ATLAS is an analysis/design program which is used for the analysis and design of signal lights and signs supported by the dual cable system. The analysis consists of an iterative technique which is a combination of the Force Density Method (FDM) and the Direct Stiffness Method (DSM). The FDM is ideal for the analysis of cable structures whereas the DSM is the most widely used technique for the analysis of framed structures. The nature of the structures under consideration lead to the development of this analysis technique which is a combination of the two methods. ATLAS handles the wind loading in a realistic manner. It allows the user to specify the wind speed as well as the areas of the signal lights or signs, parallel to the X and Y axis. In doing so the program calculates the applied loads on the corresponding nodal points internally, based on the specified element areas of the LIGHT elements in each plane. The loads are calculated in each cycle of the nonlinear process. Therefore, the applied loads in each cycle change with the rotation angle of the light. Thus the load are more realistic since they change with the swinging of the light. The angle change of the light also causes an uplift load at the cable nodal points.
Version 6 is now available. This version offers an easier to use, true Windows interface for creating models. Poles, cables and lights can be chosen using standard Windows dialog boxes. Controls and options are available using standard Windows menus and buttons.
Version 6 is in compliance with the 2006 AASHTO standard specifications for structural supports for highway signs and traffic signals AND to the FDOT Design Standard Index 17725.
It is noted that v6 is not compatible with v5.04 since analysis and design options of v6 have been updated according to the aforementioned specification and index.
Version 6.01 Overview
For more information about Atlas,