摘要
首先分析了单自由度等位移准则与结构屈服程度的关系,然后针对典型连续梁桥的特点,定义了名义屈服位移和名义延性系数,并通过改变主梁特性、桥墩特性和地震动输入等进行参数分析,将等位移准则由单自由度推广到多自由度。研究表明,当连续梁桥的主要振型的周期均大于对应单自由度等位移准则的周期下限,并且主要振型的质量参与系数之和超过90%时,非线性时程方法得到的位移与弹性反应谱方法得到的位移接近,等位移准则成立,可以采用弹性位移评估其非弹性位移。多自由度等位移准则的应用较大程度简化了相当一部分连续梁桥的横桥向位移需求的计算,为其基于位移的抗震设计提供了基础。
The relation between SDOF equal displacement criterion and yielding extent of structure was analyzed.The nominal yielding displacement and nominal yielding curvature were defined based on the traits of general continuous bridges.SDOF equal displacement criterion was then extended to MDOF on the basis of analyses on different kinds of continuous bridges with different girders,piers and earthquake inputs.The results show that the displacement calculated with inelastic time history method is close to that with...
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第11期100-103,206,共5页
Journal of Vibration and Shock
基金
国家自然科学基金(50578118)
交通部项目(200631882225)资助项目
关键词
连续梁桥
抗震分析
等位移准则
位移需求
基于位移
continuous bridges
seismic analysis
equal displacement criterion
displacement demand
displacement-based
seismic design
