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Multi-storey commercial building design details step by step
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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
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.
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
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
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
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
• 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 adoptedColumn Type Dimension (B×D) mm2
Type I 400×400Type II 400×400Type III 500×500
Manual calculation
• Dead Load– Slab– Beam– Wall– column
• Live load• Centre of mass• Centre of rigidity• Eccentricity
SAP Analysis
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
Slab Detailing
Torsional Detail in Slab
Design of Staircase
StaircaseMain 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
Openwell1st flight
12Φ391.65c/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
Staircase Detailing
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
Beam Detailing
Contd.
Design of ColumnColumn Types Reinforcement percent
Small (400x400) 8-28 Φ 2.43 %
Big (600x600) 12-25 Φ 1.64 %
Ramp (500x600) 12-28 Φ 2.46 %
Column Detailing
Design of Basement wall
Reinforcement pattern Face ReinforcementVertical Both 16 mm Φ @ 190 mm
HorizontalFront 8 mm Φ @160 mmInner 8 mm Φ @320mm
Detailing of Basement wall
Design of Lift
Lift TypesVertical 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
Lift Detailing
Design of FoundationShorter span reinforcement Longer span reinforcement
20 mmφ @ 175 mm c/c 20 mmφ @ 200 mm c/c
Raft Footing Detailing
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