1.051 Structural Engineering Design Prof. Oral Buyukozturk Fall 2003 1.051 Structural Engineering Design Recitation 1 CALCULATION OF WIND AND EARTHQUAKE LOADS ON STRUCTURES ACCORDING TO ASCE 7 & IBC WIND LOADS Buildings and their components are to be designed to withstand the code-specified wind loads. Calculating wind loads is important in design of the wind force-resisting system, including structural members, components, and cladding, against shear, sliding, overturning, and uplift actions. Wind Load Calculation Procedures The design wind loads for buildings and other structures shall be determined according to one of the following procedures: (1) Method 1 – Simplified procedure for low-rise simple diaphragm buildings (2) Method 2 – Analytical procedure for regular shaped building and structures (3) Method 3 – Wind tunnel procedure for geometrically complex buildings and structures Method 1 – Simplified Procedure The simplified procedure is used for determining and applying wind pressures in the design of simple diaphragm buildings with flat, gabled, and hipped roofs and having a mean roof height not exceeding the least horizontal dimension or 60 feet (18.3 m), whichever is less, and subject to additional limitations. Following are the steps of the simplified procedure: 1. Determined the basic wind speed , V , in accordance with ASCE 7 Figure 6-1 or IBC Figure 1609, assuming the wind can come from any direction. ASCE 7 6.5.4 includes some provisions for the special wind regions indicated, near mountainous terrain, and near gorges. 2. Determine the importance factor , I , in accordance with ASCE 7 Table 6-1 & Table 1- 1, or with IBC Table 1604.5. 3. Determine the exposure category in accordance with ASCE 7 Section 6.5.6 or IBC Section 1609.4. 4. Determine the height and exposure adjustment coefficient , λ , from ASCE 7 Figure 6- 2 or IBC Table 1609.6.2.1 (4) 5. Determine 30 S p , the simplified wind pressure for exposure B , at h =30 ft, for I =1.0, from ASCE 7 Figure 6-2 or IBC Table 1609.6.2.1. 1
1.051 Structural Engineering Design Prof. Oral Buyukozturk Fall 2003
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