The main goal of the present paper is to introduce an algorithmic method that can be used in order to automatically optimize large spanning truss structures, such as stadium roofs and other large steel frameworks. Implementing such a method allows design to be freed from its dependence on the engineer's work accuracy, not to mention the time saved. Therefore, it has proven to be very useful when it comes to comparing the influence of many parameters within a short lapse of time, allowing several people to work on the same project and compare results.