Using the tributary area method, compute the floor dead loads supported by columns A1 and B2 in Figure 1.2. The floor system consists of a 6-in.-thick reinforced concrete slab weighing 75 lb/ft2. Allow 15 lb/ft2 for the weight of floor beams, utilities, and a ceiling suspended from the floor. The precast exterior wall supported by the perimeter beams weighs 600 lb/ft. 18' 18′ -20° 10' 10' panel ∙I panel Figure 1.2 panel panel panel

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Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.