ASCE 41457-2018 Significant Changes to the Minimum Design Load Provisions of ASCE 7 C16.pdf

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1、Significant Changes to the Minimum Design Load Provisions of ASCE 716 Gary Chock S. K. Ghosh Michael ORourke T. Eric StaffordSignificant Changes to the Minimum Design Load Provisions of ASCE 7-16Other Titles of Interest ASCE 7 Hazard Tool. (ASCE, 2017). Delivers a quick, efficient way to look up key

2、 design parameters specified by Standard ASCE/SEI 7-10 and 7-16 through a web-based application that retrieves load data for each of seven hazards, visualizes them on a map, and generates a unified report of results. (https:/asce7hazardtool.online/) ASCE 7 Online. (ASCE, 2017). Provides digital acce

3、ss by subscription to both ASCE 7-10 and 7-16 versions of Minimum Design Loads and Associated Criteria for Buildings and Other Structures. Exclusive features include: side-by-side view of Provisions and Commentary; redlining; real-time updates; annotation and sharing tools; robust searching; and tog

4、gling between customary and metric units. (http:/asce7.online) Minimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/ SEI 7-16. (ASCE Standard, 2017). Provides requirements for general structural design and includes means for determining dead, live, soil, flood, wind,

5、 snow, rain, atmospheric ice, and earthquake loads and their combinations that are suitable for inclusion in building codes and other documents. A detailed commentary of explanatory and supplementary information is included. (ISBN 978-0-7844-1424-8) Snow Loads: Guide to the Snow Load Provisions of A

6、SCE 7-16, by Michael ORourke, Ph.D., P.E. (ASCE Press, 2017). Sets forth a detailed and authoritative interpretation of the snow load provisions of Minimum Design Loads and Associated Criteria for Buildings and Other Structures, Standard ASCE/SEI 7-16. (ISBN 978-0-7844-1456-9) Visit http:/www.asce.o

7、rg/asce-7/ for a complete list of products associated with the ASCE 7 Standard. * Significant Changes to the Seismic Load Provisions of ASCE 7-10: An Illustrated Guide, by S. K. Ghosh, Susan Dowty, and Prabuddha Dasgupta. (ASCE Press, 2011). Describes the revisions to the seismic requirements set fo

8、rth in Standard ASCE/SEI 7-10. (ISBN 978-0- 7844-1117-9) Significant Changes to the Wind Load Provisions of ASCE 7-10: An Illustrated Guide, by T. Eric Stafford. (ASCE Press, 2010). Summarizes changes to the wind load requirements set forth in Standard ASCE/SEI 7-10. (ISBN 978-0-7844-1116-2)Signific

9、ant Changes to the Minimum Design Load Provisions of ASCE 7-16 Gary Y. K. Chock, P .E., D.CE S. K. Ghosh, Ph.D. Michael ORourke, Ph.D., P .E. T. Eric Stafford, P .E.Library of Congress Cataloging-in-Publication Data Names: American Society of Civil Engineers, author. | Chock, Gary, author. Title: Si

10、gnificant changes to the minimum design load provisions of ASCE 7-16 / Gary Y .K. Chock, P .E., D.CE, S.K. Ghosh, Ph.D., Michael ORourke, Ph.D., P .E., T. Eric Stafford, P .E. Description: Reston, Virginia : ASCE Press, 2018 | Includes bibliographical references and index. Identifiers: LCCN 20170478

11、30| ISBN 9780784414576 (soft cover : alk. paper) | ISBN 9780784480229 (PDF) Subjects: LCSH: Structural engineering-Standards-United States. | Buildings-Standards-United States. | Strains and stresses. | Loads (Mechanics) Classification: LCC TH851 .A44 2018 | DDC 624.1/72021873-dc23 LC record availab

12、le at https:/lccn.loc.gov/2017047830 Published by American Society of Civil Engineers 1801 Alexander Bell Drive Reston, Virginia 20191-4382 www.asce.org/bookstore | ascelibrary.org Any statements expressed in these materials are those of the individual authors and do not necessarily represent the vi

13、ews of ASCE, which takes no responsibility for any statement made herein. No reference made in this publication to any specific method, product, process, or service constitutes or implies an endorsement, recommendation, or warranty thereof by ASCE. The materials are for general information only and

