Torsional effects through mass asymmetry : A state-of-the-art review

Abstract

Asymmetric distribution of mass over the floor slabs can cause torsional effects in buildings, even when it is symmetric in strength and stiffness. Such systems are referred to as mass eccentric or mass asymmetric buildings. Eccentricity in mass can result in building rotation in addition to its normal translation modes, which can further cause unpredictable deformation and even failure of the building under seismic loads. Irregularity in mass is found in buildings having concentrated mass elements in certain floors such as water tanks, machinery, etc. Many researchers have attempted to study the behavior of asymmetric buildings in general, but very few on the specific topic of mass asymmetry. This paper attempts to review and consolidate the literature written on the topic of mass asymmetry to the author’s knowledge.