Abstract
Wind - induced internal pressures which are relevant to wind loads on cladding were investigated. Wind loads on cladding are said to be estimated as the difference between external wind pressure and internal pressure on the cladding. It is not actually so simple, in case that the pressures vary in time. The fluctuation components of the pressures are taken into the consideration in examining the evaluation method. As the results, the new formula for the gust response factor of internal pressure is derived.
The dynamic pressure transition characteristics of opening are checked by the method of Saathoff, et al. The evaluation method of rms internal pressure based on the idea of pneumatic averaging manifold system is proposed. Applying the method to 7 building models with and without dominant openings in their external walls, internal gust response factors are calculated. The ratio of the areas of dominant openings to gross area for the wall in cases with dominant walls is varied on the calculation. Products of internal pressure coefficient and gust response factor of internal pressure of the building models are also calculated. By summarizing the results, values of products of internal pressure coefficients and gust response factors on cladding design are proposed.
