2nd: A simply supported 14-m span beam, 300-mm wide by 540-mm deep, is pre- stressed by straight tendons with Aps = 774 mm² located 70 mm from the bottom at an initial prestress of 1.10 GPa. Calculate the concrete stress in MPa at the bottom fiber of the beam at midspan immediately after the tendons are cut. Write your answer in 2 decimal places only. Use unit weight of concrete 24 kN/cu.m. Sign convention is (+) tension, (-) compression. Indicate the sign in your final answer.

Determine if the concrete mass gravity wall shown below is safe by calculating factors of safety against sliding, overturning, and bearing capacity. Use the following in your analysis: H1 = 15 ft H2 = 3 ft Bi = 10 ft B2 = 3 ft Yconc = 150 pcf B = 15° Y = 130 pcf $= 35° 8 = 20° B2 • H2 B1

Given the properties of a reinforced concrete beam with section below: Unit weight of concrete = 24 kN/m3 %3D • Concrete compressive strength = %3D 34.5 MPa Steel yield strength = 420 MPa %3D b = 250 mm ; width of the beam h = 500 mm ; depth of the beam %3D %3D Steel area = 4-28 mm o Diameter of stirrups 12 mm %3D Calculate the following: 1. Reduction factor o 2. Moment Capacity (nominal) of the beam in kN-m 3. Assuming the beam to be simply supported with 7 m span, determine the maximum concentrated dead load that it can carry at midspan along with it's self-weight in kN

29 A square footing 2.2 m x 0.39 m thick supports a 300 mm square column at its center. Column loads are service conditions: DL = 317 kN LL = 217 kN f’c = 21 MPa fy = 415 MPa Concrete cover to the centroid of steel reinforcement = 100 mm Calculate the nominal one way shear stress in the slab. Write your final answer with 2 decimal places if the unit is MPA.

g. Minimum width B (in meter) of wall to be safe against overturning if factor of safety against overturning is 1.5 (minimum). Consider 24 kN/m3 as the unit weight of concrete. B = Note: Round your answer to three decimal place. Thankyou

1- For the floor system shown in Figure below, support service live load 4KN / (m ^ 2) and service dead load 5KN / (m ^ 2) Answer the flowing. Classify the floor system into one way or two-way solid slab. 2- What is the minimun slab thickness that should be used to control deflection and shear requirement ? 3- By using Ø 12 mm rebar, what is the required positive and nagative reinforcement? 4- Sketch the detail of reinforcement. Use : fy = 400Mpa , f c ^ prime =30 Mpa 6.00 m 6.00 m6.00 m 3.00 m 0.30 m АB 3.00 m 3.00 m

Determine the maximum live load that can be applied on one way slab shown in Fig. (1). The slab is reinforced with main reinforcement of $12@150 mm at top and bottom f = 25 MPa, fy = 400 MPa, Wa = slab weight + 40mm tiling Slabthickness = 180 mm All columns = 300*300 mm All beams = 300 * 600 mm 0.3 H 11 11 11 11 7m 11 11 10.3 3m = 0.3 3m 10.3 Fig.(1) 0.3 +H

Based on the following figure, check for beam shear? In one-way and two-way shear. L= 10' Given: 14" + d qu = 11 ksi Fc' = 3 ksi B= 10' d Column dimension (14 x 14) in Using normal weight concrete d=30"

PROBLEM 1: The continuous floor beam ABCD is shown in the figure. It has a 100 mm slab thickness and the beams bxh is 300 mm x 500 mm. Column section is 0.30 m x 0.30 m. Live load = 3.6 KPa Superimposed Dead load = 2.6 KPa Concrete weighs = 24 KN/m3 L = 8 m. S = 2.8 m. 2.8 2.8 Siahs. neglet the live load Reduchon O Compute the positive moment for beam EF. 2.8 M 8 m 8 m 8 m Compute the negative moment at the face of support E Compute the negative moment at F