带悬臂支架半圆形波纹钢管的承载力

Bearing capacity of semi-circular corrugated steel pipe with cantilever supports

波纹钢综合管廊属于新型地下结构,为探讨其中悬臂支架对半圆形波纹钢管承载力的影响,采用有限元方法进行承载力分析,研究了支架位置、荷载形式等参数的影响。分析结果表明,在支架荷载单独作用下,破坏模式为支架连接处的管壁发生弯曲破坏,屈服弯矩取决于支架连接波数和单波受弯能力;在环向压力单独作用下,破坏模式为平面内整体失稳,极限荷载与支架位置无关;在支架荷载和环向压力共同作用下,破坏模式仍为平面内整体失稳,支架荷载和环向压力的相关关系可偏安全地简化为直线。依据分析结果,给出了支架荷载允许值以及波纹钢管稳定承载力的计算方法,可供波纹钢综合管廊设计参考。

Corrugated steel utility tunnel is a novel kind of underground structure.In order to investigate the influence of cantilever supports on the bearing capacity of semi-circular corrugated steel pipes(CSP),the bearing capacity was analyzed using the finite element method,and the influence of parameters such as the support position and load form was discussed.The analysis results show that,the failure mode under the support load is bending failure of the pipe wall at the support connection,and the yield moment depends on the number of connected waves and the bending capacity of a single wave.The failure mode under the circumferential pressure is in-plane global buckling,and the ultimate load has nothing to do with the cantilever support.The failure mode under the support load and the circumferential pressure is still in-plane global buckling,and the correlation between the support load and the circumferential pressure can be conservatively simplified to a straight line.According to the analysis results,the allowable value of the support load and the calculation method of bearing capacity of structural stability were given,which can be used as a reference for design of corrugated steel utility tunnels.