Asce 7 10 Chapter 30 Pdf
Chapter 11 SEISMIC DESIGN CRITERIA 11.1 GENERAL 11.1.1 Purpose. As described in Chapter 15, are also within the scope and shall be designed and constructed in accordance with the requirements. 110 ASCE 7-05. P1: JsY ASCE003-11.tex ASCE003/SIE-v1.cls September 29, 2005 17:5. NCSEA Webinar –ASCE 7-10 Changes in Wind Load Provisions 30 700 Year RP Winds Notes: 1. Values are nominal design 3-second gust wind speeds in miles per hour (m/s) at 33 ft (10m) above ground for Exposure C categ ory. Linear interpolation between contours is permitted.
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ASCE 7-10 Wind Loads Ronald Cook1, Larry Griffis2, Peter Vickery3, Eric Stafford4 1 Civil and Coastal Engineering, University of Florida, Structures Division, Walter P. Moore and Associates, 3 Applied Research Associates, 4 T. Eric Stafford & Associates, 2 ABSTRACT ASCE 7-10 “Minimum Design Loads for Buildings and Other Structures” contains several changes regarding wind loads.
The major editorial change is a complete reorganization to a multiple-chapter format as done previously for seismic loads with the objective being to make the provisions easier to follow. Technical changes include the introduction of new wind speed maps to be used with a 1.0 load factor for LRFD and a 0.6 load factor for ASD, the reintroduction of Exposure D for water surfaces in hurricane-prone regions, and revised wind-borne debris regions. A new simplified procedure for buildings up to 160 ft has been added based on the provisions for buildings of all heights. INTRODUCTION The major changes to the wind load provisions of ASCE 7 introduced in ASCE 7-10 are: • • • • • Reorganization of wind load provisions Wind speed maps Re-introduction of Exposure D in hurricane-prone regions Wind-borne debris region Simplified procedure for buildings ≤ 160 ft This paper presents a general background on the basis for these changes.
Thirty other changes related to wind loads were included in ASCE 7-10. The majority of these changes were editorial but some did include technical changes. These include: • • • • Minimum wind loads Improved exposure and roughness examples Revisions to low-rise “envelope” method Rooftop equipment REORGANIZATION OF WIND LOAD PROVISIONS The wind load provisions of Chapter 6 in ASCE 7 have been reorganized into 6 new Chapters. In recent years, there has been much discussion about the layout and presentation of the wind load provisions in ASCE 7. While, ASCE 7-98 did make some improvements to the format (introduction of the 3 Methods), much of the important information was buried deep within the paragraph numbering.