A uniform live load of Y lb/ft and a single live concentrated force of X lb are to be placed on the beam. The beam has a weight of 170 lb/ft. Assume the support at A is a pin and B is a roller. Fr B "15+A" ft 10 ft- Use: A= 8 Y= 29 X= 329 24. Determine the maximum ordinate for the influence diagram for the maximum positive shear at a point exactly between A and B. 27. Determine the maximum positive moment at a point exactly between A and B. (lb-ft) 28. Determine the maximum positive shear at a point exactly between A and B. (lb)

A beam is part of the framing system for the floor of an office building. The floor is subjected to both dead loads and live loads. The maximum moment caused by the service dead load is 45 ft-kips, and the maximum moment for the service live load is 63 ft-kips (these moments occur at the same location on the beam and can therefore be combined). a. If load and resistance factor design is used, determine the maximum factored bending moment (required moment strength). What is the controlling AISC load combination? b. What is the required nominal moment strength for a resistance factor of 0.90? c. If allowable strength design is used, determine the required moment strength. What is the controlling AISC lead combination? d. What is the required nominal moment strength for a safety factor of 1.67?

Refer to Figure P6.4. A strip load of q = 900 lb/ft2 is applied over a width B = 36 ft. Determine the increase in vertical stress at point A located z = 15 ft below the surface. Given: x = 27 ft. Figure P6.4