摘要
采用计算机建模和分析、预测大跨度和大悬挑结构受到人群活动激励而产生的竖向响应是非常重要的课题。人群荷载激励下结构振动响应过程中,人体不仅是荷载激励也是振动参与者,结构振动具有明显的人-结构耦合特性。考虑人-结构耦合作用,区分不同行人密度、步行频率,并采用随机性人群荷载模型,计算某18m大悬挑拉索结构在人群步行荷载激励下的振动响应。结果表明,在端部悬挑区域内加速度响应均小于标准限值70.00mm/s^2,满足舒适度要求;以质量-弹簧-阻尼模型模拟考虑人-结构耦合作用后,人体阻尼用抑制了结构的竖向振动,结构的振动频率没有改变;人群荷载激励频率对结构振动的影响远大于行人密度、数量。
It is important to analyze and predict the vertical response of large span and large cantilever structures under human activities using computer modeling.When structure vibrate under pedestrian load excitation,human not only take part in as the incentives but also as participants involved in the vertical vibration,the structure vibration has Human-Structure Interaction effect obviously.The vibration response of the 18 meters large cantilever structure was analyzed under the crowd load by considering different person densities,different walking frequencies and crowd frequency under the condition of normal distribution with considering Human-Structure Interaction effect.The results show that the acceleration response of the cantilever area is less than the standard limit of 70.00 mm/s^2,meet the comfort level.The HSI system has not changed the vibration frequency after considering HSI effect by using mass-spring-damper model,and the damping of the people restrain the vertical vibration.The influence of incentives frequency is greater than the pedestrian density,quantity of the crowd load when the structure vibrate under the crowd load.
作者
马斐
Ma Fei(Shanghai Institute of Architectural Design&Research Co.,Ltd.,Shanghai 200041,China)
出处
《建筑结构》
CSCD
北大核心
2019年第A01期313-319,共7页
Building Structure
关键词
大悬挑拉索结构
人-结构耦合作用
人群荷载
正态分布
舒适度分析
large cantilever&cable stayed structure
human-structure interaction effect
crowd load
normal distribution
comfort analysis
