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Steel structure

The two-bay portal frame shown can be subjected to either of the following load systems:

OA horizontal load of 2W at B and a vertical load of 3W at the centre of span CD

(b) A horizontal load of 2W at B and a vertical load of 3W at the centre of spanВС.

If the plastic moment of the beams is 1.5 Mp and that of the columns M, calculate the minimum value of W which would cause collapse of the structure.Sketch the bending moment diagram of the structure at collapse indicating significant values.

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Steel structure

.The shaft shown in the figure is machined from AISI 1040 CD steel. The shaft rotates at 1600rpm and is supported in rolling bearings at A and B. The applied forces are F1 = 2500 Ibf andF2 = 1000 lbf. Determine the minimum fatigue factor of safety based on achieving infinite life.If infinite life is not predicted, estimate the number of cycles to failure. Also check for yielding.

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Steel structure

2. For the interval 10 3 <N< 10° cycles, develop an expression for the axial fatigue strength (S'fJaxial for the polished specimens of 4130 used to obtain the figure below. The ultimate strength is Sut = 125 kpsi and the endurance limit is (S'e)axial = 50 kpsi.

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Steel structure

1. A steel rotating-beam test specimen has an ultimate strength of 230 kpsi. Estimate the fatigue strength corresponding to a life of 150*103 cycles of stress reversal.

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Steel structure

2. Describe the stages of fatigue failure

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Steel structure

1. Define fatigue strength and endurance limit

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Steel structure

The preferred material specification for W-shapes is

О с. А625

d. A992

O a. A500

b. A365

e. А100

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Steel structure

What is the LRFD design yielding limit strength (kips)for a HSS 4x4x3/8 for A500 Gr. B?

O a. 249 kips

O b. 57.9 kips

e. 198 kips

O c. 196 kips

d. 73.3 kips

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Steel structure

An office in the city is subject to dead loading of 50psf and a live loading of 70 psf. Determine the maximum load combination in "psf" assuming no roof, snow, wind, seismic, and nominal loading (psf:pounds per square foot) from the equations given below:

С. 45

O d. 70

O b. 120

O a. 172

О е. 130

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Steel structure

What is the effective net area (in2) of a gusset plate with a total thickness of 0.75 inches used for Tension that has ten bolted holes given a GrossArea of 30 in² and a nominal bolt diameter of 0.125inches. The given pitch "s" is =0.35 inches and the gage "g" is = 0.15 inches

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