This paper presents a computer-aided environment aimed at assisting designers during the very first stages of the structural design process. It gives designers the opportunity to build and modify interactively geometric constraints that control the structural shape and its static equilibrium simultaneously and in an entirely graphical way. Following a brief contextualization, the paper presents the main features of the inner algorithms. Typical uses are then described in order to illustrate the wide range of applications and their practical benefits. As a result, it is argued that this environment opens up new opportunities for precognitive, chronology-free and highly interactive paradigms of structural equilibrium design.