Project 2

Design Basis Report:

1. Introduction: The project involves the design of a warehouse building in Chennai, India, with the following specifications:

• Width: 30m
• Length: 50m
• Eave Height: 9m
• Bay Spacing: 6m
• Soil Type: Medium
• Safe Bearing Capacity: 200 kN/m2
• Roof Slope: 1 in 12

2. Loadings: The building will be subjected to the following loadings:

• Dead Load (DL): 0.15 kN/m2 (roofing and cladding), 0.20 kN/m2 (purlins), 0.25 kN/m2 (steel framing)
• Live Load (LL): 1.5 kN/m2 (storage), 2.0 kN/m2 (maintenance)
• Wind Load (WL): 0.52 kN/m2 (design wind speed of 50 m/s)
• Earthquake Load (EQL): Zone III as per IS 1893 with Response Reduction Factor (R) = 5

3. Design Codes: The design of the warehouse building will be based on the following Indian Standards:

• IS 800:2007 - General Construction in Steel
• IS 875 - Part 1: Dead loads, Part 2: Live loads, Part 3: Wind loads, and Part 5: Earthquake loads
• IS 1893 - Criteria for Earthquake Resistant Design of Structures

4. Structural Model: The structural model of the warehouse building will be created using STAAD Pro Connect Edition. Suitable sections for the structural elements will be assumed based on the design codes mentioned above.

5. Design of Steel Columns: The steel columns will be designed as per the following steps:

• Determine the design axial load on the column based on the combination of DL, LL, and EQL loads.
• Determine the effective length factor (K) of the column based on the boundary conditions.
• Determine the slenderness ratio (λ) of the column.
• Determine the design moment on the column based on the combination of WL and EQL loads.
• Check the adequacy of the section using the design moment and axial load.

6. Design of Roof Rafters: The roof rafters will be designed as per the following steps:

• Determine the design moment on the rafter based on the combination of DL, LL, and EQL loads.
• Determine the effective length factor (K) of the rafter based on the boundary conditions.
• Determine the slenderness ratio (λ) of the rafter.
• Check the adequacy of the section using the design moment.

7. Design of Base Plates: The base plates will be designed as per the following steps:

• Determine the design axial load on the column based on the combination of DL, LL, and EQL loads.
• Determine the maximum bending moment on the base plate based on the design axial load.
• Check the adequacy of the base plate thickness and area using the maximum bending moment.

8. Design of Pedestals: The pedestals will be designed as per the following steps:

• Determine the design axial load on the pedestal based on the combination of DL, LL, and EQL loads.
• Determine the maximum bending moment on the pedestal based on the design axial load.
• Check the adequacy of the pedestal thickness and area using the maximum bending moment.

9. Design of Z-Purlins: The Z-purlins

2

Design Report:

1. Introduction: The project involves the design of a simply supported gantry girder to carry an electric overhead traveling crane. The following specifications are given:

• Span of gantry girder: 7m
• Span of crane girder: 9m
• Crane capacity: 250 kN
• Self-weight of trolley, hook, electric motor, etc.: 40 kN
• Self-weight of crane girder excluding trolley: 100 kN
• Minimum hook approach: 1.0m
• Distance between wheels: 3m
• Self-weight of rails: 0.2 kN/m

2. Loadings: The gantry girder will be subjected to the following loadings:

• Dead Load (DL): Self-weight of gantry girder and rails.
• Live Load (LL): Crane capacity, self-weight of trolley, hook, electric motor, etc.

3. Design Codes: The design of the gantry girder will be based on the following Indian Standards:

• IS 800:2007 - General Construction in Steel

4. Structural Model: The structural model of the gantry girder will be created using suitable software, such as STAAD Pro or ProtaStructure.

5. Design of Gantry Girder: The gantry girder will be designed as per the following steps:

• Determine the maximum bending moment and shear force at the critical sections of the girder due to DL and LL loads.
• Select a suitable section based on the maximum bending moment and shear force.
• Check the deflection of the girder under DL and LL loads.
• Check the adequacy of the web and flange thickness of the selected section.
• Check the web bearing stress at the supports.
• Check the adequacy of the end connections of the girder with the supports.

6. Design of Crane Girder: The crane girder will be designed as per the following steps:

• Determine the maximum bending moment and shear force at the critical sections of the girder due to DL and LL loads.
• Select a suitable section based on the maximum bending moment and shear force.
• Check the deflection of the girder under DL and LL loads.
• Check the adequacy of the web and flange thickness of the selected section.
• Check the web bearing stress at the supports.
• Check the adequacy of the end connections of the girder with the supports and trolley.

7. Design of End Supports: The end supports will be designed as per the following steps:

• Determine the reactions at the supports due to DL and LL loads.
• Check the adequacy of the bearing pressure on the supports based on the reactions.
• Design the base plates and anchor bolts for the supports.

8. Design of Rails: The rails will be designed as per the following steps:

• Determine the reactions at the supports due to DL and LL loads.
• Check the adequacy of the bearing pressure on the supports based on the reactions.
• Select a suitable rail section based on the maximum bending moment and shear force.
• Check the adequacy of the rail section for the selected loads.

9. Design of Connections: The connections between the gantry girder, crane girder, and supports will be designed as per the following steps:

• Determine the maximum forces and moments at the connections due to DL and LL loads.
• Select a suitable connection type based on the maximum forces and moments.
• Check the adequacy of the selected connection type for the selected loads.