【摘要】 采用动态可靠性基本理论,在进行随机过程分析的基础上,给出在役桥梁荷载和抗力的时变演化规律。将可靠度评估方法运用到双曲拱桥中,提出针对拱桥特征的基本假设,给出可靠性指标的计算方法和详细分析步骤,并强调计算过程中的关键技术。通过具体应用实例即东门大桥主桥的使用寿命预测,实现对加固后的拱桥寿命预测。加固后桥梁的寿命预测能够有效的检验加固方法的合理性,所采用的研究思路、方法具有较强的实用性,为同类桥梁可靠性综合评价提供理论基础。更多还原

【Abstract】 Based on stochastic investigating theory,the evolution law of the external load and internal resisting power of existing bridges was presented using elementary technique of dynamic reliability.In order to put the reliability evaluating method onto two-way curved arch bridge,calculating scheme of reliability index was derived after typical characteristics of arch bridge were put forward.During the computing procedure,the solving steps of the calculation were explained in detail and the key points were emphasized.The proposed scheme was applied into actual engineering for lifetime prediction.The results show good agreement between numerical prediction and experiment measurement.The lifetime prediction for strengthened bridge appears to be rationality to reinforcement method,which proves great practicability.The research method proposed provides valuable analytical basis for similar kinds of arch bridges.更多还原