支管受轴向受拉工况下CHS-CFSHS T型节点应力集中系数计算公式

doi:10.13229/j.cnki.jdxbgxb20180737

Abstract

Abstract:

Based on the finite element method of SCF of CHS-CFSHS T-joints with reliable accuracy, 160 finite element models were established to calculate SCF of CHS-CFSHS T-joints when brace is under axial tension which are made up of circular hollow section (CHS) braces and concrete-filled square hollow section (CFSHS) chords. Parameters affecting SCF of the joint were analyzed. In addition, while grasping the influence law of each parameter on SCF, it proposed a calculation formula for SCF when brace is under axial tension, and made a comparison between the calculated value and finite element data. The results show that the six positions of 0°, 60° and 90° on the brace and the chord basically cover the position at which maximum SCF may occur when brace is under axial tension; and quadratic functions of β and 2γ as well as power function of τ should be included in the calculation formula of SCF. Moreover, the influences of the three parameters are coupled with each other, and the regressive calculation formulas of SCF have reliable accuracy.

Key words: structural engineering, fatigue properties, calculation formula of SCF, parameters analysis, CHS-CFSHS welded T-joints, stress concentration factors (SCF)

CLC Number:

TU392.3

De-lei YANG,Le-wei TONG. Calculation formula of SCF for CHS⁃CFSHS welded T⁃joints with brace under axial tension[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(6): 1891-1899.

Figures/Tables 14

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位置	支管/%	主管/%	位置	支管/%	主管/%
0°	0.00	11.25	60°	15.00	17.50
15°	0.00	5.00	75°	2.50	3.75
30°	0.00	5.00	90°	75.75	47.50
45°	6.25	10.00

项目		不区分焊缝类型			角焊缝			全熔透焊缝
项目		B0	B60	B90	C0	C60	C90	C0	C60	C90
公式值/ 有限元值	均值	1.116	1.046	1.039	1.016	1.084	0.988	1.015	0.971	0.949
	方差	0.033	0.023	0.019	0.023	0.064	0.057	0.043	0.071	0.066
	离散度	0.030	0.022	0.018	0.023	0.059	0.057	0.042	0.073	0.070
比值范围	<0.8	2.50%	0.00%	2.50%	5.00%	5.00%	11.25%	10.00%	15.00%	17.50%
	0.8~0.9	6.25%	11.25%	5.00%	8.75%	11.25%	17.50%	11.25%	13.75%	11.25%
	0.9~1.0	21.25%	33.75%	33.75%	36.25%	22.50%	36.25%	23.75%	28.75%	26.25%
	1.0~1.1	35.00%	31.25%	37.50%	33.75%	32.50%	15.00%	31.25%	22.50%	26.25%
	1.1~1.2	18.75%	13.75%	13.75%	12.50%	13.75%	8.75%	15.00%	11.25%	10.00%
	>1.2	16.25%	10.00%	7.50%	3.75%	12.50%	11.25%	8.75%	8.75%	8.75%

Calculation formula of SCF for CHS⁃CFSHS welded T⁃joints with brace under axial tension

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