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Fatigue and Ultimate Strengths of Plate Girders Fabricated by Robotics Welding

机器人焊接板梁的疲劳和极限强度

基本信息

批准号：
05452236
负责人：
FUKUMOTO Yuhshi
金额：
$ 2.94万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452236/
关键词：
robotics welding plate girder elastic-plastic large deflection analysis FEM stiffener ultimate strength fatigue strength local stress 弾塑性有限変形解析

项目摘要

The effects of the gap between the end of a horizontal stiffener and a transverse stiffener, so-called horizontal-stiffener-end gap, on the fatigue strength of plate girders was investigated by the gatigue tests of specimens with horizontal stiffeners of different horizontal-stiffener-end gaps. For the life until the crack initiated at the weld toe on the web side of the end return of a horizontal stiffener penetrated the web and appeared on the oppsite surface of the web, the effects of size in horizontal-stiffener-end gaps was small. For the propagation life of a through crack growing vertically in the web, the horizontal-stiffener -end gap of 55 mm was the most effective in the gap size less than 55 mm.The influence of the gap between the end of a transverse stifener and a flange, so-called transverse-stiffener-end gap, on the fatigue strength of the connection of a cross beam to a main girder was examined by the fatigue tests of cross-beam connections with transverse stiffeners of different transverse-stiffener-end gaps. Except for a transverse stiffener welded to a flange, a fatigue crack occurred at the end return of a trnasverse stiffener-web fillet weld, and broke the fillet weld. Except for the transverse stiffener welded to the flange, another crack was caused at the weld toe on the web side of the web-flange fillet weld. The transverse stifferner welded to the flange was the most effective for the fatigue. There was no effect of the increase of the horizontal-stiffener-end gap in the gap size less than 55 mm.The elastic-plastic large deflection analysis of a square plate with a horizontal stiffener under bending was carried out to inverstigate the influence of the horizontal-stiffener-end gap on the ultimate strength of plates. The ultimate strength was almost the same for the horizontal-stiffener-ens gaps between 0 mm and 55 mm, but it rapidly decreases for the gaps between 55 mm and 100 mm.

通过不同水平加筋端缝水平加筋试件的疲劳试验，研究了水平加筋端缝与横向加筋端缝水平加筋端缝对板梁疲劳强度的影响。在水平加筋端部回弹腹板侧焊缝端部开始裂纹穿透腹板并出现在腹板的另一侧之前，水平加筋端部间隙尺寸对裂纹的影响较小。传播生命的成长通过裂纹垂直网络,55毫米的horizontal-stiffener端差距是最有效的间隙尺寸小于55 mm.The影响之间的差距的横向stifener和法兰,所谓transverse-stiffener-end差距,疲劳强度的连接横梁的主梁是由十字梁连接的疲劳试验研究与横向加劲肋形式不同的transverse-stiffener-end缺口。除横向加强筋与法兰焊接外，横向加强筋与腹板的角焊缝在端回处出现疲劳裂纹，导致角焊缝断裂。除横向加强筋与法兰焊接外，腹板法兰角焊缝腹面焊缝脚趾处也存在裂纹。焊接在法兰上的横向加劲板对抗疲劳效果最好。在小于55 mm的间隙范围内，水平加筋端部间隙的增大对板的极限强度没有影响。为了研究水平加筋端部间隙对板的极限强度的影响，对带水平加筋的方形板进行了弯曲弹塑性大挠度分析。在0 ~ 55 mm的水平加筋间隙内，极限强度基本相同，但在55 ~ 100 mm的水平加筋间隙内，极限强度迅速下降。