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近年来,随着交通量和车辆荷载的增加,大跨度连续刚构桥出现了严重的下挠和裂缝等病害,导致自身承载力严重不足。目前,对于较小跨径桥梁加固技术应用已趋于成熟,但在大跨度连续刚构桥加固技术方面的研究仍面临诸多挑战。为能解决现有加固技术不能有效提高大跨度连续刚构桥承载力的问题,该文提出了一种用于加固大跨度连续刚构桥的体外张弦梁加固技术,并以某已建连续刚构桥作为依托工程,对设计的体外张弦梁方案进行对比分析,并基于正常加载、超载、预应力损失影响因素下,研究体外张弦梁对大跨度连续刚构桥的加固成效。结果表明:采用体外张弦梁加固技术,不仅可以有效地提高大跨度连续刚构桥的承载能力,而且体外张弦梁因自身结构的可调性能,使其可灵活应用于桥下净空要求低的桥梁。
In recent years, with the increase of traffic volume and vehicle load, serious long-span continuous rigid frame bridge suffered serious problems such as deflection and cracks, leading to a serious shortage of its own bearing capacity. At present, the application of the reinforcement technology of the smaller span bridges has matured, but the research on the reinforcement technology of the long span continuous rigid frame bridge still faces many challenges. In order to solve the problem that the existing reinforcement technology can not effectively improve the bearing capacity of the long-span continuous rigid frame bridge, an in vitro beam string reinforcement technology for reinforcing the long-span continuous rigid frame bridge is proposed. The bridge as a relying on engineering, the design of the external string string beam program for comparative analysis, and based on the normal load, overload, loss factors of prestress, the study of the external string string beam on the long-span continuous rigid frame bridge reinforcement effect. The results show that using the beam string reinforcement technology in vitro can not only effectively improve the bearing capacity of the long-span continuous rigid frame bridge, but also make it flexible to be applied to the bridges with low headroom requirements because of its adjustable structure.