Estimate the size of the column cross-section (preliminary design) using the data given below. The column size will be the same throughout the height of the building. Consider the loads at the foundation level when determining the column size. The materials to be used are C25 and S420.

(a) Tributary area = 36 m² (same for all floors)
- Five-story building, n = 5
- Adequate structural walls are to be provided in both directions, making this a braced frame, located in Seismic Zone-3.
- Design a square cross-section.

(b) Tributary area = 20 m² (same for all floors)
- Six-story building, n = 6

Determine the appropriate column cross-section size for both scenarios.

(a) For the five-story building with a tributary area of 36 m², we can design a square cross-section column. To determine the size, we consider the maximum load that the column needs to support. Since the building is located in Seismic Zone-3, we need to account for seismic forces.

Using the given materials C25 and S420, we can calculate the required dimensions of the column cross-section by analyzing the maximum axial load and moment at the base. This involves performing structural calculations using appropriate design codes and guidelines specific to the chosen materials and the seismic zone.

(b) For the six-story building with a tributary area of 20 m², a similar approach can be followed to design a square cross-section column. The design process involves considering the maximum load and moment at the base to determine the required dimensions of the column.

It is important to note that the actual design of the column cross-section requires detailed analysis and considerations beyond the given information. Professional structural engineers and design codes should be consulted to ensure the accurate and safe design of the column for the specific building requirements.

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