常泰长江大桥塔柱偏心距增大系数的计算方法  

Calculation methods of pylon eccentricity magnified coefficient of Changtai Yangtze River Bridge

作　　者：黄侨[1] 黄义理 郑清刚[2] 宋晓东 郑兴 张金涛[2] HUANG Qiao;HUANG Yi-li;ZHENG Qing gang;SONG Xiao-dong;ZHENG Xing;ZHANG Jin-tao(School of Transportation,Southeast University,Nanjing 210096,Jiangsu,China;China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056Hubei,China)

机构地区：[1]东南大学交通学院,江苏南京210096 [2]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《长安大学学报（自然科学版）》2021年第3期42-51,共10页Journal of Chang’an University(Natural Science Edition)

基　　金：常泰长江大桥设计阶段研究项目(CT-SJKY-11)。

摘　　要：为探究规范公式在计算空间钻石形桥塔塔肢偏心距增大系数时的适用性,并保证大跨度斜拉桥桥塔结构配筋设计的合理性,以常泰长江大桥为工程实例,对塔柱偏心距增大系数进行了计算分析。首先基于常泰长江大桥成桥状态确定了桥塔控制截面和计算工况,并对各国规范公式中的计算长度取值进行了对比研究,其次通过有限元分析和中、美、欧桥梁规范方法对桥塔塔肢构件偏心距增大系数进行了计算,最后对有限元计算结果和各规范计算结果进行了对比分析。研究结果表明:由于常泰长江大桥桥塔结构复杂,各塔肢边界条件并不清晰,采用各规范公式计算偏心距增大系数时,相关参数取值与构件实际情况存在一定差异,不宜将桥塔塔肢作为简单构件考虑;由于中、美、欧桥梁规范在确定偏心距增大系数时采用不同的计算方法,且各公式中参数及其取值存在差异,故基于各规范公式计算得到的桥塔各塔肢构件的偏心距增大系数相差较大;由于约束条件不同及长细比的差异,中塔肢规范计算结果均大于有限元计算结果,上、下塔肢按不同规范计算的结果趋势不相同。故进行类似复杂桥塔结构设计时,建议采用有限元方法对桥塔结构的偏心距增大系数进行数值模拟,以排除试验条件对规范公式的影响,规范方法可作为辅助校验手段,以保证桥塔构件配筋设计的合理性。In order to explore the applicability of the specification in calculating the eccentricity magnified coefficient of the spatial diamond-shaped pylon,and ensure the rationality of reinforcement design for pylon of the long-span cable-stayed bridge,the Changtai Yangtze River Bridge was taken as an example,calculates and analyzes the eccentricity magnified coefficients of its pylon.First,the control sections and calculation conditions of the pylon were determined based on the completion state of Changtai Yangtze River Bridge,and the calculating length coefficients in different specifications were compared and studied.Second,eccentricity magnified coefficients of pylon columns were calculated based on finite element analysis and bridge design specifications of China,US,Europe.Last,comparisons between finite element results and specification results were conducted.The results show that since the boundary conditions of the pylon of Changtai Yangtze River Bridge are not clear,there are certain differences between the values of parameter and the actual situation when eccentricity magnified coefficients are calculated using specifications,it is not appropriate to consider the pylons as simple components.Due to the bridge specifications of China,US and Europe adopt different calculation methods in determining the eccentricity magnified coefficient,and the parameters and their values in specification formulas are different,there is a big difference in each column’s eccentricity magnified coefficient calculated based on different specifications.Due to different constraints and different slenderness ratios,the specification results of the middle pylon column are larger than finite element results,the specification results of upper and lower columns calculated according to different specifications have different trends.Therefore,when designing similar complex pylon,it’s recommended to use finite element methods to get the eccentricity magnified coefficient,so as to exclude the influence of test conditions on specification

关 键 词：桥梁工程 计算方法对比 有限元 偏心距增大系数 斜拉桥桥塔 

分 类 号：U442.51[建筑科学—桥梁与隧道工程]