竖转提升工艺下拱肋体系转换与合龙控制方法研究

发布时间：2018-05-08 16:14

本文选题：拱桥 + 竖转提升工艺　；参考：《桥梁建设》2017年01期

【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。
[Abstract]:In order to ensure that the mechanical state of the arch rib after closure meets the requirements, the mechanical state of the large-span arch rib in the vertical hoisting process is quite different before the closure of the arch rib. According to the stress characteristics of arch structure, a system transformation method based on the principle of self-balance is proposed, and a control method of arch rib closure based on non-stress state method is proposed according to the manufacturing and installation technology of arch rib segment. In order to verify the correctness and effectiveness of the above methods, taking the vertical hoisting of Zhaojiagou Bridge as the background, the ANSYS finite element software is used to establish the vertical hoisting model of the bridge to carry out numerical simulation and analysis, and to monitor the mechanical state of the arch rib before and after the closure of the arch rib. The results show that the mechanical state of each component meets the design requirements, the measured stress of arch rib after closure is basically consistent with the calculated value, and the deviation between measured and designed line shape of arch rib is small. It has been proved that the system transformation method based on self-equilibrium principle is feasible, and the stress-free closure method can be used to guide the arch rib closure control under vertical hoisting technology.
【作者单位】：同济大学地下建筑与工程系;腾达建设集团股份有限公司;
【分类号】：U445.4

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