Based on environmental excitation,the vertical vibration modal test of the irregular plane composite open-web sandwich plate structure was carried out by using time-domain modal fitting method,and the parameters such as the first four vertical vibration modes,natural frequency and damping ratio of the composite plate structure were obtained,and compared with the vibration modes calculated by the finite element software.The acceleration time history of human induced vibration of irregular plane composite open-web sandwich plate structure under six working conditions was tested,and the acceleration time history curves of different measuring points under each working condition and the acceleration peak values of corresponding measuring points were obtained respectively.The results show that the natural frequencies of the composite open-web sandwich plate obtained from field measurement and finite element analysis are much greater than 3Hz,and the error between them is within 5%.The floor damping ratio is less than 0.05.Under the most unfavorable working conditions,the maximum vertical acceleration peak value of irregular plane composite open-web sandwich plate is 0.036m/s2.The natural frequency and acceleration peak value of the plate meet the requirements of Technical specification for concrete structures of tall building(JGJ 3-2010)and Code for composite slabs design and construction(CECS 273-2010).The plate has good comfort when applied in the long-span irregular plane.
维普
万方数据