Xponexus Engineering

Timber Connections Design

EN 1995-1-1 (EC5) §8 dowel-type fastener calculator. Covers nails, bolts, screws and dowels in timber-to-timber, timber-to-steel and timber-to-concrete connections. Johansen yield mode theory with rope effect.

EN 1995-1-1 §8Johansen theory Nails / Bolts / ScrewsRope effect Spacing checks

Scope note:
EC5 §8 lateral load per fastener. Check withdrawal resistance, block shear and net section separately. Verify National Annex spacing requirements.

Connection Type & Geometry

Fastener type, member thicknesses and connection configuration.

Connection

Connection configuration Connection type Fastener type No. of fasteners n No. of shear planes n_sp Load angle to grain α (°)

Member dimensions Thickness t₁ (outer member, mm) Thickness t₂ (inner member, mm) Steel plate thickness t_s (mm) Member 1 density ρ_k (kg/m³) Member 2 density ρ_k (kg/m³) k_mod γM (connections)

Fastener dimensions Diameter d (mm) Fastener f_u (MPa) – yield strength f_u for rope effect f_ax,k (MPa) Length penetration l_pen (mm) Embedment angle in member 1 (°) Embedment angle in member 2 (°)

Rope effect only applicable for nails, screws and dowels (≤ 15% of Fv,Rk).

Fastener Spacing & Edge Distances

EN 1995-1-1 §8 minimum spacing and edge/end distance requirements.

Spacing

Provided spacing a₁ – spacing parallel to grain (mm) a₂ – spacing perp. to grain (mm) a_3,t – loaded end distance (mm) a_3,c – unloaded end distance (mm) a_4,t – loaded edge distance (mm) a_4,c – unloaded edge distance (mm)

Applied force F_Ed (kN) – total joint force F_Ed type Axial component F_ax,Ed (kN) Modification note

Withdrawal (axial) f_ax,k for withdrawal (MPa) Penetration depth l_ef (mm) f_head,k (MPa) – head pull-through Washer/head diameter d_h (mm) Design notes

Check Summary

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ULS

Lateral resistance

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Withdrawal resistance

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Head pull-through

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Spacing a₁

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Spacing a₂

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End distance a₃

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Edge distance a₄

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Group effect

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Governing: — Util ≥ 1.0 = FAIL

Detailed Report

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