空间KK形圆管搭接节点承载力计算公式改进研究  

Improved formula for loading capacity of multiplanar overlapped CHS KK-joints

作　　者：孙建东[1,2] 童乐为[1] 王斌[3] 陈以一[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]山东省建筑科学研究院,山东济南250031 [3]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《建筑结构学报》2013年第2期99-105,共7页Journal of Building Structures

基　　金：山东省博士后创新项目专项资金项目(200902005);山东省中青年科学家奖励基金项目(2009BSB07017)

摘　　要：在揭示国内外现行规范公式和目前研究对于平面内外均搭接的空间KK形节点(KK-Ov形节点)中存在的诸多不足的基础上,对影响节点承载力的因素进行了分析,确定了空间调整系数μKK的主要影响参数,并采用多元非线性回归分析,提出了μKK的函数关系并进行了校验;进而提出了空间KK-Ov形节点的承载力设计值建议式,并与试验数据和有限元分析数据比较,以及与现有规范公式横向比较评价。结果表明:建立在空间圆管KK形间隙试验节点基础上的现有规范公式不适于计算4根腹杆交错搭接的空间圆管KK-Ov形节点;空间调整系数μKK的主要影响参数为弦杆的径厚比γ和平面外两腹杆搭接率ζt,回归的函数表达式可以较好地反映空间参数变化对节点承载力的影响;提出的建议式为在平面K形节点承载力基础上乘以μKK,公式具有较高精度和可靠性,可以用于空间KK-Ov形圆管节点的承载力设计。This paper reveals the deficiency of the formula for multiplanar overlapped CHS KK-joints both in plane and out of plane（multiplanar KK-Ov joint） in the existing specifications and documents,and carries out parametric analysis on multiplanar KK-Ov joints.The main influencing parameters of multiplanar-effects coefficient μKK were determined.By means of multiple nonlinear regression analysis,the function of multiplanar-effects coefficient μKK was proposed and validated.Then,an improved design formula for CHS KK-Ov joints was recommended and compared with the test and FEA data and with the formulae in existing design specifications.The conclusions can be drawn that the formula established by test database for multiplanar gapped CHS KK-joint is not suitable to predict the ultimate capacity of CHS KK-Ov joints with four mutually overlapped braces;the expression of the functional relation between μKK and it＇s main influence parameters γ（ratio of chord diameter to twice wall thickness）,ζt（ratio of transverse gap length to diametor） can correctly reflect the effect of spatial geometric parameters on ultimate capacity;the formula proposed in the paper,which is more concise and practical,has a higher degree of accuracy and reliability to the design of multiplanar KK-Ov joints.

关 键 词：空间圆管KK形节点 有限元分析 空间调整系数 非线性回归 承载力 设计公式 

分 类 号：TU392.3[建筑科学—结构工程]