Assessment of Vibration Serviceability of As-built Concrete Floors and the Appropriate Span

New requirement for vertical vibration seviceability check for long-span concrete floor is one of the important improvements in the latest design code GB 50010—2010.As a result,whether or not the existing concrete floors satisfy the requirement,and how to quickly assess the suitable span for a concrete floor in the design stage are two problems that need to be addressed.To this end,28 existing concrete floors have been selected from more than 300 samples.The vertical vibration frequency of the selected floors was checked against the new code.The results show that all the floors satisfy the vibration seviceability requirement,implying thoe for normal concrete floor(span 25 m) if its design satisfis the defleation and cracking requirement the vibration serviceability requirement will be automaticalling satisfzed.Finally,based on the contimtion beam model and the limitations of deflection,the paper suggeses an simplified assessment method for determining floor span that satisfies vibration serviceability requirement.