2001 ASD Supplements - unprotected PDF - American Wood Council

L-14 MEMBER SELECTION TABLES5.1 GeneralMember selection tables provide allowable designcapacities for many common designs. Before using theselection tables, please refer to the checklist to be certainthat the tables are appropriate for your application.The tables in this Chapter provide design capacity valuesfor structural lumber and timbers. Moment capacity,M′, shear capacity, V′, and bending stiffness, EI, are providedfor strong axis bending. Tension capacity, T′, andcompression capacity, P′, are also tabulated. The applicableload duration factor, C D , is indicated in each of thetables.5.2 Selection Table ChecklistChecklist for all member types:The selection tables provide values for allowable design capacities for common species, grades, and sizes ofmembers. The tabulated values apply to members that satisfy the following conditions:ü “dry” service conditions (C M = 1.0)ü “normal” temperature range (C t = 1.0)ü members not incised (C i = 1.0)In addition, the beam and joist selection tables require the following check:ü fully laterally supported (C L = 1.0)The column selection tables include the appropriate column stability factor, C P , for the stated column lengthbased on the following condition:ü end conditions pin-pinIf any of these conditions are not satisfied the selection tables should NOT be used directly. The designershould refer to the flowchart (Chapter 1) and follow the procedures for manual calculation.AMERICAN WOOD COUNCIL