Pin-Fuse Joint

An early sketch shows components of the joint: A plate from the vertical steel member fits into a slot in the horizontal beam and is held in place by brass shims and a pin. Slip-critical bolts will give way and allow the joint to rotate in place during a massive earthquake, allowing the structure to roll with the ground without suffering irreversible damage.

Typical moment frame steel construction

Moment frame during an earthquake

Moment frame during an earthquake

Permanent plastic malformations after the shaking has stopped

Steel construction with Pin-Fuse Joint

Pin-Fuse Joint during an earthquake

Pin-Fuse Joint during an earthquake

Pin-Fuse Joint steel construction at rest after shaking stops

The Pin-Fuse Joint slips and rotates under critical seismic forces, allowing a steel structure to roll with the movement of the ground and come back to rest at the optimum point after the earthquake is over, preserving the structural integrity of the building.

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