钢框架带悬臂梁拼接节点的抗水平地表变形试验研究

以单层单跨带悬臂梁段拼接钢框架为研究对象,通过地表变形的物理相似模拟试验,研究了钢框架带悬臂梁段拼接节点在地表水平变形作用下的附加应力和变形规律。主要研究在水平拉伸和水平压缩作用下,拼接节点处腹板拼接板和上下翼缘拼接板内产生的附加内力及变形曲线,分析了上下翼缘拼接板和腹板拼接板中间位置点的变形值随着试验加载值的增加而变化的原因。研究结果表明：地表水平拉伸作用最为不利;拼接节点虽会产生附加变形,但在很大程度上仍处于弹性阶段,卸栽后可以恢复,表现出良好的抗变形性能。最后给出建议：在地表变形地区新建或加固改造钢结构建构筑物时,采用钢框架带悬臂梁段高强螺栓拼接连接,可以很好地吸收变形能。

Experimental Research on the Behavior of the Splice Joint for the Steel Frame with Cantilever Section to Resist the Horizontal Deformation on the Ground

Taking the single-level,single-span steel frame jointing with cantilever section as the research object,this paper describes the physical simulation experiment of the deformation due to surface mining and studies the additional stress and deformation of the steel frame splice joints under the action of the horizontal deformation on the ground.The main research result is the curve of internal force and the deformation of splice plate on web and upper and lower flanges,which belong to the splice joint under the horizontal stretching and the horizontal compression.We analyze the reason of the variation of deformation value located in the middle of the upper and lower flanges and web with the load increasing on the test.The results show that the surface horizontal stretch is the most unfavorable action;although the jointing nodes will produce deformations,they are still in the elastic deformation stage to a large extent,and will recover after unloading,so the splice joints show good anti-deformation performance.Finally,we suggest that steel frame with the beam section,which is connected by splicing joints with high-strength bolts can well absorb deformation energy,when new or reinforced steel building structures are located in the ground deformation areas.