INVESTIGATION OF STRONG COLUMN – WEAK BEAM RATIO IN MULTI-STOREY STRUCTURES

Year 2018, Volume: 19 Issue: 2, 242 - 252, 31.03.2018

HANDE Gökdemir , AYTEN Günaydın

https://doi.org/10.18038/aubtda.359828

Abstract

It
is expected that the engineering constructions should carry the vertical and
horizontal loads during the service within the determined safety margin. Basic
principal of having strong column weak beam preference is essential for
earthquake resistant structures for all construction types including concrete,
steel, wood and prefabricated. The major criteria for having earthquake
resistant structure is to ensure that the columns are stronger and carry the
most load than the beam in the nodes. This criterion has been widely adopted in
earthquake codes in Europe, USA,
Japan and India. It is possible to absorb and
consume the earthquake energy via beam plastic joint hinges if the columns are
constructed to be more durable than the beams. For this, it is foreseen that
the ratio of the ultimate strength of the upper and lower columns to the right
and left beams (β) should be greater than one (β = 1.2) in the beam-column
joints as stated in the Turkish Earthquake Code. This coefficient is usually
greater than 1.2 in the earthquake codes
adopted in the world. It was observed that many structures were damaged or
collapsed due to not meeting the coefficient criteria stated above. This
criterion is the most effective one among many to prevent the damage in the
structure under seismic action. In this study, the effect of the change in the
coefficient on the column and beam moments is investigated under the Turkish
Earthquake Code. Different numerical examples are presents for the coefficient
of 10. The results of the investigation highlighted that irregularity in the
strong column weak beam composition may negatively affect the other
irregularities in the structure.

Keywords

Strong column – weak beam, beam-column joint, plastic hinge, ultimate strength

References

• Prof.Dr.Hasan Gönen, Eskisehir Osmangazi University, Department of Civil Engineering, Eskisehir, [e-mail] Prof.Dr.Eşref Ünlüoğlu, Eskisehir Osmangazi University, Department of Civil Engineering, Eskisehir, [e-mail]