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1、 GUIDE SPECIFICATIONS FOR SEISMIC DESIGN OF STEEL BRIDGES First Edition State of California Department of Transportation December 2001 GUIDE SPECIFICATIONS FOR SEISMIC DESIGN OF STEEL BRIDGES FIRST EDITION December 2001 ii TABLE OF CONTENTS PREFACE i DEFINITIONS iv NOTATION vii 1 INTRODUCTION 1 1 1
2、Scope 1 1 2 Referenced Specifications and Standards 1 1 3 Bridge Categories 2 1 4 Seismic Performance Criteria 2 2 GENERAL PROVISIONS 3 2 1 Loads and Load Combination 3 2 2 Seismic Design Acceptance Criteria 3 2 2 1 Structural Component Classification 3 2 2 2 Damage Levels Strain and Ductility in St
3、ructural Steel 6 2 2 3 Displacements 8 2 2 4 Forces 8 3 STRUCTURAL ANALYSIS 9 3 1 Analysis Methods 9 3 1 1 General 9 3 1 2 Moment Curvature Analysis 11 3 2 Structural Modeling 12 3 2 1 General 12 3 2 2 Materials 13 3 2 3 Geometry 13 3 2 4 Effective Section Properties 15 4 DESIGN REQUIREMENTS 16 4 1
4、Proportions 16 4 2 Materials 17 4 3 Effective Net Sections 18 4 4 Effective Length of Compression Members 18 4 5 Limiting Width Thickness Ratios 19 4 6 Limiting Slenderness Parameters 19 4 7 Built up Members 23 4 8 Shear Connectors 24 4 9 Restraining Components 26 4 10 Welding 28 GUIDE SPECIFICATION
5、S FOR SEISMIC DESIGN OF STEEL BRIDGES FIRST EDITION December 2001 iii 5 DUCTILE SEISMIC RESISTING SYSTEMS 29 5 1 Ductile Substructure Systems 29 5 1 1 Moment Resisting Frames 29 5 1 2 Concentrically Braced Frames 32 5 1 3 Eccentrically Braced Frames 34 5 2 Ductile End Cross Frames and Diaphragms 37
6、5 2 1 General 37 5 2 2 Effective Column Area 38 5 2 3 Boundary Conditions of Effective Columns 38 5 3 Integral Connection Systems 39 5 3 1 General 39 5 3 2 Steel Girder Superstructures 39 5 3 3 Concrete Columns 40 5 3 4 Concrete Bent Cap Beams 40 5 3 5 Concrete End Diaphragms at Abutments 41 6 DUCTI
7、LE COMPONENTS 42 6 1 General 42 6 2 Tension Members 42 6 3 Compression Members 42 6 4 Flexural Members 43 6 5 Members Subjected to Combined Flexure and Axial Force 43 7 CAPACITY PROTECTED COMPONENTS 44 7 1 General 44 7 2 Tension Members 44 7 3 Compression Members 44 7 4 Flexural Members 45 7 5 Membe
8、rs Subjected to Combined Flexure and Axial Force 45 7 6 Connections and Splices 45 7 6 1 General 45 7 6 2 Bracing Connections 46 7 6 3 Beam to Column Connections 47 7 6 4 Gusset Plate Connections 48 7 7 Fasteners and Holes 54 7 8 Anchor Rods and Anchorage Assemblies 54 APPENDICES A STRESS STRAIN REL
9、ATIONSHIPS FOR STRUCTURAL STEEL 56 B EFFECTIVE SECTION PROPERTIES 58 C YIELD SURFACE EQUATIONS FOR DOUBLY SYMMETRICAL STEEL SECTIONS 63 D DESIGN FORMULAS U S UNITS 65 E LATERAL STIFFNESS OF GIRDER BRIDGES IN TRANSVERSE DIRECTION 67 F REFERENCES 71 GUIDE SPECIFICATIONS FOR SEISMIC DESIGN OF STEEL BRI
10、DGES FIRST EDITION December 2001 iv DEFINITIONS The following definitions are supplemental to the definitions given in the Caltrans Seismic Design Criteria Version 1 2 Caltrans 2001 and the Caltrans Bridge Design Specifications Caltrans 2000 Block Shear Rupture A failure phenomenon or limit state fo
11、r a bolted web connection of coped beams or any tension connection by the tearing out of a portion of a plate along the centerlines of the bolt holes The block shear rupture strength combines tensile strength on one plane and shear strength on a perpendicular plane Bracing Member A member intended t
12、o brace a main member or part thereof against lateral movement Capacity Protected Component A component expected to experience minimum damage and to behave essentially elastic during the design earthquakes Connections A combination of joints used to transmit forces between two or more members Concen
13、trically Braced Frame CBF A diagonally braced frame in which all members of the bracing system are subjected primarily to axial forces Design Earthquake Earthquake loads represented by Acceleration Response Spectrum ARS curves specified in Caltrans SDC or site specific ARS curves Design Strength Res
14、istance axial shear force moment as appropriate provided by structural components the product of the nominal strength and the resistance factor Displacement Ductility Ratio of ultimate to yield displacement Ductile Component A component expected to experience repairable damage during the FEE and sig
15、nificant damage but without failure during the SEE Ductility Ratio of ultimate to yield deformation Eccentrically Braced Frame EBF A diagonally braced frame that has at least one end of each bracing member connected to a link Expected Nominal Strength Nominal strength of a component based on its exp
16、ected yield strength Functional Evaluation Earthquake FEE A lower level design earthquake that has relatively small magnitude but may occur several times during the life of the bridge It may be assessed either deterministically or probabilistically The determination of this event is to be reviewed by a Caltrans approved consensus group 标准分享网 w w w b z f x w c o m 免费下载 GUIDE SPECIFICATIONS FOR SEISMIC DESIGN OF STEEL BRIDGES FIRST EDITION December 2001 v Joint An area where member ends surfaces o
