Torsional Response Induced by Lateral Displacement and Inertial Force

Frontiers in Built Environment

Yokoyama, Hiroki¹  Kohiyama, Masayuki¹ 

[1] Department of System Design Engineering, Keio University, Japan

关键词: Torsional response;    Q-Delta effect;    Geometric nonlinearity;    Large displacement;    Lateral force;    High-rise building;   

DOI  :  10.3389/fbuil.2018.00038

学科分类：建筑学

来源: Frontiers

【 摘 要 】

Eccentric distribution of stiffness, damping, and mass of a structure, and spatially non-uniform ground motion input to a long or large base mat of a structure are well-known causes of torsional response. We have discovered that the torque generated by horizontal displacement and perpendicular inertial force, which we call the Q- effect, can be a cause of torsional response. We formulated the equation of motion of a single finite-size mass-linear elastic shear and torsion spring model and clarified the resonance condition of the torsional response to sinusoidal ground acceleration. Time-history response analysis verified that the torsional response forms beat and the maximum torsional response of the simulation result agrees with that theoretically predicted. Further time-history response analysis conducted of white noise ground acceleration showed that even one-directional white noise ground acceleration can induce torsional response in a linear elastic system without any structural eccentricity.

【 授权许可】

CC BY