TABLE OF CONTENTS. 



CHAPTER III. STEEL HIGHWAY BRIDGES. 



Types of Truss Bridges 107 



Types of Structure . no 



Loads in 



Weights of Bridges in 



Weights of Standard Bridges 112 



Live Loads I I2c 



Impact I I2c 



Concentrated Live Loads H2d 



Distribution of Concentrated 



Loads i I2e 



Uniform Live Loads I I2f 



Wind Loads Ii2h 



Highway Bridge Floors H2h 



Reinforced Concrete Floors. Ii2h 



Buckle Plates 1 12] 



Plank Floors. . . H2k 



Highway Bridge Floors. 



Wearing Surface for Floors Ii2m 



Stringers 1 120 



Floor Beams I I2p 



Calculation of Stresses 115 



Allowable Stresses 115 



Short Span Steel Bridges 115 



Beam Bridges 1 16 



Plate Bridges 122 



Low Riveted Truss Bridges 122 



High Truss Steel Bridges 128 



Shoes and Pedestals 135 



Fence and Hub Guards 136 



General Specifications for Steel Highway 



Bridges 137 



References 147 



CHAPTER IV. STEEL RAILWAY BRIDGES. 



Types of Steel Bridges 149 



Weights of Railway Bridges 151 



Loads 152 



Cooper's Conventional System of Wheel 



Concentration 153 



Equivalent Uniform Loads 159 



Uniform Loads and One or Two Excess 



Loads '. 160 



Maximum Stresses 160 



Criteria for Maximum Stresses 1 60 



Kinds of Stress 161 



Impact Stresses 161 



Impact Formulas 161 



Launhardt-Weyrauch Formulas 162 



Cooper's Method 162 



Impact Tests 162 



Calculation of Stresses 164 



Moments, End Shears and Floorbeam 



Reactions 164 



Moment Diagram 164 



Shears in Bridges 164 



Moments in Bridges 164 



Shears and Moments in a Plate Girder 173 



Material 173 



Allowable Stresses 173 



Economic Design of Railway Bridges. ... 174 



Details of Railway Bridges 175 



Sections for Chords and Posts 175 



Floors 176 



Waterproofing Bridge Floors 178 



Floorbeam Connections 184 



Pedestals and Shoes 184 



Examples of Plate Girders 184 



Examples of Truss Bridges 185 



Specifications for Railway Bridges 1 88 



Clearances 201 



Types of Bridges 202 



Spacing of Trusses 202 



Ties T 202 



Live Loads 203 



Impact 205 



Wind Loads 205 



Centrifugal Force 205 



Unit Stresses 206 



Alternate Stresses 206 



Net Sections 206 



Plate Girders 206 



Compression Flanges 206 



Counters 206 



Minimum Angles 206 



Expansion 206 



Rollers 206 



Stringer Connection Angles 206 



Camber of Plate Girders 206 



Web Stiffeners 207 



Camber of Trusses 207 



Rigid Members 207 



Eye-Bars 207 



Miscellaneous Specifications 207 



General Specifications for Steel Railway 



Bridges 208 



Instructions for the Design of Railway 



Bridges 219 



References 224 



