跳跃荷载下大跨楼盖的振动加速度反应谱

Acceleration Response Spectrum for Predicting Floor Vibration Subjected to Occupants Jumping

摘要:

利用实测92人次506条跳跃荷载记录，计算每条记录的单自由度系统加速度峰值及10 s和1 s移动均方根峰值等反应谱曲线，并在此基础上提出了面向工程设计的反应谱表达式.由试验数据的分析获得了不同阻尼比和保证率下的反应谱参数及不同响应代表值间的转换关系.结合振型分解反应谱思想，可由建议反应谱计算单人跳跃下楼盖的动力响应.通过与模型试验和工程实测的对比验证了反应谱方法的可行性，可用于楼盖的振动舒适度设计.

Abstract:

The acceleration response spectrum for predicting floor vibration subjected to single person’s jumping load was investigated. Five hundred and six jumping load records from ninety two test subjects were collected by experiments. Each record was then applied to single degree of freedom system to calculate the corresponding peak, 10 s and 1 s running root mean square (RMS) acceleration responses spectra, on which a design oriented spectrum was developed. Spectrum parameters were determined by statistical analysis on the experimental records. These parameters can be calculated by given structural damping ratios and confidence levels. Furthermore, conversion rules between different vibration quantities, i.e. peak and RMS, were established. Finally, the applicability and reliability of the proposed design spectrum were validated by comparing its perditions with experimental and field measurements. The comparison shows that the suggested design spectrum can be used to predict the maximum acceleration response of floors subjected to one person jumping.