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Timestamp: 2019-03-26 18:38:59
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﻿ ASCE 7-10 wind load
ASCE 7-10 Wind load calculation:
Basics in ASCE 7-10
ASCE 7-10 change wind load calculaltion from service design wind load to strength design wind load..
ACSCE 7-10 covers wind load from chapter 26 to 31 as follows:
Chapter 26 - General requirements - It includes three wind maps for categories I, II, III and IV. for basic wind speed, V, wind directionality factor, Kd, exposure categories and constants, topographic effects (Kzt), gust response factor, G, enclosure classification, and internal coefficient (GCpi), etc.
Chapter 27: Wind load on Buildings - MWFRS (directional procedure) - Part 1: Wind load on building for all height - it includes velocity pressure equation, design wind pressure equation , parapmeter, Kz, Kh, Cp, CN, Part 2: Wind load on simple diaphragm with h = or <160 ft - includes wind pressure tables for exposure B, C, and D.
Chapter 28 - Wind load on Buildings - MWRFS (Envelope Procedure) - Part 1: Wind pressure on low rise building with windward, leeward, and side walls pressure. Part 2: Simplified design wind pressure tables for low-rise enclosed buildings.
Chapter 29 - Wind loads on other structures and building appurtenances - MWFRS - Wind pressure calculations for signs, chimneys, tanks, roof top equipment, lattice frameworks, trussed towers.
Chapter 30 - Components and Cladding (C & C) - Part 1: Low-rise buildings. Part 2: Low-rise building (simplified). Part 3: Building with h > 60 ft. Part 4: building with h = or < 160 ft. Part 5: Opening buildings. Part 6: building appurtenances, rooftop structures and equipments.
Chapter 31 - Wind tunnel procedure
Basic wind speed: (for strength design)
ASCE 7-10 removes important factor Iw from wind load equation from ASCE 7-05 and replaces it with three different wind maps.
Basic wind speed in U.S. is shown in wind hazard map:
Figure 26.5-1A. - Basic wind speeds for Occupancy Category II building and other structures
Figure 26.5-1B - Basic wind speeds for Occupancy Category III and IV buildings and Other Structures
Figure 26.5-1C - Basic wind speeds for Occupancy Category III and IV buildings and Other Structures
The basic wind speed is basic on statistical data collected from airport across U.S. The wind speeds correspond to 3-second gust speeds at 33 ft above ground for exposure C category. The wind speeds represent 50-year return period.
Wind hazard map can be found on IBC website Chapter 16, section 1609.
A distinction was made surface roughness categories and exposure categories. Interpolation between exposure categories is permitted by rational analysis. Wind is to be evaluated in the worst case of the two 45-degree sectors either side of the wind direction.
Wind load calculation (7-05)