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Question 44410

posted 10 months ago

1. (50 points) Determine Mn for a beam of cross section shown in figure 1, where f'c = 4 ksi.Assume fy = 60 ksi. Calculate the strain on steel when the concrete strain is 0.003 and compare it with yield strain of steel. Es = 29x10³ ksi

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Question 44411

posted 10 months ago

2. (50 points) Determine if the beam shown in the figure is adequate as governed by the ACICode (318-11). The loads shown are service loads. The uniformly distributed load is DL = 0..72+o.Fkip/ft., LL+0.83 +0.E= kip/ft the dead load excludes the beam weight the point is a live load f.c 4000psi fy=60000 psi

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Question 44620

posted 10 months ago

A structural engineer has hired you to design square concrete unembedded footings for a building, based only on capacity. Each footing will hold an axial load of 340 kN. Your technicians have conducted lab tests on specimens sampled from the site, and they report the following profile: a 0.8m thick clay layer over a 7m thick clayey silt layer (the clayey silt layer lies over rock). The lab report reveals that the clay has a friction angle of34 degrees and an undrained strength of 35 kPa, and that the clayey silt has a friction angle of 37 degrees and an undrained strength of 45 kPa.
Determine the size of one of the footings, in meters, such that the critical actor of safety against a capacity failure is as close to 3 as possible, but still larger than 3 and smaller than 3.2. The other (non-critical) factor of safety must be greater than 3. Express your answer with a resolution of 0.1 meters. That is, values of B of1.2, 2.3, 3.4m, etc., for example, are acceptable, whereas B values of 1.21, 2.32, 3.43m, etc., for example,are not.
Show all your work, organized, and circle your answer for B.

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Question 44619

posted 10 months ago

6. A structural engineer has hired you to design square concrete unembedded footings for a building, based only on capacity. Each footing will hold an axial load of 215 kN. Your technicians have conducted lab tests on specimens sampled from the site, and they report the following profile: a 0.6m thick sand layer over a 7mthick gravel layer (the gravel layer lies over rock). The lab report reveals that the friction angle of the sand is37 degrees, and that of the gravel is 42 degrees. Determine the size of one of the footings, in meters, such that the short term factor of safety against a capacity failure is as close to 3 as possible, but still larger than 3and smaller than 3.2. Express your answer with a resolution of 0.1 meters. That is, values of B of 1.2, 2.3,3.4m, etc., for example, are acceptable, whereas B values of 1.21, 2.32, 3.43m, etc., for example, are not.Check your answer with this one: Answer: B = 1.4m (FS = 3.15).

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Question 44749

posted 10 months ago

What is the volume of (42+x =) ft. long W 33 x 318 steel section?

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Question 44752

posted 10 months ago

4. (10 points) Find the most economic column section for BE (Note: you are asked to design only column BE) in the following loading condition. The ends “A" of simply supported beam AB and cantilever AC rest on the end “A" of AD, which means AD will have to support the load applied on it directly plus the portions of load at A due to beams AC and AB. Assume the loads transferred by the beams AC and AB are vertical.

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Question 44750

posted 10 months ago

(15 points) In the simply supported beam AB below, please find the maximum moment,maximum shear and maximum deflection and indicate where they occur.

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Question 44751

posted 10 months ago

3. (20 points) Find the most economic beam section for the following loading condition based on flexure ONLY. Note that there is a bracing at the center of the span. Neglect beam's self-weight.

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Question 44753

posted 10 months ago

5. (20 points) Determine the net area of the W12x22 shown in the figure below if the holes are for 7/8 in, bolts.

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Question 45400

posted 10 months ago

3) For the beam given below, calculate reactions at both supports A and B. Draw the shear and moment diagrams. Label the maximum magnitude shear and moment values on the diagrams. (Maximum magnitude means maximum absolute value, positive or negative).Assume that the self-weight of the beam is negligible. (20 pts)

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