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15、r utility of any information, apparatus, product, or process discussed in this publication, and assumes no liability therefor. The information contained in these materials should not be used without first securing competent advice with respect to its suitability for any general or specific applicati

16、on. Anyone utilizing such information assumes all liability arising from such use, including but not limited to infringement of any patent or patents. ASCE and American Society of Civil EngineersRegistered in U.S. Patent and T rademark Office. Photocopies and permissions. Permission to photocopy or

17、reproduce material from ASCE publications can be requested by sending an e-mail to permissionsasce.org or by locating a title in the ASCE Library (http:/ascelibrary.org) and using the “Permissions” link. Errata: Errata, if any, can be found at https:/doi.org/10.1061/9780784414576. Copyright 2018 by

18、the American Society of Civil Engineers. All Rights Reserved. ISBN 978-0-7844-1457-6 (print) ISBN 978-0-7844- 8022-9 (PDF) Manufactured in the United States of America. 24 23 22 21 20 19 18 17 1 2 3 4 5V Table of Contents Table of Contents VSignificant Changes to the Minimum Design Load Provisions o

19、f ASCE 7-16 Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of Contents TABLE OF CONTENTS Part I - General Requirements and Load Combinations Scope 1.1, C1.1 2 Performance-Based Procedures 1.2, 1.3.1.3 5 Fire Resistance 1.3.7, Appendix E . 8 Part II - Dead and Live Loads

20、 Weight of Fixed Service Equipment 3.1.1, 3.1.3 . 12 Vegetative and Landscaped Roofs 3.1.4, Table 4-1 14 Solar Panels (DL and LL) 3.1.5, 4.17 17 Definitions 4.1 19 Minimum Uniformly Distributed Live Loads, L o , and Minimum Concentrated Live Loads Table 4.3-1 . 20 Heavy Live Loads, Passenger Vehicle

21、 Garages 4.7.3, 4.7.4 . 25 Part III - Snow, Rain and Ice Loads Intersecting Drifts at Low Roofs 7.1, 7.7.3 . 27 Ground Snow Loads for Decks, Balconies, and Other Near-Ground Level Surfaces or Roofs of Subterranean Spaces 7.2 29VI Table of ContentsSignificant Changes to the Minimum Design Load Provis

22、ions of ASCE 7-16 Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of Contents Ground Snow Loads Figure 7.2-1, Tables 7.2-2 through 7.2-8 30 Figure 7.6-1 Figure 7.6-1 . 32 Canopy Drift Figure 7.6-1, 7.7.1 34 Snow Importance Factor for Drift Loading Figure 7.6-1, 7.7.1 36

23、Roof Projections and Parapets 7.8 38 Roof Drainage 8.2 40 Design Rain Loads 8.3, C8.3 . 42 Ponding Instability and Ponding Load 8.4 49 Controlled Drainage 8.5 51 Ice Thickness Maps 10.1.1, 10.4.2, 10.4.6, Figures 10.4-2 through 10.4-6 53 Part IV Earthquake Loads Quality Assurance Provisions Appendix

24、 11A, 11.1.1, 11.1.5, C11.1.5 58 Definition of terms related to of Shear Walls and Diaphragms 11.2 . 60 Steel Storage Racks 11.2, 15.5.3.5, 15.5.3.8, C15.5.3, 23.1 62 Near Fault Sites 11.4.1 64 Site Coefficients F aand F v 11.4.3, 11.4.4 66 Site-Specific Ground Motion Procedures 11.4.8 70VI Table of

25、 Contents Table of Contents VIISignificant Changes to the Minimum Design Load Provisions of ASCE 7-16 Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of Contents Seismic Design Category 11.6 . 73 Geotechnical Investigation Report Requirements for SDC D through F 11.8.3 7

26、5 Vertical Ground Motion Spectrum for Seismic Design 11.9 . 77 Load Combinations with Seismic Load Effects 2.3.1, 2.3.6, 2.4.1, 2.4.5, 12.4.2.3, 12.4.3.2, 12.4.3.3, 12.14.3.1.3, 12.14.3.2.3 80 Foundation Design 12.1.5, 12.13.5, 12.13.6 . 84 Alternative Structural Systems 12.2.1, 12.2.1.1 88 Elements

