box beam

Solution to Problem 595 | Spacing of Rivets or Bolts in Built-Up Beams

Problem 595

595-box-beam-held-by-screws.jpgA concentrated load P is carried at midspan of a simply supported 12-ft span. The beam is made of 2-in. by 6-in. pieces screwed together, as shown in Fig. P-595. If the maximum flexural stress developed is 1400 psi, find the maximum shearing stress and the pitch of the screws if each screw can resist 200 lb.

 

Solution to Problem 594 | Spacing of Rivets or Bolts in Built-Up Beams

Problem 594

A distributed load of wo lb/ft is applied over a middle 6 ft of a simply supported span 12 ft long. The beam section is that in Prob. 593, but used here so that the 8-in dimension is vertical. Determine the maximum value of wo if fb ≤ 1200 psi, fv ≤ 120 psi, and the screws have a shear strength of 200 lb and a pitch of 2 in.

 

Solution to Problem 593 | Spacing of Rivets or Bolts in Built-Up Beams

593 Box Beam Secured by Screws

Problem 593

A box beam, built up as shown in Fig. P-593, is secured by screws spaced 5 in. apart. The beam supports a concentrated load P at the third point of a simply supported span 12 ft long. Determine the maximum value of P that will not exceed fv = 120 psi in the beam or a shearing force of 300 lb in the screws. What is the maximum flexural stress in the beam?

 

Solution to Problem 590 | Design for Flexure and Shear

590 Box beam overhang at one end and loaded with uniform and concentrated loads

Problem 590

A box beam carries a distributed load of 200 lb/ft and a concentrated load P as shown in Fig. P-590. Determine the maximum value of P if fb ≤ 1200 psi and fv ≤ 150 psi.

 

Solution to Problem 586 | Design for Flexure and Shear

586 Beam overhang at one end and loaded uniformly

Problem 586
The distributed load shown in Fig. P-586 is supported by a box beam having the same cross-section as that in Prob. 585. Determine the maximum value of wo that will not exceed a flexural stress of 10 MPa or a shearing stress of 1.0 MPa.

 

Solution to Problem 585 | Design for Flexure and Shear

585 Simply supported box beam

Problem 585

A simply supported beam of length L carries a uniformly distributed load of 6000 N/m and has the cross section shown in Fig. P-585. Find L to cause a maximum flexural stress of 16 MPa. What maximum shearing stress is then developed?

 

Solution to Problem 571 | Horizontal Shearing Stress

570-571 Rectangular box beam

Problem 571

For a beam with the same cross section as that in Prob. 570, plot the shearing stress distribution across the section at a section where the shearing force is V = 1800 lb.

 

Solution to Problem 570 | Horizontal Shearing Stress

Problem 570

Rectangular box beamA uniformly distributed load of 200 lb/ft is carried on a simply supported beam span. If the cross-section is as shown in Fig. P-570, determine the maximum length of the beam if the shearing stress is limited to 80 psi. Assume the load acts over the entire length of the beam.

 

Solution to Problem 564 | Unsymmetrical Beams

Problem 564

Repeat Prob. 563 using 2-in. by 10-in. pieces.

 

Solution to Problem 563 | Unsymmetrical Beams

Problem 563

A box beam is made from 2-in. by 6-in. pieces screwed together as shown in Fig. P-563. If the maximum flexure stress is 1200 psi, compute the force acting on the shaded portion and the moment of this force about the NA. Hint: Use the results of Prob. 562.

 

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