摘要
为克服CCIP-016和SCI P354两个楼板振动舒适度设计指南的动载因子保证率不同而导致的结构反应计算结果不同,提出基于随机步行荷载和烦恼率的楼板振动舒适度评价方法。考虑步行荷载各参数的随机性,生成随机步行荷载时程,经过大量时程分析得到结构最大均方根加速度反应的累积概率分布,结合现行舒适度标准,计算烦恼率期望值,进行舒适度评价。计算结果表明,采用CCIP-016或SCI P354计算得到的最大均方根加速度发生的概率很小,利用结构人致振动反应的代表值进行舒适度评价是不合适的。该方法基于概率方法,不考虑动载因子的保证率,较采用单一结构反应值进行舒适度评价更有说服力。
In order to overcome the problem induced by different exceeding probability of dynamic load factors used in two design codes of CCIP-016 and SCI P354, vibration serviceability assessment method for floor structures based on random walking force and annoyance rate was proposed. Randomness of parameters in walking force was taken into account to construct random walking force time histories, and then the cumulative probability distribution of the maximum RMS （root mean square ） acceleration responses of the structure was found through a large number of time history analyses. Then, the vibration serviceability of the structure was assessed using expectation of annoyance rate. The calculation results of an actual structure showed that the maximum RMS acceleration responses obtained with CCIP-016 and SCI P354 have a small probability of occurrence, so they are not suitable as the representative values of human-induce vibration. The proposed method was built on the basis of probability, and had no relationship with the exceeding probability of dynamic load factors, so it was more convincing than the present methods.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第22期71-75,95,共6页
Journal of Vibration and Shock
基金
国家自然科学基金重点项目(50938001)
关键词
振动
舒适度评价
随机步行荷载
烦恼率
vibration
vibration serviceability assessment
random walking force
annoyance rate
