Shear Capacity of Hollow Reinforced Concrete Members without Stirrups

Abstract

This paper presents experimental results on the shear capacity of hollow reinforced concrete members without stirrups. The area of the hollow was 2.32% of the concrete cross-sectional area. The hollow size used in this study is smaller than the maximum percentage required in the code, where the maximum hollow area was 4% of the total cross-sectional area. The longitudinal reinforcement used in the specimen varies with the three types of reinforcement ratios. The test was carried out using the four-point shear test to achieve the expected shear failure mode. The loading was given monotonically until the specimen failed. Analytical flexural capacity was also calculated using the fiber element method. The specimens failed in shear failure mode, indicated by large diagonal cracks in the observed shear span. The influence of the hollow on the shear strength was also compared with the theoretical shear capacity proposed by the code. This comparison shows that the calculated theoretical shear capacity is conservative for hollow reinforced concrete structural elements with a hollow area smaller than 4%. The results of the flexural analysis show that all the specimens did not reach the flexural capacity due to premature shear failure.

Tensile Forces Behavior on Longitudinal Reinforcement and CFRP Strips on Circular Hollow Reinforced Concrete Columns

“…This reference reported that the flexural capacity of specimens with closed spiral stirrups and hoops was almost the same, but the ductility of spiral hoops was slightly higher.Shear failure is a sudden collapse that must be anticipated because it is extremely dangerous due to its brittle and sudden occurrence. This premature failure is typically caused by insufficient crosssectional area and shear reinforcement to withstand shear, as well as other factors that reduce shear capacity.[12], [13], [14], and [15]. Due to changes made to the rules of the current seismic code,…”