The beam shown in cross section in fig. p7.3 is a typical interior member of a continuous building frame, with span 30 ft between support faces. at factored loads, it will carry a uniformly distributed vertical load of 3100 lb/ft, acting simultaneously with a uniformly distributed torsion of 2600 ft-lb/ft. transverse reinforcement for shear and torsion will consist of no. 4 (no. 13) stirrup-ties, as shown, with 1.5 in. clear to all concrete faces. the effective depth to flexural steel is taken equal to 22.5 in, for both negative and positive bending regions. design the transverse reinforcement for shear and torsion, and calculate the longitudinal steel to be added to the flexural requirements to provide for torsion. torsional reinforcement will be provided only in the web, not in the flanges. material strengths are = 4000 psi and f y = 60,000 psi.

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w