reinforced concrete spiral column carries dead axial load of 600 kN and a live axial load of 9000kN. f’c = 28 Mpa; fy = 415 Mpa. a. What is the factored axial load carried by the column? b. What is the minimum diameter of the column if it has a steel ratio of 0.015? c. Find the number of 20 mm diameter bar that will be used if it is the reinforcement of the column.

Situation #1: A reinforced concrete beam has a width of 300 mm and an overall depth of 550 mm. The beam is reinforced with five 25-mm diameter bottom bars and two 16-mm-diamter bars, both having fy = 345 MPa. Concrete strength fc' = 24 MPa. The centroid of the bars are located 65 mm from extreme concrete fibers. Unit weight of concrete = 23.5 kN/m3. The beam is simply supported over a span of 6 m and carries a superimposed deadload of 8 kN/m. Use NSCP 2010 1.1 What is the depth of compression block? 1.2 What is the stress of the compression steel? 1.3 What is the nominal capacity of the beam? 1.4 What safe uniformly distributed live load can the beam carry over its entire length? 1.5 Using the loads obtained from the previous questions, what is the required nominal shear strength of the beam at critical section near the support? 1.6 Using 10 mm U stirrups with fy = 275 MPa, what is the required stirrup spacing near the support.

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