Example 01: Spacing of Screws in Box Beam

Problem
A concentrated load P is carried at midspan by a simply supported 4-m span beam. The beam is made of 40-mm by 150-mm timber screwed together, as shown. The maximum flexural stress developed is 8.3 MPa and each screw can resist 890 N of shear force.
 

bolt-spacing-problem-01.jpg

 

  1. Determine the spacing of screws at A.
  2. Determine the spacing of screws at B.
  3. Determine the spacing of screws if screws at A and B are equally spaced.

 

Solution

 

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