2001 ASD Supplements - unprotected PDF - American Wood Council

ASD STRUCTURAL LUMBER SUPPLEMENTL-15For manual calculation, two approaches are possible:1) review the design equations in the chapter and modifythe tabulated values as necessary; or 2) compute designcapacity directly from the tabulated design values and adjustmentfactors.To compute the design capacity for a specific condition,apply the design equations directly. Tabulated designvalues are provided in the NDS Supplement and designadjustment factors are provided in Chapter 4 of thisSupplement.5.3 Capacity TablesCapacity tables are provided as follows:Table 5.1 = tension membersTable 5.2a = studs (axial compression load only), C D = 1.0Table 5.2b = studs (axial compression load only), C D = 1.15Table 5.3 = compression members (columns)Table 5.4 = joistsTable 5.5 = beamsRefer to the selection table checklist to see whetheryour design condition meets the assumptions built intothe tabulated values. Note that the load duration factor,C D , is shown at the top of the table. Thus, the memberdesign capacity can be used directly to select a memberthat meets the design requirement.Examples of the development of the capacity tablevalues are shown in the Appendix.5MEMBER SELECTION TABLESAMERICAN FOREST & PAPER ASSOCIATION