沌口长江公路大桥加劲梁选型与设计

发布时间：2018-08-19 15:03

【摘要】：沌口长江公路大桥主桥为(100+275+760+275+100)m双塔双索面半飘浮体系斜拉桥。针对该桥车道数较多、通行重载货车比例高的特点,提出整幅式P-K断面钢箱梁、双层钢桁梁以及分幅式钢箱梁3种加劲梁方案,采用有限元软件分析各方案静动力性能,综合考虑各方案静动力性能、景观效果、造价等,确定该桥选用整幅式P-K断面钢箱梁方案。该方案钢箱梁由2个流线型扁平边箱、箱间顶板及横隔板组成,宽46.0m,中心线处梁高4.0m,横隔板采用整体式(标准间距3.0m);剪力滞和横向偏载效应导致的截面应力不均匀及局部应力增大,通过分段调整钢箱梁板厚以及加强局部构造,使钢箱梁应力在容许范围内;针对大跨重载的特点,采用了疲劳细节等级较高的构造细节,加强了桥面板与加劲肋的焊缝设计,提高了钢箱梁正交异性钢桥面板的疲劳强度。
[Abstract]:The main bridge of Zhuankou Yangtze River Highway Bridge is (100 275 760 275 100) m double tower and double cable plane semi-floating cable-stayed bridge. In view of the large number of lanes and the high proportion of heavy truck, three kinds of stiffening beam schemes are put forward, that is, whole P-K section steel box girder, double-deck steel truss beam and split-type steel box girder. The static and dynamic performance of each scheme is analyzed by finite element software. Considering the static and dynamic performance, landscape effect and cost of each scheme, it is determined that the whole P-K section steel box girder scheme is selected for the bridge. The steel box girder is composed of two streamlined flat side boxes, the roof between the boxes and the transverse divisions. The width is 46.0 m, the beam height at the center line is 4.0 m, the transverse partition is integrated (standard spacing is 3.0 m), the cross-section stress caused by shear lag and transverse eccentric load effect is uneven and the local stress is increased, the thickness of steel box girder plate is adjusted by section and the local structure is strengthened. According to the characteristics of long span heavy load, the structural details with high fatigue detail grade are adopted to strengthen the weld design of bridge deck and stiffened rib, and the fatigue strength of orthotropic steel bridge face slab is improved.
【作者单位】：中交第二公路勘察设计研究院有限公司;
【分类号】：U448.27

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