As an alternative to the deep foundations, the team leader wants to consider using a grade beam, which would result in much shorter columns. Using a grade beam would allow us to use spread footings,...

As an alternative to the deep foundations, the team leader wants to consider using a grade beam, which would result in much shorter columns. Using a grade beam would allow us to use spread footings, which are less expensive. a. Guess the direction of each of the reactions for each of the column bases. b. What is the most appropriate method for approximate analysis of this frame? Why is that method most appropriate? c. List the assumptions you make in order to perform an approximate analysis of the frame. d. Use approximate analysis to determine the peak positive and negative moments for the cap beam, the grade beam, and each of the columns. e. Use approximate analysis to find the reactions at the base of each column. f. To demonstrate the effectiveness of approximate analysis, use structural analysis software to find the peak positive and negative moments for the cap i. j• Yr~►b. ~).t{ g• beam, grade beam, and each column. Also, find the reactions at the base of each column. In order to provide better corrosion resistance, we guess that the design will be based on a concrete strength of 30 MPa; that results in an estimated modulus of elasticity, E, of 26 GPa = 26 kN/mm2. The team leader suggested trying square members 80 cm deep for both the cap beam and columns (A = 6400 cm2, I = 3.41 x 106 cm4 ) and a square member 120 cm deep for the grade beam (A = 14,400 cm2,1 = 1.728x 10~ cm4 ) . Submit a printout of the displaced shape. Identify at least three features that suggest the displaced shape is reasonable. h. Verify equilibrium of the computer aided analysis results. Are the results of your computer aided analysis reasonable? Make a comprehensive argument to justify your answer. Comment on why your guess in part (a) was or was not close to the solution in part (e).