problem 2-4 A and B

Define the term

Define the term “limit state.” What is the difference between the ASD method and the LRFD method? What are the reasons for using resistance factors in the LRFD method? List the resistance factors for shear, bending, tension yielding, and tension fracture. Determine the factored axial load or the required axial strength, P_s of a column in an office building with a regular roof configuration. The service axial loads on the column are as follows: P_D = 200 kips (dead load) P_L = 300 kips (floor live load) P_S = 150 kips (snow load) P_W = plusminus 60 kips (wind land) P_E = plusminus 40 kips (seismic load) Calculate the required nominal axial compression strength, P_w of the column. Determine the ultimate or factored load for a roof beam subjected to the following service loads: Dead load = 29 psf (dead load) Show load = 35 psf (snow load) Roof live load = 20 psf Wind load = 25 psf upward 15 psf downward Assuming a roof beam span of 30 ft. and a tributary width of 6 ft., determine the factored moment and shear. List the floor live loads for the following occupancies: Library stack rooms, Classrooms, Heavy storage, Light manufacturing, and Offices. Determine the tributary widths and tributary areas of the joists, beams, girders, and columns in the roof framing plan shown in Figure 2-15. Assuming a roof dead load of 30 psf and an essentially flat roof with a roof slope of 1/4 in/ft. for drainage, determine the following loads using the ASCE 7 load combinations. Neglect the rain load, R, and assume the snow load, S, is zero: Uniform dead and roof live loads on the typical roof beam in pounds per foot. Concentrated dead and roof live loads on the typical roof girder in pounds per foot. Total factored axial load on the typical interior column in pounds. Roof framing plan for problem 2-6. Total factored axial load on the typical corner column in pounds. A three-story building has columns spaced at 18 ft. in both orthogonal directions, and is subjected to the roof and floor loads listed below. Using a column load summation table, calculate the cumulative axial loads on a typical interior column with and without live load reduction. Assume a roof slope of 1/4 in/ft. per foot for drainage. Roof Loads: Dead load, D_roof = 20 psf Snow load, S = 40 psf Second-and Third-Floor Loads: Dead load, D_floor = 40 psf Floor live load, L = 50 psf Determine the dead load (with and without partitions) in pounds per square foot of floor area for a steel building floor system with W24 times 55 beams spaced at 6 ft. 0 in. o.c, and W30 times 116 girders spaced at 35 ft. on centers. The floor deck is 3.5-in. normal weight concrete on 1.5 in. times 20 ga. composite steel deck. Include the weights of 1-in. light-weight floor finish, suspended acoustical tile ceiling, mechanical and electrical equipment (assume an industrial building), and partitions. Determine the dead loads in kips/ft. for a typical interior beam and a typical interior girder. Assume that the girder load is uniformly distributed. If the floor system is to be used as a heavy manufacturing plant, determine the controlling factored loads in kips/ft. for the design of the typical interior beam.Show transcribed image text