摘要
对微观机制模型之空穴扩张模型(VGM)在预测圆钢管T型相贯节点极限承载力中的应用进行了分析,考虑了焊缝以及支管径厚比Ψ对VGM判据的影响。结果显示:在未考虑焊缝建模时,Ψ的范围在10.0到12.5之间,鞍点位置达到VGM判据,当Ψ逐渐超过12.5时,鞍点位置越来越达不到判据要求;在考虑焊缝建模时,由于等效塑性应变在鞍点位置不增长,不能达到VGM判据,当未达到判据时,可以考虑将主管塑性变形的1.25%作为该节点的极限承载力。通过VGM判据结果得出当参数Ψ逐渐增大时,圆钢管T型相贯节点极限承载力是逐渐降低的;分析结果发现,支管径厚比Ψ几乎不影响节点的荷载位移曲线。
The microscopic mechanism model(VGM)in the prediction of round steel tube T-joints,the application of ultimate bearing capacity is analyzed,considering the weld and the pipe diameter-thickness ratioΨaffect VGM criterion.Results show that,when the weld detail unconsidered,Ψrange from 10.0 to 12.5,saddle point location to VGM criterion,whenΨgradually over 12.5,saddle point position,the more cannot meet the criteria requirements;When considering the welding seam modeling,the VGM criterion cannot be reached because the equivalent plastic strain does not increase at the saddle point.When the criterion is not reached,1.25%of the main plastic deformation can be considered as the ultimate bearing capacity of this node.Through VGM criterion results when parameterΨincrease gradually,round steel tube T-joints ultimate bearing capacity is gradually reduce;The results found that the diameter-thickness ratioΨalmost does not affect the load-displacement curve.
作者
石小龙
黄政华
夏义舒
SHI Xiaolong;HUANG Zhenghua;XIA Yishu(School of Civil Engineering,Guizhou University,Guiyang 550025,China)
出处
《四川建筑科学研究》
2019年第6期25-29,共5页
Sichuan Building Science
基金
贵州省科技计划项目(黔科合基础[2018]1036,黔科合LH字[2017]7257号)
贵州大学2017年度学术新苗培养及创新探索专项(黔科合平台人才[2017]5788)
关键词
微观机制模型
焊缝建模
径厚比
极限承载力
micro-mechanical model
weld modeling
diameter-thickness ratio
ultimate bearing capacity
