大跨径跨海斜拉桥组合梁桥面板剪力滞效应  

Shear lag effect of composite beam panel of sea-crossing cable-stayed bridge with large span

作　　者：戚冬艳[1] 于东民[2] 李文华[2] 柳建设[1] 郭红军[1] 

机构地区：[1]西安市政设计研究院有限公司,陕西西安710068 [2]中交第一公路勘察设计研究院有限公司,陕西西安710065

出　　处：《长安大学学报（自然科学版）》2013年第6期68-73,共6页Journal of Chang’an University(Natural Science Edition)

摘　　要：为进一步深化现有的叠合梁剪力滞效应研究理论,以期优化现有的工程设计,通过建立全桥和节段空间有限元模型,分析了某大跨径跨海斜拉桥混凝土桥面板的剪力滞后效应。通过对双工字型钢主梁混凝土桥面板组合梁建立全桥模型,对跨中、塔根、主跨1/4位置等不同部位的应力值进行对比,得出了有效宽度系数分布规律;通过建立节段有限元模型,对不同施工阶段、不同索力、不同汽车工况下有效宽度系数进行分析。研究结果表明:不同桥跨断面处的剪力滞后效应影响不同,跨中截面桥面板剪力滞后效应明显大于塔根处截面;施工阶段的剪力滞效应小,通过修正初等梁理论计算结果即可满足工程要求;索力和汽车荷载对剪力滞效应的影响比较小。研究结论对叠合梁有一定的普遍适用性,为同类桥梁的设计提供参考。For further deepening the research of the existing theory on composite beam shear lag effect so as to optimize the existing engineering design, the shear lag effect of a sea-crossing concrete bridge panel was analyzed through the establishment of the whole bridge and segment space finite element model. By establishing the whole model of double I shaped steel girder and concrete panel composite beam bridge, the stress values of different sections such as the midspan, tower root and 1/4 mainspan were compared and the distribution of effective width coefficients was found out. By establishing segment space finite el ement model, effective width coefficients in different construction conditions, different cable forces or dif ferent vehicle loads were analyzed. The results show that different sections have different influences on shear lag effect, for example, the shear lag effect of the midspan section is bigger than the tower root section. The shear lag effect of construction stage is small, which could be modified from elementary beam theoretic calculation results to meet the engineering requirements. The influence of the cable force and vehicle load on shear lag effect is not great. The conclusion of the study has a certain universal appl- cability for composite beam, which can provide reference for the design of similar bridges. 3 tabs, 8 figs, 11 refs.

关 键 词：桥梁工程 有效宽度系数 桥面板 剪力滞 汽车荷载 

分 类 号：U448.67[建筑科学—桥梁与隧道工程]