Part (a) Determine the maximum load (Pu) that the given beam can hold. The loads w₁ and Pu already have load factors incorporated; you do not need to include them in the calculation of Mu. (dimensions in meters) f=28 MPa, fy-420MPai 5.4 3.6 w₁ =14.6 kN/m 9 m THIT 0.4 0.45 0.6 Part (b) The load value (Pu) calculated in part (a) needs to increase by 15%. Back-calculate how much each of the five variables (fc, fy, As, b, d) would need to change in order to achieve the 15% increase. Select the variable you think is most efficient and make a recommendation. Part (c) Somebody decides that the load increase from part (b) was unnecessary, but that the ductility (&) of the beam in part (a) needs to increase by 20%. Perform another analysis to determine how each variable would need to change. Which variables can be changed (without sacrificing strength) in order to achieve the change? Part (d) Determine the maximum amount of steel (As,max) that can be put in the beam without violating ACI restrictions. What is the moment capacity (M.) with this much steel? Part (e) Determine the minimum amount of steel (As,min) that can be put in the beam without violating ACI restrictions. What is the moment capacity (Mn) with this much steel?