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设计了一种CFRP筋夹板式锚具,通过对40个CFRP筋-锚具组装件的拉拔试验,研究了锚固长度、螺栓预紧力、螺栓数量和CFRP筋表面处理等对锚具锚固性能的影响。试验结果表明:试件的破坏形态包括CFRP筋的滑移、断裂和拉脱三种,试件达到极限荷载时的滑移量较小。增加锚固长度、螺栓总预紧力、螺栓数量以及对CFRP筋表面打磨处理均可在一定范围内提高锚具试件的极限荷载。通过合理控制上述参数,可以使锚具发挥良好的锚固性能,满足实际使用要求。该文给出了CFRP筋夹板式锚具合理的构造和螺栓预紧力值。在试验研究基础上,分析了CFRP筋夹板式锚具的锚固作用机理,建立考虑锚固长度、螺栓预紧力和螺栓数量的CFRP筋-锚具界面平均摩擦系数模型,并提出夹板式锚具的极限荷载计算公式,与试验结果吻合良好,具有较好的适用性。
A kind of CFRP tendon splint anchorage was designed. The anchorage performance of anchorage device such as anchorage length, bolt pretightening force, bolt number and surface treatment of CFRP tendons was studied through the pullout test of 40 CFRP tendons-anchorage assembly. Impact. The test results show that the failure modes of the specimens include the slip, fracture and pull-off of the CFRP tendons. When the specimen reaches the limit load, the slip amount is small. Increasing the anchorage length, the total bolt pretightening force, the number of bolts and the grinding process on the surface of CFRP tendons can increase the ultimate load of the anchorage specimen within a certain range. Through the reasonable control of the above parameters, can make anchors play a good anchoring performance to meet the actual use requirements. This paper gives the reasonable construction of CFRP tendons and their pre-tightening force. Based on the experimental study, the anchoring mechanism of CFRP tendons was analyzed, and the average friction coefficient of CFRP tendons and anchors interface was established considering the anchorage length, bolt pretightening force and bolt number. The calculation formula of ultimate load is in good agreement with the test result and has good applicability.