Code of Practice For Design Loads (Other Than Earthquake)For Buildings And Structures, Part 1: Dead Loads - Unit Weights of Building Material And Stored Materials (Incorporating IS 1911: 1967)
1987 Edition

Overview of IS 875 Part 1 (1987)

• Purpose: Defines unit weights of building materials and components for dead load computations.
• Materials Included: Concrete, steel, bricks, timber, pipes, insulation, and more.
• Unit Weight Tables: Provide values in kN/m³ or kN/m essential for load calculations.

Dead Load Calculation Formula

[ \text{Dead Load} = \text{Unit Weight} \times \text{Volume or Area} ]

Sample Steel Beam Weights

flowchart TD
    A[IS 875 Part 1] --> B[Material Unit Weights]
    B --> C[Building Materials]
    B --> D[Building Components]
    C --> E[Concrete, Steel, Bricks, Timber, Pipes]
    D --> F[Roofing, Flooring, Walls]
    E --> G[Dead Load Analysis]

Scope Summary of IS 875 Part 1 (1987)

• Coverage: Prescribes unit weights of construction materials and components for structural dead loads.
• Materials Covered: Steel sections (beams, columns, channels, angles), concrete, bricks, pipes, sheeting, soils, aggregates, and others.
• Usage: Applied for dead load calculations in structural design.

Sample Unit Weights for Steel Sections

Unit Weights of Common Materials

Calculation Formula

[ \text{Dead Load} = \text{Unit Weight} \times \text{Volume} ]

Where volume is cross-sectional area times length.

Key Data on Building Materials from IS 875 Part 1 (1987)

Unit Weights of Common Materials

Notes:

• Weights represent vertical loads; roof loads should be adjusted by cosine of roof slope angle.
• Refer IS 6072 for autoclaved cellular concrete slabs.

Load per Unit Area Calculation

[ \text{Load} = \text{Thickness (m)} \times \text{Unit Weight (kN/m}^3) ]

Overview of Stored Materials from IS 875 Part 1

Appendix A: Unit Weights and Internal Friction Angles for Stored Materials

Important Application Notes

• Unit weights and friction angles are vital for load and lateral pressure assessments in storage design.

IS 875 Part 1: Unit Weights for Stored and Miscellaneous Materials

1. Unit Weight Data for Dead Load Estimation

• Appendix A details unit weights for various stored and miscellaneous materials.
• Values are expressed as kN/m² or kg/m² depending on material thickness.

2. Representative Unit Weights

3. Notes:

• Roof loads normal to slope equal vertical loads multiplied by cosine of roof pitch.
• Consult IS 6072 for autoclaved cellular concrete slabs.

Conversion Formula:

[ W_{normal} = W_{vertical} \times \cos(\theta) ]

Where ( W_{normal} ) is load perpendicular to roof surface, ( W_{vertical} ) is vertical load, and ( \theta ) is roof slope angle.

This data is fundamental for precise dead load assessments in structural applications.

Summary of Metals and Alloys Unit Weights as per IS 875 Part 1

• Sheet weights examples:
  • Aluminium: approximately 0.028 kN/m² per mm thickness
  • Copper: approximately 0.09 kN/m² per mm thickness

Calculation Formula for Metal Sheet Weight

[ \text{Weight} = \text{Thickness (mm)} \times \text{Unit Weight per mm (kN/m}^2) ]

Used extensively for dead load calculations in design.

IS 875 Part 1 (1987) specifies unit weights and friction angles for textiles, paper products, and related materials as detailed in Clause 8 and Table 4:

Notes

• Generally, friction angles are unspecified for these materials.
• Values assist in load calculations and storage design considerations.

flowchart TD
    A[Textiles & Paper] --> B[Unit Weights]
    A --> C[Weight in kg/m³]
    A --> D[Friction Angle]
    B --> E[Load Determination]
    C --> E
    D --> E
    E --> F[Structural & Storage Design]

Fuel Materials Unit Weights and Friction Angles per IS 875 Part 1

Notes:

• Accurate weights and friction angles are critical for safe storage structure design.
• Values vary with moisture and packing conditions.

flowchart TD
    A[Fuels] --> B[Unit Weight]
    A --> C[Friction Angle]
    B --> D[Load Calculations]
    C --> D
    D --> E[Structural Design]

Content details for manures are not currently available in this summary.

IS 875 Part 1 (1987): Relevant Data for Pipes, Gutters, and Sheeting

1. Pipes Unit Weights (Excerpt from Clause 15.70, Table 1)

2. Sheeting and Gutters

• Galvanized Iron Sheet typically weighs around 0.15 kN/m² (15 kg/m²).
• Asbestos Cement Sheeting weights as per relevant IS standards.
• Terrazzo paving weight approximately 0.24 kN/m² (24 kg/m²).
• Various tile types (e.g., Mangalore, Allahabad, Country) weigh between 2 to 3 kg per tile depending on type.

