ConnectionDesignGuide7 SIMPLECONNECTIONS
Design Guide 7:
Pinnedbaseplateconnectionsfor columns
FirstEdition2011Author T.J.Hogan
pdcconsultants
DesignGuide7
Pinnedbaseplateconnectionsforcolumns
by
T.J.Hogan
firstedition-2011
Design Guide 7Pinned base plate connections for columns
Copyright ○ 2011 by AUSTRALIAN STEEL INSTITUTE
Published by: AUSTRALIAN STEEL INSTITUTE
jo wo Aue u penpouden eq sou sn yoee ued ue io yoog su pase suu ithe written permission of Australian Steel Institute.
Note to mercial software developers: Copyright of the information contained within this publication isheld by Australian Steel Institute (ASl).Written permission must be obtained from ASIfor the use of any
FIRST EDITION 2011 (LIMIT STATES)
National Library of Australia Cataloguing-in-Publication entry:Hogan T.J.
Design Guide 7: Pinned base plate connections
1° ed.
Includes bibliographic references. ISBN 978 1 4 2 (pbk.).Steel Structural--Standards - Australia. Steel Structural-Specifications - Australia.Australian Steel Institute. Joints (Engineering)-Design and construction.(Series: Structural steel connections series).
This publication originated as part ofDesign of structural connectionsSecond edition 1981 First edition 1978Fourth edition 1994 Third edition 1988
Also in this series:
Design capacity tables for structural steel. Volume 3: Simple connections-Open sectionsHandbook 1: Design of structural steel connectionsDesign Guide 1: Bolting in structural steel connections Design Guide 2: Welding in structural steel connectionsDesign Guide 4: Flexible end plate connections Design Guide 3: Web side plate connectionsDesign Guide 5: Angle cleat connections Design Guide 6: Seated connectionsDesign Guide 10: Bolted moment end plate beam splice connections Design Guide 11: Welded beam to column moment connectionsDesign Guide 12: Bolted end plate beam to column moment connections Design Guide 13: Splice connectionsDesign capacity tables for structural steel. Volume 4: Rigid connections-Open sections
professional advice. While every effort has been made and all reasonable care taken to ensure theaccuracy of the information contained in this publication this information should not be used or relied upon for any specific application without investigation and verification as to its accuracy. suitability andapplicability bya petentprofessional personin thisregard.TheAustralianSteellnstituteitsofficers and employees and the authors and editors of this publication do not give any warranties or make anynotbeheldliable orresponsible inanyway;and （b)expressly disclamanyliability orresponsibility forthat persnisthpurhaserf thispuliationrotWihoutimitationthsincldelossamagecossand expenses incurred as a result of the negligence of the authors editors or publishers.
The information in this publication’should not be relied upon as a substitute for independent dueor persons should be sought.
CONTENTS
Page
List of figures ivList of tablesPreface About the author vi viAcknowledgements vi1CONCEPT OFDESIGN GUIDES. Background 11.1 12DESCRIPTION OF CONNECTION.....23TYPICAL DETAILING OF CONNECTION.. 44 DETAILING CONSIDERATIONS...... 4.1 Base plate dimensions for open 6sections 64.2 4.3 Base plate detailing Anchor bolt detailing 11 85CODE REQUIREMENTS 146 BASIS OF DESIGN MODEL 156.1 Axial pression 156.2 6.3 Horizontal shear Anchor bolts in shear 17 196.4 6.5 Anchor bolts in tension Axial tension 21 246.6 Anchor bolts subject to tensionand shear simultaneously 267CALCULATION OFDESIGN ACTIONS...278RECOMMENDED DESIGN MODEL- SUMMARYOF DESIGN CHECKS.... 289RECOMMENDED DESIGN MODEL- AXIAL COMPRESSON AND SHEAR. 299.1 DESIGN CHECK NO. 1-Design capacity for bearing on concreteuoddns 299.2 DESIGN CHECK NO.2-Design capacity of steel base plate 329.3 DESIGN CHECK NO.3-Design capacity of weld at column base 34
