Abstract: In a double layer grid-type of spare frame, certain straight framing members are connected at their opposite ends to separate node connectors carried by chords of the frame. The node connectors have elements which define a pair of spaced, parallel, substantially flat opposing surfaces. The framing members have substantially flat parallel opposing exterior surfaces at their ends which are disposed between the flat opposing surfaces of the node connectors. A shear pin passage is formed through each framing member and on a line normal to the end's parallel exterior surfaces. Holes for a shear pin are formed through the node connector elements on a line normal to the elements' opposing surfaces. A shear pin is engaged in the element holes and the framing member pin passage to define a pinned connection of the framing member to the node connector.