论文部分内容阅读
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。
In order to further deepen the existing research theory of shear lag effect of composite beams, in order to optimize the existing engineering design, through the establishment of full-bridge and segment space finite element model, the analysis of a large span cable- Shear Lag Effect. By setting up a full-bridge model for the double girder bridge girder concrete bridge deck composite beam, the stress values at different positions such as mid-span, tower root and main span at ¼ position are compared and the effective width coefficient distribution is obtained. The finite element model of section is established to analyze the effective width coefficient under different construction stages, different cable forces and different vehicle conditions. The results show that the influence of shear lag effect is different at different bridge cross-sections, and the shear lag effect of bridge deck is obviously greater than that of tower root section. The shear lag effect of the construction phase is small. By calculating the primary beam theory, Can meet the engineering requirements; cable load and the impact of vehicle load on shear lag effect is relatively small. The conclusions of the study have some general applicability to the composite beam, which provides a reference for the design of similar bridges.