Janusz Rębielak

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.

This paper contains several author’s propositions for the shaping of structural systems for the design of high-rise buildings. The author has developed these structural systems as special types of space structures. The main goal in the processes of shaping these structures was to strive to enhance their rigidity by relatively simple means. Additionally, there was the aim to incorporate alternative evacuation routes in cases of emergency rather than only by vertical transportation means, which are usually located only in the central cores of tall buildings. The proposed structural systems of aboveground floors need to be highly resistant to the maximum values of horizontal, vertical, thermal and earthquake loads. These structures for high-rise buildings can be constructed from steel, reinforced concrete or they can be compound systems. Applications of these systems will considerably enrich the scope of the architectonic views of the tall buildings in which they are incorporated. The safety of tall buildings is to a large extent determined by the stability of their foundation structure particularly when they are located in areas with subsoil of small load capacity or areas that are at risk of earthquake. The paper also presents some proposals for the shaping of the foundation systems devised by the author and indented for heavily loaded objects including high-rise buildings.