Reinforced Cement Concrete

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2. Give the abbreviations for the following terms: a. acoustical tile ceiling b. asbestos board c. concrete masonry unit d. manufacturer e. on center_ f. pounds per square inch g. American Wire Gauge h. galvanized i. equal j. schedule


7.3.For the beam in Problem 7.1: (a) Calculate the increment of deflection resulting from the first application of the short-term live load. (b) Find the creep portion of the sustained load deflection plus the immediate deflection due to live load. (c) Compare your results with the limitations imposed by the ACI Code, as summarized in Table 7.2. Assume that the beam is a part of a floor system and supports cinder block partitions susceptible to cracking if deflections are excessive.


1-54 A manufacturing firm has received a contract to assemble 1000 units of test equipment in the next year. The firm must decide how to organize its assembly operation. Skilled workers, at $32 per hour each, can individually assemble the test equipment in 2.7 hours per unit. Alternatively, teams of five less-skilled workers (at 522 per hour each) can assemble a unit in D.8 hours. Which approach is more economical?


2. A rectangular concrete beam is cast with 1-inch maximum aggregate size and measures 15 inches wide and has an effective depth of 21 inches. If the compressive strength of the concrete is 4 ksi and the yield strength of steel reinforcement is 60 ksi: a) Calculate the moment capacity of the beam assuming the reinforcement is 3 #8 bars in one layer b) Assume that Mu calculated from the applied loads and self-weight is 400 k ft. Select the steel network for equilibrium (including number of bars). c) Using your answer for part b, check for all spacing requirements assuming number 3 stirrups are inside and the total beam height is 25 inches. If the steel cage you designed does not fit, re-design the steel cage so all design and ACI requirements are met. d) Calculate the area of steel needed for all following assumed reinforcement ratios. Neglecting the spacing criteria, which of these will options will support Mu? i. Pmin ii. PTC iii.(0.75)Pbal iv. Pbal


A concrete sewer of 400 mm of diameter collects water from an urban catchment. During one of the storms, a depth of d3200 mm was observed in the sewer. The figure below shows the sewer horizontal length and elevation (in m) and the cross section of the pipe (in mm). a. Calculate area, wetted perimeter and hydraulic radius b. Determine its velocity c. Calculate flow rate of the channel d. Calculate its total energy at the end of the channel, considering the mean sea level as vertical datum, and assuming a Coriolis coefficient of 1.2 and draw its energy profile (18 marks)


3. The simply supported beam to the right has a(unfactored) dead load of 1.4 kip/ft plus its own dead load and a (unfactored) live load of 2.4 kip/ft.The concrete strength is 6000 psi and the steel is Grade 50. Use load and strength reduction factors from ACI 318-14 Chapters 5 and 21 determine: a) Compute the factored moment Mu b) What is B1? c) What is pTC? d) Determine b, d and As assuming (h d+2.5 inches). Specify how many bars and what diameter is needed to resist Mu, recalculate M to account for the self-weight of the beam and make sure your design can resist it. Make sure your steel is yielding and your bars have enough room to fit, finally check that your steel is yielding by ensuring your design A, is bigger than Asmin (assume the minimum cover for all bars is 1.5 inches).


4. Design a round spiral column to support an axial dead load of 300 k and an axial live load of 400 k. Begin using 1.5 percent longitudinal steel, a concrete strength of 5,000 psi and Grade 60 steel. (10 points)


1-18 The three economic criteria for choosing the best alternative are maximize the difference between output and input, minimize input, and maximize output. For each of the following situations, what is the correct economic criterion? (a) A manufacturer can sell up to two full shifts of production at a fixed price. As production is increased, unit costs increase as a result of overtime pay and so forth. The manufacturer's criterion should be _________. (6) An architectural and engineering firm has been awarded the contract to design a wharf with fixed performance specifications for a petroleum company. The engineering firm's criterion for its client should be ____________. (c) An off-campus bookstore is choosing its target used'new split for next year. Its criterion should be _________. (d) At an auction of antiques, a bidder for a particular porcelain statue would he trying to _________.


An existing 36-inch diameter concrete sewer installed on a slope of 0.25% currently conveys a peak flow rate of 12 cfs. A new housing development with a projected peak flow rate of 4 cfs is proposed to be connected to this existing sewer. Calculate the following - state all assumptions and show all work a) Depth of flow in sewer before new development is connected b) Depth of flow in sewer after new development is connected c) Flow velocity in sewer after new development is connected d) Specify diameter of a sewer to convey 16 cfs if maximum allowable D/d is 0.60 (assume same 0.25% slope)


For each statement, specify whether it is true or false regarding stages of the design process. 1. Programming and feasibility is the first stage in the design process. 2. Developing detailed drawings is the first stage in the design process. 3. Schematic or conceptual design is the second stage in the design process. 4. Developing construction drawings is the second stage in the design process. 5. Design development is the third stage in the design process. 6. Procurement is the third stage in the design process. 7. Contract documents is the fourth stage in the design process. 8. Creating a punch list is the fourth stage in the design process.


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