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Single-element simulations were performed to help verify implementation of the wood model. Two sets of simulations are shown in figures 2 and 3 that use default material properties for southern yellow pine at room temperature. The first set is for tension parallel to the grain. The second set is for compression perpendicular to the grain. Note that both stiffness and strength vary as a function of moisture content. These simulations indicate that saturated pine properties provide the lowest stiffness and strength in both tension and compression. The posts tested statically and dynamically by the user and analyzed by the developer are all saturated (23-percent moisture content). The test posts were pulled from the field throughout Nebraska, so saturation is a reasonable test and analysis condition.
Figure 2. Good correlation between LS-DYNA simulations (dashed lines) and measured
clear wood data (solid lines) for southern yellow pine in tension parallel to the grain.
Figure 3. Good correlation between LS-DYNA simulations (dashed lines) and measured clear
wood data (solid lines) for southern yellow pine in compression perpendicular to the grain.
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FHWA-HRT-04-096
