超高墩大跨连续刚构桥的受力特性与施工控制研究

发布时间：2018-11-20 13:30

【摘要】：随着国家西部大开发战略的推行,以及国家对基础设施建设的大量投入,公路交通事业迎来快速发展时期。我国西南地区多为山岭地貌,山区高等级公路的发展离不开高墩大跨桥梁的建设,而巨大的海拔落差使得超高墩大跨径连续刚构桥有了充分的发展空间。相对于墩高较低的连续刚构桥,超高墩桥梁在设计和建设过程中需要考虑更为复杂的由于墩高及其他因素引起的结构受力、稳定性和施工控制技术等关键问题。本文依托马河特大桥进行的研究工作及取得的成果包括:(1)分析了在温度、活载、收缩徐变、恒载作用下墩高的不对称性对超高墩连续刚构桥结构受力与变形的影响,得到不同墩高组合下的主梁内力、桥墩应力以及墩顶位移的变化规律,对结构设计提出了建议。(2)针对超高墩连续刚构的稳定性问题,分析讨论了桥墩高度的变化对桥梁结构在最高裸墩状态、最大悬臂状态以及成桥状态时的稳定性影响,总结了其影响规律。(3)依托马河特大桥,分析了双肢薄壁墩间横系梁对结构稳定性的影响。并对马河特大桥的横系梁拆除时机进行了理论分析,分析表明,不同状态下拆除横系梁对结构稳定性及受力的影响不同,马河特大桥双肢薄壁墩间横系梁在边跨合龙段锁定之前予以拆除是合理的。(4)基于温度效应分析理论,进行了桥梁结构最高裸墩及最大悬臂状态时温度效应对结构变形的影响分析,总结和提出了主墩施工过程的垂直度控制措施及主梁施工过程中减小温度影响的控制措施,为马河特大桥超高主墩以及主梁悬臂施工过程控制提供了理论依据与控制方法,达到了良好的应用效果。
[Abstract]:With the implementation of the strategy of western development and the investment of the country in the construction of infrastructure, the highway transportation industry is facing a period of rapid development. The mountain landforms are mostly in the southwest of China. The development of high-grade highway in mountainous area can not be separated from the construction of high-pier and long-span bridges, and the huge altitude drop makes the continuous rigid frame bridges with super-high piers and long span have sufficient development space. Compared with the continuous rigid frame bridge with low pier height, the design and construction of super-high pier bridge need to consider more complex structural stress, stability and construction control technology caused by pier height and other factors. Based on the research work of Mahe Bridge, this paper analyzes the influence of the asymmetry of pier height on the stress and deformation of the continuous rigid frame bridge with super high piers under the action of temperature, live load, shrinkage, creep and dead load, including: (1) the influence of temperature, live load, shrinkage, creep and dead load on the structure of continuous rigid frame bridge with super high piers. The internal force of main beam, the stress of bridge pier and the displacement of pier top under different combination of piers are obtained, and some suggestions for structural design are put forward. (2) the stability of continuous rigid frame with super-high piers is discussed. The influence of the height of piers on the stability of the bridge structure under the highest bare pier state, the maximum cantilever state and the bridge completion state is analyzed and discussed. (3) the influence law of the bridge is summarized. The influence of cross beam between two-leg thin-walled piers on structural stability is analyzed. The time of removing the transverse beam of the Mahe Bridge is analyzed theoretically. The results show that the effect of removing the transverse beam on the stability and force of the structure is different under different conditions. It is reasonable to remove the transverse beam between thin-walled piers of Mahe Bridge before the closure section of the side span is locked. (4) based on the theory of temperature effect analysis, The influence of temperature effect on the deformation of bridge structure under the maximum bare pier and the maximum cantilever state is analyzed. The vertical control measures during the construction of the main pier and the control measures to reduce the temperature effect during the construction of the main girder are summarized and put forward. It provides the theoretical basis and control method for the construction process control of the super high main pier and the cantilever of the main beam of the Mahe super bridge, and achieves the good application effect.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.4;U448.23

【相似文献】