背景下，進行獨柱墩梁橋的抗傾覆分析及加固對策研究具有較強的工程實用價值。 本論文以京港澳高速公路某段線路獨柱墩梁橋檢測項目為依托，對獨柱墩梁橋的抗傾覆穩(wěn)定性能及加固對策進行了分析研究。 1.通過改變橋梁平曲線曲率半徑、單支座預(yù)偏心以及雙支座的支座間距來分析統(tǒng)計并歸納這些因素對獨柱墩梁橋的抗傾覆穩(wěn)定性的影響。研究發(fā)現(xiàn)，獨柱墩直線梁橋和曲率半徑較大的彎梁橋容易發(fā)生支座脫空甚至結(jié)構(gòu)傾覆事故；設(shè)置合理的單支座偏心距和雙支座支座間距對提高橋梁結(jié)構(gòu)抗傾覆穩(wěn)定性非常有利；另外，獨柱墩梁橋在嚴重超載的情況下，橋梁出現(xiàn)支座脫空甚至上部結(jié)構(gòu)傾覆破壞的可能性會大大增加。 2.通過對支座脫空的模擬，，發(fā)現(xiàn)支座脫空對主梁內(nèi)力影響較大。支座脫空后，主梁截面的彎矩均有不同程度的增大，并且主梁各跨跨中截面的內(nèi)力增大幅度要遠遠大于支點截面。另外，支座脫空后，同一支點處支反力會重新分布。當某一支座脫空時，其同排相鄰的支座反力會迅速增大。 3.選取兩座獨柱墩梁橋，分別采用增設(shè)蓋梁法和增設(shè)墩柱法對其進行抗傾覆加固分析。分析發(fā)現(xiàn)，新加蓋梁可以在獨柱墩的一側(cè)加設(shè)，也可以在兩側(cè)對稱加設(shè)；加設(shè)蓋梁后對橋下交通的影響較小，但是對原獨柱墩的抗力性能要求較高。當原獨柱墩的承載能力富余度較小時可以采用在獨柱墩兩側(cè)加設(shè)墩柱的方式進行加固。具體采用哪種加固方式，要結(jié)合橋梁的受力特征以及經(jīng)濟合理性等多方面綜合考慮，選擇一種最優(yōu)方案。
[Abstract]:In the past, the bridge with single column piers had many advantages, such as highway interchange ramp bridge, urban viaduct and overpass. However, due to the lack of design theory, there have been many single column pier bridge overturning accidents in recent years. At present, many provinces and cities in China have gradually carried out the investigation of anti-overturning stability of single-column pier bridges, and disposed of the bridges that need maintenance and reinforcement. Under this background, it is of great practical value to analyze the overturning resistance of single column pier girder bridge and to study the reinforcement countermeasures. Based on the inspection project of single pier girder bridge on a section of Beijing-HongKong-Macao Expressway, this paper analyzes the overturning stability performance and reinforcement countermeasures of single-column pier girder bridge. By changing the curvature radius of the plane curve of the bridge, the pre-eccentricity of the single support and the support spacing of the double supports, the effects of these factors on the overturning stability of the bridge with single column pier are analyzed and summarized. It is found that the bridge with single column piers and curved beam bridges with large curvature radius is prone to the breakage of support and even overturn of the structure, and the setting of reasonable eccentricity of single support and the distance between two supports is very beneficial to improve the stability of the bridge against overturning. In addition, under the condition of serious overloading, the possibility of bridge bearing detachment or overturning damage of superstructure will increase greatly. Through the simulation of the support void, it is found that the bearing void has a great influence on the internal force of the main beam. After the support is removed the bending moment of the main beam section increases to some extent and the increasing amplitude of the internal force of the middle section of each span of the main beam is much larger than that of the fulcrum section. In addition, the support reaction at the same fulcrum will be redistributed after the support is emptied. When a bearing is empty, the reaction force of the bearing adjacent to the same row will increase rapidly. Two single column pier girder bridges are selected, and the capping method and the additional pier column method are used to analyze the overturning and strengthening respectively. It is found that the new capped beam can be installed on one side of the single column pier or symmetrically on both sides, and the influence of the cover beam on the traffic under the bridge is small, but the resistance performance of the original single column pier is higher. When the bearing capacity of the original single column pier is small, it can be strengthened by adding pier column on both sides of the single column pier. It is necessary to choose an optimal scheme by considering the bearing characteristics of the bridge and the economic rationality of the bridge.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.72;U441
本文編號：2144457
[Abstract]:In the past, the bridge with single column piers had many advantages, such as highway interchange ramp bridge, urban viaduct and overpass. However, due to the lack of design theory, there have been many single column pier bridge overturning accidents in recent years. At present, many provinces and cities in China have gradually carried out the investigation of anti-overturning stability of single-column pier bridges, and disposed of the bridges that need maintenance and reinforcement. Under this background, it is of great practical value to analyze the overturning resistance of single column pier girder bridge and to study the reinforcement countermeasures. Based on the inspection project of single pier girder bridge on a section of Beijing-HongKong-Macao Expressway, this paper analyzes the overturning stability performance and reinforcement countermeasures of single-column pier girder bridge. By changing the curvature radius of the plane curve of the bridge, the pre-eccentricity of the single support and the support spacing of the double supports, the effects of these factors on the overturning stability of the bridge with single column pier are analyzed and summarized. It is found that the bridge with single column piers and curved beam bridges with large curvature radius is prone to the breakage of support and even overturn of the structure, and the setting of reasonable eccentricity of single support and the distance between two supports is very beneficial to improve the stability of the bridge against overturning. In addition, under the condition of serious overloading, the possibility of bridge bearing detachment or overturning damage of superstructure will increase greatly. Through the simulation of the support void, it is found that the bearing void has a great influence on the internal force of the main beam. After the support is removed the bending moment of the main beam section increases to some extent and the increasing amplitude of the internal force of the middle section of each span of the main beam is much larger than that of the fulcrum section. In addition, the support reaction at the same fulcrum will be redistributed after the support is emptied. When a bearing is empty, the reaction force of the bearing adjacent to the same row will increase rapidly. Two single column pier girder bridges are selected, and the capping method and the additional pier column method are used to analyze the overturning and strengthening respectively. It is found that the new capped beam can be installed on one side of the single column pier or symmetrically on both sides, and the influence of the cover beam on the traffic under the bridge is small, but the resistance performance of the original single column pier is higher. When the bearing capacity of the original single column pier is small, it can be strengthened by adding pier column on both sides of the single column pier. It is necessary to choose an optimal scheme by considering the bearing characteristics of the bridge and the economic rationality of the bridge.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.72;U441
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相關(guān)期刊論文 前7條
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