Title Preboard 1 - PSAD (no answer).pdf ✅

Principles of Structural Analysis and Design Preboard for Civil Engineers Page 2 of 6 E N G R. H L D C Civil Engineering Tutorials Situation 7: Refer to figure PSAD – 004. The rectangular footing shown is subjected to an axial load of P = 1,200 kN and a moment of M = 360 kN-m. It is required to determine the safe gross bearing capacity of the soil to support the given loads. The unit weights of concrete and soil are 23.5 kN/m3 and 18 kN/m3, respectively. 19. Determine the maximum foundation pressure in kPa. a. 274 c. 287 b. 256 d. 321 20. Determine the minimum foundation pressure in kPa. a. 69 c. 82 b. 64 d. 54 21. Determine the minimum required gross allowable soil bearing capacity to carry the given loads. a. 310 c. 290 b. 280 d. 300 Situation 8: Identify the property of the material described by the following: 22. The material deforms considerably even with a slight increase in stress. a. Yielding c. Strain Hardening b. Fracture d. Breaking 23. The material regains its original dimensions when the load is removed. a. Resilience c. Plasticity b. Buckling d. Elasticity 24. The material deforms in the plastic range without breaking. a. Elongation c. Resilience b. Ductility d. Stiffness Situation 9: Refer to figure PSAD – 005. Due to architectural requirement, a column is of T- section as shown in the figure. Given: AS1= 6 – 25 mm diameter bars AS2= 4 – 25 mm diameter bars h1= 250 mm h2= 450 mm b1= 200 mm b2= 300 mm f’c= 28 MPa fy= 415 MPa 10 mm diameter ties Clear concrete cover = 40 mm Assume that for all bars, fs = fy 25. Determine the distance of the plastic centroid of the section from line 1 along x-axis? a. 350 mm c. 256 mm b. 313 mm d. 286 mm 26. Determine the location of the geometric centroid from line 1 along x-axis? a. 318 mm c. 232 mm b. 188 mm d. 277 mm 27. If Pu = 4,155 kN acts along the x-axis at 420 mm to the right of line 1, calculate the resulting bending moment. a. 556 kN-m c. 2,934 kN-m b. 594 kN-m d. 2,896 kN-m Situation 10: Refer to figure PSAD – 006 and RC - 1. A reinforced concrete building floor system consists of a continuous beam as shown in the figure. The ultimate uniformly distributed load it carries is 10 kN/m. L = 4.5 m Column = 500 mm x 500 mm (assume point A is resting on a 500 x 500 column) Spandrel beam, b x d = 300 mm x 500 mm 28. Determine the moment at point B. a. 11.4 kN-m c. 10.0 kN-m b. 14.5 kN-m d. 7.0 kN-m 29. Determine the moment at point O. a. 11.4 kN-m c. 10.0 kN-m b. 14.5 kN-m d. 7.0 kN-m 30. Determine the moment at point I. a. 11.4 kN-m c. 10.0 kN-m b. 14.5 kN-m d. 7.0 kN-m Situation 11: A block slides down a plane inclined downward at an angle of 30° with the horizontal. The coefficient of kinetic friction between the block and the plane is 0.25. The block is initially at rest and its bottom is 6 m higher than the ground. 31. Determine the acceleration of the block. a. 2.78 m/s2 c. 3.98 m/s2 b. 1.85 m/s2 d. 4.54 m/s2 32. Determine the velocity of the block after it travels a vertical distance of 3 m. a. 4.12 m/s c. 3.25 m/s b. 5.78 m/s d. 2.85 m/s 33. Determine the time it will take before the block hits the ground. a. 1.45 s c. 2.94 s b. 3.58 s d. 4.57 s Situation 12: A horizontal water supply pipe is suspended from a cable using a series of close and equally spaced hangers. The length of the pipe supported by the cable is 60 m and the total weight of the pipe if filled with water is 6.80 kN/m. 34. What is the maximum sag at the lowest point of the cable which occurs at mid length if the allowable tensile load in the cable is 2,550 kN? a. 1.20 m c. 1.15 m b. 0.98 m d. 1.08 m 35. If the sag of the cable at mid length is 3 m, find the maximum axial stress in the cable. Cable diameter is 75 mm. a. 236 MPa c. 259 MPa b. 288 MPa d. 301 MPa 36. If the sag of the cable at mid length is 2 m and the allowable tensile load in the cable is 2,000 kN, how much additional load can the cable carry? a. 2.01 kN/m c. 8.81 kN/m b. 3.77 kN/m d. 6.80 kN/m