Internal pressure characteristics of low-rise buildings due to wind action.

Reports wind tunnel measurements of the wind-induced internal pressures of models of low-rise buildings of different geometry and internal volume. Three different uniform porosities (0.0 0.5 and 3.0% of the total surface area) have been examined in combination with openings in a wall ranging from 0 to 100% of that wall's area. Two terrain roughnesses were used corresponding to open country and suburban regions.< Finds that internal pressures are variable but generally lower than local external pressures. For windward openings, internal pressure coefficients are generally positive with the exception of cases with high background porosity combined with small openings, when they become zero or slightly negative.