Mechanical Properties of Doubler or Vertical Inner Plates Reinforced Square Tubular T-Joints Under In-Plane Bending

WEN Zhihong; LI Zhaowei; WEI Haifeng; LONG Bangyun

doi:10.3724/j.gyjzG22071402

Volume 55 Issue 2

Feb. 2025

Turn off MathJax

Article Contents

Abstract

References

Article Navigation > INDUSTRIAL CONSTRUCTION > 2025 > 55(2): 130-137

WEN Zhihong, LI Zhaowei, WEI Haifeng, LONG Bangyun. Mechanical Properties of Doubler or Vertical Inner Plates Reinforced Square Tubular T-Joints Under In-Plane Bending[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 130-137. doi: 10.3724/j.gyjzG22071402

Citation:

WEN Zhihong, LI Zhaowei, WEI Haifeng, LONG Bangyun. Mechanical Properties of Doubler or Vertical Inner Plates Reinforced Square Tubular T-Joints Under In-Plane Bending[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(2): 130-137. doi: 10.3724/j.gyjzG22071402

Citation:

PDF( 15734 KB)

Mechanical Properties of Doubler or Vertical Inner Plates Reinforced Square Tubular T-Joints Under In-Plane Bending

doi: 10.3724/j.gyjzG22071402

1. CCCC Fourth Highway Engineering Co., Ltd., Beijing 100020, China;
2. JiangSu Key Lab of Environmental Impact and Structural Safty in Eng, China Univ of Mining & Technol, Xuzhou 221116, China

Received Date: 2022-07-14
Available Online: 2025-04-02

Abstract

Abstract

In order to study the in-plane bending performance of doubler-plate reinforced (DPR) or vertical inner plate reinforced (IPR) square tubular T-joints, experimental tests and numerical simulations were carried out on unreinforced and DPR or IPR joints with the brace to chord width ratio of 0.8, as well as an equal width joint for comparison. The failure modes, moment-strain curves and moment-rotation curves of the specimens were analyzed. The finite element models of the joints with different β(0.4,0.6 and 0.8) were established and the bearing mechanism of the reinforced joints was discussed. The experimental results showed the flexural capacity of DPR joints and IPR joints was significantly improved comparing to the unreinforced ones, the flexural strength and the initial stiffness impoved by 71% and 123%, compared with the unreinforced joints. The vertical inner plate was effective to protect the weld between the chord and the brace, and transfered the failure from the cracks of the weld to the yielding of the brace. The doubler-plate could protect the chord flange and change the failure mode from chord flange yield to doubler-plate yield. The reinforced joints had better ductility than the equal width joint, yet demonstrated a lower flexural strength and stiffness. Further mechanism analysis from the finite element results indicated that the doubler-plate improved the flexural strength of the joint by increasing the local stiffness of the chord flange on the compressive side. The vertical inner plate improved the flexural stiffness at the intersection zone and protected the welds between the chord and the brace, thus enhancing the flexural strength of the joint.
- square tubular,
- doubler-plate reinforced joint,
- vertical inner plate reinforced joint,
- in-plane bending,
- experimental research,
- finite element

FullText(HTML)

References(25)

