基于离差最大化的连续刚构桥抗震性能设计参数研究

Research on design parameters of seismic performance of continuous rigid frame bridge based on maximum deviation

在连续刚构桥抗震性能设计时,为避免调整设计参数的盲目性和随意性,研究某些关键截面设计参数的权重具有重要的实际工程价值。以可克达拉大桥为工程背景,运用离差最大化法计算各关键截面设计参数的权重及灰色关联分析法计算抗震性能方案的评价值。结果表明:高低墩权重变异系数最大,对抗震性能影响最为显著;在进行连续刚构桥抗震方案选取时,墩顶和墩底剪力方案评价值最大,应首先考虑。离差最大化法在计算参数权重时简单易行,避免了正交实验表法确定因素水平等级时受主观因素影响较大的缺点。

In the seismic design of continuous rigid frames, researching the weight of design parame-ters of some key sections has important values. Taking Kekedala bridge as an example, the evalua-tion values of seismic performance and the weight of design parameters of some key sections were calculated using the method of grey correlation and maximum deviation. The results indicate that high and low piers have the most significant impact on the seismic performance, and that the varia-tion coefficients of their weights are the biggest. The evaluation value of the pier shear is the maxi-mum, which should be considered in the first place when selecting programs of continuous rigid frame bridge. The disadvantage of orthogonal experimental method is that the method is greatly influ-enced by subjective reasons when determining the level of factors, but this can be avoided using maximum deviation which is simple and easy to apply.