Xponexus Engineering

Floor Joist Design

EN 1995-1-1 (EC5) solid timber & engineered floor joist calculator. Bending, shear, bearing, deflection (instantaneous + long-term), vibration serviceability and notch effects.

EN 1995-1-1C16 / C24 / C27 Vibration §7.3Notch effects

Scope note:
EC5 §6 & §7 checks. Verify floor construction, strutting, restraint and fire resistance separately.

Joist Section & Material

Timber species/grade and cross-section dimensions.

Section

Timber grade (C-class) Grade f_m,k (MPa) f_v,k (MPa) f_c,90,k (MPa) f_t,0,k (MPa) E_0,mean (MPa) E_0,05 (MPa) ρ_mean (kg/m³)

Cross section & span Joist width b (mm) Joist depth h (mm) Joist spacing s (mm) Span L (m) No. of joists in group n Engineered joist type

Modification & service Service class Load duration class k_mod (0=auto) γM k_def k_h (size factor, 0=auto) System factor k_sys

Loads

Floor loads – ULS and SLS per joist.

Loads

ULS loads (per joist) Permanent g_k (kN/m²) Variable q_k (kN/m²) γG γQ Self-weight include? Point load P_k (kN, midspan)

Bearing & notch Bearing length l_b (mm) Notch at support? Notch depth h_n (mm) Notch length x (mm from support) Notch inclination α (°)

Deflection & vibration Deflection limit w_inst L/ Net final limit L/ ψ2 (quasi-perm) Vibration criterion Unit impulse limit w (mm/kN) Design notes

Check Summary

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ULS + SLS

Bending (ULS)

—

Shear (ULS)

—

Notch shear

—

Bearing

—

Deflection

—

Vibration

—

Governing: — Util ≥ 1.0 = FAIL

Detailed Report

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