Wind load and wind-induced response estimations in the Recommendations for loads on buildings, AIJ 1993

The Recommendations for Loads on Buildings of the Architectural Institute of Japan (AIJ) was updated in June 1993. Separate wind-load estimations are required for main resisting systems and components and cladding. Two different calculation formulae are prepared for wind loads of main resisting systems: one is for the horizontal along-wind load and the other for the roof load. Three procedures with different accuracy are able to be selected by designers: the simplified procedure for low-rise small buildings, the detailed procedure I for middle-height rigid buildings and detailed procedure II for high-rise flexible buildings. Additionally, estimation of the across-wind and torsional loads is necessary for wind-sensitive buildings. Special load estimations for aeroelastic instabilities are also required for particularly slender and flexible buildings. All provisions are expressed only in equations, without any diagrams.