Time-Dependent Load-Distribution Behavior of Parallel-Member Wood Systems

by P. Hong, Univ of Oklahoma, Norman, United States,
K. J. Fridley, (A.M.ASCE), Univ of Oklahoma, Norman, United States,
D. V. Rosowsky, (A.M.ASCE), Univ of Oklahoma, Norman, United States,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

The effect of differential member creep on the load-distribution behavior of parallel-member wood systems is examined. Variability in the creep response of the individual component members of a system contribute to load redistribution over time. A simple, parallel-member system model is used to illustrate such behavior. An existing viscoelastic constitutive model calibrated for structural grade lumber is used to represent the creep response of the component members. Significant time-dependent load redistribution is observed with the system model. For example, a sample six-member system examined in this study and subjected to a one-year constant load exhibited load redistribution (i.e., maximum percentage change in the load carried per member over time) of approximately ± 20% owing to differential member creep.



Subject Headings: Maximum loads | Time dependence | Load distribution | Material properties | Wood | Wood structures | Load factors | Wood construction

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