Kj. Fridley et al., EFFECT OF 85 YEARS OF SERVICE ON MECHANICAL-PROPERTIES OF TIMBER ROOFMEMBERS .2. CUMULATIVE DAMAGE ANALYSIS, Forest products journal, 46(6), 1996, pp. 85-90
In Part 1 of this paper, we presented the experimental evaluation of r
oof timbers removed from Peirce Hall, a turn-of-the-century structure
built on the campus of Purdue University. In this part of the paper, w
e analytically evaluate duration-of-load (DOL) effects in the Peirce H
all timbers. The analysis utilizes the five most common models for pre
dicting DOL effects, all five being based on the concept of cumulated
damage under sustained load. Part 1 of the paper reported that no DOL
effects resulted in the Peirce Hall timbers. The objective of this pap
er is to examine whether this observation could be predicted by curren
t theory.