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Profiled composite floors (ribbed concrete slabs on corrugated steel decks) are commonly used in steel framed buildings. However, complicating the dynamic modeling of such floors is their apparent stiffness anisotropy due to the periodically spaced ribs. In this paper, approaches are presented to obtain the effective, flat-plate properties of composite floors to predict floor vibrations for two building case studies. Measured floor vibrations for the case studies are then compared to the models. [ABSTRACT FROM AUTHOR]

ACRP Research Report 175 (ACRP 175) was published in 2018 and provides basic guidelines for design, installation, and operation of public address systems in airport terminals. There are approximately 400 airports in the US, and with over 550 underground transit stations and 2,600 above ground transit stations in the US, many of these guidelines developed for airports can also be easily adapted for these stations. This paper provides an overview of ACRP 175 guidance with a focus on key factors for successful design and commissioning. As part of the research, acoustic field studies were performed at six airports and a total of 45 different spaces including ticketing, concourse, gate lounges, food courts, arrival/departure halls, baggage claim, and curbside locations. We describe experience using ACRP 175 on current design-build projects and discuss other relevant industry standards. [ABSTRACT FROM AUTHOR]