Frequently Asked Questions
What do the column headers for bolt design value tables 11 A-K in the NDS mean?
The first, Z||, is for main and side members loaded in the same direction parallel to grain.
The second, Zs⊥, is for a side member loaded perpendicular to grain and the main member loaded parallel to grain.
The third, Zm⊥, is for a main member loaded perpendicular to grain and the side member loaded parallel to grain.
The fourth, Z⊥, is for main and side members loaded perpendicular to grain.
Click on the following to see an illustration of each loading condition:
Parallel to grain in all members, (Z||)
Parallel to grain loading in side, perpendicular in main, (Zm⊥)
Perpendicular to grain in side, parallel to grain in main, (Zs⊥)
Perpendicular to grain loading in all members, (Z⊥)
Wood Products
- Why are the wind speeds in Minimum Design Loads for Buildings and Other Structures, ASCE 7-10 so much higher than those in ASCE 7-05?
- Where can I find information on federal specifications and standards for lumber and wood products?
- What are the design manuals for wood construction in high wind areas?
- What resources are available for wood construction in high seismic areas and why build with wood in earthquake-prone areas?
NDS
- What do the column headers for bolt design value tables 11 A-K in the NDS mean?
- Where can I find background on In-Grade Testing for the NDS supplement?
- Where can I find more information on all of the NDS references?
- What are the safety factors (factor of safety) that are used to derive allowable design values for wood fasteners, lumber design values, etc. referenced in the NDS?
- Why did shear parallel to grain (horizontal shear) design values increase in the 2001 NDS?
- If there's an existing structure where the MC<19% for southern pine timbers, could the designer back out the wet service adjustment from the NDS published design values in table 4D?
- For structural composite lumber (SCL), should the volume factor, CV, be applied to Fb* in calculation of the beam stability factor, CL, or is it intended that CV be applied following calculation of CL?
LRFD
- What is LRFD?
- What is the purpose of the NDS Format Conversion Factor, KF?
- For LRFD in the 2005 NDS®, why does the φ factor cancel out when adjusting nominal resistances using the LRFD Format Conversion Factor, KF , and the resistance factor, φ?
- For Load and Resistance Factor Designs (LRFD), many of the design examples and much of the discussion focuses on elastic stress analysis. I thought that one of the benefits of LRFD was its ability to accommodate plastic (non-linear) analysis. Why don't you cover plastic design considerations in your standards?
WFCM
dress floor plan offsets that result from wall extensions and recesses?