Conservation Techniques in .NET

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De ection failures, cause by inadequate stiffness, usually lead to bending failures. For example, inadequate stiffness can cause excessive ponding of water on a at roof leading to failure bending. Of course, the most straightforward repair would be to put a lightweight tapered insulation on the roof and offset the de ection. Most laminated timber beams are cambered to offset dead load de ection. Excessive de ection may indicate that a large overstress is present in existing beams due to dead load only. Certainly, on more than one occasion, cambered glued laminated timber beams have been installed up-side down. Since glued laminated timber is a material that depends upon adhesives, epoxy repairs would be compatible with requirements of the Secretary of the Interior s Guidelines. Replacement-in-kind of deteriorated laminations is relatively easily accomplished in the eld if the moisture content can be controlled and if glulam stock is available. Boards can be planed to width of the member in the eld after attachment. In many glued laminated timber structures, the bases of Tudor or radial arches become deteriorated if exposed to moisture.
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FIGURE 11-5 Severe deterioration is evident in the leg of a Tudor arch, which was not protected.
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The connection of the laminated timber arch to its supporting steel shoe is critical because the shoe transfers vertical forces and horizontal thrust through anchor bolts to the foundation.
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FIGURE 11-6 In this case, axial and bending forces are transferred to a steel leg.
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Repairing this type of connection often requires that steel plates be welded to the existing shoe and connected to the glued laminated timber member to resist all forces.
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FIGURE 11-7 The steel side plates transfer axial loads and bending moment to the support.
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The connection of steel side plates to glued laminated timber may require the eld installations of 2 5 8- or 4-inch-diameter shear plates.
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FIGURE 11-8 Nine sets of holes and grooves have been installed to accept 4-inch-diameter shear plates.
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Shear plates are inserted ush to the face to the member in a dapcut by a special cutter.
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FIGURE 11-9 Providing a metal covering and blocking to allow moisture to escape will ensure the serviceability of the repair.
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Because laminated timber structures are composed of many components, sometimes the replacement in kind of a damaged or deteriorated beam, purlin, column or arch half span may be a more cost-ef cient solution that an in-place structural repair or reinforcing. Often, replacement-in-kind is not economically feasible. More advances are being made in the eld of timber design than in any other area of structural engineering. Recent products include laminated veneer lumber and numerous other beam and joist substitutes. The most important bene ts of these reconstituted wood products is the availability of long lengths, higher design values, and greater stiffness. Preservationists and preservation engineers must determine the appropriateness of these materials to each case.
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Only through specialized knowledge and experience can structural engineers make the judgments needed to properly evaluate historic timber structures. The engineer must be convinced that the structural model in the computer is an accurate representation of actual conditions. Once that is clear, the application of rigorous analysis, testing, and engineering judgment may be necessary to explain why the historic timber structure in question has performed adequately for many years.
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Tabby: Engineering Characteristics of a Vernacular Construction Material*
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abby, like historic brick masonry, receives little attention among the general public, as well as within the construction industry. At the present time, research funds for construction-related topics involving coastal issues ow toward wind design, exterior insulation systems, and the geophysical interaction of wind and ocean on shoreline development. In general, historic materials research takes a back seat to other structural engineering endeavors. A discussion of tabby as a construction material must always begin with a de nition or a description, because it is unknown to most people in the construction industry. Tabby is an early cast-in-place construction material consisting of sand, lime (from shells and wood ash), and water. Tabby can be considered a lime-based concrete, unreinforced, with shell and shell fragments serving as the coarse aggregate.
*This chapter was originally written for The Conservation and Preservation of Tabby: A Symposium on Historic Building Material in the Coastal Southeast, Jekyll Island, GA (February 1998).
Structural Investigation of Historic Buildings: A Case Study Guide to Preservation Technology for Buildings, Bridges, Towers, and Mills. David. C. Fischetti 2009 John Wiley & Sons, Inc.