Page9.4 DESIGN CHECK NO. 4-Designcapacity for horizontal sheartransfer by friction at base plate/concrete interface 359.5 DESIGN CHECKNO.5-Design capacity for horizontal sheartransfer by bearing of embedded9.6 DESIGNCHECK NO.6-Design steel column 36capacity for horizontal shear transfer through shear key 389.7 DESIGN CHECKNO.7-Designcapacity for horizontal shear transfer through anchor bolts 4010 RECOMMENDED DESIGN MODEL-10.1 DESIGN CHECK NO.8-Design AXIAL TENSION AND SHEAR. ...3capacity of steel base plate 4310.2 DESIGN CHECK NO.9Design capacity of weld at column base 5110.3 DESIGN CHECK NO.10-Design10.4 DESIGN CHECK NO.5 capacity of anchor bolts in tension 5610.5 DESIGN CHECK NO. 6 10.6 DESIGN CHECK NO.7 56 5610.7 DESIGN CHECK NO.11-Designtension applied to anchor bolts capacity for horizontal shear and 5711 DESIGN EXAMPLES11.1Axial pression and shear Design Example No. 1 5811.2 Axial pression or axial tensionand shear-Design Example No. 2 6212REFERENCES. .67APPENDICES Limcon software 69A B ASI Design Guide 13ment form 76
LIST OF FIGURES
Page
PageFigure 22 Effective tensile areas to free edges. .37Figure 23 Shear key detail. .39Figure 24 Dimensions of shear key.Figure 25 Shear key to resist shear force in two directions .39Figure 26 Break-out cone assumptions .41Figure 27Reinforcement to failure cone of anchor bolt subject toFigure 28Yield line layout near the shear force ....... ..42bolt hole... .46Figure 29 Geometry for RHS/SHS base plate bolts on two sides only.. .47Figure 30 Geometry forRHS/SHS baseFigure 31 Geometry forRHS/SHS base plate bolts on four sides .... .48plate bolts in four corners only... ..9Figure 32 Geometry for circular CHS base plate ... .50Figure 33 Concrete breakout cone forFigure 34 Concrete breakout cone for single anchor bolt ..53anchor bolt groupFigure 35 Concrete breakout cone for anchor bolt near edge .54Figure 36 Lateral bursting force foranchor bolts subject to tension and near an edge ..55Figure 37 Steel reinforcement to anchor bolts subject to tension ..55Figure 38 Design example 1 axialFigure 39 Concrete pier tie reinforcement...61 pression and shear.. .58Figure 40 Design example 2 axialpression or axial tension and shear . .62Figure 41 Concrete breakout cone forFigure 42 Concrete breakout cones for single anchor bolt . ...66anchor bolt group. ...66
Figure 1 Typical pinned column base plates..... 2Figure 2 Typical detailing of pinned columnbase plates for open sections... 4Figure 3 Typical detailing of pinned column base plates forhollow sections....5Figure 4 Use of steel shims. 9Figure 5 Figure 6 Tolerances permitted by Shear key details. 6Varieties of cast-in anchor bolt... 12 AS 4100 in anchor bolt location... 10Figure 7 Figure 8 Caged anchor bolt arrangement... 13Figure 9 Cored hole detail aroundFigure 10 Assumed loaded area for base anchor bol...... 13plate subject to axial pression-cantilever method..16Figure 11 Assumed loaded area for Murray-Figure 12 Stress distribution on shear key... 18 Stockwell Method ... 16Figure 13 Effective width of base plateresisting bending. 21Figure 14 Murray yield line approach. Figure 15 Failure plane for anchor bolt pull- 22out used in references 2 and 8.... 24Figure 16 Anchor bolt failure surfaces- bolt subject to tension .. 25Figure 17 Design actions on column bases.. 27Figure 18 Base plate dimensions and assumed loaded area of basesections.Cantilever method.... 29 plate (shown shaded) for openFigure 19 Base plate dimensions andassumed loaded area of base plate (shown shaded) for closedsections-Cantilever method.Figure 20 Murray-Stockwell model assumed shape of pressureFigure 21 Column embedment detail distribution 36 31
