T形件-钢管螺纹锚固单边螺栓连接受拉性能试验研究

刘闵; 张越; 牛广慧; 袁健; 王培军; 袁昊天

doi:10.13206/j.gjgs21070501

T形件-钢管螺纹锚固单边螺栓连接受拉性能试验研究

doi: 10.13206/j.gjgs21070501

刘闵^1,2,
张越¹,
牛广慧²,
袁健²,
王培军^1, ,,
袁昊天¹

1. 山东大学土建与水利学院, 济南 250061;
2. 山东三箭建设工程股份有限公司, 济南 250000

基金项目:

国家自然科学基金面上项目（52078280）。

详细信息

作者简介:
刘闵,男,1984年出生,高级工程师。

通讯作者:
王培军,男,1976年出生,博士,教授,pjwang@sdu.edu.cn。

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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-05
- 网络出版日期: 2022-07-23

Experimental Research on Thread-Fixed One-Side Bolted Connection Between T-stub and Steel Tube Subjected to Tension

1. School of Civil Engineering, Shandong University, Jinan 250061, China;
2. Shandong Sanjian Construction Engineering Co., Ltd., Jinan 250000, China

摘要

摘要: 钢结构框架柱采用闭口截面具有截面承载效率高、抗扭模量大等优势。利用螺纹锚固单边螺栓可以解决钢梁-钢管柱无法采用普通高强螺栓直接连接的问题。螺纹锚固单边螺栓是通过在柱壁上加工带有螺纹的螺栓孔，直接将高强螺栓拧紧在柱壁的螺纹孔上来代替传统螺母，实现在钢管柱外侧安装和拧紧。在螺纹锚固单边螺栓双T形节点模型研究的基础上，进一步研究了螺纹锚固单边螺栓连接T形件-钢管的受力机理和破坏模式。对10个采用螺纹锚固单边螺栓连接T形件-钢管节点进行了受拉试验研究，分析和对比了不同节点破坏模式、承载力机理、位移-荷载曲线、屈服承载力和极限承载力等。
试验发现：节点共发生了四种破坏，分别为螺纹剪切破坏、管壁局部屈服伴随螺纹剪切破坏、螺栓杆拉断破坏和管壁屈服破坏。当钢管壁厚度较小时，节点发生螺栓孔内螺纹剪切破坏，当管壁较厚，螺栓直径相对较小时，发生螺栓杆拉断破坏，但螺纹孔内螺纹保持完好，表明当螺栓孔内螺纹长度足够时，钢管壁螺栓孔内螺纹具有足够的承载力，螺纹锚固方式可行。
同时对比分析了螺栓间距、螺栓直径及管壁厚度对节点承载力的影响。试验结果表明：增大螺栓直径、管壁厚度、螺栓间距等，均可以提高节点的承载力；螺栓间距对节点承载力的影响与钢管壁在螺栓拉力作用下屈服线的形状有关，当螺栓间距较小时，各受拉螺栓对钢管壁的屈服线相互叠加，随着螺栓间距增大，节点承载力明显提高；但当螺栓间距较大，各受拉螺栓对钢管壁屈服线为长圆形，随螺栓间距的增加，节点承载力将保持不变；随着螺栓直径的增加，节点的破坏模式逐渐从螺杆拉断破坏改变为钢管壁螺栓孔螺纹破坏或钢管壁屈服破坏，节点承载能力增加；管壁厚度增加显著提高钢管壁屈服承载力，其增长率与壁厚的增长率近似呈平方的关系。
为了避免钢管壁较薄时，管壁螺栓孔内螺纹锚固力不足的问题，进一步研究了钢管内设垫板对螺纹锚固单边螺栓T形件-钢管连接节点受力性能的影响。试验结果表明：垫板增加了螺纹锚固长度，加强后的节点承载力显著提高，有效地避免螺纹剪切破坏，但初始刚度变化不大。
- 螺纹锚固单边螺栓 /
- 螺栓连接节点 /
- 破坏模式 /
- 受拉屈服承载力
Abstract: The closed section of steel frame column has the advantages of high bearing efficiency and large torsional modulus. The problem that steel beam and Hollow Square Column(HSC) cannot be directly connected by ordinary high-strength bolts can be solved by using thread-fixed one-side bolt(TOB). TOB is to directly tighten the high-strength bolt on the threaded hole of the column wall by machining the threaded bolt hole on the column wall, instead of the traditional nut, so as to realize the installation and tightening on the outside of the steel tube column. Based on the study of the thread-fixed one-side bolted double T-joint model, the stress mechanism and failure mode of thread-fixed one-side bolted T-stub with steel tube are further studied. The tensile tests of 10 thread-fixed one-side bolted T-stub with steel tube joints were carried out. The failure modes, bearing capacity mechanisms, displacement-load curves, yield capacity and ultimate bearing capacity of different joints were analyzed and compared.
It is found that there are four kinds of failure modes, which are thread shear failure, tube wall local yield with thread shear failure, bolt rod tensile failure and tube wall yield failure. When the thickness of the steel tube wall is small, the thread shear failure in the bolt hole occurs. When the tube wall is thick and the bolt diameter is relatively small, the bolt rod is broken and the internal thread of the threaded hole remains intact, indicating that when the internal thread length of the bolt hole is sufficient, the internal thread of the bolt hole of the steel tube wall has sufficient bearing capacity and the thread anchoring method is feasible.
At the same time, the effects of bolt spacing, bolt diameter and tube wall thickness on the bearing capacity of the joint are compared and analyzed. The test results show that the bearing capacity of the joint can be improved by increasing the bolt diameter, tube wall thickness and bolt spacing. The influence of bolt spacing on the bearing capacity of the joint is related to the shape of the yield line of the steel tube wall under the bolt tension. When the bolt spacing is small, the yield lines of tensile bolts on the steel tube wall are superimposed. With the increase of bolt spacing, the bearing capacity of the joint is significantly improved. However, when the bolt spacing is large, the yield line of each tensile bolt to the steel tube wall is oblong. With the increase of bolt spacing, the bearing capacity of the joint will remain unchanged. With the increase of the bolt diameter, the failure mode of the joint gradually changes from the bolt rod tensile failure to the thread shear failure or tube wall yield failure, and the bearing capacity of the joint increases. The increase of tube wall thickness significantly increases the yield capacity of steel tube wall, and the growth rate is approximately square with the growth rate of wall thickness.
In order to avoid the problem of insufficient anchoring force in the bolt hole of the steel tube wall when the steel tube wall is thin, the influence of the steel tube with a backing plate on the mechanical performance of the thread-fixed one-side bolted T-stub with steel tube joint is further studied. The test results show that the anchor length of the thread is increased, the bearing capacity of the strengthened joint is significantly improved, and the shear failure of the thread is effectively avoided, but the initial stiffness changes little.
- thread-fixed one-side bolt /
- bolted connection /
- failure mode /
- tensile yield strength

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