Where can I find information on evaluation, maintenance, and repair of existing structures?

NDS Archives + Historical Design Values

1991-1997 NDS Commentary – Historical Development

Wood Handbook – Wood as an Engineering Material

Wood and Timber Condition Assessment Manual, Second Edition – Electronic (PDF)
by Robert J. Ross and Robert H. White

Here’s contact information for the lead author:
Dr. Robert J. Ross
Email: rjross@fs.fed.us
Phone: (608) 231-9221
Website: http://www.fs.fed.us/research/people/profile.php?alias=rjross

Other resources:

Evaluation, Maintenance and Upgrading of Wood Structures: A Guide and Commentary. Published by: ASCE (Proceedings of a session at Structures Congress, 1986). Edited by: Alan Freas. Available at https://play.google.com/store/books/details?id=6lghAGA7OLwC

Evaluation and Upgrading of Wood Structures: Case Studies. Published by: ASCE (Proceedings of a session at Structures Congress, 1986). Edited by: Vijay K. A. Gopu. Available at http://cedb.asce.org/CEDBsearch/record.jsp?dockey=0050270
ISBN # 0872625508

Grading of existing timbers

West Coast Lumber Inspection Bureau (WCLIB) will grade existing timbers. Here’s contact information:

PO Box 23145
Portland, Oregon 97281-3145
Fax: 503-684-8928

Historical Considerations in Evaluating Timber Structures
R. L. Tuomi and R. C. Moody, Engineers
Forest Products Laboratory U.S. Department of Agriculture

Fire and Smoke Repair

Restoration Industry Association Guidelines for Fire & Smoke Damage Repair, 2nd Edition

Classic texts online

Rankin, William John MacQuorn (1866): Useful Rules and Tables Relating to Mensuration, Engineering, Structures, and Machines, Charles Griffn and Company, London, UK.
Includes timber design properties (see p. 199).

Johnson, J.B. (1904): The Materials of Construction – A Treatise for Engineers on the Strength of Engineering Materials, Fourth Edition, John Wiley & Sons, New York, USA.
Comprehensive strength of materials text for typical materials of the time, including timber (see p. 236-238).

Ketchum, Milo S. (1918): Structural Engineers Handbook – Data for the Design and Construction of Steel Buildings and Bridges, Second Edition, McGraw-Hill Book Company Inc., New York, USA.
Includes timber Bridges and trestles (see p. 298).

Jacoby, H.S. (1909): Structural Details or Elements of Design in Timber Framing, John Wiley & Sons, NY, USA.
An early authoritative text on timber detailing, joints, connections, design, and more.