Improving Torsional Rigidity and Seismic Performance of Tunnel Form Building Structures

Year 2017, , 124 - 134, 26.09.2017

Can Balkaya , İhsan Karagoz , İsmihan Gunal

https://doi.org/10.19072/ijet.307537

Cited By: 1

Abstract

Tunnel form
buildings, which have shear-wall dominant structural systems, are usually built
in countries exposed to substantial seismic risk and very commonly used because
of its fast construction technique and low cost. Very limited research has been
directed to their experimental studies on 3D behavior, seismic performance,
load capacities, collapse mechanisms, and crack propagations. Previous studies
indicate that most of the time the first period of the structure is torsion due
to construction techniques outer faces is open to take the tunnel forms to out
by cranes. This will cause less torsional rigidity, whereas for strong
earthquakes, torsional rigidity has to be increased. Four different strengthening techniques, i.e.,
steel braces, reinforced concrete (RC) infill shear wall, precast concrete
shear wall, and RC shear wall at the façade, were applied to improve torsion rigidity.
Experimental studies and 3D nonlinear finite element analysis (FEA) were
performed on models. The analytical model
results, the economy and applicability of construction techniques suggest that
steel bracing is the most suitable and practical method to improve torsional
rigidity as well as seismic performance. Three-story scaled existing and
strengthened experimental models are tested under pushover loads, and the
results are compared with 3D nonlinear finite element analysis.

Keywords

Tunnel form building, shear wall, experimental study, torsional rigidity, seismic performance, pushover loading

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