RELIABILITY-BASED SYSTEM FACTOR FOR SERVICEABILITY DESIGN OF WOOD FLOORS

A structural analysis model for parallel-member wood joist floors is d eveloped that includes the effect of component creep. Viscoelastic mat erial models are calibrated using the data from a recently completed e xperimental program conducted as part of this overall study. Using thi s system model, deflection serviceability reliability analyses of para llel-member wood systems, including the effects of creep deformation, are conducted. Stochastic load models are used to simulate the time-va rying nature of applied loads. Multiple limit state definitions for de flection serviceability of parallel-member wood floors are considered. Monte Carlo simulation is used to evaluate limit state probabilities. Reliability indices for current serviceability design provisions are also evaluated, and a serviceability system factor for Load and Resist ance Factor Design (LRFD) is recommended.