27、 of Seismic Force-Resisting Systems 12.2.1.2 90 Flexible Diaphragm Condition 12.3.1.3, 11.3 92 Redundancy Factor 12.3.4.1 94 Vertical Seismic Load Effect, E v12.4.2.2 95 Capacity-Limited Horizontal Seismic Load Effect 12.4.3.1, 12.4.3.2, 12.14.3.2.1, 12.14.3.2.2, 11.3 97 Structures with Nonparallel

28、System Irregularities in Seismic Design Category C 12.5.3, 12.5.3.1 . 100 Linear Dynamic Analysis Table 12.6-1, 12.9, 12.9.1, 12.9.2, 12.13.3, 15.1.3 102 Structural Modeling 12.7.3 106 Maximum S DSValue in Determination of C sand E v 12.8.1.3 . 108 Accidental Torsion in Equivalent Lateral Force Proc

29、edure 12.8.4.2 . 110 Number of Modes for Modal Response Spectrum Analysis 12.9.1.1 . 112VIII Table of ContentsSignificant Changes to the Minimum Design Load Provisions of ASCE 7-16 Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of Contents Structural Modeling for Modal

30、Response Spectrum Analysis 12.9.1.8 . 114 Scaling for Modal Response Spectrum Analysis 12.9.1.4, 12.9.1.4.1, 12.9.1.4.2 . 115 Alternative Design Provisions for Diaphragms Including Chords and Collectors 12.10, 12.10.3, 11.2, 11.3 . 117 Diaphragm Design Forces with Transfer Forces 12.10.1.1, 11.2 121

31、 Collector Elements 12.10.2.1 123 Structural Wall Out-of-Place Forces and Anchorage Forces 12.11.1, 12.11.2, 12.11.2.1 124 Transfer of Anchorage Forces into Diaphragm 12.11.2.2.1 . 126 Anchorage of Wood Diaphragms to Concrete or Masonry Structural Walls 12.11.2.2.3, 12.14.7.5.2 . 128 Foundations on

32、Liquefiable Soils 12.13.2, 12.13.9 130 Pile Anchorage Requirements 12.13.8.5 131 Simplified Design Procedure Limitions 12.14.1.1 133 Mechanical and Electrical Components 13.6 137 Exemptions from Chapter 13 Requirements 13.1.4, Table 13.2-1 . 140 Pre-Manufactured Modular Mechanical and Electrical Sys

33、tems 13.1.5 143 Seismic Design Force on Nonstructural Components 13.3.1 144 Dynamic Analysis 13.3.1.4 . 147 Anchors in Masonry 13.4.2.2 . 151 Seismic Coefficients for Nonstructural Components Table 13.5-1, Table 13.6-1 153VIII Table of Contents Table of Contents IXSignificant Changes to the Minimum

34、Design Load Provisions of ASCE 7-16 Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of Contents Exterior Nonstructural Wall Elements and Connections 13.5.3.1 13.5.3.5 155 Exterior Nonstructural Connections 13.5.3.4, Table 13.5-1 158 Glass in Glazed Curtain Walls and Stor

35、efronts 13.5.4 160 Acoustical Tile and Lay-in Panel Ceilings in Seismic Design Categories D though F 13.5.6.2.2 . 162 Egress Stairs and Ramps 13.5.10, Table 13.5-1 164 Seismic Coefficients for Mechanical and Electrical Components Table 13.6-1 . 166 HV ACR Equipment 13.6.2.1 . 168 Distribution System

36、s 13.6.5, 13.6.6, 13.6.7, 13.6.8, 11.2 170 Rooftop Solar Photovoltaic Arrays 13.6.13, 13.4 . 177 Linear Dynamic Analysis 15.1.3 180 Nonbuilding Structures and Vertical Ground Motions 15.1.4, 15.7.2, 15.7.7.3 . 182 Structural Design Requirements 15.4.1 186 Drift Requirements 15.4.5, 15.4.7 188 ASTM F

37、1554 Anchors 15.4.9.4 . 190 Nonbuilding Structure on Liquefiable Sites 15.4.10 . 192 Storage Racks 15.5.3, Table 15.4-1, 11.2 . 193 Structural Towers for Tanks and Vessels 15.5.5.1, 15.7.3, 15.7.10.1 197X Table of ContentsSignificant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table o

