Answer :
Final answer:
This engineering question involves designing and analyzing a reinforced slab using the direct design method. It involves a step-by-step process, calculating slab size and loads, performing frame analysis, and designing interior and exterior slab panels in both E-W and N-S directions.
Explanation:
The direct design method is a technique used to design the interior and exterior panels of a flat slab. Understanding its principles is essential to carry out a complete analysis in the East-West and North-South directions. This method causes the slab to rely on the rigidity of its supports to distribute the load in each direction equally.
The slab needs to be designed to support a live load of 144 psf. Given that all columns are 14" square, the f' value is 4000 psi and fy value is 60000 psi, the calculations for slab size and loads can be taken forward. The slab size can be calculated once the stress in the slab is understood, and the loads can be gathered from dead load, live load, wind load and seismic load if applicable.
We then need to perform the frame analysis for both E-W and N-S directions, considering both interior and exterior frames. After the frames' behaviour under loads are analysed and understood, the next step is to design the interior and exterior slab panels in both directions (N-S & E-W) with detailed specifics of reinforcing bar size, cover and spacings.
The objective of this study is to enhance students' in-depth knowledge on the direct design method and its application in the design of reinforced slabs, therefore handling the design in a step by step manner is crucial.
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