基于性能的FRP加固混凝土柱抗震水平及指标选取

Performance-based Seismic Level Division and Index Choosing for RC Column Strengthened with FRP

在研究FRP加固混凝土框架柱的抗震性能时引入了基于性能的抗震设计理论,从适用性、经济可修性、安全性三个方面将FRP加固框架柱的抗震性能划分为5个等级:正常使用、暂时使用、可修使用、生命安全及防止倒塌.对FRP加固框架柱的位移角限值进行统计分析,讨论了位移角与纵筋率ρs、配箍特征值λv、剪跨比λ、轴压比n及FRP特征值λf之间的关系;结果表明,n和λf对位移角有显著影响.选取位移角作为性能指标,并将n和λf引入到位移角的量化当中,给出了基于性能的抗震设计的指标限值.

The performance-based seismic design （PBSD） theory was introduced into the performance analysis of RC frame column strengthened with FRP. The anti-seismic performance was divided into 5 levels in terms of applicability, repairability and security, i. e., fully operational level, temporarily operational level, repairable level, life safety level and collapse prevention level. The drift limits of the columns were statistically analyzed, and the relationship was discussed between the drift and longitudinal reinforcement ratio Ps, confining reinforcement characteristic values ）,v, shear span-to-depth ratioλ, axial compression ratio n, as well as FRP characteristic values λ f, with the conclusion obtained that n and A f significantly affect the drift. Using the drift as performance index and introducing n and λf into the quantization of the drift, the drift limit of PBSD was presented.