CFRP筋在RPC中锚固性能的理论分析及试验研究  

THEORETICAL AND EXPERIMETAL INVESTIGATION ON ANCHORAGE PERORMANCE OF CFRP TENDON IN RPC

作　　者：蒋田勇[1,2] 方志[2] 

机构地区：[1]长江理工大学土木与建筑学院,湖南长沙410076 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《工程力学》2009年第1期166-173,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50478052);教育部优秀青年教师资助计划项目(教人司(2002)350)

摘　　要：静载试验详细研究了碳纤维增强塑料CFRP筋在活性粉末混凝土RPC的锚固性能。试验结果表明:对于抗拉强度不大于3000MPa的表面压纹CFRP筋在抗压强度130MPa的RPC中的临界锚固长度为20倍CFRP筋直径;多根压纹CFRP筋的合理筋间距为1倍CFRP筋直径。平均粘结强度及其对应滑移量的公式具有较好的适用性。平均粘结应力与滑移之间的预测曲线与试验曲线吻合较好,验证了提出的粘结滑移本构关系。理论推导了锚固变量沿锚固长度分布的表达式,算例验证了有效性。分析表明:距离自由端约为0.6倍锚固长度位置处的粘结应力等于平均粘结应力。对于压纹CFRP筋,当锚长≤12.5倍筋材直径时,粘结应力沿埋长分布较为均匀,其不均匀性系数在1.02―1.05之间;当埋长>12.5倍且≤20倍筋材直径时,粘结应力沿埋长分布较为不均匀,其不均匀性系数在1.05―1.14之间。The anchorage performance of CFRP （Carbon Fiber Reinforced Polymer/Plastics） tendon in RPC （Reactive Powder Concrete） has been studied. The test results show that： 1） For the CFRP tendon with indented surface, used in RPC with compressive strength of 130 MPa, the grouted length of 20 times of its diameter is enough to resist a tensile strength of less than 3000 MPa. 2） The rod space should not be less than rod diameter if multiple CFRP tendons are applied in the anchorage system. 3） The equations developed to determine bond capacity and slip between CFRP tendon and RPC are feasible. Furthermore, an analytical model of bond stress-slip relationships for CFRP tendon has been proposed, and its effectiveness to describe the bond-slip behavior has been demonstrated. It is also found： 1） The bond stress at the point, 0.6 grouted length from the free end, is equal to the average bond stress. 2） If the grouted length is less than 12.5 times of its diameter, the bond stress varies along bond length rather uniformly, with the asymmetric coefficient lying between 1.02- 1.05.3） If the grouted length is more than 12.5 times of its diameters but not more than 20 times, the bond stress varies along bond length non-uniformly, with the asymmetric coefficient lying between 1.05- 1.14.

关 键 词：锚固性能 粘结应力 临界锚固长度 CFRP RPC 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]