非自平衡张弦梁体系加固大跨度连续刚构桥的加固成效与地震响应研究

随着我国经济的高速发展,伴随着交通量和车辆荷载的剧增,大跨度连续刚构桥暴露出严重的下挠和裂缝等病害致自身承载力严重不足的问题迫切需要得到解决,同样问题不乏出现在分布于地震带的大跨度连续刚构桥中。目前,在大跨度连续刚构桥加固技术方面,特别是针对其加固后的地震响应研究和应用仍较缺乏。为此,提出了一种用于加固大跨度连续刚构桥的非自平衡张弦梁体系,并以重庆奉云高速公路孙家沟大桥为依托工程,从基于超载和预应力损失影响下的静力分析和三维地震响应分析的动力分析两方面分析研究加固结构的受力特性。分析表明,非自平衡张弦梁体系可以有效地提高大跨度连续刚构桥的承载能力,且在一定程度上提高了桥梁结构的抗震能力。

The study for strengthening effect and seismic response of long-span continuous rigid frame bridge reinforced with non-self-equilibriumSbeamSstringSstructure

With the rapid development of China"s economy, along with the increase in traffic volume and vehicle load, long-span continuous rigid frame bridges has exposed serious diseases with downwarp and crack caused to the shortage of its bearing capacity, and this issues is forced to be effectively resolved. There is no lack of the same problem in long-span continuous rigid frame bridge distributed in the seismic belt. At present, it is still relatively lack in research and application for reinforcement technology of long-span continuous rigid frame bridge, especially in seismic response of the reinforcement. In this respect, this paper design a non-self-equilibrium beam string structure for long-span continuous rigid frame bridges reinforcement, and based on Sunjiagou highway bridge engineering in Chongqing Fengyun, has conducted the analysis and studying to the characteristics of structure with unreinforcement and reinforcement from two aspects, which under static loadings with influence of overload and loss of prestress, and under seismic action with response analysis of 3 d seismic input. Analysis shows that non-self-equilibrium beam string structure can effectively improve the bearing capacity of the long-span continuous rigid frame bridge, to a certain extent, also improve the anti-seismic ability of bridge structure.