摘要
文章基于结构动力响应分析及模态分析理论,推导了大跨度桥梁模态贡献度系数和最优时间步长计算公式,并编写相应的计算程序。针对普立特悬索桥的结构特点,计算分析其模态贡献度系数及相应的优化时间步长Δt,再将其引入普立特悬索桥在风荷载作用下的抖振时域响应分析。计算结果表明,采用优化时间步长Δt=0.05计算得到的各方向抖振响应均沿平衡位置上下波动,顺风向比垂直向位移响应大4倍左右。通过对比分析可知,采用优化的时间步长使计算结果在精度和效率上得到很好的保证,为普立特悬索桥的抗风分析提供了依据,可供同类结构精细化的动力分析做参考。
Based on the structural dynamics analysis method and modal analysis theory, the modal con- tribution coefficients and optimal time step for long-span bridge are derived. For Pulite Bridge, the modal contribution coefficients and optimal time step △t of this bridge are first obtained based on its structural characteristics. Then the buffeting response of this bridge under wind loading in time domain is further calculated by using them. The results show that when optimal time step △t equals to 0.05, the buffeting response of this bridge varies around equilibrium position for each direction, and the buffeting response in along wind direction is about four times larger than that in vertical direction. Through the comparison with other time step, it can be known that the calculation with optimal time step At can give good results in accuracy and efficiency. This research can provide a basic reference for the delicate wind-resistant analysis of Pulite Bridge and other similar bridges.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第1期122-127,共6页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学青年基金资助项目(51408174)
安徽省自然科学青年基金资助项目(1408085QE95)
中国博士后科学基金第54批面上资助项目(2013M540511)
中央高校基本科研业务费专项资金资助项目(2013HGBH0037)
关键词
模态贡献度系数
优化时间步长
大跨度桥梁
抖振响应
modal contribution coefficient
optimal time step
long-span bridge
buffeting response
