This document summarizes the structural analysis and design of a 7-storey commercial building in Bhaktapur, Nepal. The project members modeled the building in SAP 2000 and designed the structural components including slabs, beams, columns, staircases, basement walls, lifts, and raft foundation. The structural design followed codes IS456, IS875, IS1893, and considered seismic and gravity loads. The building has RCC framed structure with raft foundation. Structural elements were designed for strength and serviceability limits states.

1. Structural Analysis And Design of
Multi-storeyed Building
Project members:
Rajesh Dhakal (066/BCE/57)
Sandeep Shrestha (066/BCE/70)
Santanu Shrestha (066/BCE/73)
Shyam Kumar Sinkemana (066/BCE/80)
Supervisor:
Asst. Prof. Prachand Man Pradhan

2. Objectives
• Learn the concept of lateral and vertical loading
on the building.
• Identification of structural arrangement of the
plan.
• Modeling of the building for the structural
analysis.
• Detail structural analysis using SAP 2000.
• Sectional design of structural components.
• Structural detailing of members and the system.

3. Major Scope
• Seismic coefficient method is used
• Code of practices: IS456:2000,
IS875:1987(Part 1,2), IS1893:2000,
IS13920:1993, SP16,SP34
• The bearing capacity of foundation is assumed
to be 140 kN/m2.
• The project does not take into account the soil
pressure in elements at the basement as well
as the possible impact loads due to vehicles

4. Salient Features
• Name: Bharbhacho Complex
• Location: Dhudhpati, Bhaktapur
• Building Type: Commercial
• System: RCC framed Structure
• No. of storeys: 7
• Floor ht: 3.3m
• Foundation type: Raft foundation

5. Preliminary Design
• Design of Slab :
as per deflection control
Slab Depth Effective depth (d) Total depth (D)
Without secondary
beam
190 mm 220 mm
With secondary
beam
120 mm 150 mm

6. Design of beam:
as per deflection control
Beam type Width (b) Total depth (D)
Primary Beam 400 mm 550 mm
Secondary beam 250 mm 300 mm

7. • Design of column
– Loaded from slab, wall, beam and self weight of
column considered
– Factored load calculated
– 20% EQ load considered
– Equating total load with Puz=0.45fckAc+0.75fyAst
– Assuming Pt=3%
– Ag calculated and size of column adopted
Column Type Dimension (B×D) mm2
Type I 400×400
Type II 400×400
Type III 500×500

8. Manual calculation
• Dead Load
– Slab
– Beam
– Wall
– column
• Live load
• Centre of mass
• Centre of rigidity
• Eccentricity

9. SAP Analysis

10. Design of Structural members
• Design of Slab
Xm Ym Xs Ys
Ast
required
112.25 98.04 141.51 132.27
Ast
provided
452.36 376.967 376.967 376.967

11. Slab Detailing

12. Torsional Detail in Slab

13. Design of Staircase
Staircase
Main reinforcement Distribution bar Development length
Required Provided Required Provided Required Provided
Doglegged 12Φ 559c/c 12Φ 200 c/c 8 Φ@279c/c 8 Φ@270c/c 810 mm 820 mm
Openwell
1st flight
12Φ391.65
c/c
12Φ300 c/c 8 Φ@279c/c 8 Φ@270c/c 483 mm 485 mm
2nd flight 12Φ398.26
c/c
12Φ195c/c 8 Φ@279c/c 8 Φ@270c/c 600 mm 700 mm

14. Staircase Detailing

17. Design of Beam
Beam Type
Support reinforcement Mid reinforcement
Top bar Bottom bar Top bar Bottom bar
Primary beam (400x550) 5-25 Φ 4-20 Φ 2-20 Φ 2-25 Φ
Stair beam (400x 550) 2-20 Φ 2-20 Φ 2-20 Φ 4-20 Φ
Secondary beam (250x300) 3-16 Φ 2-16 Φ 2-16 Φ 3-16 Φ

18. Beam Detailing

19. Contd.

20. Design of Column
Column Types Reinforcement percent
Small (400x400) 8-28 Φ 2.43 %
Big (600x600) 12-25 Φ 1.64 %
Ramp (500x600) 12-28 Φ 2.46 %

21. Column Detailing

23. Design of Basement wall
Reinforcement pattern Face Reinforcement
Vertical Both 16 mm Φ @ 190 mm
Horizontal
Front 8 mm Φ @160 mm
Inner 8 mm Φ @320mm

24. Detailing of Basement wall

25. Design of Lift
Lift Types
Vertical Reinforcement Horizontal Reinforcement
Required Provided Required Provided
Capsule 14 Φ @ 109.36 14 Φ @ 100 12 Φ @ 253.85 12 Φ @ 250
Middle capsule 14 Φ @ 331.14 14 Φ @ 320 12 Φ @ 253.85 12 Φ @ 250
Service 14 Φ @ 367.67 14 Φ @ 350 12 Φ @ 253.85 12 Φ @ 250

26. Lift Detailing

27. Design of Foundation
Shorter span reinforcement Longer span reinforcement
20 mmφ @ 175 mm c/c 20 mmφ @ 200 mm c/c

28. Raft Footing Detailing

29. THANK YOU