设置加劲肋圆钢管T型相贯节点面内抗弯承载力试验研究及模拟分析  

EXPERIMENTAL RESEARCH AND SIMULATION ANALYSIS ON IN-PLANE FLEXURAL BEARING CAPACITY OF CIRCULAR STEEL TUBULAR T-JOINT WITH STIFFENING RIBS

作　　者：李晨[1] 张大长[2] 李布辉[2] LI Chen;ZHANG Dachang;LI Buhui(Architectural Engineering Institute,Yangzhou Polytechnic Institute,Yangzhou 225000,China;College of Civil Engineering,Nanjing Tech University,Nanjing 210018,China)

机构地区：[1]扬州工业职业技术学院,江苏扬州225000 [2]南京工业大学土木工程学院,南京210018

出　　处：《工业建筑》2018年第7期135-139,159,共6页Industrial Construction

基　　金：江苏省2013年“六大人才高峰”项目

摘　　要：为提高相贯节点的承载力和疲劳寿命,在节点区域设置加劲肋,开展设置加劲肋T型圆钢管相贯节点面内抗弯承载力的试验研究,探讨了设置加劲肋T型相贯节点的破坏模式、应变发展规律和抗弯承载力特性;试验中主管受压侧加劲肋附近应变发展较快,当节点荷载临近极限承载力时,节点主管受压侧加劲肋附近发生明显凹陷的局部屈曲,同时加劲肋发生面外弯曲失稳;设置加劲肋节点面内抗弯承载力比无加劲肋节点承载力明显提高,说明设置加劲肋后有效提高了节点抵抗变形的能力,增加了节点的刚度和强度,使节点承载力有大幅度的提升。同时,开展相贯节点的非线性有限元模拟,分析得到节点的失效模式、承载力与试验均吻合较好。基于非线性有限元模拟,考察加劲肋布置方式对抗弯承载力的影响,提出了合理的加劲肋布置方式。In order to improve the bearing capacity and fatigue life of tubular joints,stiffening ribs were installed in the joints,experimental studies on the in-plane flexural bearing capacity of steel tubular T-joint with stiffening ribs were carried out,and the flexural bearing characteristics,failure mode and strain development law of steel tubular Tjoint were investigated. The results showed that the strain near the pressure side of the stiffened ribs of the main tube was developing rapidly. When the load on the joint was closed to the ultimate bearing capacity,the significant local buckling occurred near the stiffeners on the pressure side of the main tube. At the same time the out-plane bending instability occurred on stiffening rib. The in-plane flexural bearing capacity significantly increased after setting the stiffening ribs,which showed that the stiffening ribs could effectively increase the deformation-resistant capacity of the joints,and increase the stiffness and strength,so as to greatly improve the bearing capacity of the joints. The failure modes and bearing capacity of steel tubular T-joint with stiffening ribs were obtained through the finite element analysis,and it showed a good agreement with test data. The effect of arrangement of stiffening ribs on the in-plane flexural bearing capacity was studied based on the nonlinear finite element simulation,and a rational layout scheme was proposed.

关 键 词：加劲肋 T型相贯节点 局部屈曲 平面内抗弯承载力 

分 类 号：TU392.3[建筑科学—结构工程]