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介绍了现存桥梁抗震性能评估过程 ,用区间建模评估过程中的不确定性量及区间运算求地震力和最大弯矩的值域 ,评估过程应用测试的环境振动 ,评估计算分两种情况 :一是只能估计现存桥梁的固有频率 ,应用迭代过程可求得等效长度的区间向量 ;二是固有频率和振型都可以使用 ,直接可计算桥墩的等效长度。区间分析给出桥墩最大弯矩的值域 ,对抗震评估更接近于实际情况 ,并给出一个具体实例 ,展示与通常评估的差别
This paper introduces the evaluation process of seismic performance of existing bridges, evaluates the range of seismic force and maximum bending moment by using the uncertainty of interval modeling and interval calculation, and evaluates the environmental vibration of the process application test. There are two cases: One is to estimate the natural frequency of an existing bridge. The iterative process can be used to obtain the equivalent length of interval vector. The other is that the natural frequency and mode shapes can be used, and the equivalent length of the piers can be calculated directly. The interval analysis gives the maximum bending moment of bridge piers. The evaluation of the earthquake resistance is closer to the actual situation, and a concrete example is given to show the difference from the usual assessment