超宽大纵坡V型刚构桥悬臂施工受力安全分析  

Stress Safety Analysis of Cantilever Construction of V-Type Rigid Frame Bridge with Ultra-Wide and Large Longitudinal Slope

作　　者：崔建伟 傅中秋[1] 李心诚 刘锋 Cui Jianwei;Fu Zhongqiu;Li Xincheng;Liu Feng(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;The 24th Bureau Group Co.Ltd.of China Railway,Shanghai 200071,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]中铁二十四局集团有限公司,上海200071

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第3期30-35,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：以某现浇混凝土超宽大纵坡V型墩刚构桥为背景,建立全桥及挂篮有限元模型。提取主梁悬臂端及V墩固结区域应力,并将纵坡两侧的应力进行对比,分析悬臂施工中的V型刚构桥受力特征以及大纵坡的影响。研究表明,距离挂篮前支点约70 cm处的主桁架下方顶板存在应力集中,建议同类型桥梁悬臂施工时重点关注主桁架前支点向跨中方向1 m范围内的应力。V墩与主梁固结区域在位于主梁腹板下方的位置出现应力集中,建议V墩设计时提高该部位的局部配筋率。V墩斜腿随悬臂伸长发生了应力重分布,最不利位置为斜腿上部外侧角点,施工中应严格监控。大纵坡提高了纵坡低侧的主梁悬臂端应力,对V墩的影响可忽略不计。Based on a cast-in-place concrete V-shaped pier rigid frame bridge with ultra-wide and large longitudinal slope,the finite element model of the whole bridge and the hanging basket was established.The stress of the cantilever end of the main beam and the consolidation area of the V pier were extracted,and the stress on both sides of the longitudinal slope was compared.The stress characteristics of the V-type rigid frame bridge in cantilever construction and the influence of large longitudinal slope were analyzed.The research shows that there is stress concentration in the roof below the main truss at about 70 cm from the front fulcrum of the hanging basket.It is suggested that the stress in the range of 1 m from the front fulcrum of the main truss to the middle of the span should be focused on in the cantilever construction of the same type of bridge.The stress concentration occurs in the consolidation area of the V pier and the main beam at the position below the main beam web.It is suggested that the local reinforcement ratio of this position should be increased in the design of the V pier.The stress redistribution of the inclined leg of V pier occurs with the cantilever extension,and the most unfavorable position is the upper lateral corner of the inclined leg so the construction should be strictly monitored.The large longitudinal slope increases the cantilever end stress of the main beam at the low side of the longitudinal slope,and the influence on the V pier is negligible.

关 键 词：超宽桥面 大纵坡 V型刚构桥 悬臂施工 受力分析 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]