摘要
为了评价某拟建大跨度双斜塔钢箱梁斜拉桥的抗风安全性能,通过数值分析与风洞试验相结合的方法研究其结构动力特性,测定静力三分力系数、颤振临界风速和涡激振动响应,据此分析评估该桥的抗风性能。结果表明,该桥具有较好的气动和颤振稳定性,但存在两个明显的竖向涡激共振区,且最大振幅远超过规定容许值。因此,该桥需要通过气动外形优化,以减小或控制涡激振动。经多种主梁涡激振动性能优化方案对比试验得出其最优措施为轨道内侧增加一条宽1m、与底板夹角成30°的导流板。
In order to evaluate wind-resistant behavior of a double pylon cable stayed bridge with steel box beam,dynamic response characteristics of the bridge were analyzed.The aerostatic force coefficient,the critical wind velocity of vibration and vortex-induced vibration response were measured using the combined method of numerical analysis and wind tunnel test,to assess wind-resistant behavior of the bridge.The results showed that the aerodynamic and flutter stability characteristics were good,but there were two obvious vertical vortex-induced resonance regions,and the peak excursion was much larger than the allowable value.Therefore,the bridge needs an aerodynamic shape optimization to reduce or control vortex-induced vibration.By comparing a variety of optimization solutions given by vortex-induced vibration experiments,the most optimized measure for vortex-induced vibration control was to add a fair water fin of 1m wide and 30° incline to the bottom slab.
出处
《广西大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第4期605-610,共6页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(50808148)
关键词
斜拉桥
抗风性能
节段模型风洞试验
动力特性
cable stayed bridge
wind-resistant behavior
section model wind tunnel test
dynamic response
