4. Find the interaction diagram for the following columns with the same cross-sectional area and reinforcement using the specified points. Assume f = 3 ksi, fy = 60 ksi, yh=h- 5". Assume ties conform to ACI requirements and #9 bars are evenly distributed in each cross section. Assume the fiber in extreme compression in flexure is at the top of the cross sections. a. Maximum compression b. Onset of cracking &$1 = 0 c. Balanced condition Es1 = -Ey d. Transition zone Es1 = -2Ey e. Tension controlled limit &$1 = -0.00507 f. Pure Tension

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A: Using equilibrium equation and compatibility equation

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.