Interactive techniques with graphical output for bridge analyses

Abstract This paper considers the implementation of algorithms, in the form of a programming system, for the finite element modeling and analysis of bridges. Also described are the linkages between the modeling and analysis phases as controlled by the user. The nature and type of commands necessary are subsequently presented and discussed. Finally, an example of a single cell box girder bridge with graphical results for the modeling and analysis phases is presented. The modeling system, which communicates with the user through a problem oriented language, allows the user to: define the parameters that characterize the structure; modify an already discretized structure; and obtain graphical or line printer displays of various structural components such as structure geometry, cross section geometry, and various results of analysis such as deflections, reactions and stress resultants. The modeling system automatically performs the following: discretization of the structure; generation of elements and assignment of attributes; and node numbering and location.