Numerical Analysis for Shear Strength of Composite Box Steel-Concrete Beam Transverse Intermediate to Large Openings

This research paper presents a numerical analysis of composite box steel-concrete beams with transverse intermediate to large openings, conducted using the ABAQUS program. The study focused on various parameters, including opening size, shape, location, shear span to effective depth ratio, compressive strength, and diameter of rebars, to understand their effects on the shear load capacity of the beams. The results demonstrated a strong agreement with experimental data, with a correlation ranging from 0.927 to 1.023. Key findings include Increasing the opening size from 90x90 mm to 110x110 mm and from 110x110 to 136x136 led to a 12.7% and 42.4% respectively decrease in shear load, Changing the shape of openings from square to circular decreased the shear load by 14.7% for 90 mm openings and 14.2% for 110 mm openings, while increased the shear load by 15.25% for 136 mm. Moving transverse openings closer to the loads by 126 mm reduced the shear load by 7.5% for 90x90 mm openings, 9.8% for 110x110 mm openings and 17.2% for 136×136 mm openings. The difference in shear load between the highest and lowest (a/d) ratios is 12.5% for 90×90 mm openings, 7.2% for 110×110 mm openings, and 0.8% for 136×136 mm openings. Beams with a compressive strength of 37.5 MPa showed higher shear loads compared to those with 30 MPa, with increases of slight change, and the shear load increased of slight change for beams with reinforcement (2ø25-2ø16) compared to those with (3ø16) for 90x90 mm openings, 110x110 mm and 136x136 mm openings.