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SAP2000/Bridge

Bridge Seismic Design
Automated Seismic Design of Bridges AASHTO Guide Specification for LRFD Seismic Bridge Design

ISO SAP041709M22 Rev. 0
Berkeley, California, USA

Version 14
April 2009

COPYRIGHT
Copyright  Computers & Structures, Inc., 1978-2009 All rights reserved. The CSI Logo® is a registered trademark of Computers & Structures, Inc. SAP2000 TM and Watch &Learn are trademarks of Computers & Structures, Inc. Adobe and Acrobat are registered trademarks of Adobe Systems Incorported. AutoCAD is a registered trademark of Autodesk, Inc. The computer program SAP2000 and all copyrighted products. Worldwide rights of Inc. Unlicensed use of these programs or without prior written authorization from prohibited.
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associated documentation areproprietary and ownership rest with Computers & Structures, reproduction of documentation in any form, Computers & Structures, Inc., is explicitly

No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior explicit written permission of the publisher. Further information and copies of this documentation may beobtained from: Computers & Structures, Inc. 1995 University Avenue Berkeley, California 94704 USA Phone: (510) 649-2200 FAX: (510) 649-2299 e-mail: info@csiberkeley.com (for general questions) e-mail: support@csiberkeley.com (for technical support questions) web: www.csiberkeley.com

DISCLAIMER

CONSIDERABLE TIME, EFFORT AND EXPENSE HAVE GONE INTO THE DEVELOPMENT AND TESTING OF THIS SOFTWARE.HOWEVER, THE USER ACCEPTS AND UNDERSTANDS THAT NO WARRANTY IS EXPRESSED OR IMPLIED BY THE DEVELOPERS OR THE DISTRIBUTORS ON THE ACCURACY OR THE RELIABILITY OF THIS PRODUCT. THIS PRODUCT IS A PRACTICAL AND POWERFUL TOOL FOR STRUCTURAL DESIGN. HOWEVER, THE USER MUST EXPLICITLY UNDERSTAND THE BASIC ASSUMPTIONS OF THE SOFTWARE MODELING, ANALYSIS, AND DESIGN ALGORITHMS AND COMPENSATE FOR THE ASPECTSTHAT ARE NOT ADDRESSED. THE INFORMATION PRODUCED BY THE SOFTWARE MUST BE CHECKED BY A QUALIFIED AND EXPERIENCED ENGINEER. THE ENGINEER MUST INDEPENDENTLY VERIFY THE RESULTS AND TAKE PROFESSIONAL RESPONSIBILITY FOR THE INFORMATION THAT IS USED.

Contents

Bridge Seismic Design
Foreword Step 1 Create the Bridge Model
1.1 1.2 1.3 1.4 Sample Model Description of the Sample Bridge Model BridgeLayout Line Frame Section Property Definitions 1.4.1 Bent Cap Beam 1.4.2 Bent Column Properties 1.4.3 I-Girders Properties 1.4.4 Pile Properties Bridge Deck Section Bent Data Bridge Object Definition 1.7.1 Abutment Property Assignments 1.7.2 Abutment Geometry 1-1 1-2 1-4 1-4 1-5 1-5 1-6 1-7 1-8 1-8 1-10 1-11 1-13

1.5 1.6 1.7

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SAP2000/Bridge Seismic Design

1.7.3 1.7.4 1.8 1.9

BentProperty Assignments Bent Geometry

1-14 1-15 1-16 1-16 1-17

Equivalent Pile Formulation Bent Foundation Modeling

1.10 Mass Source

Step 2

Ground Motion Hazard
2.1 2.2 2.3 2.4 2.5 2.6 Overview AASHTO and USGS Hazard Maps Seismic Design Request Perform Seismic Design Auto Load Patterns Auto Load Cases 2-1 2-1 2-3 2-6 2-7 2-7

Step 3

Dead Load Analysis and Cracked Section Properties3.1 Overview 3-1

Step 4

Response Spectrum and Demand Displacements
4.1 4.2 4.3 Overview Response Spectrum Load Cases Response Spectrum Results 4-1 4-1 4-4

Step 5

Determine Plastic Hinge Properties and Assignments
5.1 5.2 5.3 5.4 Overview Plastic Hinge Lengths Nonlinear Hinge Properties Nonlinear Material Property Definitions 5.4.1 Nonlinear Material Properties Definitions ForConcrete 5.4.2 Nonlinear Material Properties Definitions For Steel 5-1 5-1 5-3 5-6 5-6 5-8

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5.5

Plastic Hinge Options

5-9

Step 6

Capacity Displacement Analyses
6.1 6.2 6.3 Displacement Capacities for SDC B and C Displacement Capacities for SDC D Pushover Results 6-2 6-3 6-6

Step 7

Demand/Capacity Ratios
7.1 D/C Ratios 7-1

Step 8

Review Output and Create...