摘要
由于竖转提升工艺下大跨度拱肋在合龙前、后的力学状态相差较大,为确保合龙后拱肋的力学状态满足要求,根据拱结构的受力特点提出了一种基于自平衡原理的体系转换方法;并根据拱肋节段的制造安装工艺提出了基于无应力状态法的拱肋合龙控制方法。为验证上述方法的正确性和有效性,以赵家沟大桥的竖转提升为背景,采用ANSYS有限元软件建立该桥竖转提升模型进行数值模拟分析,并对拱肋合龙前、后的力学状态进行监测。结果表明:各构件的力学状态均满足设计要求;合龙后拱肋应力的实测值与计算值基本一致,拱肋实测线形与设计线形偏差较小。实践证明,基于自平衡原理的体系转换法是可行的,无应力状态合龙法可用于指导竖转提升工艺下的拱肋合龙控制。
The force conditions of the long span arch rib constructed by the vertical rotation and lifting differ greatly before and after the closure of the rib.To ensure that the force conditions of the arch rib could meet the requirements after the closure,a system transformation method for the rib based on the self-balancing principle was proposed in accordance with the force condition characteristics of the arch structure and a closure control method for the rib based on the unstressed state method was proposed as well in accordance with the fabrication and installation workmanship for the segments of the rib.To verify the correctness and effectiveness of the methods,the construction of the vertical rotation and lifting of the Zhaojiagou Bridge was cited as an example.The finite element software ANSYS was used to establish the model for the vertical rotation and lifting of the arch rib of the bridge,the numerical simulation analysis of the model was implemented and the force conditions of the rib before and after the closure were monitored.The results show that the force conditions of the different components of the rib of the bridge can meet the design requirements,the measurement and calculation values of the stress of the rib after the closure are basically identical and the deviations of the measured and designed geometric shapes of the rib are slight.Practice proves that the system transformation method based on the self-balancing principle is feasible and the closure control method based on the unstressed state method can be used to guide the closure control of the rib constructed by the vertical rotation and lifting.
出处
《桥梁建设》
EI
CSCD
北大核心
2017年第1期53-58,共6页
Bridge Construction
关键词
拱桥
竖转提升工艺
合龙
体系转换
无应力状态
有限元法
应力监测
施工控制
arch bridge
vertical rotation and lifting technology
closure
system transformation
unstressed state
finite element method
stress monitoring
construction control
