Project 2_Design & Analysis of a Hostel building at Guwahati, Assam

This is a comprehensive structural design challenge, guiding participants through modeling, analysis, design, and construction documentation of a G+3 RCC hostel building located in Guwahati, Assam (Seismic Zone V). Below is a structured breakdown to help you complete the entire workflow using ETABS, SAFE, and AutoCAD, with all the relevant IS codes incorporated.

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📋 PROJECT OVERVIEW

Attribute	Value
Location	Guwahati, Assam (Seismic Zone V)
Building Use	Hostel Block (Institutional)
Building Configuration	G+3 floors
Ground Floor Height	2.0 m above site level (due to flooding)
Soil Type	Type 3 (per IS 1893)
Foundation	Piles (500 mm dia, 10 m length, 280 kN capacity)
Wall Type	AAC blocks
Materials	M25 Concrete, Fe500 (long.), Fe415 (shear)
Expansion Gap	Two blocks separated by gap
Seismic Design Codes	Yes (IS 1893, IS 13920)

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🧱 STAGE 1: ARCHITECTURAL STUDY & LOAD ASSESSMENT

🔍 From the architectural drawings:

• Identify room uses for live load from IS 875 Part 2

• Identify wall thickness & estimate dead load using density of AAC blocks (~7–8 kN/m³)

• Estimate floor finish load (typically ~1–1.5 kN/m²)

• Add parapet loads on roof level

• Add water tank load (if present)

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🧰 STAGE 2: ETABS MODELING (2 BLOCKS)

⚙️ Create Two ETABS Models:

• Model both blocks on either side of the expansion joint

• Each model contains:

  • Story data: G+3 with 2.0 m plinth

  • Beam/column framing as per architectural drawing

  • Slabs (150 mm typical)

  • Apply DL, LL, and Earthquake loads (Zone V, soil type III, importance factor = 1.0)

📌 Load Combinations:

Use IS 456 and IS 1893-compliant combinations, e.g.:

• 1.5(DL + LL), 1.2(DL + LL ± EQ), 1.5(DL ± EQ), etc.

🧯 Seismic Considerations:

• Use Response Spectrum Method (Zone V, soil type III)

• Model AAC walls as equivalent diagonal struts or include DL only

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📐 STAGE 3: DESIGN & DETAILING IN ETABS

✅ Check and Extract:

• Column axial loads and bending moments

• Beam moment and shear diagrams

• Story drifts (limit as per IS 1893: < 0.004h)

• Vertical and plan irregularities

📄 Deliverables from ETABS:

• Framing Plan (Typical Floor)

• Column Reinforcement

• Ground Floor Beam Reinforcement

• Export reinforcement for selected elements

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🧱 STAGE 4: FOUNDATION DESIGN IN SAFE

Pile Foundation:

• Each pile = 280 kN capacity

• Based on axial column load (from ETABS), determine number of piles per column

Pile Cap:

• Model pile cap in SAFE for each foundation group

• Typical pile caps (3-pile triangular, 4-pile square, 6-pile rectangular)

• Use M25 concrete

• Fixed pile supports or use spring constants from IS 2911

Outputs from SAFE:

• Pile Cap Depth

• Top/Bottom Reinforcement

• Punching and Bending Check

• Export layout with pile locations

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🔗 STAGE 5: TIE BEAMS BETWEEN PILE CAPS

• Required to tie foundations together to prevent differential settlement and improve seismic performance

• Typically 230 × 450 mm beams (to be finalized via load analysis)

• Reinforced to carry bending + axial from seismic loading

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📝 STAGE 6: CONSTRUCTION DRAWINGS (AutoCAD or Hand Sketches)

Minimum Drawings Required:

1. Framing Plan (Typical Floor)

   • Grid lines, beams, columns

2. Column Reinforcement Details

   • Longitudinal + ties + lap location (per IS 13920)

3. Ground Floor Beam Details

   • Cross-section, flexural and shear reinforcement, curtailment

4. Pile Cap Details

   • Plan and section with pile positions and bar layout

5. Tie Beam Details

   • Plan view and elevation with bar dia, spacing, lap length

6. Foundation Layout Plan

   • Showing column locations, pile group, tie beam layout

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📘 REFERENCES TO USE:

• IS 875 Part 1 & 2 – Dead and Live Loads

• IS 456 – General RCC Design

• IS 13920 – Ductile Detailing

• IS 1893 (Part 1) – Seismic Loads

• IS 2911 (Part 2) – Pile Foundation

• SP 34 – Detailing Guidelines

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✅ FINAL SUBMISSION CHECKLIST

Item	Required
ETABS models for both blocks	✅
SAFE model for pile caps	✅
Framing plan (typical)	✅
Column reinforcements	✅
Ground floor beam reinforcements	✅
Pile cap details	✅
Tie beam details	✅
Foundation layout	✅

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