Problem 3 - 103 Freshly poured concrete approximates a fluid with sp. gr. of 2.40. The figure shown a wall poured between wooden forms which are connected by six bolts. Neglecting end effects, compute the force in the lower bolts. 10 in Ans: 19,170 lbs 12 ft Concrete 8t
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- Assume wet concrete (gamma=150lbf/ft3) behaves as a liquid. Determine the force per unit foot of length exerted on the forms. If the forms are held in place as shown, with ties between vertical braces spaced every 2ft, what is the force exerted on the bottom tie?1. The aluminum block has a rectangular cross section and is subjected to an axial compressive force of 8 kip. If the 1.5-in. side changed its length to 1.500132 in., determine Poisson’s ratio and the new length of the 2-in. side. Eal = 10(103 ) ksi.A cast iron 3m long is completely filled with concrete and used as a vertical strut. If the externaldiameter of the tube is 450mm and the wall is 35mm thick, determine the maximum compressiveload the composite strut can support if the stress in the concrete is not 2N/mm2? By how muchshould the strut shorten under this load? For cast iron EA= 100GN/m2 and for the concrete EB=10GN/m2?
- The column shown is strained to -0.003 on the right hand edge and to +0.002 on its left hand edge. f’c = 4000 psi and fy = 60,000 psi. determine: 1. gives the compressive force resisted by the concrete 2. gives the nominal axial load that the column could carry 3. gives the nominal flexural load that the column could carryDetermine the Pn of the following column assuming it had no moment on it and only an axial compression force: (f’c = 6000 psi, Grade 60 bars, h = 20”, b = 12” (i.e. rectangular section), tied column). Do not worry about calculating φ (phi factor). You can assume it is a short column. Also assume a reinforcement ration of 2% (ρg = 0.02).1. A form for a large cast-in-place concrete wall is 13 ft. high. Concrete will beplaced using a 42 meter pump at the rate of 6 vertical ft. per hour. Theconcrete temperature is anticipated to be 80^o F. a) Draw a neat sketch of the concrete pressure diagram when the concretehas reached full height. Clearly show all key dimensions in ft. andpressure values in #/sf.
- A spiral column carries a service dead load of 1000 kN and a service live load of 900 kN. fc' = 27.5MPa and fy = 413.5 MPa. Using a steel ratio of 0.03 a. What is the diameter (mm) of the spiral column?b. How many pieces D28 longitudinal reinforcement is required?c. Determine the possible spacing (mm) of the 10 mm spirals assuming a 40 mm concrete cover.2.The concrete post in Fig. (a) is reinforced axiallywith four symmetrically placed steel bars, each ofcross-sectional area 900 mm2. Compute thestress in each material when the 1000-kN axialload is applied. The moduli of elasticity are 200Gpa for steel and 14 Gpa for concrete.4. If the width of the bedplate is 3m and the clearance is 0.3 what is the upper width of the machine foundation
- Calculate the weight of the wall from the given Cross Section by considering the unit weight ofreinforced and plain concrete as γc=2Y kN/m3.Reinforced And Prestressed Concrete Instructions: Solve all problems completely. If assumptions are made, verify if the assumption are correct. No verification of assumption leads to loss of points. PROBLEM: A reinforced rectangular beam with width b and effective depth d has 4.16 mm bars placed on 1 layer at the tension side. The beam has a stirrup with a diameter of 10 mm. Use fc=28 Mpa and fy=420 MPa GIVEN: b= 197.5 mm d= 317.5mm L= 2.7 m Wd = 13.75 kN/m WL = 17.75 kN/m Calculate the nominal moment capacity of the beam Calculate that strain of the tension bars. Calculate the strength reduction factor of the beamIf column AB is made from high strength pre-castconcrete and reinforced with four 20 mm diameter A-36steel rods, determine the maximum allowable floorloadings P. The allowable normal stress for the highstrength concrete and the steel are (ϭallow)con = 18 MPaand (ϭallow)st= 170 MPa, respectively.