桥梁结构抗震设计中截面刚度的取值分析

Analysis of Section Stiffness Adopted in Seismic Design for Bridge Structures

目前我国桥梁抗震设计规范对钢筋混凝土桥墩的截面弹性刚度取值没有统一的规定 ,一般取毛截面刚度来作为截面的弹性刚度 ,这与合理的取值之间有较大的差异 .在结合国外最新研究成果的基础上 ,对桥梁结构基于强度抗震设计中采用毛截面刚度所引起的误差进行了分析 ,并建议了一种基于截面弹性刚度合理取值的强度抗震设计方法 .

Now values for section elastic stiffness of reinforced concrete bridge piers are not uniformly prescribed in Chinese codes for bridge seismic design, and generally the gross section stiffness is adoped as the section elastic stiffness, which is quite different from the proper section elastic stiffness. Based on the latest research abroad, the error caused by using gross section stiffness in force-based seismic design for bridge structures is analyzed in this paper. Finally a force-based seismic design method based on the proper section elastic stiffness is suggested.