钢箱梁顶推参数影响及稳定性分析
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摘要
为了研究钢箱主梁顶推施工过程的受力特点及其局部稳定性,结合某钢箱自锚式悬索桥,分析导梁的各个设计参数对顶推过程受力及变形的影响,分析表明导梁前端最大位移、导梁根部弯矩及钢箱梁最大拉、压应力均随顶推过程呈现周期性的变化,导梁的弹性模量及泊松比的变化对顶推过程受力及变形的影响较小,导梁的长度及其平均线重度对顶推过程受力及变形的影响较大。其次,以弹性薄板的小挠度理论为基础,分析钢箱梁顶推过程的局部稳定性,计算表明,钢箱梁未加劲前,局部稳定性不满足要求,加劲之后则满足要求。考虑板组间的约束因素、材料非线性、初始几何缺陷及残余应力等的影响,结构自重引起的应力对结构的屈曲临界应力影响很小,可以忽略不计;横隔板的设置对提高钢箱梁局部屈曲效果明显。
In order to further study stress characteristics and the local stability of steel box girder during incremental launching construction, first, combined with a self-anchored suspension bridge with steel box girder,influence analysis for incremental launching process with design parameters was carried out. Analysis shows that maximal displacement at the front of guide beam, bending moment at steel guide beam root and maximum tensile stress of steel box girder as well as compressive stress of steel box girder are periodical change along with the construction process. Meanwhile, elastic modulus and Poisson ratio have a little influence on stress and deformation of steel box girder during incremental launching process, length of steel guide beam and its average weight have an important influence on stress and deformation of steel box girder during incremental launching process. Secondly, on the basis of elastic thin plate theory of small deflection, local stability analysis of steel box girders during the process of incremental launching have been carried out. Theoretical calculation shows that local stability of steel box girder does not meet the requirements before stiffening, after stiffening, the requirements is meet. Considered constraint factors between plate groups, material nonlinearity and initial geometric imperfection and residual stress, finite element analysis showed that the stress by self weight has a little influence on critical buckling stress, it can be neglected; Installing diaphragm plate to improve the effect of local buckling of steel box girder is obvious.
In order to further study stress characteristics and the local stability of steel box girder during incremental launching construction, first, combined with a self-anchored suspension bridge with steel box girder,influence analysis for incremental launching process with design parameters was carried out. Analysis shows that maximal displacement at the front of guide beam, bending moment at steel guide beam root and maximum tensile stress of steel box girder as well as compressive stress of steel box girder are periodical change along with the construction process. Meanwhile, elastic modulus and Poisson ratio have a little influence on stress and deformation of steel box girder during incremental launching process, length of steel guide beam and its average weight have an important influence on stress and deformation of steel box girder during incremental launching process. Secondly, on the basis of elastic thin plate theory of small deflection, local stability analysis of steel box girders during the process of incremental launching have been carried out. Theoretical calculation shows that local stability of steel box girder does not meet the requirements before stiffening, after stiffening, the requirements is meet. Considered constraint factors between plate groups, material nonlinearity and initial geometric imperfection and residual stress, finite element analysis showed that the stress by self weight has a little influence on critical buckling stress, it can be neglected; Installing diaphragm plate to improve the effect of local buckling of steel box girder is obvious.
引文
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[8]董创文,李传习,张玉平,等.变曲率竖曲线梁顶推过程支点标高调整方案确定的单步模数搜索合成法[J].土木工程学报,2015,48(1):101-111.DONG Chuanwen,LI Chuanxi,ZHANG Yuping,et al.Single-step modulus search and composition method for determining the scheme of support elevation adjustment during girder launching with vertically varied curvatures[J].China Civil Engineering Journal,2015,48(1):101-111.
[9]秦林,陈进芬,胡海洋,等.北盘江大桥合龙顶推方案研究[J].世界桥梁,2013,41(3):43-46.QIN Lin,CHEN Jinfen,HU Haiyang,et al.Study of incremental launching schemes for closure of Beipanjiang River bridge[J].World Bridges,2013,41(3):43-46.
[10]陈双庆,谭光耀.单点顶推施工支撑墩受力分析及优化研究[J].湖南交通科技,2015,41(3):92-95.CHEN Shuangqing,TAN Guangyao.Supporting pier stress analysis and optimization research with direct incremental launching[J].Hunan Communication Science and Technology,2015,41(3):92-95.
[11]WANG J,LIN J,CHEN C,et al.Simulation analysis and control research of long multi-span composite bridge with incremental launching construction[C]//Proceedings of the 11th International Conference of Chinese Transportation Professionals.Nanjing,2011:3078-3090
[12]张晓东.桥梁顶推施工技术[J].公路,2003(9):45-51.ZHANG Xiaodong.The incremental launching technology of bridge[J].Highway,2003(9):45-51.
[13]Beaney N J,Martin J M.Design and construction of the Dornoch Firth Bridge[C]//Proceedings of Institution Civil Engineerings,Transportation,Beijing,1993:145-156.
