方钢管覆板及竖向插板加强节点平面内抗弯性能

温志宏; 李照伟; 魏海丰; 龙帮云

doi:10.3724/j.gyjzG22071402

方钢管覆板及竖向插板加强节点平面内抗弯性能

doi: 10.3724/j.gyjzG22071402

1. 中交第四公路工程局有限公司, 北京 100020;
2. 中国矿业大学, 江苏省土木工程灾变与环境可靠度重点实验室, 江苏徐州 221116

基金项目:

国家自然科学基金项目(51978657)。

详细信息

作者简介:
温志宏,工程学士,高级工程师、一级建造师,主要从事房建工程的管理与研究工作。

通讯作者:
龙帮云,硕士,副教授,主要从事建筑结构鉴定与加固、建筑结构抗震与防灾,lbygbh@cumt.edu.cn。

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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-14
- 网络出版日期: 2025-04-02

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

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

摘要

摘要: 为研究覆板及插板加强对方钢管节点平面内抗弯性能的影响,对支主管宽度比β=0.8的未加强和覆板加强、竖向插板加强节点,以及等宽节点试件进行静力加载试验,分析了节点的破坏模式、弯矩-应变和弯矩-转角曲线,建立了β=0.4,0.6,0.8的未加强、覆板加强及插板加强节点有限元模型,并进行节点抗弯承载机理分析。试验表明:覆板及竖向插板对节点抗弯能力的加强效果明显,竖向插板加强节点的抗弯承载力和初始刚度较未加强节点提高可达71%和123%;竖向插板加强可较好保护支管根部焊缝,将破坏转移为支管屈服;覆板则通过保护主管翼缘,将节点的破坏模式由主管翼缘屈服变为覆板屈服;加强节点的延性较好,但其承载力和刚度低于等宽节点。进一步的机理分析表明:覆板对主管翼缘的局部加厚可提高其受压刚度,进而提高节点的抗弯能力;竖向插板则通过加劲肋效应增强节点域抗弯刚度,保护支管根部焊缝,实现节点的抗弯加强。
- 方钢管 /
- 覆板加强节点 /
- 竖向插板加强节点 /
- 平面内抗弯 /
- 试验研究 /
- 有限元
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

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