MDX Version 6

1 MDX Version Curved & Straight Steel Bridge Design & Rating (also covers the Line Girder Design & Rating package) Tel: (573) 446-3221 Fax: (573) 446-3278 July 3, 2009 ii Table of Contents General Information .. 1 Installation .. 1 Starting the Program .. 2 List of Features .. 2 Technical Support & 3 Menu System .. 5 File Menu .. 5 Mode Menu .. 5 Define Menu .. 6 Generate Menu .. 6 Settings Menu .. 6 Help Menu .. 7 Project Information Menu .. 7 Project Procedures .. 9 Project Type .. 9 Layout Type in Girder System Projects .. 9 Girder System Design Project 9 Girder System Rating Project Procedures .. 10 Line Girder Design Project Procedures .. 10 Line Girder Rating Project Procedures .. 11 Reviewing Input .. 11 Reviewing Output .. 11 Frequently Asked Questions .. 11 Input Categories .. 13 Parallel/Concentric Girder System Layout Definition.

2 13 Overview of Parallel/Concentric Girder System Layout Definition .. 13 Girder Layout .. 16 Span Lengths of Girder 1 in Parallel/Concentric Girder System Projects .. 16 Support Skew at Girder 1 in Parallel/Concentric Girder System Projects .. 17 Horizontal Curvature of Girder 1 in Parallel/Concentric Girder System Projects .. 17 Type of Girders in Parallel/Concentric Girder System Projects .. 17 Girder Spacing in Parallel/Concentric Girder System Projects .. 17 Girders Acting as Stringers in Girder System Projects .. 18 Bracing Layout .. 18 Intermediate Bracing Locations in Parallel/Concentric Girder System Projects .. 18 Intermediate Bracing Skew Angles in Parallel/Concentric Girder System Projects .. 18 Bracing Along Piers in Parallel/Concentric Girder System Projects .. 18 Customize Generated Geometry .. 19 Adding Nodes to Girders in Parallel/Concentric Girder System Projects.

3 19 Adding Bracing in Parallel/Concentric Girder System Projects .. 19 Removing Bracing in Parallel/Concentric Girder System Projects .. 19 Adding Supports in Parallel/Concentric Girder System Projects .. 19 Removing Supports in Parallel/Concentric Girder System Projects .. 20 Supports/Hinges .. 20 Integral Supports in Parallel/Concentric Girder System Projects .. 20 Support Translation Releases in Parallel/Concentric Girder System Projects .. 20 Springs at Supports in Parallel/Concentric Girder System Projects .. 21 iii Hinges in Girder System Projects .. 21 General Girder System Layout Definition .. 22 Overview of General Girder System Layout Definition .. 22 Girder Layout .. 24 Girder Coordinates in General Girder System Projects .. 24 Horizontal Curvature in General Girder System Projects .. 25 Girders Acting as Stringers in Girder System Projects.

4 25 Partial Fascia Girders in General Girder System Projects .. 25 Bracing Layout .. 25 Bracing Incidences in General Girder System Projects .. 25 Supports/Hinges .. 26 Support Nodes in General Girder System Projects .. 26 Support Types in General Girder System Projects .. 26 Pseudo Supports in General Girder System Projects .. 26 Hinges in Girder System Projects .. 26 Line Girder Layout Definition .. 27 Overview of Line Girder Layout Definition .. 27 Span Lengths in Line Girder Projects .. 27 Intermediate Bracing Locations in Line Girder Projects .. 28 Bracing at Supports in Line Girder Projects .. 28 Hinges in Line Girder Projects .. 28 Abutment Type in Line Girder Projects .. 28 Slab Definition .. 29 Overview of Slab Definition in Line Girder Projects .. 29 Overview of Slab Definition in Girder System Projects .. 30 Concrete Properties.

5 30 Slab Overhang Width in Girder System Projects .. 31 Slab Thickness in Line Girder Projects .. 31 Slab Thickness in Girder System Projects .. 31 Effective Slab Width in Line Girder Projects .. 31 Effective Slab Width in Girder System Projects .. 32 Slab Haunch .. 32 Slab Steel Reinforcement .. 32 Loading Definition .. 33 Overview of Loading Definition in Line Girder Projects .. 33 Overview of Loading Definition in Girder System Projects .. 34 Dead Load .. 35 Noncomposite Dead Load in Line Girder Projects .. 35 Noncomposite Dead Load in Girder System Projects .. 36 Composite Dead Load in Line Girder Projects .. 36 Composite Dead Load in Girder System Projects .. 36 Live Load .. 37 Truck Loading in Line Girder Projects .. 37 Truck Loading in Girder System Projects .. 37 Lane Layout/Lateral Distribution in Parallel/Concentric Girder System Projects.

