Structural Design Topics in Wood Construction  - May 16-18, 2016 - The Hotel Roanoke & Conference Center - Roanoke, Virginia
Structural Design Topics in Wood Construction  - May 16-18, 2016 - The Hotel Roanoke & Conference Center - Roanoke, Virginia

General Information

Who Should Attend

The primary audiences for this course are registered design professionals, structural engineers, wood truss engineers, wood truss designers, truss manufacturers, post-frame designers, EWP designers, building code plan reviewers and inspectors, and general contractors that want to expand their general knowledge of wood as a building material and their knowledge of building design beyond the introductory level. Manufacturers and suppliers of building products used in the construction of wood-frame buildings may also benefit by the discussion of lumber design values, impact of in-service moisture content changes, and wood building structural design issues that impact the performance of wood buildings in-service.

Overview of Course Content

This course offers a buffet of topics often faced by wood design professionals, yet background information and references on the topics are not readily accessible. A summary of the course units follow.

In the first unit on Lumber Grading Methods and Design Values, we will review the methods used to "mechanically" grade or "visually" grade structural lumber, how allowable stresses are derived from test data, safety factors for lumber, and the how the outcomes of grading methods affect the design properties of the manufactured product.

In Wood Shrinkage Issues in Construction, we will review the relationship between timber shrinkage and moisture content (MC), how environmental humidity and temperature dictate the equilibrium moisture content of lumber, and demonstrate through examples how changes in MC can impact dimensional stability in wood framing and connections.

In Reliability Considerations for Wood-Frame Multi-Family Balconies, the AWPA Use Category System (UCS) that includes "service conditions" and "use environment" will be reviewed in the context of a wood-framed multi-family balcony. Potential ways to clearly specify the requisite preservative treatment will be presented for products qualified under the AWPA system or through a Code Evaluation Report.

The superior fire performance of timbers can be attributed to the natural charring of wood. The char layer acts as an insulator and protects the core of the wood section. In Fire: Design Tools for Code-Conforming Wood Construction, we will review Chapter 16 of the NDS on Fire Design of Wood Members and Technical Report 10 (TR10) Calculating the Fire Resistance of Exposed Wood Members which were both revised in 2015 to include design provisions and fire test data for unprotected Structural Composite Lumber and unprotected Cross-Laminated Timber. Additional resources for flame-spread performance, fire rated wood floor and wall assemblies, and component additive method will be discussed.

In Design of Multi-Ply Residential Girders and Headers, we compare the design span results for headers that are assumed to have full lateral support (braced) versus the case of a dropped header (assumed to be unbraced). We will also address the issue of annoying floor vibration as impacted by the joist and girder stiffness design.

In Glulam Beam Design, we will review how to size and specify glulam beams and present design examples for laterally supported and unsupported glulam beams with design checks for bending, shear and deflection (short- and long-term). The significance of drying checks in glulam will also be discussed.

In Multiple-Bolt Wood Connection Design, participants will review a model code requirement through the NDS to check "local stresses" in multiple-bolt connections. Design methods offered in the NDS for calculating the additional failure modes for multiple-bolt connections due to "local stresses" will be demonstrated by calculations.

In Design Considerations for Preventing Flat Roof Failures from Gravity Loads or Sustained Live Loads, we will discuss the well-known problem area of the collapse of "flat-roofs" due to ponding and snow/ice accumulation. A rational design method for accounting for long-term deflection of MPC parallel-chord roof trusses will be demonstrated.

In Diaphragm and Shear Wall Design, we will present load path concepts and basic design methodologies for resisting lateral loads due to wind and seismic events. Examples will illustrate design of framing, panels, chords and tie-down anchorage. We will illustrate how to apply appropriate adjustment factors for Allowable Stress Design (ASD) and Load and Resistance Factor Design (LRFD) and discuss sources of design values for diaphragms/shear walls.

Post-frame buildings differ somewhat from typical light-frame wood construction with respect to framing member size and spacing, and often corrugated steel panels are used to sheath the buildings. In Post-Frame Building Design and Diaphragm/ Shear Wall Tests, we present a streamlined design method that follows the procedures used in light-frame wood diaphragms and shear walls. An example will be presented showing how to design the diaphragm, shear wall, sidewall posts and post embedment depth.

In Wood Truss Repair Design Techniques, the instructor will review his general approach for the repair of roof and floor trusses to include documentation of the damage, data required for the repair, materials for the repairs, typical design values for the selected materials, and specifications for the materials to be used. A sample of -several repair drawings will be discussed.

In Permanent Truss Bracing Design, procedures for calculating the required lateral bracing restraint forces in webs and chords without sheathing (as for piggyback trusses and valley sets) will be presented. The prescriptive permanent bracing details given in 2015 Building Component Safety Information (BCSI) will be reviewed.

In Lateral Loading of Decks due to Occupants and Design Considerations, the results of laboratory tests of full-size decks at Washington State University will be presented. The subject decks were loaded by occupants under a variety of dynamic loading cases. Video of the testing will be shown and design strategies to resist lateral deck loading will be discussed.

In Cross-Laminated Timber (CLT) – Applications, Availability and Design, the design benefits and features of CLT construction, the availability of CLT in the US, and related structural design standards will be presented.

Course Materials and CEU Credit

A notebook containing course materials, the 2015 Building Component Safety Information Book, lunch on Tuesday, continuous refreshment service, and a certificate for 1.6 CEU's (16 hours) are included in the registration fee. Also, this course is approved for continuing education credit required of certificate holders by the Jack A. Proctor Virginia Building Code Academy of the Virginia Department of Housing and Community Development.


For more specific information on course content, please contact Dr. Frank Woeste at (540) 951-0469, or e-mail:

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