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在国内首座CFRP索斜拉桥上使用并获得国家专利的锚具结构形式的基础上,研究了直筒+内锥+直筒的新型锚固方案;建立有限元模型,对比分析了优化前后的锚具筒壁接触应力和摩擦应力,结果定性地表明,在锚具末端设置直筒段的有效性;对改进后的锚具进行静载张拉试验,主要测试静载张拉过程中锚固区筋材表面的应力分布和变化情况;试验结果与有限元分析结果吻合良好,表明该优化方案有效可行;据锚具破坏前锚固区的应力转移现象提出了对粘结式CFRP锚具的破坏监测方法。
Based on the structure of the anchor used in the first CFRP cable-stayed bridge in China and obtained the national patent, a new type of anchorage scheme of straight tube + inner cone + straight tube was studied. The finite element model was established and the anchorage tube before and after optimization Wall contact stress and frictional stress. The results qualitatively indicate the effectiveness of setting the straight barrel section at the end of the anchorage. The improved anchorage is subjected to the static-loading tensile test, which mainly tests the surface tension of the anchorage zone during the static loading process Stress distribution and variation of the CFRP anchorage system. The experimental results are in good agreement with the finite element analysis. The results show that the optimization scheme is effective and feasible. The method of monitoring the failure of the bonded CFRP anchorage is proposed based on the stress transfer phenomena in the anchorage zone before the anchorage failure.