Can the Diameter of Longitudinal Bars of Extreme Edges of R/C Walls Halt Transverse Buckling?

Can the Diameter of Longitudinal Bars of Extreme Edges of R/C Walls Halt Transverse Buckling?

One important aspect of seismic design of buildings with a dual reinforced concrete structural system is the lateral stability of structural walls, when they face this danger mainly due to flexural overstrain. The deep excursion in the yield region of the boundary parts of bearing walls increases dramatically their flexibility and since at the same time they are liable, because of the earthquake vibration, to a reversing axial loading (tension – compression), their lateral stability is at stake. The possibility of failure because of lateral instability is limited significantly with the proper choice of an adequate thickness, which is specified by (most) modern seismic codes as a percentage of the height of the bottom storey. The current work investigates one parameter that may be affecting the stability of structural walls. This parameter is the diameter of the longitudinal reinforcement of the boundary edges of load-bearing walls. It contains an experimental research that tries to investigate the influence of the diameter of longitudinal reinforcement to the ultimate bearing capacity of test specimens. It has to be noted that in order to examine experimentally the influence of the diameter of longitudinal reinforcement, test specimens of scale 1:3 simulating the boundary edges of structural walls were used. These specimens were reinforced with the same or almost the same longitudinal reinforcement ratios (2.68% – 2.79%) but had a different number of reinforcement bars of varying diameter. The diameters of bars which were used were equal to 8 mm and 10 mm. The specimens which were compared to each other contained (apart from bars of different diameter) a different number of bars and consequently a different way of placement of these bars at the wall end sections.

Author (s) Details

Theodoros Chrysanidis
Laboratory of Reinforced Concrete and Masonry Structures, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.

Ioannis Tegos
Laboratory of Reinforced Concrete and Masonry Structures, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece

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