6 37 Lane Layout/Lateral Distribution in General Girder System Projects .. 38 Lateral Distribution of Live Load in Line Girder Projects .. 38 Sidewalk Loading in Line Girder Projects .. 38 Sidewalk Loading in Girder System Projects .. 39 iv Girder Definition .. 40 Overview of Girder Definition in Line Girder Projects .. 40 Overview of Girder Definition in Girder System Projects .. 44 Cross 48 Web Splices .. 48 Web Depth .. 48 Web Thickness .. 48 Rolled Shape Sections .. 49 Cover Plates .. 49 Flange Splice Locations .. 49 Top Flange Width .. 49 Top Flange Thickness .. 50 Bottom Flange 50 Bottom Flange Thickness .. 50 Stiffeners .. 50 Bearing 50 Intermediate Transverse Stiffeners .. 51 Longitudinal Web Stiffeners .. 51 Bottom Flange 51 Internal Diaphragms at Supports .. 51 Connections .. 52 Shear Connectors .. 52 Allowable Weld Stress.

7 52 Steel .. 52 Girder Steel .. 52 Girder Stiffener 53 Bracing Definition .. 54 Overview of Bracing Definition in Girder System Projects .. 54 Bracing Steel .. 54 Bracing Group Characteristics .. 55 Assignment of Bracing to Groups .. 55 Design Generation Settings .. 56 Overview of Design Generation Settings in Line Girder Projects .. 56 Overview of Design Generation Settings in Girder System Projects .. 57 Girder Design Settings .. 58 Web Splice Settings .. 58 Web Depth Settings .. 59 Web Thickness 59 Rolled Shape Settings .. 59 Girder Steel Settings .. 60 Top Flange Width Settings .. 60 Top Flange Thickness Settings .. 60 Bottom Flange Width Settings .. 60 Bottom Flange Thickness Settings .. 61 Stiffener Settings .. 61 Bracing Design Settings .. 61 Bracing Steel Settings .. 61 Bracing Group Characteristics Settings .. 62 Bracing Group Assignment Settings.

8 62 v Specification Settings .. 63 Overview of Specification Settings .. 63 Exceptions to AASHTO Specifications .. 64 Welding Specification .. 64 Live Load Deflection Limit .. 64 LRFD Load Modifiers .. 64 Analysis Settings .. 65 Overview of Analysis Settings in Line Girder Projects .. 65 Overview of Analysis Settings in Girder System Projects .. 66 Modeling Settings in Line Girder Projects .. 67 Modeling Settings in Girder System Projects .. 67 Section Properties Options .. 67 Live Load + Impact Options .. 68 Slab Pouring Settings .. 68 Stress Check Settings .. 68 Fatigue Settings .. 69 Overview of Fatigue Settings .. 69 Fatigue Stress Cycles .. 69 Fatigue Stress Options .. 70 Fatigue Category Options .. 70 Output Settings .. 71 Overview of Output Settings in Line Girder Projects .. 71 Overview of Output Settings in Girder System Projects.

9 72 Output Units .. 73 Output Table Options .. 73 Analysis Verification Output in Line Girder Projects .. 73 Analysis Verification Output in Girder System Projects .. 74 Data Structure .. 75 Project Directory .. 75 Project File .. 75 Input Files .. 75 Output Files .. 76 Computational Methods .. 77 Girder System Analysis .. 77 Line Girder Analysis .. 78 Girder Design Generator .. 79 Bracing Design Generator .. 80 Lateral Bending Stress .. 80 Bolted Web Splice Design and Analysis .. 80 Box Girder Torsional Stress .. 80 Performance Ratios .. 81 Program Messages .. 83 Girder Design Generation Termination Messages .. 83 Input Reference by Category .. 87 Layout Definition Input Reference .. 87 Slab Definition Input Reference .. 90 Loading Definition Input Reference .. 91 Girder Definition Input Reference .. 97 Bracing Definition Input Reference.

10 104 vi Design Generation Settings Input Reference .. 106 Specification Settings Input Reference .. 108 Analysis Settings Input Reference .. 111 Fatigue Settings Input Reference .. 115 Output Settings Input Reference .. 117 Input Glossary .. 119 Data Items .. 119 ABUTW .. 119 ADDBNODE .. 119 ADDMEM .. 120 ADDSUP .. 120 ADN-i .. 121 ADTT .. 121 ADTRUSS .. 121 AHTRUSS .. 122 ASTRUSS .. 122 AXLEP .. 122 AXLESP .. 123 BARCEN .. 123 BAREA .. 123 BARIO .. 123 BBDL .. 124 BCOVB .. 124 BCOVSP .. 124 BCOVT .. 124 BCPMXP .. 125 BCPPCT .. 125 BETA .. 125 BFISPB .. 125 BFISPT .. 126 BFNHOLES .. 126 BFOSPB .. 127 BFOSPT .. 127 BLONGSP .. 127 BNCLIP .. 128 BNGSKEW .. 128 BR .. 128 BR-i .. 129 BRBF .. 129 BRINCD .. 130 BRL-i .. 130 BSK-i .. 131 BSPACE .. 131 BSPL .. 132 CHGCURVE .. 132 COMSPC .. 133 CURB .. 133 D1 CON .. 134 D2 CON .. 134 vii DCGAMMA.