Dynamic behavior of reinforced concrete frame structure during construction

来源期刊：中南大学学报(英文版)2008年第3期

论文作者：田明革 易伟建

文章页码：418 - 422

Key words：structural dynamics; ambient vibration; structure during construction; mode shape; natural frequency; modal damping ratio

Abstract: The effects of concrete’s time-variant elastic modulus, casting structural components, assembling temporary shoring framework system, and shock by operating construction equipment on dynamic behavior of the reinforced concrete frame structure during construction were investigated. The dynamic tests of an eight-storey reinforced concrete frame structure during full-scaled stages of the sixth storey construction cycle were carried out by ambient vibration. Natural frequencies, corresponding mode shapes and damping ratio were determined by power spectrum processing the tested signal data in frequency domain. The changes of frequencies, mode shapes and damping ratios at different construction stages were given. The results show that natural frequencies and modal damping ratios reach the maximum at stage of casting fresh concrete, especially for higher modes. Modal damping ratios at each construction stage are less than 5% of those during usage.

基金信息：the National Natural Science Foundation of China