钢桥规范受压板件局部稳定计算问题探讨  

Discussion on Local Stability Calculation of Compression Plates in Specifications for Steel Bridge

作　　者：杨燎原 YANG Liaoyuan

机构地区：[1]广州市市政工程设计研究总院有限公司,广东广州510060

出　　处：《城市道桥与防洪》2024年第3期72-75,M0008,M0009,共6页Urban Roads Bridges & Flood Control

摘　　要：受压板件局部稳定计算方法是《公路钢结构桥梁设计规范》(JTG D64—2015)中的核心计算方法之一。通过实际设计工程中的应用,并结合一定的理论分析,发现该规范局部稳定计算方法存在以下问题:(1)板元局部稳定折减系数计算公式与宽厚比限制值不协调,宽厚比取上限时折减系数显著小于1;(2)横肋刚柔性判别公式精度不够高,导致在横肋刚柔分界线处加劲板局部稳定折减系数不连续,突变幅度可能较大,且横肋由柔性加强为刚性时折减系数可能反而减小。The local stability calculation method for compression plates is one of core calculation methods in Specifications for Design of Highway Steel Structural Bridge(JTG D64—2015).Through the practical design application and some theoretical analysis,some problems are found in the local stability calculation method in the specification,which are(1)the formula for calculating the reduction coefficient of local stability of the plate element is inconsistent with the limit value of the width to thickness ratio.The reduction coefficient is significantly less than 1 when the upper limit of width/thickness ratio is taken,and(2)the rigid-flexible discrimination formula for the transverse ribs is not accuracy enough,which will result in the discontinuity of the local stability reduction coefficient at the rigid-flexible boundary of the transverse ribs.The mutation amplitude may be large.And the reduction coefficient may decrease when the transverse rib is strengthened from flexible to rigid.

关 键 词：钢桥规范 加劲板 加劲肋 局部稳定 宽厚比 

分 类 号：U442[建筑科学—桥梁与隧道工程]