摘要
利用等效线性化方法将钢筋混凝土(RC)连续梁桥结构简化为多自由度线弹性体系,采用振型反应谱的概念研究了结构在横向地震作用下考虑多阶模态效应的直接基于位移的抗震设计方法。探讨了连续梁桥的上部结构(主梁)及桥墩(台)刚度的变化对结构横向振动模态质量与模态周期的影响,给出了多阶模态设计方法的具体设计过程。对对称与非对称连续梁桥采用相同的设计步骤进行基于位移的抗震设计,并对设计算例用非线性时程分析验证了设计结果的合理性。
The reinforced concrete continuous girder bridges are simplified as the MDOF elastic system by using equivalent elastic method. On the basis of elastic response spectrum-based approach including the effects of higher modes, authors present the direct displacement-based seismic design method for RC continuous girder bridges, which is applied to the transverse response of bridge structures. The effects of stiffness variation of main beams and bridge columns or abutments on the modal mass and periods of transverse vibration are discussed, and the detailed design procedure of the proposed method is outlined. The displacement-based seismic design for the symmetrical and asymmetrical continuous bridges is studied by using the same design procedure, and the design results of respective examples are analyzed and checked by using dynamic inelastic time-history analysis in order to clarify the reasonableness of design results.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2005年第2期28-33,共6页
China Journal of Highway and Transport
基金
国家自然科学基金项目(59978001)
国家自然科学基金项目(50278002)
关键词
桥梁工程
抗震设计
反应谱方法
多阶模态效应
非线性时程分析
bridge engineering
seismic design
response spectrum-based approach
effect of higher mode
nonlinear time-history analysis
