Experimental study on yield capacity of inner-outer flange connections under axial tension load

被引：0

作者：

Chen Y. ^{[1
]}

Mou W. ^{[1
,2
]}

Guo Y. ^{[2
]}

Shen G. ^{[1
]}

Wang J. ^{[1
]}

Li Y. ^{[1
]}

机构：

[1] College of Civil Engineering and Architecture, Zhejiang University, Hangzhou

[2] China Energy Engineering Group, Zhejiang Electric Power Design Institute Co.,Ltd., Hangzhou

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 06期

关键词：

axial tension; finite element analysis; inner-outer flange connection; mechanical characteristic; static test;

D O I：

10.14006/j.jzjgxb.2022.0187

中图分类号：

学科分类号：

摘要：

To provide calculation method for the yield capacity of the inner-outer flanges of the super-high tubular transmission towers, and to study the distribution of bolt forces of these flanges under axial tension load, ten specimens with various parameters were employed in the experimental study. Using experimentally validated finite element models, parametric sensitivity analysis with focus on the ratio of the outer bolt force to the inner bolt force was then performed. Finally, a theoretical formula for calculating the ratio was proposed, based on assumption that the inner-outer flange was equivalent to a beam rotationally constrained by two springs at one end. The experimental results show that the internal tension forces of the inner bolts are not equal to those of the outer bolts, and the yield capacity of the inner-outer flange is less than the sum of the forces of the inner and the outer bolts. The inner bolt force to outer bolt force ratio of the inner-outer flange is constant in the elastic stage, whereas the inner and the outer bolt forces become close to each other in the elastoplastic stage with the increase of the external loading. Both the parametric sensitivity analysis and the experimental results indicate that the ratio increases monotonically with increasing bolt position, bolt number, diameter to thickness ratio of tube, and thickness of flange plate. Since the conventional calculation method doesn’t consider the inequality between internal bolt force and outer bolt force, the flange’s yield capacity is actually less than the yield capacity computed via the conventional method, and the ratio of the yield capacities has a minimum value of 0.8. The theoretical calculation formula for the inner bolt force to outer bolt force ratio is capable of explaining the variation of the ratio with the parameters, from which the obtained results agree well with that obtained from tests and finite element analysis. An equation for predicting the yield capacity was proposed based on the analysis of the FEA results of 62382 inner-outer flanges. Regarding yield capacity, the ratios of FEA result to theoretical result have a mean value closed to 1.0, and the coefficient of variation of the ratios is 1.3%. It is shown that the theoretical calculation formula can be applied to the inner-outer flanges for the connection of the steel tubes with diameter to thickness ratio of 40-100. © 2023 Science Press. All rights reserved.

引用

页码：199 / 211

页数：12

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