在役公路钢桥可靠性评估方法研究

发布时间：2019-06-02 13:57

【摘要】：为构建在役公路钢桥安全评估技术,保证在役桥梁的运营安全,研究分析基于可靠指标和基于分项系数2种可靠性评估方法。依据公路桥梁承载能力检测评定规程中的钢结构桥梁承载能力检算系数和活载影响修正系数,建立在役钢桥劣化状态极限状态方程,利用0.618优化法,得到2种评估方法相应技术参数及指标。研究表明,公路钢桥技术状况可按优、良、中、差、劣和失效6种等级区间划分。基于可靠指标评估方法中,优、良、中、差、劣5种桥梁技术状况,分别对应评估目标可靠指标为4.2、3.8、3.5、3.3和3.0;基于分项系数评估方法中,优、良、中、差、劣5种桥梁技术状况,分别对应抗力分项系数为1.35、1.25、1.2、1.15和1.1。2种评估方法可认为是等效统一的。
[Abstract]:In order to construct the safety assessment technology of in-service highway steel bridge and ensure the operation safety of in-service bridge, two reliability evaluation methods based on reliability index and partial coefficient are studied and analyzed. According to the checking coefficient of bearing capacity of steel structure bridge and the correction coefficient of live load influence in the code for testing and evaluating the bearing capacity of highway bridge, the limit state equation of deterioration state of steel bridge in service is established, and the 0.618 optimization method is used. The corresponding technical parameters and indexes of the two evaluation methods are obtained. The results show that the technical status of highway steel bridge can be divided into six grades: excellent, good, medium, poor, inferior and invalid. Based on the reliability index evaluation method, the technical status of five kinds of bridges is excellent, good, medium, poor and inferior, and the corresponding reliability indexes are 4.2, 3.8, 3.5, 3.3 and 3.0, respectively. Based on the partial coefficient evaluation method, five kinds of bridge technical conditions, excellent, good, medium, poor and inferior, corresponding to the resistance partial coefficient of 1.35, 1.25, 1.2, 1.15 and 1.1.2, respectively, can be considered to be equivalent and unified.
【作者单位】：中国铁道科学研究院铁道建筑研究所;
【基金】：交通运输部西部交通建设科技项目(20113185191410)
【分类号】：U448.36

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