Vibration Performance Assessment of an As-built Long-span Concrete Floor through Field Measurements
In this study, we have carried out in-situ tests on a long-span concrete floor whose structural system is very unique.Three types of excitation have been considered in the tests, which are ambient vibration, con trolled human activities (such as single people walking, a group of people walking and people jumping) and operational condition.The natural frequencies and damping ratios are identified using ambient vibration measurements.The root-mean-square (RMS) values of the acceleration time histories measured in opera tional conditions have been calculated and compared with the acceptable level specified in some design guidelines.It is found that the natural frequency of the floor is lower than the common threshold value in the design code.Under different loading conditions the pattern and amplitude of the acceleration response of the floor are different.The transient response at a location near the excitation might exceed the threshold value,but the RMS values are all smaller than the limitations.It is suggested that the vibration amplitude control is much more important than frequency control for vibration service ability design of long-span concrete floors.
Jun Chen Wei Liu Shixin Yan Ruotian Xu
Department of Building Engineering, Tongji University, Shanghai, China
国际会议
哈尔滨
英文
848-856
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）