巨型钢框架悬挂结构体系组合楼板振动性能试验及舒适度分析

Vibration Performance Test and Comfort Analysis of Composite Floor Slab of Giant Steel Frame with Suspended Structure System

目前国内外尚缺乏巨型钢框架悬挂结构体系的组合楼板振动试验与舒适度评价方法。为了揭示人致荷载激励下巨型钢框架悬挂结构体系组合楼板的振动特性及舒适度,依托中科院量子科研楼,开展了现场振动实测与分析。通过动力特性试验获悉楼板的频率分布,对楼板施加人致荷载激励和节律跳跃激励,着重分析了步频、人行数量、行走路线等主要因素对新型悬挂结构体系楼板振动舒适度的影响规律。试验结果表明:随着步频增大和行走人数的增加,楼板的峰值加速度逐渐增大;沿楼板宽度方向行走会引起明显振动响应;节律跳跃激励对楼板舒适度影响较大,使用时应避免过多的跳跃激励。结合国内外规范,对此楼板振动舒适度进行了评价与分析。研究建议,可采用主振频率和振动强度来评价该新型结构的楼板振动舒适度,即主振频率不小于3 Hz,振动强度不大于0.015 m/s^(2)。

At present,there is still a lack of vibration testing and comfort evaluation method for the composite floor slabs of the giant steel frame with suspended structure systems at home and abroad.In order to reveal the vibration characteristics and comfort of the composite floor slab of the giant steel frame with suspended structure system under the excitation of human-induced loads,on-site vibration measurement and analysis were carried out based on the research building of the Quantum Academy of the Chinese Academy of Sciences.The frequency distribution of the floor slab was obtained through the dynamic characteristic test;the human-induced load excitation and rhythm jump excitation were applied to the floor slab,focusing on the analysis of the influence of the main factors such as step frequency,pedestrian number,and walking route on the floor vibration comfort of the new suspended structural system.The test results showed that the peak acceleration of the floor slab gradually increased with the increase of the stride frequency and the number of people walking;walking along the width of the floor slab would cause a significant vibration response;rhythmic jump excitation has a great impact on floor comfort,and excessive jump excitation should be avoided when using it.Combining with domestic and foreign codes,this floor was evaluated and analyzed for vibration comfort.The research results showed that the main vibration frequency and vibration intensity could be used to evaluate the vibration comfort of the floor slab of the new structure,which meant that the main vibration frequency should not be less than 3 Hz,and the vibration intensity should not be greater than 0.015 m/s^(2).