High Frequency GNSS Measurements for Structural Monitoring Applications

4noDynamic deformation monitoring of structures such as long bridges, towers, and tall buildings, for the purpose of determining structural vibrations, is possible using Global Navigation Satellite System (GNSS) (Lovse, J. W. et al., 1995). Starting from 1998, high frequency GNSS measurements have been performed at the Department of Civil Engineering, University of Trieste, Italy, on special civil engineering structures: chimneys, bridges, wind-power towers simulators for the analysis of dynamic behavior and structural vibration monitoring. Using 10, 20 and 50 Hz GPS and GPS+GLONASS receivers, different tests have been performed using simulators built on purpose for the experiments and in real conditions on high structures. A report of the tests performed on a 100 m chimney in Trieste, Italy during strong wind conditions from 1998 to 2002 and using a simulator of elliptical movements for applications to wind-powers vibrations monitoring, in the framework of Italian COFIN98 Aerogen Project, in the years 2008 – 2010, are herein reported.reservedmixedCefalo, Raffaela; Manzoni, Giorgio; Noè, Salvatore; Sluga, TatianaCefalo, Raffaela; Manzoni, Giorgio; Noe', Salvatore; Sluga, Tatian

Characterisation of pressure coefficients on hyperbolic paraboloid roofs

The necessity of covering large areas without intermediate supports requires the design of medium to large span roofs. Tensile structures made of cable nets represent, among other structural solutions, one of the technologies available to do this. They owe their appeal to lightness, cost-effectiveness and aesthetics. For these structures, however there is a lack of clear regulations concerning structural design, especially regarding assessment of environmental loads. This paper is part of an extensive research project on the behaviour of tensile hyperbolic paraboloid roofs. The first stage of the project developed a procedure for optimisation of their shapes during preliminary design. The second stage, the results of which are presented here, focused on characterisation of wind pressure distributions. The results of wind tunnel tests are discussed and synthesised in pressure coefficient maps. These can be used for design applications and lend themselves to implementation in Codes