The influence of structural irregularities of framed tube of tall concrete building on the tube stiffness (in Polish) Wpływ nieregularności konstrukcyjnych powłoki ramowej betonowego budynku wysokiego na jej sztywnośé

Theoretical and numerical research was concentrated on the behaviour of new model of concrete framed-tube structure of tall building made of reinforced concrete and subjected to lateral loads. The methods of linear and nonlinear numerical analyses of the population of concrete framed-tube structures of tall building in a wide range of many variable parameters were also given. The population of tall buildings made of reinforced concrete differ in many various structural, material and loading parameters of framed-tube structures. Based on my own theoretical and numerical analyses the simplified formulas for the values of bending moments in columns and spandrel beams of web frames of framed-tube structure under lateral loads were proposed. A simple calculation method for approximate prediction of cracking influence on the stiffness characteristics of spandrel beams under lateral loads was presented as well as three methods to approximate the determination of the lateral drifts of framed-tube structures with cracked spandrel beams were described.