土-钢共同作用下大跨度波纹钢板管廊结构局部屈曲分析  

LOCAL BUCKLING OF CORRUGATED STEEL PLATE IN LONG-SPAN UTILITY TUNNEL WITH THE INTERACTION OF SOIL-STEEL

作　　者：陈天黎 苏明周[1,2] 王会萌 CHEN Tian-li;SU Ming-zhou;WANG Hui-meng(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education (XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《工程力学》2019年第10期202-211,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51978564);陕西省自然科学基础研究计划项目(2018JM5079)

摘　　要：对于采用深波和大波波形的大跨度波纹钢板综合管廊,其截面平直段在结构整体达到极限承载力之前可能发生局部屈曲。采用Rayleigh-Ritz法对大跨度综合管廊结构中波纹钢板平直段的局部屈曲进行分析。将波纹段考虑为平直段的弹性约束,土体作用考虑为只能承受压力的弹性基底,根据环压理论,得到了钢板平直段在环向均布压力作用下屈曲半波数分别为偶数和奇数时的屈曲荷载理论解。讨论了转动弹簧约束系数对临界屈曲系数的影响,得出非加载边波纹段对平直段的约束作用可视为简支或固支的转动约束系数值;得到了土体弹簧刚度与屈曲荷载间呈线性关系;讨论了板件纵横比与临界屈曲系数间的关系,得到了临界屈曲系数趋于定值时相应的板件纵横比,给出了简化公式。通过有限元值、简化公式值与理论值的对比,证实了简化公式的适用性。最后,根据屈服准则和等稳准则,提出相应的防止大跨径波纹钢板局部屈曲的宽厚比限值的计算公式,可为实际工程提供参考。For the deep and big wave section of a corrugated steel plate(CSP)that is used in a long-span utility tunnel,local buckling may occur in the straight portion of a CSP before the ultimate capacity is reached.The local buckling of the straight portion of CSP is investigated using the Rayleigh-Ritz method.The corrugated portions are assumed to be the elastic rotational restraints of the straight portion,and the soil action is considered as an elastic foundation that can only bear compression.According to the ring compression theory,the local buckling load can be calculated for both the even and odd numbers of the half buckling waves.The influence of the rotational restraint coefficient on critical buckling coefficients is studied,and the supported conditions of corrugated portion are obtained,which can be regarded as simply supported or fully clamped boundary.The relationship between the stiffness of the compression spring for the soil and the buckling load is obtained to be linear.The relationship between the aspect ratio of the straight portion and the critical buckling coefficient is discussed.The corresponding aspect ratio is obtained when the critical buckling coefficient tended to be stable,and the simplified theoretical formulas are derived.With the finite element method analysis,the finite element results,simplified analysis results and theoretical results match well with each other,which validates the simplified derivation.Finally,according to the yield criterion and stability criterion,a reasonable limit value for the width-to-thickness ratio for the straight portion of the CSP are suggested to prevent local buckling of CSP utility tunnel,which can provide a reference for practical applications.

关 键 词：综合管廊 波纹钢板 土-钢作用 局部屈曲 宽厚比限值 

分 类 号：TU391[建筑科学—结构工程]