Effects of Pit-Sand on Resistance Capacities of Reinforced Concrete Space Framed Structures

Abstract

This paper used the existing formulae in estimating resistance parameter of reinforced concrete structure to assess the effect of concrete produced from pit-sand in Akure metropolis, on the resistance parameters of a collapsed building in Oba-Ile, Akure. Site inspections were carried out on the collapsed building, and concrete samples were taken. Both destructive and non-destructive methods were used to determine the structure's concrete strength. The number of reinforcements in each structural element was determined by exposing them. Resistance parameters such as moments of resistance for slab (MRS), for beam (MRB) and shear capacity (VC) of the structural elements were estimated using existing formulae and, compare the results with the structure's actual resistance parameters. The average concrete strength was 8.5 N/mm 2 which was less than 20 N/mm 2 , the prescribed concrete strength for construction of the building. The estimated resistance parameters MRS, MRB and VC based on 8.

Effects of concrete grades on strength characteristics of reinforced concrete slender beams

“…Reinforced concrete beams can fail by bending, by shearing or by flexural-shearing mode of failures. Olanitori and Afolayan (2014) noted that, most reinforced concrete structures failed by shearing, and this is because there exist discrepancies between estimated shear capacity based on equations from the codes and, the actual shear capacity and concluded that more research work should be conducted on models that can predict the shear capacity of reinforced concrete beams more accurately. Olanitori and Olotuah (2005), noted in their study, that targeted concrete strength may not be achieved due to the silt/clay content in the fine aggregate.…”

Physical-Mechanical Properties of Sand from Various Sandpits in the North West Region and Their Recommended Domains of Application

“…The sand should be free from impurities like clay, silt and organic matter, (BS EN 13139). A high content of clay and silt causes a significant reduction in the compressive strength of the concrete (Olanitori, 2006). The Mfs is one of the physical properties of sand (Purwandito et al, 2018) and is used in specifying the proportions of fine and coarse aggregates when designing concrete mixes (Dhir et al, 2017).…”

Mode of Collapse of Square Single Panel Reinforced Concrete Space- Framed Structures With Rigid Beam-Column Joints

“…Also, Olanitori and Afolayan [21], in their investigative work on the causes of the collapse of a building which was detailed and constructed as rigid joints in Nigeria, noted that the actual shear capacity of the building was 18.88 kN, while the predicted shear capacity was 64.4 kN. This wide variance of about 241% between the actual and predicted shear capacities calls for more research into the behavior of reinforced concrete space-framed structures.…”