TB-Lecture09-ASCE-7-Wind-Simplified

TB-Lecture09-ASCE-7-Wind-Simplified - © L Prieto-Portar...

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Unformatted text preview: © L. Prieto-Portar - 2008 EGN EGN-5439 5439 The Design of Tall Buildings The Design of Tall Buildings Lecture 09 Lecture 09 ASCE 7 ASCE 7-- 02 Solved Problem #2: 02 Solved Problem #2: Analytical Method 1 Analytical Method 1 – – The Simplified Procedure. The Simplified Procedure. In order to illustrate the calculations of the wind design pressures using ASCE 7-02, Method 1, The Simplified Procedure , we will use the same office-warehouse building of Example #1 shown in Lecture 08. Example #2 also uses the warehouse building 50 feet wide, 100 feet long and 20 feet high, located in downtown Tampa. The text for the Simplified Procedure is given in ASCE 7-02, Section 6.4.1, page 26. SECTION 6.4. METHOD 1—SIMPLIFIED PROCEDURE 6.4.1 Scope. A building whose design wind loads are determined in accordance with this Section shall meet all the conditions of 6.4.1.1 or 6.4.1.2. If a building qualifies only under 6.4.1.2 for design of its components and cladding, then its main wind force-resisting system shall be designed by Method 2 or Method 3. 6.4.1.1 Main Wind Force-Resisting Systems. For the design of main wind force-resisting systems the building must meet all of the following conditions: 1. The building is a simple diaphragm building as defined in Section 6.2; 2. The building is a low-rise building as defined in Section 6.2; 3. The building is enclosed as defined in Section 6.2 and conforms to the wind-borne debris provisions of Section 6.5.9.3; 4. The building is a regular shaped building or structure as defined in Section 6.2; 5. The building is not classified as a flexible building as defined in Section 6.2; 6. The building does not have response characteristics making it subject to across-wind loading, vortex shedding, instability due to galloping or flutter; and does not have a site location for which channeling effects or buffeting in the wake of upwind obstructions warrant special consideration; 7. The building structure has no expansion joints or separations; 8. The building is not subject to the topographic effects of 6.5.7 (i.e., K zt = 1 . ); 9. The building has an approximately symmetrical cross section in each direction with either a flat roof, or a gable or hip roof with & & 45 degrees. 6.4.1.2 Components and Cladding. For the design of components and cladding the building must meet all the following conditions: 1. The mean roof height h & 60 feet ; 2. The building is enclosed as defined in Section 6.2 and conforms to the wind-borne debris provisions of Section 6.5.9.3; 3. The building is a regular shaped building or structure as defined in Section 6.2; 4. The building does not have response characteristics making it subject to across-wind loading, vortex shedding, instability due to galloping or flutter; and does not have a site...
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TB-Lecture09-ASCE-7-Wind-Simplified - © L Prieto-Portar...

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