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为研究设计参数对改进型锚具力学性能、破坏形式的影响及锚固区黏结应力分布状况,对11组CFRP筋改进型锚具进行了静载测试。研究结果表明:锚具的破坏形式有筋材拉断、钢管破坏和胶体滑移,其中筋材拉断为理想形式。可通过测试钢管外表面应变,计算黏结应力得出其分布情况。在极限状态2 mm厚钢管,400 mm长,55 mm长夹片的GM-9锚具黏结应力分布与光滑曲线模型基本吻合,但有区别,所用测试方法可行;3 mm厚钢管,400 mm长,分别为50,80,90 mm长夹片的GM-1、GM-2、GM-3加载端黏结应力较大,异于光滑曲线模型;光滑曲线模型适用于破坏形式为胶体滑移的试件。建议设计参数为:钢管厚3 mm、长400 mm,夹片长55 mm、倾角6.5°、夹持位置为中间;胶体厚2 mm;可有效锚固单根直径为8 mm的CFRP筋,其极限承载力高达151.5 k N。
In order to study the influence of design parameters on the mechanical properties and failure modes of the improved anchorage and the distribution of the bond stress in the anchorage zone, 11 sets of CFRP tendons were tested for static load. The research results show that the failure modes of anchorage include pull-off of tendons, destruction of steel pipes and colloidal slip, of which the pull-out of tendons is the ideal form. Can test the outer surface of steel pipe strain, calculate the bond stress distribution. The bond stress distribution of GM-9 anchorage with 2 mm thick steel pipe, 400 mm long and 55 mm long clamp in the limit state is in good agreement with the smooth curve model. However, the test method is feasible. The 3 mm thick steel pipe with 400 mm length , Respectively. The bond stress of GM-1, GM-2 and GM-3 with 50, 80 and 90 mm long clips is larger than the smooth curve model. The smooth curve model is suitable for the test of damage form of colloidal slip Pieces. The recommended design parameters are: steel pipe thickness 3 mm, length 400 mm, clip length 55 mm, inclination angle 6.5 °, clamping position intermediate; colloid thickness 2 mm; effective anchoring of single CFRP bars with a diameter of 8 mm, Bearing capacity of up to 151.5 kN.