城市桥梁超高顶升支撑系统空间仿真分析
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摘要
为研究连续箱混凝土梁桥顶升过程中支撑系统的结构力学特征,以国内最大顶升高度的厦门市仙岳路高架桥改造工程为依托,考虑顶升点失效,采用Midas/Civil有限元软件建立三维数值模型,展开3种不同工况下桥墩支撑系统的整体静力分析和屈曲分析。结果表明:钢支撑系统非顶升钢筒较顶升钢筒的应力变化敏感度小;第1、2道方钢应力变化较第3、4道方钢敏感,变化幅度是第3、4道方钢的3.1倍左右;顶升点失效引起的支撑系统稳定系数变化幅度约为11%～34%。该桥顶升改造后已安全运营3 a,结构整体安全。该研究结果可为类似桥梁顶升的支撑系统设计提供借鉴。
In order to study the structural and mechanical characteristics of the support system of continuous box concrete girder bridge in the jacking process, relying on the maximum jacking height of Xiamen Xianyue Road Elevated Bridge Reconstruction Project in China and considering the failure of jacking point, athree-dimensional numerical model is established by using Midas/Civil finite element software to carry out the overall static analysis and buckling analysis of pier support system under three different consturction conditions.The results show that the stress change sensitivity of non-jacking steel cylinder in steel support system is smaller than that of jacking steel cylinder; the stress changes of the first and the second square steels are more sensitive than that of the third and fourth square steels, and the change ranges are about 3.1 times of that of the third and fourth square steels; and the change range of stability coefficient of support system caused by the failure of jacking point is about 11 % ～34%. The bridge has been operated safely for three years after the jacking reconstruction and the structure is safe as a whole. The study results can provide the reference for the design of the similar bridge jacking support systems.
In order to study the structural and mechanical characteristics of the support system of continuous box concrete girder bridge in the jacking process, relying on the maximum jacking height of Xiamen Xianyue Road Elevated Bridge Reconstruction Project in China and considering the failure of jacking point, athree-dimensional numerical model is established by using Midas/Civil finite element software to carry out the overall static analysis and buckling analysis of pier support system under three different consturction conditions.The results show that the stress change sensitivity of non-jacking steel cylinder in steel support system is smaller than that of jacking steel cylinder; the stress changes of the first and the second square steels are more sensitive than that of the third and fourth square steels, and the change ranges are about 3.1 times of that of the third and fourth square steels; and the change range of stability coefficient of support system caused by the failure of jacking point is about 11 % ～34%. The bridge has been operated safely for three years after the jacking reconstruction and the structure is safe as a whole. The study results can provide the reference for the design of the similar bridge jacking support systems.
引文
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[2]李俊哲,唐进锋,常征.沉降对桥上无缝道岔力学特性影响分析[J].铁道科学与工程学报,2016,13(02):250-256.
[3]徐宏,郭敏.既有简支梁桥整体同步顶升施工技术[J].世界桥梁,2016,44(2):82-86.
[4]吴毅彬.预应力混凝土连续弯箱梁桥同步顶升纠扭施工[J].世界桥梁,2012,40(3):72-76.
[5]陈梁,朱利明,蒋湘成.斜交连续梁顶升过程仿真分析[J].中外公路,2016,(4):161-166.
[6]陈舟,颜全胜,何振族.北江大桥引桥整体顶升施工仿真分析[J].桥梁建设,2015,(3):99-103.
[7]余晓琳.北江大桥引桥整体顶升施工技术[J].桥梁建设,2014,44(1):114-120.
[8]周松,常光照,孟晓亮,等.大跨径混凝土连续梁桥整体顶升施工分析[J].桥梁建设,2017,47(3):116-120.
[9]王伟,刘昀,丁毅.连续梁桥多跨整联同步顶升施工计算分析[J].中外公路,2017(3):102-106.
[10]蒋岩峰.桥梁调坡顶升关键技术之顶升支撑技术探讨[J].城市道桥与防洪,2013(11):76-80.
[11]袁鑫,郑伟,杨浩,等.城市桥梁大行程同步顶升支撑系统空间仿真非线性分析[J].振动与冲击,2014,33(4):22-26.
[12]束学智,冯思雨.城市桥梁超高顶升改造施工[A].工程质量学术会议论文集[C]. 2016.
[13] JTG D64—2015.公路桥涵钢结构及木结构设计规范[S].