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A bridge is more than the sum of stresses and strains: it is an expression of man creative urge challenge and an opportunity to create the beautiful. A bridge is the fulfillment of human dreams and hopes and aspirations. A bridge is a monument to mankind indomitable will to achieve. Bridges symbolize the ideals and aspirations of humanity.




This book is intended to serve as a source of the state-of-the-art knowledge pertaining to design and analysis of highway bridge superstructures conforming to AASHTO-LRFD Specifications for Design of Highway Bridges.




The discussion presented herein focuses on the load and resistance design philosophy conforming to AASHTO LRFD Bridge Design Specifications. A fairly detailed account of the historical development and design of highway bridges conforming to AASHTO Standard Specifications for Highway Bridges, now archived, can be found in the author 1998 book, Design of Modern Highway Bridges (McGraw-Hill, 1998); that topic is not discussed herein.




This book has been designed to serve both as a stand-alone text for a first course in design of highway bridge superstructures and a handy reference for educators and practicing engineers. This is essentially a how to do book and has code-connected design focus.




A fair amount of undergraduate-level knowledge of structural loads and analyses and exposure to first courses in design of steel and concrete structures are essential for a quick grasp of the material presented herein.
Because of the simplicity in style and format, this book can be used as a tool for teaching highway bridge design courses for both undergraduate- and graduate-level classes.




An important reason for the simple formatting of the book is to fill the need of the times. In many civil engineering curricula, highway bridge design course is offered to a class that comprises both graduate- and senior-level students (the author has taught such classes); the latter quite often possess neither the same level of prerequisite knowledge nor the depth of engineering maturity as the former.




As such, the format and style of this book, along with many fully solved examples, have been designed to fill that need. Both students as well as design engineers will find this book as an excellent learning resource and a practical guide for engineering practice. Presented in this book is




a detailed discussion, with design examples, of concrete (both reinforced and prestressed) and steel bridge superstructures commonly used for bridges in the short span range. Wood superstructures are not covered in this book as they are built rather infrequently and have limited practical applications. This book is divided into six chapters as follows.

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