3. Notes

• All weights expressed as unit weights (kN/m or kN/m²) for load calculations.
• Pipe lengths generally considered as 1.5m or 1.8m including socket.
• Roof load normal to slope calculated by multiplying vertical load with cosine of roof angle.

Load Normal to Roof Formula

[ W_n = W_v \times \cos(\theta) ]

Where:

• (W_n) = load perpendicular to roof surface
• (W_v) = vertical load
• (\theta) = roof pitch angle

Refer to IS 1626 and other relevant standards for detailed material specifications.

Unit Weight Tables in IS 875 Part 1

1. Table 1: Unit Weights of Individual Building Materials

• Contains unit weights (mass per volume) of materials such as concrete, bricks, steel, timber.
• Values expressed in kN/m³ or kg/m³.
• Utilized for calculating dead loads in structural elements.

2. Table 2: Unit Weights of Building Components and Assemblies

• Lists typical weights for assemblies like walls, roofs, floors including finishes.
• Facilitates composite load estimation.

3. Appendix A: Unit Weights and Angles of Internal Friction for Stored Materials

• Includes weights and friction angles for materials like grains, coal, chemicals.
• Important for assessing live load and lateral pressures.

Sample Unit Weights

Load Calculation Formula

[ \text{Dead Load} = \text{Unit Weight} \times \text{Volume} ]

flowchart LR
    A[Material Type] --> B[Unit Weight from Table 1]
    B --> C[Dead Load Computation]
    A --> D[Building Component]
    D --> E[Unit Weight from Table 2]
    E --> C
    F[Stored Material] --> G[Unit Weight & Friction Angle from Appendix A]

IS 875 Part 1: Internal Friction Angles for Stored Materials

• The angle of internal friction ((\phi)) is a critical parameter for designing structures storing bulk materials.
• It influences lateral earth pressures exerted on retaining walls or storage bins.
• Typical friction angles range from 20° to 45°, depending on material type.
• Unit weights ((\gamma)) are provided alongside friction angles for load and pressure calculations.

Sample Friction Angles and Unit Weights

Application

• Friction angle values are used in earth pressure theories (Rankine, Coulomb) to calculate lateral pressures:

[ K_a = \tan^2 \left(45^\circ - \frac{\phi}{2} \right) ]

Where (K_a) is the active earth pressure coefficient.

• Lateral pressure on a wall at depth (h):

[ P = K_a \times \gamma \times h ]

• These calculations ensure safe and economical design of storage structures.

flowchart TD
    A[Select Material] --> B[Find Friction Angle \(\phi\)]
    B --> C[Calculate \(K_a\)]
    C --> D[Obtain Unit Weight \(\gamma\)]
    D --> E[Compute Lateral Pressure \(P\)]
    E --> F[Design Storage Structure]

Content not currently provided.

IS 875 Part 1 (1987) focuses on dead load specifications, detailing unit weights for a variety of materials and components used in construction.

Highlights:

• Unit weights cover soils, gravels, steel, stone, coal, insulation, tiles, timber, water, and more.
• Building parts like ceilings, flooring, roofing, walling are tabulated with unit weights.
• Stored and miscellaneous materials including agricultural products, chemicals, metals, textiles, and paper are included.

Notes:

• No explicit formulas for Right to Information or copyright are included.
• The document supports transparency by openly publishing unit weight data.

Dead Load Calculation

[ \text{Dead Load} = \text{Unit Weight} \times \text{Volume} ]

Sample Unit Weights

flowchart LR
    A[IS 875 Part 1] --> B[Material Unit Weights]
    A --> C[Building Component Weights]
    A --> D[Miscellaneous Material Weights]
    B --> E[Dead Load Computations]
    C --> E
    D --> E

Summary of Amendments to IS 875 Part 1 (1987)

• Amendment 1 (December 1997) updated unit weights for building and stored materials.
• Values are rounded in accordance with IS 2:1960 for numerical consistency.
• Earthquake load provisions updated in IS 1893 third revision impact load considerations.
• The schedule of unit weights includes materials like concrete, steel, brickwork, soil, and water.

Sample Unit Weights After Amendment

Rounding Rules

• Values are rounded to 3 significant figures or as per IS 2:1960 specifications.
• Ensures uniformity in design computations.

flowchart LR
    A[IS 875 Part 1] --> B[Unit Weights Table]
    B --> C[Material Properties]
    A --> D[Amendment 1997]
    D --> E[Updated Unit Weights]
    A --> F[Rounding per IS 2:1960]