|
|
|
|
|
Important Note – These are descriptions to changes implemented in version 10 and may not reflect current program behaviour.
The program now implements Cross-Laminated Timber (CLT) design as per CSA O86-14 Update 1, Chapter 8.
A CLT database file, clt.cws has been created and added to the installation using the stress grades in Table 8.2.3 with design properties in Table 8.2.4.
The following changes have been made to the input of materials and member configuration in Beam and Column View
In Beam View, the member types Floor panel and Roof panel are added. For Column view, Wall panel has been added.
The Species field contains the species used in the species combinations in Table 8.2.3.
Grade shows the stress classes corresponding to the species.
Width input is disabled and set to 1000 mm for metric and 12" for imperial. Design assumes a fixed strip of that width.
Depths show the standard CLT depths of 3-7/16", 4-1/8", 5-1/2", 6-7/8", 7-9/16", 9-5/8" and 12-3/8" (87, 105, 139, 175, 191, 243, 245, and 315 mm)
It is not possible to enter a custom depth.
The Plies input is renamed Layers, is disabled, and shows the number of CLT layers in the layup corresponding to the depth.
An input for Panel orientation includes the choices Longitudinal and Transverse. Longitudinal means that the outermost layers are parallel to the member span; Transverse that they are perpendicular. Design using the major strength axis is performed for Longitudinal, and the minor axis for Transverse.
Only 1 exposed side for fire design is available.
1- or 2-ply 12.7 or 15.9 mm gypsum wallboard fire protection is available.
A checkbox allows you to apply the 20% vibration span increase for non-structural elements from A.8.5.3
In Load View, the Width field is active for all point loads and area loads, is disabled, and shows one foot or one meter.
In the load list, a point load is called a Point UDL.
Area loads are equivalent to line loads, as the line load is assumed to be distributed over the one-foot or one-meter width of the member.
Point loads are assumed to be distributed over the one-foot width of the member.
A data group in the settings has been added called CLT Vibration allowing you to specify whether vibration design using A.8.5.3 is performed, and to allow you to enter a percentage span adjustment increase as allowed by O86 A.8.5.3 Note 3.
An input in load view allows you to indicate whether creep factor Kcreep is to be used to implement A8.5.2 for long-term deflection. The program allows you to modify the creep factor, with the default being 2.0 from A.8.5.2.
Effective stiffness (EI)eff is calculated using 8.4.3.2.
Shear deflection is implemented using an approximate procedure that algebraically modifies the E value to emulate the effects of the uniform simple-span equation in A.8.5.2. Research has shown that this can be very inaccurate for unbalanced loading or spans, and we are developing an improved procedure to be implemented in a future version.
The effective shear modulus is calculated using 8.4.3.2.
The program implements the following design code clauses.
A vibration criterion is added showing the largest center-to-center span on the member, and the maximum allowable vibration span Lv from 8.5.3, and the ratio between them.
In the Additional Data section for deflection, an asterisk is shown referring to the Calculations section which shows GAeff and EIeff from 8.4.3.2.
CLT beams ae depicted showing alternating uniform layers and layers composed of repeated end-grain.