摘要
基于条带法提出了考虑二次受力影响的外粘纤维片材加固钢筋混凝土梁抗弯承载力的两阶段接力计算方法。和已有试验结果的比较表明数值计算方法具有足够的精度。为考虑二次受力对不同加固梁的影响,设计了18根数值分析试件,采用建议的数值计算方法对每个试件在不同持荷水平下的承载力进行了计算,并和《混凝土结构加固设计规范(》GB 50367—2006)推荐的承载力计算结果进行了比较分析。结果表明,规范方法对于计算钢筋拉断及钢筋超筋破坏模式下梁的抗弯承载力会给出不安全的结果。
Based on the strip method,a relay numerical calculation method for the bending bearing capacity of reinforced concrete beams strengthened with externally bonded FRP sheets considering the effect of the second loading was proposed.Comparing the calculation results with the existing test results,it was verified that the numerical calculation method is accurate enough to be used to calculate the bending bearing capacity of strengthened reinforced concrete beams.To consider the effect of the second loading on the bending bearing capacity of the beams,18 numerical analysis specimens were designed.The bending bearing capacity for each beam strengthened under certain sustained load was calculated by using the proposed relay numerical calculation method,and it was compared with the corresponding value calculated by using the method recommended by the＂Design code for strengthening concrete structures＂（GB 50367—2006）.The results showed that method recommended by the national code may overestimate the bending bearing capacity of a strengthened beam whose damage model is the breaking of the steel bars or the crushing of the concrete but the steel bars remain in elastic stage.
出处
《结构工程师》
2011年第4期134-139,共6页
Structural Engineers
基金
国家科技支撑计划课题(2006BAJ03A07)
关键词
二次受力
外粘纤维片材加固
数值算法
条分法
接力计算
second loading
strengthening with externally bonded FRP sheet
numerical calculation method
strip method
relay calculation
