高性能复合砂浆钢筋网加固RC梁的时变可靠度分析

研究高性能复合砂浆钢筋网加固RC梁新老材料强度随时间衰减的可靠度指标.利用时变可靠度理论,采用蒙特卡罗法模拟,给出了高性能复合砂浆钢筋网加固混凝土构件时变失效概率的计算方法.复合砂浆钢筋网加固RC梁的时变可靠度先高于设计规范规定的目标可靠度 ,然后逐渐减小,接近设计使用年限时,接近目标可靠度,这一趋势为合理地评估结构性能提供了有效工具;结合非线性回归和时变可靠性指标,提出了加固RC构件使用寿命预测方法,为在役结构的维修与加固提供合理的经济决策依据.

Time-Dependent Reliability Analysis of RC Beams Strengthened by Ferrocement Mortar and Reinforcing Steel Bar Mesh

The reliability of the strength degradation of new and old materials for concrete members strengthened by ferrocement with time was investigated. Based on the time-dependent reliability theory and Monte Carlo simulation, the calculation method for the time-variant failure probability of concrete members strengthened with high performance composite mortar and reinforcing steel bar mesh was proposed. The timedependent reliability was higher than the target reliability defined in the design code, then decreased gradually, and at last approached the target reliability when it approached the service life. This tendency has provided an effective tool for the reasonable evaluation of the structural performance. Combining the time-dependent reliability with nonlinear regression, a method has been proposed to predict the remaining service life, which provides a reasonable and economical decision for the reinforcement of the service structure.