时变可靠度理论下梁桥安全性评估方法研究

Study on Safety Assessment Method of the Beam Bridge Based on Time-varying Reliability Theory

运用在役桥梁结构时变修正参数,建立适用桥梁安全性评估的结构实际承载力计算模型、实际刚度计算模型和时变可靠度计算模型,提出桥梁结构安全评估参数,通过桥梁结构算例的模拟分析,结合评估参数与计算桥梁服役时间之间的关系进行公式拟合,以便用于梁桥的安全性评估。结果表明:采用时变可靠度理论下梁桥评估方法计算桥梁的实际抗弯承载力、实际抗剪承载力、实际抗弯刚度和实际可靠性指标,推定结果与检查结构结果做到较好吻合,验证钢筋混凝土梁桥承载安全性评估方法的有效性。该方法为桥梁安全性评估提供了参考。

Using the time-varying correction parameters of the active bridge structure,the actual bearing capacity calculation model,the actual stiffness calculation model and the time-varying reliability calculation model are established for the evaluation of the load safety of the active bridge.The safety evaluation parameters of the bridge structure are put forward,and the evaluation parameters and measures are combined through the simulation analysis of the example of the bridge structure.The relationship between the service time of the bridge is calculated and the formula is fitted in order to evaluate the bearing safety of the bridge.The results show that the actual bending bearing capacity,the actual shear carrying capacity,the actual bending stiffness and the actual reliability index of the bridge are calculated by the time-dependent reliability theory.The result of presumption is in good agreement with the result of structure examination,which verifies the effectiveness of the load bearing safety evaluation method of reinforced concrete beam bridge,and can be used for carrying safety evaluation of bridges.This method provides reference for carrying safety assessment of bridges.