CEDS – Composite Beam with Web Openings

P355

Design to SCI P355 & Eurocode 4 • Appendix A Worked Example

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Input Data

Geometry, loads, openings

Geometry

Beam elevation & sections

Calculation Report

Full step-by-step design

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SCI P355 Appendix A Example

Default values match the worked example: 457×191×74 UKB, 10m span, rectangular openings with horizontal stiffeners

Beam Geometry

Section, span, and slab properties

Beam Span (mm)

Beam Section

Boundary Condition

Material Properties

Steel and concrete grades

Steel Grade

Concrete Grade

Composite Slab

Slab depth, deck, and spacing

Total Slab Depth (mm)

Deck Profile Height (mm)

Beam Spacing (mm)

Deck Orientation

Stud Diameter (mm)

Stud Height (mm)

Studs per Rib (n_r)

Mean Rib Width (mm)

Transverse Reinforcement (mm²/m)

Opening Details

Multiple rectangular or circular openings

Stiffener Options

Optional web stiffeners at openings

Stiffener Type

Stiffener Width (mm)

Stiffener Thickness (mm)

Dead, imposed loads and safety factors

Dead Load (excl. SW) (kN/m²)

Imposed Load (kN/m²)

Partial Factor γ_G

Partial Factor γ_Q

Click "Run Calculation" to generate the full design report. Default values match SCI P355 Appendix A worked example.

Geometry Visualization

SCI P355 style beam elevation and sections

Beam Elevation - Showing Opening Locations

Unstiffened web
Section A - A

Stiffened web
Section B - B

Opening Detail
View C - C

Show:

Calculation Summary

Overview of all 15 design checks (ULS + SLS)

Click "Run Calculation" to see results.

Beam Geometry Visualization

Full scale drawings with all dimensions

Beam Elevation - Showing Opening Location

Cross Section at Opening

Opening Detail

Section Properties

Steel Section Properties
Section	-
Depth h	-	mm
Width b	-	mm
Web thickness t_w	-	mm
Flange thickness t_f	-	mm
Root radius r	-	mm
Area A	-	cm²
Second moment I_y	-	cm⁴
Plastic modulus W_pl,y	-	cm³

Composite Section Properties
Effective width b_eff	-	mm
Concrete depth h_c	-	mm
Modular ratio n	-
NA from top y_c	-	mm
Composite I_comp	-	cm⁴
Top Tee depth h_T	-	mm
Bottom Tee depth h_B	-	mm

Overall Status

Not run

Max Utilization

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Checks will appear after calculation.

CEDS

Composite Beam with Web Openings – SCI P355

Project: — Project No: —
Element: Simply supported composite beam with openings

Code: EN 1993/1994

Ref: SCI P355

Steel: S355

Concrete: C30/37

Designed: —

Checked: —

Approved: —

Date:

Design Calculation Report

Composite beam with web openings designed per SCI P355 and EN 1994-1-1. Includes Vierendeel bending, shear, web post buckling, and shear connection checks.

P355

Ready

Enter inputs and click Run Calculation to generate a full step-by-step design report.

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Engineering note: This calculation follows SCI P355 methodology for composite beams with large web openings. Verify assumptions are appropriate for your specific design situation.