混合纤维布加固损伤RC梁抗弯承载性能研究  

Study on bend performance of damaged RC beam strengthened by hybrid FRP sheets

作　　者：褚云朋[1] 侯鸿杰 甘璐[1] 贾彬[1] Chu Yunpeng;Hou Hongjie;Gan Lu;Jia Bin(College of Civil Engineering,Southwest University of Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学,四川绵阳621010

出　　处：《建筑科学》2018年第11期115-121,154,共8页Building Science

基　　金：国家自然科学基金项目(51568058);四川省非金属复合与功能材料重点实验室开放基金(12zxfk01)

摘　　要：碳纤维布和玻璃纤维布混合后能有效提高材料拉伸率,改善碳纤维布材料脆性性质,使加固RC梁抗弯承载性能得到明显改善。对粘贴一层混编纤维及两层混杂纤维片材的损伤梁进行抗弯承载性能试验研究、有限元分析及理论计算,结果表明:①采用混合纤维加固后梁承载能力明显提高,延性性能改善明显;②混合纤维布中延伸率高的玻璃纤维布有效抑制了碳纤维布的随机断裂,加载后期刚度降低缓慢,玻璃纤维布对抑制梁的承载力及刚度的降低作用明显;根据有限元分析,两层玻璃维布加一层玻碳纤维布的梁应变增长较两层碳纤维布加一层玻璃纤维布的梁更为平缓,梁的承载能力也提高更多;③考虑原有梁加载损伤情况后,对加固梁承载力进行系数折减计算后,与试验值吻合较好。Carbon fiber sheet mixed with glass fiber cloth can effectively improve the elongation of the material and the carbon fiber cloth's properties of brittleness,so that bending bearing capacity of reinforced RC beams has been significantly improved.Firstly,two damaged concrete beams are strengthened with one and two layers of fiber reinforced polymers,respectively.Then,the flexural loading capacities of these two beams are studied by experiment method,finite element analysis and theory calculation.Then results show that:①the load-bearing and ductility of beams strengthened with hybrid fiber sheet of two layers improve obviously;②the glass fiber cloth with high elongation in the mixed fiber cloth.can delay the random fracture of the carbon fiber cloth,the stiffness of beams decreases slowly in the last state of loading,so glass fiber cloth had curbed the decreasing of beams' bearing capacity and stiffness obviously,and by FEM,the state of beams,with two layers of glass fiber cloth and a layer of carbon fiber cloth,grows more slowly than the beams of two layers of carbon fiber cloth and a layer of glass fiber cloth,and the bearing capacity increases;③considering the damage of the original beams,after reduction for the bearing capacity of reinforced beam,it could fit well with the results of experiment.

关 键 词：损伤RC梁 FRP布混杂加固 抗弯性能 试验研究 理论计算 有限元分析 

分 类 号：TU312.3[建筑科学—结构工程]