PL
The paper refers to a method of statical calculation and to the forms of structural systems developed as results of an appropriate application of the principle of superposition. The point of the two-stage method of calculation of the statically indeterminate trusses is to do a suitable reduction of scheme of a given truss in order to obtain the scheme of a statically determinate truss together with a double application of simple methods used for these purposes and then application of superposition of obtained values of forces in appropriate members of the truss. Discussed also, are the procedures of shaping of selected forms of structural systems where the principle of superposition has been applied. It will be shown on suitable examples of the forms of a lenticular girder and of a system of combined foundation and a high-rise building.