Case Studies in Upgrading of Wood Trusses and a Heavy Timber Buildingby Franz N. Rad, Portland State Univ, Portland, OR, USA,
Wade W. Younie, Portland State Univ, Portland, OR, USA,
Raymond T. Miller, Portland State Univ, Portland, OR, USA,
Abstract: Three case studies in upgrading and rehabilitation of wood structures are presented. One case study relates to three 30m (100ft) span bowstring trusses that had to be cut at various span locations to allow for a new light-rail project right-of-way. New wall and pilaster supports were installed. A second case study involved upgrading a 12 multiplied by 30m (40 multiplied by 100ft), 3-story heavy timber building that was originally built as the lower tram house of the Mt. Hood Aerial Tramway. The roof was reframed in the late 1950's. This framing was inadequate. Major upgrading work done during the renovation included adding several glulam beams to support the overloaded floor. The third case study deals with the repair of a 76-year old lattice bowstring roof truss system. The seven 20m (66ft) long trusses, constructed with 'one by' boards amd nails, were in a state of progressive failure. Trusses were relieved of most of the design load by adding glued-laminated beams and a mid-span column.
Subject Headings: Case studies | Trusses | Wood structures | Light rail transit | Wood | Roofs | Laminated materials | Beams
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