钢框架腹板开孔型节点脆性断裂分析  

Numerical Analysis of Brittle Fracture for Steel Nodes of Web of Beam with Circular Aperture

作　　者：孙玉萍[1] 吴国栋[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《甘肃科学学报》2012年第4期81-84,共4页Journal of Gansu Sciences

摘　　要：焊缝裂纹是断裂问题分析中一个重要组成部分,其中对带裂纹的新型钢节点分析是近几年的趋势.针对梁腹板开圆孔的节点形式,利用J积分理论,模拟了焊缝裂纹尖端的应力应变场.分析结果表明:裂纹尖端处的J积分在一定范围内与圆孔直径D成正比,与梁弱轴的回转半径成正比,然而与圆孔中心至柱翼缘的距离d无关.此外,方钢柱节点的承载能力和局部稳定性明显优于工字钢柱节点.The welding crack is one of the important parts of fracture analysis.To analyze new type steel nodes with cracks is a recent tendency.According to the web of beam with circular aperture of nodes,J-integral theory is used;the stress and strain field around the crack tip is imitated.The analytic results show that J-integral around the crack tip is respectively in direct proportion to the diameter of circular aperture and the radius of gyration of beam weak axis with special range.However,the distance between the circular aperture center and the flange of column makes no difference to J-integral around the crack tip.In addition,the bearing capacity and the local stability of nodes of square steel column are better than those of nodes of Ⅰ-steel column.

关 键 词：J积分 焊缝裂纹尖端 梁腹板开圆孔 脆断性能 

分 类 号：TU391[建筑科学—结构工程]