Influence of Opening Ratio and Position in Infill Wall on Constitutive Law of Equivalent Compression Strut

Year 2019, Volume: 3 Issue: 2, 57 - 64, 10.10.2019

Onur Öztürkoğlu , Taner Uçar

Abstract

Infill
walls are widely used in any building to create a separation between spaces
intended for different purposes. In general, partial openings exist in infill
wall with different opening ratio and position due to architectural
considerations, functional needs and aesthetic concerns. In current practice,
buildings are considered as bare frames ignoring infills and openings. However,
infill walls and partial openings may significantly affect the seismic behavior
of structures. Equivalent compression strut model is frequently used in
modelling of infill walls for structural analysis. Accordingly, the
force-displacement (F–D)
relationship of equivalent compression strut is quite important in nonlinear
analysis of infilled frames. In particular, opening sizes and position are
essential parameters in order to properly constitute F–D relationship of infill wall with openings simulated by
means of an equivalent compression strut. In this study, F–D relationship of
equivalent compression strut is determined for different opening ratios and
positions in infill wall considering three different F–D relationship models available in the literature. The
maximum strength of equivalent compression strut and the corresponding
displacement, the compression cracking force and the corresponding
displacement, the residual strength and the axial compressive stiffness of the
strut are compared and discussed for different constitutive F–D laws. It is found
that force values of F–D
relationships decrease as opening ratio increases. However, displacement values
are not generally effected by opening ratio or position. Furthermore, openings
upon the diagonal are more influential on F–D relationships of equivalent compression strut in
comparison to other opening positions.

Keywords

Infill walls with openings, Opening ratio and positions, force-displacement relationship, equivalent compression strut

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