摘要
钢管宽厚比是限制矩形钢管混凝土构件截面设计的主要因素,为增加钢管宽厚比限值,延缓管壁局部屈曲,可在管壁上设置纵向加劲肋.加劲肋的肋数及尺寸显著影响钢管的承载力及管内混凝土的整体性能.论文建立设纵肋矩形钢管混凝土轴压柱的屈曲分析模型,将问题转化为求解均布荷载作用下加载边和非加载板均为固支边界的设纵肋薄板的屈曲荷载,采用能量法推导出构件屈曲荷载及屈曲系数的解析表达式.根据被加劲板的屈曲模式,提出采用最小加劲刚度比进行矩形钢管混凝土轴压构件加劲肋的设计,并给出相应的计算公式,为加劲肋的肋数、截面尺寸及材料性能设计提供指导.
Width-thickness ratio was an important parameter for designing CFRST.Welding longitudinal stiffener on the internal wall of steel pipe could delay the local buckling,which increased the limit of width-thickness ratio.If the stiffener were not enough and its sectional dimension was too small,the local buckling of steel pipe occurred,which induced its bearing capacity seriously.If the stiffener sectional dimension is too large,concrete filled in steel tube would be broken up,which reduced bearing capacity.To solve that problem,this paper studied on local buckling of CFRST with longitudinal stiffener under axial compression and design of longitudinal stiffener.It established buckling analysis model,simplified local buckling analysis as calculating buckling load of thin plate clamped on loading side and unloading side under axial force.It deduced buckling load and buckling coefficient based on the principle of energy.The results showed that buckling mode depended on stiffening rigidity.Therefore,it put forward minimum stiffening rigidity ratio that controlled the stiffener design.This paper also came up with a formula to calculate minimum stiffening rigidity ratio.It provided guidance on designing number,sectional dimension and material performance.
作者
程高
刘永健
张宁
李慧
CHENG Gao;LIU Yongjian;ZAHNG Ning;LI Hui(School of Highway,Chang′an University,Xi′an 710064,China;College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Key Laboratory for Highway Bridge and Tunnel of Shaanxi Province,Chang′an University,Xi′an 710064,China)
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2018年第4期513-519,共7页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金项目(51378068
51778058)
陕西省自然科学基金项目(2018JQ5219)
青海省交通科技项目(2017-咨13)
关键词
钢管混凝土
矩形
纵肋
屈曲性能
解析分析
设计
concrete-filled steel tube
rectangular
longitudinal stiffener
local buckling
analytical solution
design
