1996 LRFD Supplements - unprotected PDF - American Wood Council

GUIDELINELRFDTOSTRUCTURALLRFD FOR STRUCTURALLUMBER SUPPLEMENTCOMPOSITE LUMBER 3939For manual calculation, two approaches are possible:1) review the design equations in the chapter and modifythe tabulated values as necessary; or 2) compute factoredresistance directly from the reference strength values andadjustment factors.To compute the factored resistance for a specific condition,apply the design equations directly. Referencestrength values and design adjustment factors are providedin Chapters 3 and 4 of this supplement, respectively.5.3 Selection TablesThe selection tables are provided in the same order asthe information in the previous sections, which followsthe same order as in the AF&PA/ASCE 16-95 standard:Table 5.1 = tension membersTable 5.2 = studs (axial compression load only)Table 5.3 = compression members (columns)Table 5.4 = joistsTable 5.5 = beamsTable 5.6 = studs (combined axial compression& bending)Refer to the selection table checklist to see whetheryour design condition meets the assumptions built intothe tabulated values. Note that the tabulated values arefully factored (i.e., include both the time effect factor, λ,and the resistance factor, φ) for the assumed design conditions.Thus, the factored force or moment on the membercan be used directly to select a member that meets thedesign requirement.Examples of the development of the selection tablevalues are shown in the Appendix.5MEMBER SELECTION TABLES