钢管混凝土桁肋内栓钉相贯节点受力行为试验研究

刘君平; 陈津凯; 陈宝春

doi:10.6052/j.issn.1000-4750.2016.05.0336

钢管混凝土桁肋内栓钉相贯节点受力行为试验研究

1.
福州大学土木工程学院, 福建, 福州 350108;
2.
福建省交通建设工程试验检测有限公司, 福建, 福州 350008

基金项目: 国家自然科学基金项目（51178118）

详细信息

作者简介:
刘君平(1977-),男,江西安福人,副教授,博士,从事钢混组合结构研究(E-mail:ljp0486@163.com);陈津凯(1987-),男,福建龙岩人,工程师,博士,从事桥梁结构及检测监测研究(E-mail:chjinkai@163.com).

通讯作者:
陈宝春(1958-),男,福建罗源人,教授,博士,博导,从事桥梁与结构工程研究(E-mail:baochunchen@fzu.edu.cn).

中图分类号: TU398.9
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出版历程
- 收稿日期: 2016-05-02
- 修回日期: 2016-06-30
- 刊出日期: 2017-09-24

EXPERIMENTAL STUDIES ON LOAD-TRANSFERRING MECHANISM OF CFST DIRECTLY-WELDED K-JOINTS WITH STUDS

1.
College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;
2.
Fujian Transportation Construction Engineering Testing Co., Ltd, Fuzhou, Fujian 350008, China

摘要

摘要: 进行了主管内壁设置栓钉的钢管混凝土K形相贯节点（内栓钉节点）受力行为试验，同时进行了无内栓钉节点的对比试验。试验时在主管上施加压力，在两根支管上分别施加等量同步的压力和拉力。试验结果表明，该文节点的破坏为受压支管屈曲，荷载-受压支管变形曲线（N-S 曲线）可分为弹性段和弹塑性段。无论有无内栓钉，主管焊接区域的应变都大于其他区域，它与荷载的关系曲线可分为弹性段和弹塑性段，而其余区域钢管均处于弹性状态。内栓钉不会改变主管钢管应变的分布规律，但是内栓钉的设置会减小主管钢管应变，表明内栓钉能将外力从钢管传递到管内混凝土，并且对应变集中的部位效果更显著。在主管轴向，应变主要集中在距离节点中心截面两侧各约2.7倍支管直径范围内；在主管环向，应变主要集中在圆心角-60°~60°区间。建议将此轴向与环向范围的应变集中区作为内栓钉的主要布设区域，区域外可以少布设或不布设。
- 钢管混凝土 /
- 相贯节点 /
- 内栓钉 /
- 应变集中系数 /
- 布设范围
Abstract: The behaviors of Concrete-filled steel tubular (CFST) directly-welded K-Joints with studs on the inner wall of the main steel tube (inner stud) were tested, as well as a specimen without stud for comparison. During the test, the main tube was under axial pressure, while the two web members were equivalently and simultaneously under a pressure and a tension, respectively. The results show that for the buckling failure of web member, the load-displacement curve of compressive web member consists of a linear elastic stage and an elastic-plasic stage. With or without studs, the strains of the main tube in welding area are larger than those in other areas, whose load-strain curves include linear elastic stage and elastic-plasic stage, while the strains in the other areas are in elastic state. The stain distribution of stud does not change, but the stress magnitude is reduced, indicating that the studs are able to transfer force from steel tube to core concrete, especially at the strain concentration area. In the axial direction of main tube, strain concentration are observed at the two sides of the center section of joint, with a range of 2.7 times of the side tube diameter. In the circular direction, strains mainly concentrate in an area between directions -60° and 60°. It is suggested that the inner studs should be arranged mainly on these longitudinal and transverse areas, and sparsely or not arranged outside.
- concrete-filled steel tube /
- tubular joint /
- inner stud /
- strain concentration factor /
- layout area

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参考文献(18)

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