Torsion of asymmetric buildings during non-linear deformation of reinforced concrete

Abstract

Torsion occurs in asymmetrical buildings under the action of seismic and wind loads. The main cause of torsion is the eccentricity between the center of stiffness and the center of mass. This paper considers the resistance of multi-storey load-bearing systems of buildings during torsion caused by an asymmetric arrangement of vertical load-bearing elements. An increase in the eccentricity between the center of mass and the center of stiffnesses leads to an increase in the torsional effects on the load-bearing systems and load-bearing elements. The torsional angles of buildings increase. The shapes of vibrations change. Linear-elastic model of resistance of reinforced concrete structures to external influences leads to overestimation of stress-strain state parameters of load-bearing systems elements. A simple nonlinear model based on concrete and reinforcement deformation diagrams is considered. Refined data on the resistance of load-bearing systems to torsional effects are obtained. The results of the analysis can be used for creation of torsionally balanced structures of multistory buildings.

Keywords

• torsion
• center of mass
• center of stiffness
• load-bearing systems
• angle of rotation