单箱多室波形钢腹板组合箱梁内衬混凝土布置方式研究

Study of Lining Concrete Arrangement for Multi-Cell Single Box Composite Girder with Corrugated Steel Webs

为优化波形钢腹板内衬混凝土组合结构受力,以南昌朝阳大桥通航孔桥——单箱多室波形钢腹板单索面多塔斜拉桥为工程背景,通过理论计算和有限元分析研究了单箱多室波形钢腹板组合箱梁内衬混凝土布置形式对结构抗剪性能的影响。结果表明:有无设置内衬混凝土对单箱多室波形钢腹板组合箱梁腹板剪应力水平较高的波形钢腹板影响较大,对腹板剪应力水平较低的波形钢腹板影响较小;内衬混凝土单侧设置和双侧设置波形钢腹板剪应力的影响相差不大;内衬混凝土双侧设置及仅有内衬混凝土无波形钢腹板设置对混凝土剪应力的影响相差较小;对单箱多室波形钢腹板组合箱梁高剪应力水平腹板内衬混凝土可以考虑双侧布置或仅设置混凝土腹板,不设置波形钢腹板;而剪应力水平较低的腹板则考虑设置单侧内衬混凝土。

To optimize the load bearing capacity of the corrugated steel web and lining concrete composite structure,the navigational channel bridge of Nanchang Chaoyang Bridge was taken as the study background.The bridge is a multi-pylon multi-cell single box girder cable-stayed bridge with corrugated steel webs and the stay cables are fanned out in single cable plane.The influence of the arrangement of lining concrete in the multi-cell single box composite girder with corrugated steel webs on the anti-shearing performance of the structure was studied via theoretical calculation and finite element analysis.The results indicate that the addition of lining concrete has significant influence on the corrugated steel webs with higher shearing stress in the multi-cell single box girder with corrugated steel webs,but slight influence on the corrugated steel webs with lower stress level.No matter the lining concrete is added to a single side of the webs or to both the two sides of the webs,the influence exerted on the shearing stress of the corrugated steel webs is basically no difference.There is also no apparent difference observed between the influence of adding lining concrete to both sides of the webs and the influence of only having lining concrete without corrugated steel webs on the shearing stress of the concrete.For the horizontal webs with high shearing stress in the multi-cell single box girder with corrugated steel webs,the lining concrete can be added to both sides of the webs,or considering only installing concrete webs,without corrugated steel webs.Whereas it is proper to add lining concrete to a single side of the webs with lower shearing stress.