高强螺栓灌浆套管端板拼接节点试验研究

Experimental Research on Structural Behavior of High-Strength Bolted Grouted Sleeve Flush Endplate Connections

本文提出了一种新型H形截面钢高强螺栓端板拼接节点,即容错度较好的高强螺栓灌浆套管端板拼接节点。为研究此节点的受力性能,实验设计了2个足尺试件,对其进行静力加载破坏试验,分析节点的受力特性、承载力性能、高强螺栓的拉力分布规律及破坏模式,并同时设计2个试件与该节点对应的高强螺栓端板拼接节点进行受力性能的对比。试验结果表明:相较于高强螺栓端板拼接节点,该节点的抗弯承载力及延性提高较显著;抗剪承载力基本相同;受压区螺栓的拉力分布基本一致,受拉区螺栓的拉力分布,随着荷载的增大,其拉力始终小于高强螺栓端板拼接节点的受拉区螺栓。研究表明此节点由于端板上可以适当地开大螺栓孔径的大小而不影响其受力性能,故可以有效地解决高强螺栓的安装难度,便于施工现场安装。

A new type of flush endplate connection, named better-tolerance high-strength bolted grouted sleeve flush endplate connection, was developed for splice H-shape steel. In this paper, the static loading failure tests were conducted on two specimens in order to evaluate load transfer mechanism, strength capacity, tensile force distribution of high-strength bolts and failure mode of this type of connection, furthermore, the other two specimens of its corresponding type of high-strength bolted flush endplate connections were designed to compare their mechanical performances. The experimental results indicate that by comparing with high-strength bolted flush endplate connections, the bending capacity and ductility of high-strength bolted grouted sleeve flush endplate connections increases remarkably, the shearing capacity and the tension distribution of the bolts in the compression zone is basically the same, but with the increase of the load, the tension distribution of bolts in tension zone is smaller than the high-strength bolt endplate flush endplate connections. The results show that since the bolt aperture can be properly opened largely without affecting its mechanical performance, so this type of connection can effectively solve the installation difficulty of high-strength bolts, and facilitate to install at construction sites.