Unsymmetrical Beam

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

Problem 595
A 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.
 

595-box-beam-held-by-screws.jpg

 

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.
 

Solution to Problem 562 | Unsymmetrical Beams

Problem 562
In any beam section having a maximum stress fb, show that the force on any partial area A' in Fig. P-562 is given by F = (fb/c)A'(barred y') , where (barred y') is the centroidal coordinate of A'. Also show that the moment of this force about the NA is M' = fb I'/c, where I' is the moment of inertia of the shaded area about the NA.
 

Solution to Problem 557 | Unsymmetrical Beams

Problem 557
A cast-iron beam 10 m long and supported as shown in Fig. P-557 carries a uniformly distributed load of intensity wo (including its own weight). The allowable stresses are fbt ≤ 20 MPa and fbc ≤ 80 MPa. Determine the maximum safe value of wo if x = 1.0 m.
 

Solution to Problem 556 | Unsymmetrical Beams

Problem 556
A T beam supports the three concentrated loads shown in Fig. P-556. Prove that the NA is 3.5 in. above the bottom and that INA = 97.0 in4. Then use these values to determine the maximum value of P so that fbt ≤ 4 ksi and fbc ≤ 10 ksi.
 

Solution to Problem 555 | Unsymmetrical Beams

Problem 555
A beam carries a concentrated load W and a total uniformly distributed load of 4W as shown in Fig. P-555. What safe value of W can be applied if fbc ≤ 100 MPa and fbt ≤ 60 MPa? Can a greater load be applied if the section is inverted? Explain.
 

Solution to Problem 554 | Unsymmetrical Beams

Problem 554
Determine the maximum tensile and compressive stresses developed in the overhanging beam shown in Fig. P-554. The cross-section is an inverted T with the given properties.
 

Solution to Problem 553 | Unsymmetrical Beams

Problem 553
Determine the maximum tensile and compressive bending stresses developed in the beam as shown in Fig. P-553.
 

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