NBCC-2005 and Online PlusVersion 21Jager Metal ProductsJanuary 2007Changes Affecting The Truss Industry

AgendaMajor changes in NBCC-2005 CodeLoad magnitude comparison 2005 vs 1995Changes in Online PlusNew input methods, dialogue boxes, philosophyNew output formatNew Structural Analysis engineNew Settings, updated methods

Major ChangesBuilding CategoriesLoads and load importance factorsPrincipal loads Companion loadsLoad combinationsOther important changesEffects of designing with the new code

Building CategoriesIn addition to the part 4 and part 9 we are used to, part 4 now has special categories Note: If the category is not clear, get it from the building designer.

Loads and load importance factorsIn limit states design, loads are considered for either ultimate limit states (ULS) or serviceability limit states (SLS).

This means that there are 2 sets of importance factors.

Importance Factor - Snow

Importance Factor - Wind

Importance Factor - Seismic

Load types and their definitionsDdead load a permanent load due to the weight of building componentsLlive load a variable load due to intended use and occupancy (including loads due to cranes and the pressure of liquids in containers)Ssnow load a variable load due to snow, including ice and associated rain.Wwind load a variable load due to windEearthquake load and effects a rare load due to an earthquake

Where,load means the imposed deformations, forces and pressures applied to the building structure,permanent load is a load that changes very little once it has been applied to the structure,variable load is a load that frequently changes in magnitude, direction or locationrare load is a load that occurs infrequently and for a short time only.Note: This new code separates snow and live load due to occupancy

Principal loads Companion loadsPrincipal load means the specified variable load or rare load that dominates in a given load combination.Companion load means a specified variable load that accompanies the principal load in a given load combination.Principal-load factor means a factor applied to the principal load in a load combination to account for the variability of the load and load pattern and the analysis of its effects,Companion-load factor means a factor that, when applied to a companion load in the load combination, gives the probable magnitude of a companion load acting simultaneously with the factored principal load.

Load combinations for Part 4 Ultimate Limit States

Load combinations Strength (ULS)Is included in S1.0 importance factor for L (except 0.8 for Farm LHO)Iw included in WNote: once fully expanded becomes 93 load cases for regular truss.

Load combinations for Part 4 Serviceability Limit States

Load combinations Serviceability (SLS)Is included in S1.0 importance factor for L (except 0.8 for Farm LHO)Iw included in W

Other important changesSnow and 1 day rain load based on 50 year return period.Wind load also based on 50 year return periodUse of wind swept factor for snow (Cw) has been tightened. Reduction of snow load by 0.75 is limited by terrain. Cannot be used at all on high and post-disaster buildings.Exposure factor for wind (Ce) also affected by definition of open terrain vs. rough terrain.

Exposure factor for wind, CeTwo conditions:

Open Terrain level with scattered buildings, trees or other obstructions, shoreline, open water (same as 1995)

Rough Terrain suburban, urban or wooded for at least 1 km or 10 x building height

Part 9 Snow & other design requirementsGSL factor Cb for Part 9 building reduced from 0.60 to 0.55 (0.45 for clear span less than 14ft).Minimum total bottom chord load of 0.35 kPa (7 psf) for Part 9 roof trusses.Deflection limits for balconies and decks for Part 9 building.

Farm DesignNo Farm building code.NBCC-2005 code continues to make reference to the 1995 code for the design of Farm trusses.

Effects of Designing with the New Code NBC2005

Ground Snow Load/ Rain LoadNew vs Old

External Wind PressuresNew vs Old

Internal Pressures (Cpi * Cgi)Cpi = pressure coefficient, Cgi = gust factorPositive result = pressure, Negative result = Suction

Load magnitude comparison in typical load combinationsExamples

[D+S+L]Dead, snow principal, live companioni.e. Typical commercial roof truss.1995: 1.25D + 1.5S95 + 1.5L2005: 1.25D + 1.5S05 + 0.5L

Part 9 Snow Load: Calculation formula is unchanged, but Cb is changed:S=Cb*Ss+Sr (9.4.2.2)

NBC 1995 NBC 2005 S=0.6*Ss+Sr, Cb=0.6 S=0.55*Ss+Sr Cb=0.55

Online Plus version 21NBCC 2005 in Robbins

Job Manager

NBCC Setting

Truss Editor..

Uniform loading dialogue box.

Loading dialogue boxes..

Factored loadings now viewed.

NBCC Loadcases

New output format.

New Structural Engine OLP01 vs OLPNew Program Features

Whats different?Programming and analysisReference files / .bin filesMember end joints, lines, and member namePlate monitorNew Engine Switch and new categoriesSpecial plate settings and controlsLocking out of contradicting functions

Plate and lumber control files (.bin files)Lumber, plate and handling files are now controlled by the .bin files in user data rather than in the reference files as before.These numbers are now hard coded and not accessible to change. They are consistent from one user to the next.With the new plate handling file that has been made standardized, you will see differences with plate sizes on many of your joints (specific restrictions in your plate reference file that still create larger plate sizes are still valid). Please note that plate monitor does not look at the handling file when a user selects a plate with it, only structural values.

Plate and lumber control files (.bin files) cont

Reference filesNow being used for inventory purposes. Can use for lumbers that are not specified in the lumber data files.Can use Plate reference file for restrictions not used in plate handling.

Member end joints / naming conventionMember end joints and end lines are no longer valid in regards to running the structural end of the truss. The member is now designed off of the naming convention given to a truss.Examples of specific names are attic top collar, and attic bottom collar.End Joints are still required for reference points, bearings, and load locations. It will not change the analysis of the truss however as the analog is built off of the member type and physical geometry.

New plate monitorAll plates are now completely designed in the plate monitor. If a plate has been checked in this application, it is valid once it goes to the engineer.Plate monitor will not check handling however as you are stating once using plate monitor that you are not happy with the plate selected, and want to choose another plate outside of handling.No longer given the error message this plate cannot be designed in plate monitor. If you cannot find a plate, it means that no plate will work there.

OLP/OLP01 and its switchThe change from old code, to new code is quite simple. The switch in the settings file is under Structure>TPI2002/NBC2005 and change the setting from Olp to Olp01.

Becomes.

New settings list / new settingsThere are 12 new categories made specifically to work with the new program.These settings have been set up by your Jager Software representative.You must activate Olp01 to view and activate all of the settings in these categories. Dual settings in other categories now are neutralized.

New settings list / new settingscont

Specific functions to recognizeNew location for moment splicing, truss symmetry etcNew Deflection categoriesNew hard-coded functionsMany new plating functions, especially non-structural plating like- Tie plates- Stitch plating- cosmetic plating

In TPI2002/NBCC2005

Deflection.

Locking out of functionsAll settings not applicable to the new program format will automatically be locked out (for example all the settings under the Canadian Limit States Design Category). This is also true of the reverse.No American settings will be available when running Canadian design, and vice versa.

When OLP01 is chosen, CLSD and other non applicable categories are locked out

Same with US settings

ThankYou

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.IIS is a platform. ASP.NET is separate from IIS and is part of the rebust .NET Framework development environment.

2.0 is the latest version of both the .NET Framework and ASP.NET. 1.0 and 1.1 are the previous two versions of each.Note that these products are updated more frequently than the IIS platform.

Being managed code, memory leaks are less likely to occur with ASP.NET. The .NET Framework employs a garbage collection process to regularly optimize and reclaim memory.

NBCC-2005 and V6.3 Engineering by Minh Dang, MiTek Canada Inc.