Answer to Question #330068 in Civil and Environmental Engineering for James

Question

A timber beam having a simple span of 4m carries a total load including its own weight of 15kN/m. It

has a trapezoidal section having width of 250 mm at the top and 200 mm at the bottom and a depth of 360 mm, dressed dimension is used by reducing its dimensions by 15 mm. The wooden section is made up of 80% grade Apitong with the properties as follows:

fb = 16.5 MPa

fv = 1.75 MPa

Compute the following:

a. Maximum flexural stress

b. Maximum shear stress