Finite-element modeling of log wall lateral force resistance
2005
Scott, RJ. | Leichti, R.J. | Miller, T.H.
Finite-element models were developed for a representative log shear wall and a sill log-foundation assembly that were patterned after reported tests of those assemblies. The objective was to develop a set of finite-element models for a parametric study of wall performance as affected by construction variables. The models included connection behaviors, friction, and slip between logs. Characteristics for linear and nonlinear springs that represented slip, friction, and bearing in the model were derived from test data. The force-displacement behaviors of the base models were verified with existing log wall and sill log-foundation test data. The force-displacement curves for the base models showed an initial stiffness, slip, and post-slip stiffness. Thru-rod tension and tributary roof dead load were crucial to developing normal forces that limit interlog slip. Thru-rod hole size and foundation details also affected wall performance. Increased wall aspect ratio from 1:1 to 2:1 acted to increase overall displacement more than any of the other study variables. Window and door openings included extra thru-rod hardware. Window openings did not adversely affect wall performance because extra thru-rod hardware attendant to these features compensated for the lost log-log friction. Door openings had a negative effect on initial stiffness but did not negatively affect the other performance characteristics of the wall.
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