Ta. Philpot et Dv. Rosowsky, THEORETICAL JOIST-RUPTURE SEQUENCES IN WOOD-FLOOR SYSTEM MODEL, Journal of structural engineering, 122(10), 1996, pp. 1225-1233
Citations number
20
Categorie Soggetti
Engineering, Civil","Construcion & Building Technology
The mechanical behavior of wood is strongly dependent on factors such
as species, grade, moisture content, and member size as well as on tim
e effects such as duration of load and creep. Time-dependent phenomena
, combined with the variability inherent in a biological material, mak
e it challenging to definitively evaluate the long-term performance of
wood structures in general through experimental testing programs. In
analytical studies of wood systems, damage accumulation and viscoelast
ic stress-strain models have been used to account for time-dependent e
ffects. Recent structural reliability studies on wood systems have use
d these types of models to include time-dependent phenomena in the ass
essment of reliability indices for various strength and serviceability
limit states. Structural reliability studies produce a notional estim
ate of the expected frequency of exceedance for a particular limit sta
te, but they do not reveal information on the process leading to that
limit-state failure. In the present study, the performance of light-fr
ame-dimension lumber wood-floor systems is investigated using a time-d
ependent Monte Carlo simulation for combined dead and occupancy live l
oads throughout a 50 year design lifetime. Particular attention is pai
d to the relative frequency and temporal characteristics of joist rupt
ures predicted by commonly accepted duration-of-load models. The resul
ts of the study provide insight into probable long-term wood-system be
havior and can help to further the development of appropriate design,
inspection, and maintenance procedures.