负载下高强螺栓加固H型钢轴压构件有限元分析  

FINTTE EI EMENT ANALYSIS OF H-BEAM ANIAL COMPRESSION MEMBERS REINEORCED WITH HIGH STRENGTH BOLTS UNDER LOAD

作　　者：李劲男 李尚飞 杜金 王金泽 刘丙友 LI Jin-nan;LI Shang-fei;DU Jin;WANG Jin-ze;LIU Bing-you(Hebei Academy of Building Research Co.,Ltd.,050000,Shijiazhuang,China;Hebei Jianyan Architectural Design Co.,Ltd.,Architectural Renewal(Luquan)Branch,050000,Shijiazhuang,China;Hebei Province Existing Building Comprehensive Transformation Technology Innovation Center,050000,Shijiazhuang,China;Chang'an University,710061,Xi'an,China)

机构地区：[1]河北省建筑科学研究院有限公司,石家庄050000 [2]河北建研建筑设计有限公司建筑更新(鹿泉)分公司,石家庄050000 [3]河北省既有建筑综合改造技术创新中心,石家庄050000 [4]长安大学,西安710000

出　　处：《建筑技术》2024年第24期3051-3056,共6页Architecture Technology

基　　金：中央引导地方科技发展资金项目(236Z4506G)。

摘　　要：为研究负载状态下高强螺栓连接加固十字形钢柱的力学性能,建立了2种不同失稳模态加固构件的有限元模型。通过ABAQUS有限元模拟,并考虑结构构件的残余应力以及初始几何变形的因素,确定合理的螺栓间距,对不同的初始应力以及长细比状态下的加固构件极限承载能力进行了分析。结果表明:当螺栓间距与柱长之比达到1/10时,高强螺栓能够起到很好的连接效果;随着初始应力比以及长细比增大,加固构件的极限承载能力逐渐降低,对承载能力产生不利的影响;承载能力减折系数会随初始应力的增大而减小,但随着长细比的增大在一定范围内呈上升趋势,这表明长细比会影响加固构件的刚度;推导出初始应力比、长细比以及承载能力折减系数的函数关系式,可为未来加固构件的计算提供参考。To study the mechanical properties of cruciform steel columns reinforced with high-strength bolted connections under load conditions,finite element models of reinforced members with two different modes of instability were established.Through abaqus finite element simulation and considering the residual stresses and initial geometric deformation of the structural members,a reasonable bolt spacing is determined to analyse the effects of different initial stresses and length-to-finish ratios on the ultimate load carrying capacity of the reinforced members.The results show that:when the ratio of the bolt spacing to the column length reaches 1/10,the high strength bolts can play a good connection effect;with the increase of the initial stress ratio and the length and slenderness ratio,the ultimate load carrying capacity of the reinforced member gradually decreases,which has an unfavourable effect on the load carrying capacity;the load carrying capacity reduction coefficient decreases with the increase of the initial stress,but increases with the increase of the length and slenderness ratio,which indicates that the length and slenderness ratio will have an effect on the stiffness of the reinforced member;and the load carrying capacity reduction coefficient decreases with the increase of the initial stress,but increases with the increase of the length and slenderness ratio.The initial stress ratio,length-to-finish ratio and load capacity reduction coefficient are derived,which can be used as a reference for the calculation of future reinforced members.

关 键 词：数值模拟 钢结构 负载加固 轴心受压 受力性能 

分 类 号：TU391[建筑科学—结构工程]