大跨度桥梁结构有限元抗震分析的多点输入法

Multi-Point Input Method of Finite Element Earthquake-Proof Analysis for Long-Span Bridge Structure

本文考虑地震动场的空间相关性 ,对大跨度桥梁结构在多点输入地震作用模式下的抗震分析方法进行了研究。该法由响应量幅值的平方直接求得特定频率点 ,该响应量的功率谱值 ,进而可求得其均方值等统计特性 ,与传统的均匀输入法相比 。

The paper considers the space interrelation of the earthquake moving yard and study on the earthquake proof analysis method of long span bridge structure under the mode of multipoint input earthquake reaction.The method obtains directly the power spectral values of the response variable of the specific frequency point by the square of the response variable amplitude value.So it can obtain the statistical characteristics such as the mean square values etc.In the comparison with traditional even input method,the increased working volume is not large,but it is more sui table to the engineering practice.