Browsing by Author "Murad Musbah"

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    Effect of Aggregate Size on Shear Strength of Reinforced Concrete Beam-Column Joint
    (Addis Ababa University, 2025-05) Murad Musbah; Esayas Gebreyohannes (PhD); Sadik Muzeyn (PhD)
    The beam-column connection is an important area within reinforced concrete moment frames. Significant shear is likely to be experienced by this connection during strong ground shaking as the loads are transferred from the beam to the column, and the way in which the connection acts can have a significant influence on how the whole structure is going to perform. Much of the literature simplified the connection as behaving rigid, and did not take into account that we have high shear forces concentrated within the connection. Ultimately, failure in shear is very brittle at the connection and we would not want to see this structurally in a seismic region. The performance of beam–column joint comes from proper detailing of reinforcement and the strength of concrete. General property of concrete, strength, and durability, comes from its ingredient. Aggregate is an important element in concrete mixing and the resultant compression and tensile strength. Concrete failure properties are significantly affected when the size of aggregate change. This research will focus on the effect of aggregate size and volume on shear strength of reinforced concrete beam column joint. Generally beam- column joint are areas with relative higher congestion of bars. Hence it will be difficult for concrete to pass. Fine aggregates can reach inside whereas aggregate with larger size difficult to reach inside core concrete. This may cause change in composition inside joint that may cause reduction on shear strength of beam column joint. This research identify how coarse aggregate size affect shear strength of reinforced concrete beam column joint. Based on experimental result of five RC beam–column specimen with 37.5mm, 25mm, 12.5mm, 4.75mm maximum nominal aggregate size and one additional specimen with 25mm but sieved with 9.5 mm sieve mesh at the joint to represent the effect of bar congestion. Using aggregate with a larger size, typically provides higher shear capacity for the joint. In addition to shear capacity, aggregate size also affects the joint behavior after the peak strength is reached. Specimens with larger aggregates typically fail in a more ductile way than those with smaller aggregate. In addition, there is also higher initial stiffness for larger aggregate size specimens. Generally, the roll of aggregate size and volume is found to be critical for the seismic performance of beam column joint.