Directions: The proposed building is a two-story commercial office building. At this stage as an engineer, you should design a one-way slab as a part of floor system at roof for just one span, according the information provided in the following: Design Criteria: - - - - - - Roof area is 60'x80'. In 60' direction, there are 4 columns, which have divided the width of the roof to 3 equal spans. In 80' direction, there is just one span (No column in between). Concrete construction is normal weight concrete with f'c = 4000 psi. Reinforcing steel is new and conforming to ASTM A615 grade 60 (fy=60,000 psi). Assume that each span is separate from others, and simply supported. Design moment for each T-beam is obtained using the design distributed load (wu) for each t-beam span (S=9.875 ft) Figure (3) You can ignore the width of columns, in order to find the L of span. Roof Loads: 310 lb/ft² dead load, 250 lb/ft² service live load. Include weight of the slab as a dead load in design for moment. Submission: Each student is required to complete and submit the following: - - - - - Design the flexural reinforcing for a T-beam according to ACI code provisions (e.g. reinforcing bars arrangement). Estimate construction quantities: a) the volume of concrete and b) the total weight of steel reinforcement for the entire roof. Estimate the cost assuming that concrete is $120/cubic yard and reinforcing steel is $3/pound. The prices include materials and labor needed to complete the work. Do the same cost calculations for Slab design that you did in Assignment #2 and in the conclusion part discuss which design you prefer. Report: Write a report according the given template. The report is to be typed on 8.5" x 11" white computer paper unless otherwise noted. Calculations: are to be done by hand on 8.5" x 11" engineering paper. Design Drawing: Draw your final sketch using AutoCad. It should contain all of the details. Ground 1'-0" Below Top of Wall Ret. Wall 20 ft 20% 5"' Roof Girder "GI" Roof T-Beams "TB-1" 2-Way 2nd Floor Slab Ext. Wall &. Well tq. /F1° Figure 1. View of the building 15" S=9.875ft 80 ft Figure 2. Floor of the roof for on span. Span of Beam Corner Column "C1" + Footing "F1" Figure 3. The load area that each T-beam can carry on.