Asuquo et al.: Community needs assessment of key populations-at-risk of HIV/AIDS in Nigeria's capital territory. BMC Infectious Diseases 2014 14(Suppl 2):P29.

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<p>This paper provides a state-of-the-art review of prefabricated mass timber floors, with a focus on composite floor assemblies for common residential and long-span office applications. The discussion relates to different design aspects, including connection systems and methods of assembly. Also, design methods and code provisions for the floor assemblies comprising ultimate limit state design, vibration control and long-term behaviour are expounded. A life-cycle overview of floor solutions is also presented to highlight their sustainability potential. The paper demonstrates how the building industry can leverage the structural performance, light weight and prefabrication capabilities of these innovative floor solutions for a better-built environment.</p>

Prefabricated mass timber-based floors are lightweight flooring alternatives gaining attention in building applications given their ease of erection, low carbon footprint and structural benefits in reducing the overall seismic mass and foundation requirements in buildings. However, in these floor archetypes, serviceability limit state requirements such as deflection and vibration performance often govern member sizing and layout design. In this paper, the vibration properties of one such flooring systema prefabricated cross-laminated timber (CLT) -steel hybrid floor, are examined at full-scale via modal and walking tests, considering variations in material properties, geometric configurations, support conditions, walking paths and walking frequencies. The test results indicate that the composite floor is a high-frequency system with a transient response. The study also provides valuable insight into the potential vibration performance of CLT-steel composite floors for residential applications. A prediction of its vibration serviceability via the vibration dose value method indicates that it has a low probability of attracting adverse comments from users in residential applications when a continuous slab is created by connecting its fundamental units using self-tapping screws.

<p>Timber-based composite floors are gaining ascendancy as potential competitors with mainstream steel-concrete composites due to the increasing emphasis on sustainability in the construction industry. This paper investigates the vibration serviceability performance of an innovative prefabricated timber-steel composite floor module. The floor features a cross-laminated timber (CLT) panel joined to cold-formed steel beams using self-tapping screws as shear connectors. The vibration response of the floor module is simulated through the finite element method considering both modal and transient analyses, and its structural performance is evaluated using criteria specified in international design codes and standards. The results provide insight into the vibration behaviour of steel-timber composite floors in residential applications.</p>