NDS 10.3 - CLT Adjustment Factors

Adjustment factors applicable to CLT Design are given in NDS Table 10.3.1:

• Load Duration Factor C_D
• Temperature Factor C_t,
• Bearing Area Factor Cb,
• Column Stability Factor CP .

Table 10.3.1 also includes the following factors which have no effect on CLT floor, roof, or wall panel design in Sizer:

Moisture Factor CM

NDS 10.3.3 says that information on moisture factors is supplied by manufacturers, and as most manufacturers do not recommend wet service, the program assumes dry moisture conditions and a CM = 1.0.

Beam Stability Factor CL

CLT floor and roof panels are continuously laterally supported on both edges, as the one-foot design width is supported by the rest of the panel. CLT wall panels are also continuously supported. Lateral support spacing is considered on the depth d face for wall panels for the CP factor for axial compression, but this is not the direction for lateral support for out-of-plane bending design. The one-foot design width on the b face is continuously supported.