Wave propagation in a doubly tapered shear beam: Model and application to a pyramid‐shaped skyscraper

2021 ◽  
Author(s):  
Maria I. Todorovska ◽  
Eyerusalem A. Girmay ◽  
Fangbo Wang ◽  
Mohammadtaghi Rahmani
Keyword(s):  
Wave Propagation ◽  
Beam Model ◽  
Shear Beam ◽  
Shear Beam Model

Energy decay for damped Shear beam model and new facts related to the classical Timoshenko system

2021 ◽  
Vol 120 ◽  
pp. 107324
Author(s):  
D.S. Almeida Júnior ◽  
A.J.A. Ramos ◽  
M.M. Freitas
Keyword(s):  
Energy Decay ◽  
Beam Model ◽  
Timoshenko System ◽  
Shear Beam ◽  
Shear Beam Model

An evaluation ofP-Δ amplification factors in multistorey steel moment resisting frames

1999 ◽  
Vol 26 (5) ◽  
pp. 535-548 ◽  
Author(s):  
R Tremblay ◽  
B Côté ◽  
P Léger
Keyword(s):  
Amplification Factor ◽  
Ground Motions ◽  
Beam Model ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frame ◽  
Dynamic Analyses ◽  
Moment Resisting ◽  
Shear Beam ◽  
Nonlinear Dynamic Analyses ◽  
Shear Beam Model

Three different amplification factors that have been proposed to account for P-Δ effects in the seismic design of multistorey building structures are described and compared. Nonlinear dynamic analyses of a typical 20-storey steel moment resisting frame are carried out under earthquake ground motions typical of eastern and western Canada to evaluate the gravity load effects and to assess the effectiveness of each type of amplification factor in accounting for these effects. All three approaches maintain the ductility demand within the level computed without P-Δ effects, but lateral deformations are generally larger than those obtained neglecting the gravity loads. Nonlinear dynamic analyses are also performed on a shear-beam (stick) model of the same building to examine the possibility of using such simple models for studying the dynamic stability of buildings subjected to ground motions. The shear-beam model does not predict adequately the seismic behaviour of steel moment resisting frames for which P-Δ effects are significant.Key words: ductility, earthquake, ground motion, lateral deformation, moment resisting frame, P-Δ effects, push-over analysis, seismic, shear-beam model, stability coefficient, amplification factor.

A twin shear beam model for double chord RHS joints

1986 ◽  
Vol 23 (1) ◽  
pp. 59-67
Author(s):  
H.S. Mitri ◽  
R.M. Korol ◽  
F.A. Mirza
Keyword(s):  
Beam Model ◽  
Shear Beam ◽  
Shear Beam Model

Microcomputer analysis of torsionally coupled multistorey buildings—I. Shear beam model

1989 ◽  
Vol 32 (5) ◽  
pp. 1175-1182 ◽  
Author(s):  
David P. Thambiratnam ◽  
H.Max Irvine
Keyword(s):  
Beam Model ◽  
Shear Beam ◽  
Shear Beam Model

On-line adaptive observer for buildings based on wave propagation approach

2017 ◽  
Vol 24 (16) ◽  
pp. 3758-3778 ◽  
Author(s):  
Jesús Morales-Valdez ◽  
Luis Alvarez-Icaza ◽  
Antonio Concha
Keyword(s):  
Wave Propagation ◽  
Least Squares Method ◽  
Health Assessment ◽  
Observer Design ◽  
Adaptive Observer ◽  
Recursive Least Squares ◽  
Beam Model ◽  
Line System ◽  
Shear Beam ◽  
On Line

A novel on-line system identification method for shear beam building models, based on a wave propagation approach, is developed as an alternative solution to modal analysis methods for the health assessment of multi-story buildings. A discrete shear beam model is introduced that is used to design an adaptive observer, allowing for the estimation of displacements and velocities, as well as the unknown shear wave velocities and damping coefficients in real-time. The adaptive observer design is based only on acceleration measurements, does not need a coordinate transformation, and uses the normalized recursive least squares method with forgetting factor and a parameter projection scheme to achieve stronger convergence. Moreover, the proposed identification scheme employs a novel parameterization based on linear integral filters, which eliminates constant disturbances and attenuates measurement noise. The algorithm efficiency is demonstrated through experimental results on a reduced scale five-story building.

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