钢管混凝土桁架K型管节点的热点应力集中系数探究  

A Study on Hot Spot Stress Concentration Factors of K-Type Tubular Joints for Concrete-Filled Steel Tube Truss

作　　者：廖平 朱海峰 彭颖 黄身勇 林文聪 LIAO Ping;ZHU Haifeng;PENG Ying;HUANG Shenyong;LIN Wencong(School of Civil Engineering,Putian University,Putian Fujian 351100,China;Fujian Yongtai Construction Engineering Company,Fuzhou Fujian 350700,China;Fujian Nanyu Engineering Construction Limited Company,Sanming Fujian 365000,China)

机构地区：[1]莆田学院土木工程学院,福建莆田351100 [2]福建省永泰建筑工程公司,福建福州350700 [3]福建省南禹工程建设有限公司,福建三明365000

出　　处：《莆田学院学报》2023年第2期74-78,83,共6页Journal of putian University

基　　金：福建省自然科学基金资助项目(2021J05239);福建省中青年教师教育科研项目(科技类)(JAT200516,JAT200525);莆田学院科研创新专项项目(2021ZP03);莆田学院引进人才科研启动项目(2018075)。

摘　　要：为研究钢管混凝土桁架焊缝附近的应力场分布特征及焊趾处热点应力集中系数,以主钢管内填充混凝土的K型管节点为研究对象,建立了考虑主钢管与混凝土表面非线性接触行为的三维实体有限元计算模型,探究了焊趾处热点应力集中系数的分布规律。研究结果表明:1)主钢管与支钢管焊缝附近区域节点的第一主应力在冠趾处达到最大值;2)热点应力集中系数在鞍点附近节点达到最小值,而在冠趾与鞍点之间的中点或附近节点处达到最大值;3)采用两点外推法和三点外推法计算钢管混凝土桁架K型管节点的热点应力集中系数均是可行的,并且二者差异较小。In order to explore stress field distribution characteristics near the weld and hot spot stress concentration factors of the weld toe for concrete-filled steel tubular truss,K-type tubular joints with concrete-filled main steel tubular are studied in this paper.One three-dimensional solid finite element computational model considering the nonlinear contact behavior of main steel tubular and concrete surface is established.The distribution rule of hot spot stress concentration factors of each joint of the weld toe was explored.The results show that:1)the first principal stress of the nodes near the weld between the main steel pipe and the steel branch pipe reach the maximum at its crown toe;2)the hot spot stress concentration factors of the corresponding node near the saddle point reach the minimum value,and it appeared the maximum value at or near the midpoint between the crown toe and the saddle point;3)two-point extrapolation and three-point extrapolation both prove feasible to calculate the corresponding hot spot stress concentration factors of K-type tubular joints of concrete-filled steel tubular truss,and the difference between the two methods is very small.

关 键 词：钢管混凝土桁架 K型管节点 热点应力集中系数 两点外推法 三点外推法 

分 类 号：TU375[建筑科学—结构工程]