[14]Rosignoli Macro.Prestressing schemes for incrementally launched bridges[J].Journal of Bridge Engineering,1999(5):107-115.
[15]董创文,李传习,王琛.考虑相位变化及组拼高程误差的顶推梁体无应力线形的实现[J].土木工程学报,2013,46(8):74-82.DONG Chuangwen,LI Chuanxi,WANG Chen.Achieving unstressed geometry of incrementally launched girders considering phase shift and elevation deviation during assembly stage[J].China Civil Engineering Journal,2013,46(8):74-82.
[2]刘刚.中国和美国钢结构抗震局部稳定规定比较[J].钢结构,2011,26(114):42-45.LIU Gang.Local stability comparison of seismic provisions between Chinese and American standard[J].Steel Construction,2011,26(114):42-45.
[3]郭青锋,魏民,奇亮,等.猎德大桥钢箱梁顶推过程中局部稳定分析[J].四川建筑,2009,29(4):202-203.GUO Qingfeng,WEI Min,QI Liang,et al.Local stability analysis of steel box girder of Liede bridge in incremental launching process[J].Sichuan Architecture,2009,29(4):202-203.
[4]张玉平,袁鹏,罗超云,等.嘉绍大桥钢箱梁施工过程中局部稳定及强度分析[J].公路交通科技,2014,31(2):47-53.ZHANG Yuping,YUAN Peng,LUO Chaoyun,et al.Analysis on local stability and strength of steel box girder in construction process of Jiaxing Shaoxing Bridge[J].Journal of Highway and Transportation Research and Development,2014,31(2):47-53.
[5]李立峰,邵旭东,易伟建,等.扁平钢箱梁局部稳定模型试验[J].中国公路学报,2007,20(3):60-65.LI Lifeng,SHAO Xudong,YI Weijian,et al.Model test on local stability of flat steel box girder[J].China Journal of Highway and Transport,2007,20(3):60-65.
[6]施刚,林错错,王元清,等.高强度钢材箱形截面轴心受压短柱局部稳定试验研究[J].工业建筑,2012,42(1):18-25.SHI Gang,LIN Cuocuo,WANG Yuanqing,et al.Experimental study on local buckling of high square box section stub columns under axial strength steel compression[J].Industrial Construction,2012,42(1):18-25.
[7]田仲初,陈耀章,赵利平,等.连续钢梁顶推过程局部接触分析及改善措施[J].长安大学学报(自然科学版),2012,32(4):44-50.TIAN Zhongchu,CHEN Yaozhang,ZHAO Liping,et al.Local contact analysis and improvement measures of continuous steel girder incremental launching[J].Journal of Chang’an University(Natural Science Edition),2012,32(4):44-50.
[8]董创文,李传习,张玉平,等.变曲率竖曲线梁顶推过程支点标高调整方案确定的单步模数搜索合成法[J].土木工程学报,2015,48(1):101-111.DONG Chuanwen,LI Chuanxi,ZHANG Yuping,et al.Single-step modulus search and composition method for determining the scheme of support elevation adjustment during girder launching with vertically varied curvatures[J].China Civil Engineering Journal,2015,48(1):101-111.
[9]秦林,陈进芬,胡海洋,等.北盘江大桥合龙顶推方案研究[J].世界桥梁,2013,41(3):43-46.QIN Lin,CHEN Jinfen,HU Haiyang,et al.Study of incremental launching schemes for closure of Beipanjiang River bridge[J].World Bridges,2013,41(3):43-46.
[10]陈双庆,谭光耀.单点顶推施工支撑墩受力分析及优化研究[J].湖南交通科技,2015,41(3):92-95.CHEN Shuangqing,TAN Guangyao.Supporting pier stress analysis and optimization research with direct incremental launching[J].Hunan Communication Science and Technology,2015,41(3):92-95.
[11]WANG J,LIN J,CHEN C,et al.Simulation analysis and control research of long multi-span composite bridge with incremental launching construction[C]//Proceedings of the 11th International Conference of Chinese Transportation Professionals.Nanjing,2011:3078-3090
[12]张晓东.桥梁顶推施工技术[J].公路,2003(9):45-51.ZHANG Xiaodong.The incremental launching technology of bridge[J].Highway,2003(9):45-51.
[13]Beaney N J,Martin J M.Design and construction of the Dornoch Firth Bridge[C]//Proceedings of Institution Civil Engineerings,Transportation,Beijing,1993:145-156.
[14]Rosignoli Macro.Prestressing schemes for incrementally launched bridges[J].Journal of Bridge Engineering,1999(5):107-115.
[15]董创文,李传习,王琛.考虑相位变化及组拼高程误差的顶推梁体无应力线形的实现[J].土木工程学报,2013,46(8):74-82.DONG Chuangwen,LI Chuanxi,WANG Chen.Achieving unstressed geometry of incrementally launched girders considering phase shift and elevation deviation during assembly stage[J].China Civil Engineering Journal,2013,46(8):74-82.