近断层竖向地震的特征及对川藏铁路连续梁桥的影响分析

Analysis of the Characteristics of Vertical Earthquakes near Faults and Their Influenceon Sichuan-Tibet Railway Continuous Beam Bridges

为了分析近断层地震竖向与水平向加速度峰值比取值特点及对铁路连续梁桥的影响,通过大量地震动数据的筛选、处理及统计分析,发现通常加速度峰值比取1/2~2/3的取值明显偏小,并采用有限元模拟分析,得出了竖向地震动对连续梁桥的影响规律,对了解川藏线竖向地震动的规律特点及对连续梁桥的设计、施工具有一定的参考价值,也对川藏铁路支架、挂篮等临时结构的设计具有指导意义.

In order to analysis the characteristics of the peak acceleration ratio of vertical and horizontal of near-fault earthquakes and its influence on railway continuous beam bridge.Through the screening,processing and statistical analysis of a large number of ground motion data,it is found that the peak acceleration ratio is obviously smaller than the value of 1/2-2/3,and the influence law of vertical ground motion on continuous beam bridge is obtained by using finite element simulation analysis.This study has a certain reference value for understanding the characteristics of vertical ground motion of Sichuan-Tibet railway and for the design and construction of continuous beam bridge,It is also of guiding significance for the design of temporary structures such as supports and hanging baskets.