钢筋及GFRP筋锚杆与框架梁连接方式研究

Connection of frame beams with anchor roads with GFRP and steel bars

锚杆与框架梁的连接方式影响加固效果和工艺流程。GFRP筋锚杆以其耐腐蚀、高强度特性成为钢筋锚杆腐蚀问题解决途径之一,GFRP筋锚杆与框架梁的有效连接方式是需要研究的问题。通过钢筋折杆、钢筋直杆及GFRP筋直杆的框架梁锚固模型试验,研究钢筋和GFRP筋锚杆框架梁锚固效果的差异。研究结果表明,为施加预应力而研制的锁定装置能够实现FRP筋的预应力张拉和锁定,工作状态稳定,拆装方便操作简单;钢筋折杆的框架梁锚固效果明显优于钢筋直杆锚固形式,相同厚度梁体下,折杆框架梁锚固结构能承担更高的荷载;钢筋直杆与GFRP筋直杆的框架梁锚固效果相近;以GFRP筋直杆等体积取代钢筋锚杆时,按照钢筋弯折锚固形式设计的框架梁厚度不能直接用于GFRP筋锚杆锚固,须根据直杆锚固试验确定框架梁厚度。

The connection of anchor rods with frame beams can significantly influence the anchoring effectiveness and technological process. Glass fiber reinforced polymer（GFRP） bar is a good substitute to steel bar owing to its significant corrosion resistance and high strength characteristics. The connecting quality between GFRP bars and frame beams is a problem that needs to be studied. Through model tests on anchorage of frame beams, the anchoring effect of GFRP bars, straight steel bars and bending steel bars is analyzed. The test results show that the device developed for the application of prestressing is stable, and easy to assemble and disassemble. The anchoring effectiveness of steel bars with bending end is better than that with straight bars. The anchoring quality of GFRP bars and steel bars is similar. In addition, anchor structure of GFRP bars cannot follow the existing standards designed for the bending steel bars, and its anchoring thickness needs to be decided by model tests on anchorage of frame beams for straight bars.