PBL加劲型矩形钢管混凝土支管受拉节点有效分布宽度  

Effective Distribution Width of Tension Joints in Brace of Rectangular Concrete-filled Steel Tube Stiffened with PBL

作　　者：侯蓓蓓[1] 刘永健[1] 姜磊[1,2] 张国靖 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]皇后大学土木工程系,安大略金斯顿K7L3N6

出　　处：《建筑科学与工程学报》2017年第6期116-126,共11页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51378068)

摘　　要：为研究PBL加劲型矩形钢管混凝土支管受拉节点应力分布规律及其有效分布宽度,采用ABAQUS软件建立42个矩形空钢管、钢管混凝土及PBL加劲型矩形钢管混凝土节点有限元模型并进行位移加载;根据有限元计算结果拟合得到矩形空钢管、钢管混凝土及PBL加劲型矩形钢管混凝土节点的有效分布宽度表达式,将拟合公式计算值与CIDECT规范计算值和有限元计算值进行对比。结果表明:在节点受力全过程中,PBL加劲型矩形钢管混凝土节点相对于矩形空钢管节点和钢管混凝土节点的应力分布不均匀性减小;当加载位移达到3%b0(b0为主管宽度)时,PBL加劲型节点的有效分布宽度更大,具有更好的受力性能,支板应力分布效率ξ随主管宽厚比2γ与支主管厚度比τ的增大而减小,其中τ对ξ的影响更大;支板应力分布效率ξ随支主管宽度比β变化较小,且呈抛物线变化;拟合公式计算值与CIDECT规范计算值及有限元计算值吻合良好,验证了公式的正确性。In order to research the stress distribution and the effective distribution width of tension joints in the brace of rectangular concrete-filled steel tube stiffened with PBL,42 finite element models of joints of rectangular hollow tube,concrete-filled steel tube and PBL stiffened concrete-filled steel tube were established by ABAQUS software,and the displacement loading was carried out.According to the results of finite element calculation,the expressions of effective distribution width of rectangular hollow tube,concrete-filled steel tube and PBL stiffened concrete-filled steel tubular joints were obtained.The results show that the stress distribution inhomogeneity of PBL stiffened concrete-filled steel tubular joint is lower than that of hollow tube and concrete-filled tubular joints during the whole stressing process of joint.When the load displacement reaches 3%b0（b0 is width of chord）,the effective distribution width of PBL stiffenedjoint is greater and it has better mechanical performance,and the stress distribution efficiencyξof branch plate decreases with the increase of the width to thickness ratio 2γ of chord and the thickness ratioτof brace to chord,and the effect ofτonξis more significant.The stress distribution efficiencyξof support plate varies little with the width ratioβof brace to chord,and it shows quadratic parabola regularity.The calculated values of the fitted formula are in good agreement with the calculated values of CIDECT code and finite element method,and the correctness of the formula is verified.

关 键 词：PBL加劲型矩形钢管混凝土节点 有效分布宽度 应力分布 受力全过程 节点承载力 

分 类 号：TU375[建筑科学—结构工程]