钢筋及GFRP筋锚杆与框架梁连接方式研究

发布时间：2019-03-13 21:13

【摘要】：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。
[Abstract]:The connection mode of anchor bar and frame beam affects reinforcement effect and process flow. GFRP bar anchor bar has become one of the solutions to corrosion problem of steel bar bolt because of its corrosion resistance and high strength characteristic. The effective connection between GFRP bar anchor and frame beam is a problem that needs to be studied. The difference of anchoring effect between steel bar and GFRP bar is studied by model test of frame beam anchoring with folded bar, straight bar and GFRP bar. The results show that the locking device developed to apply prestressing force can realize the prestressing tension and locking of FRP bars, the working state is stable, and the operation is easy to disassemble and assemble. The anchoring effect of frame beam with folded bar is obviously better than that with straight bar. Under the same thickness of beam, the anchoring structure of frame beam with folding bar can bear higher load, and the anchoring effect of straight bar with steel bar is similar to that with straight bar with GFRP bar. When the steel bar anchor is replaced by GFRP bar, the thickness of frame beam designed according to the bending and bending anchoring pattern of steel bar can not be directly used for anchor of GFRP bar. The thickness of frame beam should be determined according to the anchor test of straight bar.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学道路与铁道工程研究所;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金项目(41472240) 广东省教育部科技部产学研项目(2009B090600111) 中央高校基本科研业务费项目(2015B25514)
【分类号】：TU476

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