LRFD for Engineered Wood Construction: Calibration to Current Designby Joseph F. Murphy, Structural Reliability Consultants, United States,
Document Type: Proceeding Paper
Part of: Structural Design, Analysis and Testing
The structural design code for engineered wood construction is evolving to a limit state design basis in which the safety checks are derived from the underlying probability distributions of strength and loads (ASCE Task Committee on LRFD for Engineered Wood Construction, 1988). As with any evolutionary change, one first checks the new methodology with existing performance. The occupancy live load and snow load safety checking equation for bending are examined. The factors to account for load duration are treated as additional safety factors. Treating the load duration factor this way means that the calculated reliability for the live load and snow load case can be different. One of the gesto of limit state design is to assure the same underlying reliability for the design life of the structure. In the United States the design life is taken to be 50 years.
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