Influence Of Masonry Strength And Rectangular
Spiral Shear Reinforcement On Infilled RC
Frames Under Cyclic Loading
Author(s)
D. J. Kakaletsis
Abstract
The effect of two types of shear reinforcement of the concrete members and two
types of masonry infills on the seismic performance of reinforced concrete (RC)
frames was experimentally investigated. Six single-story, one-bay, 1/3-scale
frame specimens were tested under cyclic horizontal loading, up to a drift level
of 40‰. Bare frames and infilled frames with weak and strong infills were sorted
into two groups: Specimens of group A had stirrups while specimens of group B
had spirals respectively, as shear reinforcement. The frames were designed in
accordance with modern codes provisions. The types of masonry infills had
different compressive strength but almost identical shear strength. Infills were
designed so that the infill lateral cracking load is less than the available column
shear resistance. The results from the specimens of group A were compared with
the results from specimens of group B, in terms of hysteretic response, ductility
and energy absorption. From the observed responses of the tested specimens it
can be deduced that the use of rectangular spiral reinforcement in the beam and
columns, even in the case of strong infills, improved the seismic capacity of the
examined infilled RC frames.
Keywords: infilled R/C frames, masonry strength, spiral shear reinforcement.
1 Introduction
From the experimental investigations that were carried out by several
researchers, [1–4], it has been shown that the presence of infill panels improves
the seismic performance of a frame. The stronger the infill and the frame is, the
higher is the seismic resistance (Mehrabi et al [5]). However the brittle shear
failure of columns which might jeopardise the stability and repairability of a
Keywords
infilled R/C frames, masonry strength, spiral shear reinforcement.
Related Book
Other papers in this volume
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