Q5/ Determine the maximum allowable load P that can be safely supported by the frame if t = 1.5 in. and b = 4 in. The wood has a normal failure stress of σfail = 5ksi and shear failure stress of Trail = 2ksi Use a factor of safety against failure of 1.5. 3 in. 3 in Q6/ If the allowable bearing stress for the material under the supports at A and B is Ob,allow = 2MPa, determine the size of square bearing plates A' and B' required to support the load. Dimension the plates to the nearest mm. The reactions at the supports are vertical. Take P = 90 kN. 40 kN/m B -1.5 m- 3 m 1.5 m