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dynamiC Wind lOading

dynamiC Wind lOading analysis fOR PtB ROOf stRuCtuRe design dynamic wind loading is in many cases a governing parameter in the design of the primary and secondary structural support systems of the roof of the PtB. cost efficient design of these components requires reliable quantification of these loading factors. Boundary layer wind tunnel testing based on high frequency pressure integration (hFPi) techniques allow accurate determination of critical loading scenarios accounting for the structural stiffness of the roof. in particular, this technique allows detailed analysis of structural load effects such as net uplift / downforce and vertical shear cases based on structural influence lines thereby delivering loading scenarios for structural design which are substantially less conservative than applicable codes of practice. Bmt operates state of the art custom-built 1152 channel simultaneous lowrange pressure scanning system that allows unsteady external pressure fields to be measured to a high degree of spatial resolution. wind tunnel data can be reanalysed iteratively for different structural parameters such as stiffness and damping as the design evolves eliminating the need for repeat testing allowing for efficient tuning of the structural system. dynamiC ResPOnse analysis fOR atCt design dynamic wind loading is a governing parameter in the design of the foundations and the superstructure of atct structures. cost efficient design of these components requires reliable quantification of these wind parameters. Boundary layer wind tunnel testing based on high frequency force balance (hFFB) techniques allow accurate determination of critical loading scenarios accounting for the structural stiffness of the atct. Bmt are able to employ force balance testing technology coupled to sophisticated on-line data analysis software, which allows designers at an early stage in the design to interactively and cost effectively support architectural form finding and structural concept studies through accurate wind loading analysis. wind tunnel data can be reanalysed iteratively for different structural parameters as the design evolves eliminating the need for repeat testing allowing for efficient tuning of the structural system. ATCT Wind Tunnel Model PTB Pressure Model Pressure Distribution for Structural Design dynamiC ResPOnse analysis fOR atCt design COnt the requirement to constrain wind induced building sway to perceptible levels that are acceptable from an air traffic controller comfort perspective often drives the design of the lateral stability systems of the atct, particularly because vortex induced vibration (viv) can be highly significant for these type of structures. hFFB testing techniques can deliver accurate quantification of peak sway and provide an assessment of acceptability relative to industry standard comfort criteria for atct structures. these analysis techniques allow iteration between key performance parameters of the structural system such as building stiffness, mass and damping and dynamic wind responses to progressively derive the optimum configuration. in cases where auxiliary damping systems are required to limit building sway full aerolastic modelling techniques may be employed to validate the performance of these damping systems. Acceleration Criteria Cladding PRessuRe analysis fOR façade design cladding pressures on glazed facades and roof-cladding systems can be accurately measured using detailed small-scale wind tunnel models Vortex Shedding Spectra instrumented with pressure taps. internal pressures can be quantified using computational internal airflow models. sophisticated 3d contouring software providing animated on-line presentation of surface pressure data for complex external building form allows the façade pressures to be effectively displayed in a way that is easily digested into cost effective façade/cladding system design by façade contractors. ATCT Pressure Model Pressure Contours Pressure Contours Tel: +44 20 8614 4400 Fax: +44 20 8943 3224 Email: enquiries@bmtfm.com Website: www.bmtfm.com

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