1. Compute the maximum tensile normal stress Txx and the maximum shear stress Txy form the beam shown in Fig. P.11.2 at x = 3.75 m. (Include the weight of the beam, 150 N/m.)

2. To help in the prevention of cracks in loadbearing masonry walls, no tensile stress should be permitted. Shown that if a compressive load P acts along the center third (i.e., let = h/6) of the principal axes of a rectangular cross section (see Fig. P.11.16), then no tensile stresses will exist.

                                          

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