38、f ContentsSignificant Changes to the Minimum Design Load Provisions of ASCE 7-16 Amusement structures and telecommunications towers 15.6.3 and 15.6.6 199 Wind Turbine Structures 15.6.7, Table 15.4-2 . 200 Ground-Supported Cantilever Walls or Fences 15.6.8, Table 15.4-2 . 202 Ground-Supported Storage

39、 Tanks for Liquids - Sliding Resistance 15.7.6.1.5 . 204 Ground-Supported Storage Tanks for Liquids 15.7.6.1, 15.7.6.1.2 206 Welded and Bolted Steel for Water Storage and Water Treatment Tanks and Vessels 15.7.7.1, 15.7.7.2 . 209 Flat-Bottom Ground-Supported Tanks and Vessels 15.7.8.1, 15.7.13.1 211

40、 Concrete Pedestal Tanks 15.7.10.7 213 Nonlinear Response History Analysis General Requirements Chapter 16, 11.2, 12.12.1 . 215 Seismic Design Requirements for Seismically Isolated Structures Chapter 17, 11.2 218 Seismic Design Requirements for Structures with Damping Systems Chapter 18 . 222 Soil-S

41、tructure Interaction for Seismic Design 19.1, 19.2, 19.3 and 19.4 225 Site Classification Procedure for Seismic Design 20.3.1 229 Design Response Spectrum 21.3 231 Design Acceleration Parameters 21.4 233 Seismic Ground Motion and Risk Coefficient Maps Chapter 22 Figs. 22-1, 22-2, 22-9, 22-18, 22-19

42、. 235 Seismic Ground Motion, Long-Period Transition and Risk Coefficient Maps Chapter 22 Figs. 22-1 22-8 239X Table of Contents Table of Contents XISignificant Changes to the Minimum Design Load Provisions of ASCE 7-16 Table of ContentsSignificant Changes to the Minimum Design Load Provisions of ASC

43、E 7-16 Part V Wind Loads Enclosure Classification 26.2, 26.12 242 Basic Wind Speed 26.5 245 Ground Elevation Above Sea Level 26.9 253 Edge Zones (a) Widths Figure 28.3-1, Figure 30.3-1, Figure 30.3-2A . 255 Rooftop Equipment 29.4 258 Design Wind Loads: Circular Bins, Silos, and Tanks 29.4.2, 30.12 .

44、 262 Wind Loads on Rooftop Solar Panels 29.4.3, 29.4.4 272 Design Wind Pressures Component Cladding Loads on Roofs with h 60 ft 30.3.2 279 Attached Canopies on Buildings with h 60 ft (18.3 m) 26.2, 30.11 292 Tornado Limitation C26.14 295 Part VI Tsunami Loads and Effects Tsunami Loads and Effects Ch

45、apter 6 301Preface Significant Changes to the Minimum Design Load Provisions of ASCE 7-16 is intended to familiarize structural engineers, architects, code officials, and others in the building construction and design industry to the changes to the design load requirements of the newest edition of M

46、inimum Design Loads and Associated Criteria for Buildings and Other Structures, ASCE/SEI Standard 7-16. This reference book is organized into six parts that generally follow the organization of ASCE 7-16. While not all changes to ASCE 7-16 are shown in this reference, the ones that would be of most

47、interest or those that would have the significant impact on the industry is discussed in detail. Most of the changes addressed include the reason for the change in addition to diagrams, examples, and/or color photographs and illustrations to enrich the readers understanding. This reference is best u

48、sed as a companion to ASCE 7-16 and not a replacement as only a small portion of the complete text of ASCE 7-16 is shown. The commentary and opinions provided are those of the authors and do not necessarily represent the official position of ASCE. Acknowledgement The authors wish to acknowledge the

49、following individuals, including the anonymous reviewers, for their input and review during the development of this publication: Tim Reinhold, Insurance Institute for Building and Home Safety S. K. Ghosh would like to express his heartfelt gratitude to Prabuddha Dasgupta of S. K. Ghosh Associates (SKGA), without whose tremendous help, the seismic portions of this publication could not have been completed in a timely fashion. He would also like to thank Jason Ericksen, formerly of SKGA and currently of ATMI Precast, Aurora, Il, for significant contributi