Detailed sets of time-averaged surface pressure coefficients were recorded over the walls and roof of a rectangular building model, set in a simulated high density urban area. The 1/400 scale model represented a generalized smooth surfaced building of 100x150 ft plan form, whose height varied from 300 ft to 200,100 and 50ft. Surrounding roughness elements equalled the heightof the 50ft, building model. Tests were carried out at twelve wind angles using a power low velocity profile with an exponent of 0.43.
Describes methods of measuring the air tightness of whole buildings. Outlines three tracer gas methods; constant concentration; decreasing concentration and constant emission. Describes pressurisation method. Describes measuring equipment and test procedure and discusses calculation of ventilation rateand error magnitudes. Gives brief summary of measured results and an appendix contains a print-out of data on the airtightness of houses.
Presents results of measurements of fluctuating wind pressures on prisms of square and rectangular section mounted on the rooftop of a 4-storied building. Describes models and experimental methods. Finds pressure fluctuations of thewindward side are subject to the influence of wind turbulence. Negative pressure on leeward side is relatively stable exceptwhere strong vortices are being shed Very high negative pressures were observed intermittently along the edges of a top board.
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