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Add Collectors to Strengthen Floors/Roofs

Buildings may be damaged if floor and/or roof systems cannot transfer shear forces. Collectors, or drag struts, collect or ‘drag’ shear forces from unsupported areas of the floor or roof systems to the load-bearing walls. A collector is composed of a long wood or steel member that extends into the floor or roof framing at one end and is anchored to load-bearing walls at the other end.

Effectiveness:

  • Somewhat to very effective.

Limitations:

  • Effectiveness limited by the strength and configuration of the building. 

Strengthen Floor/Roof Systems With Steel Chords

Long masonry walls tend to crack and collapse due to bending. Damage may be reduced by securing the long walls to both the floor and roof by using either chords composed of steel straps or continuous steel angles. The straps or angles allow the walls and the floor and roof to act like a steel I-beam, increasing the strength of the floor, the roof, and the building.

Effectiveness:

  • Very effective.
  • Add tension ties and shear anchors to increase effectiveness.

 

 

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© Randolph Langenbach

M-Arch (Harvard), Dipl.Conservation (York, England)


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