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New Features for WoodWorks® Sizer Version 8
This version of Sizer implements
The IBC 2006 references the ASCE 7-05.
A description of the design code changes is given below. Other changes not related to new design codes are also listed.
Several problems with program operation have been resolved; refer to the index below for bugs pertaining to engineering design, user input, program operation, output, and graphics. You may need to re-examine past projects in light of these issues.
A: Load Distribution
1. Reactions
a) Joist Reactions as UDL
A new setting allows you to output bearing reactions on joists as a UDL When activated, the program assumes that the point reaction is distributed over the distance of the joist spacing.
2. Point Loads in Concept Mode
a) Input
Input of point loads is now possible in concept mode, as described in section on Input below.
Point loads are possible for any load type
b) Application
Point loads can be applied to beams only.
A point load added at the intersection of beams will be applied to the beam with the highest load transfer number.
A point load added to a beam at a column support point will be transferred first to the beam, then to the column.
c) Distribution
Point loads are distributed to supporting members via the contribution of the load to reactions at supports.
3. Uplift Loads in Concept Mode
a) Input
Uplift loads are now possible via the input of a negative number, for any load type and any distribution.
b) Distribution
Uplift loads area distributed to supporting members via the same mechanisms as downward loads. Unfactored uplift reactions for each type are distributed to the supports.
B: Engineering Design
1. Repetitive Member Factor for Wind Loads on Wall Studs
The program now implements the design provision from IBC 2306.2.1 and AF&PA Special Design Provisions for Wind and Seismic 3.1.1.1., which changes the repetitive member factor for wall studs based upon wall stud size.
a) Checkbox in Column Mode
A checkbox in Column mode is used to indicate whether the member meets the sheathing requirements of the above design code clauses.
b) System factors
The system factors from tables 2306.2.1 (IBC) and 3.1.1.1 (SDPWS) with factors ranging from 1.5 for 2 x 4 studs and 1.15 for 2 x 12 and higher, are implemented when the following is true:
- the Repetitive Member checkbox is checked
- sheathing conditions checkbox is checked
- the joist spacing is no more than 16”
c) Load combinations
The system factor is applied only to design for those load combinations which contain a wind load. Other load combinations use the 1.15 system factor.
2. Deflection Design
a) Default Deflection Limits Input
Sizer now allows input of default deflection limits in the Design Settings for each combination of member type and deflection criterion (live and total). Refer to section on User Input below for the input mechanism
b) Factory Default Deflection Limits
The “factory” default limits when the program is shipped or the default deflection limits setting is reset, are
- Beams, solid floor joists: Live = L/360, Total = L/180
- Floor I-joists: Live = L/480, Total = L/240
- Roof Joists: Live = L/240, Total = L/180
- Columns, studs: Live = L/180, Total = L/180
Previously, the total limits for beams and joists was L/240.
c) Analysis Diagram
The program now allows you to view live and total deflection results separately in the Analysis Diagrams. See the section on Graphs and Diagrams below for details.
3. Load Duration Factor CD
a) CD in Analysis Results.
The program now a table of the CD value used for each load combination in the Analysis Results. The table is described more fully in the section on Analysis Output.
4. LVL and PSL Data
All values in the generic sample LVL and PSL database files have been updated.
5. Design Bugs
a) ) Custom Section Depth Message for SCL Design (Bug 1750)
The program was sometimes giving the message “Can’t find section” instead of the correct, more informative message when a design was attempted with an SCL section smaller than the minimum in the database.
b) Plies in Sections in Full Design Results
When a range of plies beginning with one ply is entered, the program did not cycle through the number of plies greater than 1 and failed to find multi-ply solutions that pass the design check when a specific number of plies is selected.
C: Input
1. Concept Mode Load Input
a) Load Distribution Input – Point Loads
- Added the Distribution input field, with the choices Line, Area, and Point.
- Point loads could not previously be input in Concept Mode
- Unit label changes to lbs, kips, or kN when point loads selected
b) Graphical Input of Point Loads
- Point loads are entered by clicking on a beam at a gridpoint location with the Distribution field set to Point. A single- or double- click is used according to a Preferences setting.
- - Double-clicking is the only way to add another point load to a point where a point load already exists.
c) Display and Selection of Point Loads
- The program shows the point load as a coloured circle, blue if not selected, red if selected.
- Point loads are selected by clicking on an existing point.
- Cycle through coincident points by repeated clicks, or by selecting the point load from the load list.
d) Uplift Loads
For Concept Mode, we now allow input of negative numbers in the Magnitude field for uplift loading. These loads were not previously possible in Concept mode.
e) Beam Line Loads
Double clicking now always creates a full UDL on a beam in Concept Mode. Previously, this was dependent on a Preference setting.
2. Load Options Data Group
Several of the checkbox settings regarding load entry and processing have been grouped in a data group box called Options and data labels have been expanded to be more explanatory.
a) Load Entry
- The existing Concentrated load check checkbox. It has been renamed to
Add moving concentrated load
- A new checkbox called
Enter point load as UDL, using spacing to convert
whose functionality is described in a section below.
3. Point Loads as UDL
An input field called
Enter point load as UDL, using spacing to convert
has been added to the Options data group, with the following properties.
a) Loads affected
Acts individually on each load, according to setting when the load created or modified.
b) Distribution
- Distribution changes in load list changes to “Point UDL” from “Point Load” when load created or modified with setting checked.
- Distribution in input field always says “Point Load”.
c) Magnitude
Magnitude label changes from kN, lb, kip, to kN/m, lb/ft, kip/ft.
Existing data in Magnitude input field is converted when button is checked
Must click Modify to convert existing load.
