FRP加固钢筋混凝土桥墩基于性能的指标量化

Performance-based FRP RC bridge column and index quantization

将基于性能设计的思想与FRP加固钢筋混凝土桥墩相结合,对国内外98个FRP加固钢筋混凝土桥墩试件的位移角进行统计分析,给出了划分性能水平的位移角限值。对FRP加固钢筋混凝土桥墩的屈服位移角dy和极限位移角du进行单因素分析。讨论了位移角与纵筋率ρs、体积配筋率ρv、混凝土强度fc、轴压比n、剪跨比λ、及FRP特征值λf之间的关系,将显著影响位移角的因素:纵筋率ρs、轴压比n、FRP特征值λf考虑到量化当中,并给出修正公式。

The performance-based theory for FRP RC bridge column is put forward, combining the idea of performance-based design and FRP RC bridge column.Statistic analysis is conducted for the displacement angle of test specimen of 98 domestic and overseas FRP RC bridge columns,providing a displacement angle limit value for performance level division.Single factor analysis is done for yield displacement angle d, and limit displacement angle d,, ofFRP RC bridge column.The relationship between displacement angle and longitudinal reinforcement ratio p, volume reinforcement ratio p~, concrete strengthfl, axial pressure ratio n, shear span ratio A and FRP eigenvalue Af is discussed.The factors that in- fluence displacement angle greatly like longitudinal reinforcement ration ps, axial pressure ratio n and FRP eigenvalue Af are taken into considera- tion for quantization and modifier formula is proposed.