Deflection Check (SLS) — Multi‑Code

Serviceability deflection calculator for RC and Steel members. Includes cracked-stiffness options, creep (φ), construction stage (after finishes/partitions), and code-limit comparison.

Import

Inputs

Ready

Project & Member

Project name Member type

Span, L (m) Support condition Load case

Point load location

Loads & Construction Stage

Dead load DL (kN/m or kN) Superimposed dead SDL (kN/m or kN) Live load LL (kN/m or kN)

Sustained fraction of LL, ψ (0–1) Creep coefficient, φ Nonstructural elements installed at

Stage logic: The tool can estimate “deflection occurring after finishes/partitions” by treating loads applied before the attachment stage as contributing only their time‑dependent (creep) portion after attachment, while loads applied after contribute their full immediate + creep (if sustained).

RC Section & Materials

Width b (mm) Overall depth h (mm) Cover (mm)

Main bar dia (mm) Tension steel As (mm²) Compression steel As′ (mm²) (optional)

fck (MPa) Es (MPa) Analysis basis (Ec, ft / cracking model)

Ec (MPa) ft / fr (MPa)

Cracking / stiffness model Concrete unit weight (kN/m³) Auto self‑weight

Steel I‑Section (dims → I)

Depth D (mm) Flange width bf (mm) Flange thickness tf (mm)

Web thickness tw (mm) E (MPa)

Steel (input I)

I (mm⁴) E (MPa)

Custom E & I

E (MPa) I (mm⁴)

Code Limits (compare)

Selected code presets

IS 456:2000 (RC) NBC 110 (Nepal RC) Eurocode 2 (EC2) ACI (318-style) IS 800:2007 (Steel)

ACI category (simplified) Steel category (simplified)

Defaults are provided as practical presets. Always verify against your governing code/project spec.

Results

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Immediate deflection (total)

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Final deflection (incl creep)

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After finishes/partitions

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Member stiffness summary

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Code checks

Code	Check	Computed (mm)	Allowable (mm)	Utilization	Status
Run Compute…

Notes / Assumptions

Linear-elastic deflection formulas for common cases (UDL/Point; SS/FF/Cantilever).
RC: cracked stiffness uses transformed section (rectangular) + selectable interpolation model.
Creep handled with φ on sustained load portion (transparent method).

This tool supports engineering judgement, not a replacement for detailed design/peer review.