Experimental study on vertical vibration performances of large-span metal plate connected timber truss joist floors
In order to study the human-induced vibration response of metal plate connected timber truss joist floor,a full scale test was carried out on the vibration performance of 12m span metal plate connected timber truss joist floor.The effects of the cross brace and partition wall on the vibration performance and stiffness of timber floor were analyzed,and the vibration response of timber floor under single walking load and free fall impact load was analyzed.The results show that the first three vibration modes of the timber floor meet the expectation.The basic natural vibration frequency of the single span timber floor is below 8Hz,which is lower than the basic natural vibration frequency of the continuous span timber floor.The frequency of the first three levels of timber floor can be increased by installing cross brace and setting partition wall.The stiffness of timber floor increases,and static deflection reduces after incorporating cross brace at different positions.Static deflection at the center of timber floor is reduced by 47.5%when 4 rows of cross brace are added.The vibration response of timber floors to human-induced loads in different directions varies slightly,with a larger response in the longitudinal direction and a smaller response laterally.The vibration response at the center of timber floor is reduced by 40%after introducing partition wall.The longitudinal vibration transmission of timber floor surpasses that in horizontal and oblique directions.The setting of partition wall can enhance the vibration transmission of timber floor.
NETL
NSTL
万方数据
维普
