JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING
2096-6717
article
受压T肋加劲板翼缘局部稳定试验与计算方法
Local stability test and calculation method of flange of T-rib stiffened plate under compression
为研究T形肋加劲板翼缘的受压局部稳定性能，考虑翼缘宽厚比的变化，设计制作了5个Q345钢材强度和4个Q420钢材强度的焊接T形肋加劲板试件进行翼缘局部稳定轴压试验，并建立了有限元模型进行验证，分析了不同材料本构、简化焊接残余应力、局部初始几何缺陷对其受力性能的影响，得到了翼缘局部稳定简化计算公式，并与各国规范稳定曲线进行对比。结果表明：翼缘局部稳定试件的试验与有限元模型均在翼缘1/2高度附近发生局部屈曲破坏，翼缘宽厚比越大，试件越早出现局部屈曲变形。有限元计算模型采用理想弹塑性本构模型模拟，随着翼缘相对宽厚比增加，残余应力的计入降低了构件轴向刚度，当翼缘宽厚比为30时，稳定系数减小5.4%；所有板件均计入局部初始缺陷时的稳定系数最小。采用三次多项式拟合的翼缘局部稳定简化公式曲线与欧洲规范曲线的趋势较为接近，而采用 Perry公式拟合的曲线与中国、美国规范曲线的趋势较为接近。不同钢材强度拟合的公式曲线趋势基本一致，可以偏安全采用perry公式拟合的曲线进行计算。
In order to study the flange local stability of T-rib stiffened plates under compression, considering the variation of flange width thickness ratio, T-rib stiffened plates with Q345 strength (5 pieces) and Q420 strength (4 pieces) were fabricated to carry out the local stability axial compression test, and the finite element models were established to verify the test. The influence of different material constitutions, simplified welding residual stress and local initial geometric imperfections on the mechanical properties of the flange were analyzed. The simplified calculation formula for the local stability of the flange was obtained and compared with the standard stability curves of various countries. The results show that both the test and the finite element model of the locally stabilized specimen have local buckling failure near the flange height of 1/2, and the larger the flange width-thickness ratio is, the earlier the specimen has local buckling failure. The finite element models are simulated by an ideal elastic-plastic constitutive model. With the increase of the relative flange width-thickness ratio, the residual stress reduces the axial stiffness of the specimen. The stability coefficient decreases by 5.4% when the flange width-thickness ratio is 30. The coefficient of stability is smallest when local initial imperfections are included. The curve of the simplified formula for the the flange local stability fitted by cubic polynomial is close to the trend of the Eurocode curve, while the curve fitted by Perry formula is close to the trend of the Chinese and American standard curve. The trend of formula curves fitted with different steel strength is basically the same, which can be calculated by Perry formula for a safer rusult.
T形肋加劲板;翼缘;局部稳定试验;数值模拟;计算方法;残余应力;初始几何缺陷
T rib-stiffened plate; Flange; Local stability test; Numerical simulation; Calculation method; Residual stress; Local initial geometric imperfection
赵 秋,陈 鹏,林 楚,陈友杰
ZHAO Qiu,CHEN Peng,LIN Chu,CHEN Youjie
1.福州大学 土木工程学院;2.福州市城乡建总集团有限公司
1.School of Civil Engineering,Fuzhou University;2.Fuzhou Urban RuralSConstructionSGeneral
cqdxxbcn/article/abstract/tm-202102049