JointIO Multipurpose Huth Joint Modeler

Joint Layout

Preset (fills spans — all modes use the same general solver)

Set each sheet’s start/end (or multi-interval spans). At every fastener, Huth springs couple every co-present pair — including non-adjacent sheets (S1/S2/S3 style).

Huth / Shear

Fastener Row

Count

Equal spacing

Pitch (in)

Fixed→F_n

F₁→Load

Uniform fastener d / Ef

d (in)

Ef (ksi)

Row length L = 11 in · F1 = right (load) end

Sheets

x₀ / x₁ in inches (blank end = full L). Multi-interval: use a-b;c-d in the spans field for discontinuous sheets.

#	Name	t	E	w	x₀	x₁	Spans	Fix	Load

P_ref (right end)

Check Load per sheet to share P_ref at that sheet’s rightmost end. Check Fix to pin u = 0 at the left when the sheet is present there.

Joint Preview

Configure sheet spans and fasteners, then press SOLVE.

Summary

Element Loads

Max Interface Shear

Sheet Bypass

Fastener Elements

ID	x	d	Ef	√ΣF²	Max iface	Pair shears (all co-present)

Sheet Segments

ID	Sheet	Spans	x₀	x₁	Bypass

Technical Reference

JointIO — Multipurpose Huth Model

1D spring-bar model • Units: in, ksi, lb • F1 = right (load) end

JointIO is a single general-purpose joint modeler. Each sheet is defined by material properties, optional left-end fix, optional share of P_ref, and one or more axial spans along the fastener row. Stack, lap, and butt geometries are presets that fill those spans — not separate solvers.

All-pair Huth springs

At every fastener station, Huth shear stiffness (1984 Eq. 31) couples every pair of sheets that are both present — adjacent black bars and non-adjacent springs (S1/S2/S3 in the Example Joint figure). Discontinuous sheets use multi-interval spans so a gap is never bridged by an axial bar.

Presets

General / Example Joint — full control of spans; Example Joint loads a 4-sheet multi-span case with non-adjacent pairs.
Stack / Lap / Butt — convenience presets that write start/end (and roles for legacy API compatibility).

Constraints & loads

Fix pins the sheet at the left end when present there. Load applies a share of P_ref at the sheet’s rightmost present node.

Outputs

Fastener resultant and max interface shear (with all pair shears); sheet bypass per segment; equilibrium residual. Preview: N = axial, B = bearing, G# = bypass.

Linear elastic parallel_all_pairs idealization. No hole deformation, friction, or fastener plasticity.