4. Other Load View Improvements
a) Tributary Width Warning
The warning regarding change in tributary width no longer appears when selecting different member types, even if the default joist spacing is different in the new member types.
5. Deflection Limits
a) Default Deflection Limits
A new feature allows users to enter default deflection limits in the Design Settings, in order that the program starts up with the deflection limits appropriate to structures you most often design. A total of 12 limits are set for the combination of
- Beams and solid floor joist
- Floor I-joists
- Roof joists
- Columns and wall studs
and
- Live
- total
deflection criteria.
These limits are imposed upon opening a new project or change in member type.
b) Factory defaults.
The program comes with default limits, given in the section on above, that are reset when “Restore Original Settings” is checked.
Preference Settings
c) Bearing reactions
A setting has been added called
Express bearing reactions on joists as UDL.
It’s effect is described in the section on Design Output.
d) Single- or double-click
This Preferences setting has been revised slightly to say
Double-click to create gridlines, columns, and point loads.
Its effect has changed slightly, see section on Point Loads in Concept Mode above.
6. Input and Program Operation Bugs
a) Load Distribution after Change in Wall Stud Spacing (Bug 1781)
When the stud spacing was changed on walls with existing trapezoidal or triangular loads, the end load magnitude was made the same as the start magnitude, creating a UDL .
b) Joist Load Deletion on Member Type Change (Bug 1741)
Loads are no longer deleted when switching from Joist member type to Beam member type in Beam View.
c) Service Condition and Treatment Persistence (Bug 1641)
Upon changing Material Type, the Service conditions and Treatment input fields were being reset to default values. They now stay the same as they were.
d) Non-editable Material Fields in Database Editor
For the Standard database files, the Material Type radio buttons and Multi-ply checkbox are no longer enabled.
D: Output
1. Load Table
This refers to the list of input loads that appears in the Design Results, the Design Check Calculation Sheet, and the Analysis Results in Beam and Column modes.
a) Units
- Added Unit for all members (previously Units was limited to single span members).
- The units have been removed from the title to the table.
b) Reorganisation
- Pattern column is now next to Distribution
- Magnitude column now comes after Location.
- Placed Units beside the Magnitudes they refer to.
c) Formatting
- Load name column reduced slightly, but still fits maximum allowable load name (15 chars.)
- Distribution text now lines up with border, like all other columns
- Corrected problems with certain data not fitting within columns.
- Changed e.g. (Eccentricity = 100.00 mm ) to (Ecc. = 100 mm) and made it fit within the “Location” column
d) Notes under Table
- If there is at least one area load this note appears for the setting “Area loads on continuous span”
Beam is a continuous support for all area loads (two equal spans)..
2. CD Factor Table in Analysis Results
The program now outputs tables at the end of the Analysis Results showing the duration factor CD used for each load combination generated for the project.
Thist table lists the load combination numbers, the combination, and the CD factor for that combination that is used in design.
3. Design Results
a) Order of Moment and Shear in Force vs. Resistance Table
Reversed the order of the moment and shear output in the Additional Data section of the Design Check output to make it consistent with the ordering elsewhere in the text output.
b) Bearing and Reactions Table
The following changes have been made to the Bearing and Reactions table of the Design Check report:
- A line showing the bearing factor CB is output even when they are all 1.0.
- Joist reactions can now be expressed as plf, kips/ft, or kN/m, that is, as line loads, using the joist spacing to convert from point reactions to line loads.
- Renamed and moved load combination row; added a '#' in front of the load combination number, (eg. #2)
4. Output Bugs
a) Precision of Feet-Decimal-Inch Distances
The precision of the feet-decimal-inch length display is increased from one- to two-digit precision. It effects decimal formatting only, not fractional formatting. The display of span lengths, load locations points of interest in beam view, load view, and point of interest view, will have two-digit precision.
b) Fastener Output
Built-up fastener specification is no longer output for one-ply members in Design Check output material details section.
E: Diagrams and Graphs
1. Column Drawing
a) Base and Top
The column drawing in the Design Check report, which is oriented horizontally, now shows “Base” and “Top” on the left and right ends.
2. Analysis Diagrams
a) Load Combination Description
- Shows load combination for bending, shear, and bearing, and serviceability combination for deflection.
- Now shows location of critical load for concentrated live loads.
b) Deflection Criteria
The program now allows you to view Live andTotal Deflection graphs separately:
- a dropdown box called Deflection results allows you to choose the deflection criterion shown
- Title of the graph reflects the diagram shown, e.g. LIVE DEFLECTION
- The deflection graph that first appears is the one for the critical load criterion.
3. Drawing and Diagram Bugs
a) Position of Support Drawing in Beam View
The drawing of the support triangles in beam view were not being centered properly in the bearing area. They have been moved over slightly to the correct position.
F: Documentation
1. On-line NDS 2005
a) Adobe Acrobat 8
The on-line design code now works with the most recent versions of Adobe Acrobat.
2. Design Code References
a) Welcome Box
A note been added to both the Welcome box and giving the editions of the IBC, UBC, and NDS used in the program, referring to the Building Codes box for further information.
b) Building codes box
The explanation of the implementation of these codes in the Building Codes message box invoked from the Welcome box has been revised.
c) Elsewhere in program
All program references to design codes have been updated, for example in the design settings input, the design results output, and in warning messages.
3. On-line help
a) Review
The on-line help has been reviewed to make sure it is up-to-date with current program operation and current design code references.
b) HTML Help
The Help system used is now HTML Help, which is compatible with the Windows Vista operating system, as well as previous versions of Windows
c) Release Notes
The release notes describing all changes to the program are now in the html file New Features, which is included with the installation, rather than in the Read Me notes