Asko Talja

Classification of Human Induced Floor Vibrations

This paper summarizes results from vibration tests on floors. Classification of floors into five headings is given based on vibration characteristics. Suggested criteria and limiting values are proposed. These values are based on tests carried out on site and in laboratory conditions. It was found that the point load deflection is the best indicator for floor vibration design, when the fundamental frequency is higher than 10 Hz. It is further suggested that the deformation caused by the point load is divided into a local deflection mainly caused by soft toppings and floating floors and a global deflection of the main floor joists.

Current R&D work on the use of stainless steel in construction in Finland

Abstract The key questions in the R&D work in Finland have been: How the increased strength due to cold-forming in structural hollow sections can be used in practice and possibly in some shell structures as well, and how the good fire resistance properties of some types of stainless steels can be used in practice. This report summarises the main results of the R&D work that has been carried out in VTT Building Technology since 1993. The utilisation of good mechanical properties of RHS-sections from austenitic stainless steels both in room and at elevated temperatures are discussed. The design of cylindrical shells from austenictic stainless steel under meridional compression is also considered.