References

[1]	WARDENIER J. Hollow sections in structural application[M]. The Netherlands: Bouwen Met Staal, 2002: 98-107.
[2]	王旭东, 黄政华,韩涵. X型圆钢管相贯节点超低周疲劳裂纹萌生寿命预测[J]. 工业建筑, 2022,52(5): 83-89 ,225.
[3]	白杨,祝磊,王喆.槽钢加强T形圆钢管节点的轴向承载性能研究[J].工业建筑,2022,52(4):56-61.
[4]	CHEN Y, HU Z H, GUO Y, et al. Ultimate bearing capacity of CHS X-joints stiffened with external ring stiffeners and gusset plates subjected to brace compression[J]. Engineering Structures, 2019, 181: 76-88.
[5]	常鸿飞,夏军武,罗梓,等. 覆板加强的方钢管T形节点轴向滞回性能试验研究[J]. 建筑结构学报, 2017, 38(5): 20-26.
[6]	OZYURT E, DAS S. Experimental and numerical studies on axially loaded reinforced square hollow section T-joints[J]. Engineering Structures, 2019, 192: 323-334.
[7]	CHOO Y S, VAN DER VEGTE G J, ZETTLEMOYER N, et al. Static strength of T-joints reinforced with doubler or collar plates. I: experimental investigations[J]. Journal of Structural Engineering, 2005, 131(1): 119-128.
[8]	FENG R, CHEN Y, CHEN D. Experimental and numerical investigations on collar plate and doubler plate reinforced SHS T-joints under axial compression[J]. Thin-Walled Structures, 2017, 110(10): 75-87.
[9]	赵必大, 李克, 刘成清, 等. 支主管夹角对X形圆钢管节点轴向传力的影响[J]. 西南交通大学学报, 2021, 56(2): 282-288.
[10]	常鸿飞, 罗梓, 徐玮, 等. 方钢管焊接T型节点轴向滞回性能分析[J]. 中国矿业大学学报, 2018, 47(4): 913-920.
[11]	王伟,陈以一,赵宪忠. 钢管节点性能化设计的研究现状与关键问题[J]. 土木工程学报, 2007(11): 1-8.
[12]	赵必大, 蔡扬政,王伟. 支主管夹角对X形圆钢管节点平面外受弯性能影响[J]. 工程力学, 2019, 36(7): 99-108.
[13]	NASSIRAEI H, LOTFOLLAHI-YAGHIN M A, AHMADI H, et al. Static strength of doubler plate reinforced tubular T/Y-joints under in-plane bending load[J]. Journal of Constructional Steel Research, 2017, 136(4): 49-64.
[14]	CHOO Y S, LIANG J X, VAN DER VEGRE G J, et al. Static strength of doubler plate reinforced CHS X-joints loaded by in-plane bending[J]. Journal of Constructional Steel Research, 2004, 60(12): 1725-1744.
[15]	CHEN Y, CHEN D. Ultimate capacities formulae of collar and doubler plates reinforced SHS X-joints under in-plane bending[J]. Thin-Walled Structures, 2016, 99(2): 21-34.
[16]	赵岩,李书文,黄宇星,等. 用外加劲肋加固T型圆钢管节点的试验研究[J]. 土木工程学报, 2014, 47(9): 70-75.
[17]	ZHU L, SONG Q, BAI Y, et al. Capacity of steel CHS T-Joints strengthened with external stiffeners under axial compression[J]. Thin-Walled Structures, 2017, 113(1): 39-46.
[18]	李涛,邵永波,张季超. 内置竖向插板加强型管节点静力强度研究[J]. 工程力学, 2010, 27(4): 133-140.
[19]	常鸿飞,夏军武,段晓牧,等. 方钢管覆板及竖向插板加强T形节点受压静力试验[J]. 建筑结构学报, 2013, 34(10): 57-63.
[20]	CHANG H F, XIA J W, GUO Z, et al. Experimental study on the axial compressive strength of vertical inner plate reinforced square hollow section T-joints[J]. Engineering Structures, 2018, 172 (6): 131-140.
[21]	中国工程建设协会.钢管结构技术规程:CECS 280∶2010[S]. 北京:中国计划出版社, 2010.
[22]	XIA J W, CHANG H F, GOLDSWORTHY H, et al. Axial hysteretic behavior of doubler-plate reinforced square hollow section tubular T-joints[J]. Marine Structures, 2017, 55:162-181.
[23]	ZHAO X L. Deformation limit and ultimate strength of welded T-joints in cold-formed RHS sections[J]. Journal of Constructional Steel Research, 2000, 53(2): 149-165.
[24]	European Committee for Standardization. Design of steel structures-part 1-8: design of Joints: EN 1993-1-8[S]. Brussels: European Committee for Standardization, 2005.
[25]	NASSIRARI H, LOTFOLLAHI-YAGHIN M A, AHMADI H. Static strength of collar plate reinforced tubular T/Y-joints under brace compressive loading[J]. Journal of Constructional Steel Research, 2016, 119(5): 39-49.