竖转提升工艺下拱肋体系转换与合龙控制方法研究
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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.
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.
引文
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[2]尹浩辉.广州丫髻沙大桥转体工艺设计构思的特色和探讨[J].福州大学学报(自然科学版),2000,28(4):60-65.(YIN Hao-hui.A Probe into the Design Conception of Rotary Construction of Yajisha Bridge in Guangzhou[J].Journal of Fuzhou University(Natural Science Edition),2000,28(4):60-65.in Chinese)
[3]尹紫红,董启军,卢演慧.西江特大桥连续刚构-柔性拱拱肋竖转设计与施工[J].铁道建筑,2012(5):26-28.(YIN Zi-hong,DONG Qi-jun,LU Yan-hui.Design and Construction of Arch Rib Vertical Rotation for Continuous Rigid Frame and Flexible Arch of Xijiang River Bridge[J].Railway Engineering,2012(5):26-28.in Chinese)
[4]赵剑发.准朔铁路黄河特大桥主桥钢管拱架设方案比选[J].桥梁建设,2015,45(1):108-113.(ZHAO Jian-fa.Comparison and Selection of Erection Schemes for Steel Tube Arch of Main Bridge of Huanghe River Bridge on Zhungeer-Shuozhou Railway[J].Bridge Construction,2015,45(1):108-113.in Chinese)
[5]刘晖,向坤山,赵如东.五里亭大桥的设计与施工[J].公路与汽运,2006(3):149-151.(LIU Hui,XIANG Kun-shan,ZHAO Ru-dong.Design and Construction of Wuliting Bridge[J].Highway&Automobile Applications,2006(3):149-151.in Chinese)
[6]粟学平,李德钦.佛山东平大桥主桥拱肋拼装方案比选[J].四川建筑科学研究,2011,37(6):286-290.(SU Xue-ping,LI De-qin.Comparison and Selection of Arch Rib Assembly Schemes of Main Bridge of Dongping Bridge in Foshan[J].Sichuan Building Science,2011,37(6):286-290.in Chinese)
[7]张晓华,柴学宗.东湖特大桥112 m提篮拱卧拼竖转施工技术[J].铁道建筑,2010(1):75-77.(ZHANG Xiao-hua,CHAI Xue-zong.Construction Technology for Horizontal Assembling and Vertical Rotating of 112-m Span Basket Handle Arch of East Lake Bridge[J].Railway Engineering,2010(1):75-77.in Chinese)
[8]高志松,徐岳震.滹沱河大桥转体施工提升塔架强度和稳定性研究[J].施工技术,2011,40(21):76-78.(GAO Zhi-song,XU Yue-zhen.Study of Strength and Stability of Hoisting Tower for Vertical Rotation Construction of Hutuo River Bridge[J].Construction Technology,2011,40(21):76-78.in Chinese)
[9]张显明.钢管混凝土拱桥拱肋整体竖转吊装线形控制[J].公路,2011(11):61-64.(ZHANG Xian-ming.Geometric Control of Integral Vertical Rotation and Lifting of Arch Rib of ConcreteFilled Steel Pipe Arch Bridge[J].Highway,2011(11):61-64.in Chinese)
[10]吴阳.大跨度单肋拱桥竖转施工及吊杆张拉过程分析(硕士学位论文)[D].大连:大连理工大学,2012.(WU Yang.Analysis of Vertical Rotation Construction and Suspender Tensioning Sequence for Long Span Single-Rib Arch Bridge(Master Dissertation)[D].Dalian:Dalian University of Technology,2012.in Chinese)
[11]苑仁安,秦顺全,王帆.分阶段成形杆系结构几何非线性平衡方程[J].桥梁建设,2014,44(2):50-55.(YUAN Ren-an,QIN Shun-quan,WANG Fan.Equilibrium Equation for Geometric Nonlinearity of Frame Structure Formed in Stages[J].Bridge Construction,2014,44(2):50-55.in Chinese)
[12]孙九春.赵家沟大桥临时支架设计[J].世界桥梁,2015,43(1):11-17.(SUN Jiu-chun.Design of Temporary Support System for Zhaojiagou Bridge[J].World Bridges,2015,43(1):11-17.in Chinese)