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Assalam O Alykum Can anybody give there perspective Flexural cracks are appeared based on the self weight of beam and slab of 150mm thickness after 1 month of casting 11.24m span in one of the site under construction designed by third party consultant. Beam size is 60x50 ( Width x Depth) Bottom & top reinforcement 12T20 and rings T10@150c.c through out the length of span. Compressive strength of concrete 30 MPA cylindrical. I estimate the following causes 1. Depth of the beam provided 500mm does not full fill the criteria given by ACI code for providing minimum thickness of beam. Say L/16 = 700mm is required. 2. Bending / cracks appeared at the center , that can be find out by plastering the beam (the most critical one), if the material coming at the center is less than the other areas, it can confirm the deflection problem. 3. Structure of the beam might work as a frame. However the column orientation at grid line 2/5,3/5 and 5/5 along the minor direction, that will not work as a proper fixation at the column (Top tension zone) location that can increase the bending moment / deflection along the tension zone at the center and possible reason of cracks. Structural drawing is also attached for comment