摘要
使用大型通用有限元软件AN SY S建立了某桥的成桥阶段和施工最不利阶段的有限元模型,分析了模型的动力特性.根据POD型的谱表示法模拟了桥梁的脉动风速场并进行了相关性拟合检验,然后基于准定常理论计算了作用在模型上的抖振力时程.最后由HHT方法进行时程分析,分别求得了两种模型的抖振时域分析的结果,据此有效地评价了桥的抗风性能.
By using the general finite element analysis （FEA） software ANSYS the finite element model are established for a bridge including the post-eonstruction stage and the longest twin-eantilever eonstruetion. Dynamie eharaeteristics of the two models are surveyed. By employing the POD-based spectral representation method, the turbulent wind-velocity field around the bridge is simulated and verified. Then, the buffeting force sequences, which can be applied to the models, are computed on the basis of the quasi steady aerodynamic theory. Finally, the results of the time-domain buffeting analysis for the two＇ models are obtained by carrying out the time-history analysis. Thus,the windresistant design for the bridge ean be conducted.
出处
《华中科技大学学报（城市科学版）》
CAS
2006年第1期1-4,共4页
Journal of Huazhong University of Science and Technology
基金
交通部西部交通建设科技项目(200431800024)
关键词
大跨桥梁
风场模拟
POD型谱表示法
抖振时域分析
long-span bridge
wind field simulation
POD-based spectral representation method
time domain buffeting analysis
