Limit State Box Culvert Design IRC:6-1966

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Standard IRC:6-1966

1.0 Design Data

1.1 Dimension Detail

No of cells

Clear Span

Clear Height (at outer edge)

Clear Height (at median location)

Width of road at top

Width of Box

Ht of fill (W.C / P.C.C / pavement layers) over the top slab

Thickness of top slab

Thickness of bottom slab

Thickness of external vertical wall

Size of haunch

Width of Crash barrier

Distance of edge of crash barrier from edge of box

Height of surcharge

Safe Bearing Capacity of the soil

Permissible Settlement

1.2 Material Properties

Density of concrete

Density of soil

Density of wearing coat

Density of Profile corrective course

Coefficient of active earth pressure

Angle of internal friction (in degree)

1.3 Design Parameters

Grade of Concrete

Clear Cover for earth face structural component

Clear Cover for inside face structural component

Clear Cover for bottom slab

Permissible direct comp. strength of Concrete (scc)

Permissible flexural comp. strength of Concrete (scb)

Permissible tensile strength of Concrete ( sct )

Permissible tensile strength of Steel ( sst )

Design Costants:

Base Projection

2.0 Load Calculations for the Box Structure

2.1 Dead Load

Self weight of the structure has been calculated directly in STAAD file by the comment "SELFWEIGHT -1".

2.2 Super Imposed Dead Load

2.2.1 Top Slab

Wearing coat thickness

Ht of fill (Thickness of W.C / P.C.C / pavement layers)

Load (UDL) on top slab = 0.065*22

Wt of Crash barrier per meter

Total UDL load due to S.I Dead Load

Height of soil on projected portion of base slab

Wt of soil on the projected portion of base slab

2.3 Earth Pressure

Thickness of top slab

Height of top haunch

Clear height between top & bottom slab

Height of bottom haunch

Thickness of bottom slab

2.4 Live Load Surcharge

Equivalent height

Uniform Intensity of loading = 0.5 * 1.2 * 20

2.5 Braking Load

Carriageway Live Load

Width of the box

Braking Load = 0.2 * 400 / 12

2.6 Additional pressure on edge 1m strip due to eccentricity of Live Load

Live Load

Width of culvert (parallel to traffic direction)

Width of culvert (perpendicular to traffic direction)

Distance of CG of load from outer edge of box culvert

Transverse Moment

Section Modulus of box in transverse direction

Upward UDL on edge 1m strip

2.2.2 Bottom Slab

Thickness of earth fill

Load (UDL) on bottom slab = 0.3 * 20

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Submitted On:

21 Dec 2017

Submitted By:

Maiwandkn91

File Date:

21 Dec 2017

File Author:

Maiwand Khan

File Version:

1.0

File Size:

1,002.00 Kb

File Type:

xls

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