Shearwalls Tutorial 5 â Matching Published Design example (CDN)
Shearwalls Tutorial 5 – Matching Published Design example (CDN) The following Tutorial goes through example 1 starting on page 481 of the Canadian Wood Council’s Wood Design Manual 2015 edition. Following the clause 11.4.5 of the CSA O86-14, it is possible to eliminate or reduce the number of hold-downs within a shearwall, but the process is iterative and time consuming to do by hand or with a spreadsheet. Shearwalls is capable of performing these iterations very quickly and can save designers a lot of time. The Jhd factor applies a strength reduction to a shearwall segment based on a function of the height of the shearwall, the lengths of the shearwall segments, the overturning restraint force and the basic shear capacity. To eliminate hold-downs, it is necessary for the overturning tension force to be resisted by the wood sheathing of the segments. Click here to download the shearwalls file (.wsw) which will be created by going through this tutorial. It is worth noting that there a number of limitations for shearwall segments without hold-downs: 1. 2. 3. 4.
Maximum nail diameter of 3.25 mm Minimum nail spacing of 100 mm Maximum specified shear strength of 10.3 kN/m Maximum shearwall height of 3.6 m
Shearwalls Tutorial 5 – Shearwalls Example 1 (Pg 481 of 2015 WDM)
5.1 Define Settings Define the initial settings and preferences for your project.
Design Settings 1. Click on the Settings, Design Tab. 2. Unclick the box Include deflection Analysis. 3. Make sure shearwalls rigidity per unit length is set to Use shearwall capacity to approximate rigidity. 4. Click OK.
Shearwalls Tutorial 5 – Design Settings
5.2 Structure Blocks & Levels 1. Click on the Structure button. 2. Create a Structure Block, and adjust its dimensions so that the X and Y locations are both set to 0 (m), set the X extent equal to 15 (m), and the Y extent equal to 10 (m). 3. Set the Number of Levels equal to 2. 4. Set the Wall heights of Level 1 and Level 2 to 3 (m). 5. Set the Floor/Ceiling depth of 300 mm between each level. 6. Adjust the Foundation elevation equal to 0 (m). 7. Under Diaphragm flexibility, uncheck the rigid analysis checkbox. Note: The Y extent is irrelevant for this problem as manual loads will be generated for the shearline along the southern most wall (Shearline A).
Shearwalls Tutorial 5 – Creating Structure Block
5.3 Create Openings for Levels 1 and 2 1. 2. 3. 4.
Click on Walls View. Click on Openings View. Toggle Shearline A-1. Add the following openings on both levels 1 and 2 along shearline A-1:
Offset from Edge (m)
Width (m)
Height (m)
Offset from Bottom (m)
4
2
1.2
1
11
2
1.2
1
Note: It is not necessary to input the wall openings for both levels. If the openings are input on level 1 before extending walls upwards, the openings will automatically be created on the second storey.
Shearwalls Tutorial 5 – Adding Openings in Shearline B
5.4 Extending Walls Upwards and Defining Roof Block 1. Click on the Extend Walls Upwards Button.
2. Click on Roof Blocks, and ensure that the roof is set to flat.
5.5 Creating Standard Walls As default, all of the walls on level 1 should be specified as exterior with hold-downs, and all of the walls on level 2 will be specified as Exterior with Anchorages. It is necessary to modify the Standard wall type to match the framing details of example 1: shearwalls on page 481 of the Wood Design Manual 2015. As well, there is a slight difference in the framing details between levels 1 and 2. The following table has been created to see the small differences of the framing between the two levels. Level
Sheathing Type
Sheathing Thickness
Edge Nail Spacing
Hold-down Configuration
1
OSB
11 mm
100 mm
Hold-downs on all Segments
2
OSB
11 mm
150 mm
Ends of Shearwalls & w. req.
For this problem, it is only necessary to modify the loads on wall A-1, as no load will be applied to the other three walls of the structure. Although the same details will be specified for the walls on each storey.
Modifying Wall B-1 on Level 1 1. 2. 3. 4. 5.
Set the Current Level to 1. Click on Walls. Click on ctr+a, to toggled all the walls on the storey. Specify a hold-down configuration of Hold-downs on all segments. Specify the following parameters for the Exterior Side: a) Material is OSB Const. b) Marking is 2R24. c) Thickness is 11 mm. d) Orientation is Horizontal. e) Click on Blocking Box. f) Fasteners type as Power-driven nails. g) Fasteners Length of 2-1/2”. h) Fasteners Diameter input 3.25 mm. i) Fastener Edge Spacing as 100 mm. j) Fastener Interior Spacing as 300 mm. k) Framing material as Lumber. l) Framing Species as S-P-F. m) Framing Grade as No.1/No.2. n) Framing Thickness b as 38 mm. o) Framing Width d as 89 mm. p) Framing Stud Spacing as 400 mm. q) End studs at left is 2. r) End Studs at Right is 2. s) Specify Hold-down HDU2-SDS2.5 for the Left and Right Ends of the wall
Shearwalls Tutorial 5 – Modifying Standard Walls 5. Specify the following parameters for the Interior Side: a) Material is GWB Type X. b) Thickness is 12.5 mm. c) Orientation is Horizontal. d) Click on Blocking Box. e) Fasteners type as Drywall Screws. f) Fasteners Length of 1-1/4”. g) Fastener Edge Spacing as 200 mm. h) Fastener Interior Spacing as 300 mm.
Shearwalls Tutorial 5 – Interior wall details on level 1
Modifying Wall B-1 on Level 2 1. 2. 3. 4. 5. 6.
Set the Current Level to 2. Click on Walls. Click ctrl+a to toggled all of the walls on level 2. Go to Form View. Specify a hold-down configuration of Ends of Shearwalls & w. req. Specify the following parameters for the Exterior Side: a) Material is OSB Const.
b) Marking is 2R24. c) Thickness is 11 mm. d) Orientation is Horizontal. e) Click on Blocking Box. f) Fasteners type as Power-driven nails. g) Fasteners Length of 2-1/2”. h) Fasteners Diameter of 3.25 mm. i) Fastener Edge Spacing as 150 mm. j) Fastener Interior Spacing as 300 mm. k) Framing material as Lumber. l) Framing Species as S-P-F. m) Framing Grade as No.1/No.2. n) Framing Thickness b as 38 mm. o) Framing Width d as 89 mm. p) Framing Stud Spacing as 400 mm. q) End studs at left is 2. r) End Studs at Right is 2. s) Specify Hold-down HDU2-SDS2.5 for the Left and Right Ends of the wall 7. Specify the following parameters for the Interior Side: a) Material is GWB Type X. b) Thickness is 12.5 mm. c) Orientation is Horizontal. d) Click on Blocking Box. e) Fasteners type as Drywall Screws. f) Fasteners Length of 1-1/4”. g) Fastener Edge Spacing as 200 mm. h) Fastener Interior Spacing as 300 mm.
5.6 Applying Manual Loads Skip the Building Site and Generate Loads buttons, as loads will be manually applied for this tutorial. 1. Click on the Loads and Forces button.
Shearwalls Tutorial 5 – Loads and Forces 2. Set the current Level to 1. a) Click on wall A-1, Click Add…, b) Click on Add as a factored force directly (parallel) to the shearline. c) Select Type of load as Wind Shear d) Select Profile type as Point Load e) Modify Levels to From 1 To 1. f) Modify Location to Apply to… Shearline A g) Set Wind Direction to West to East. h) Specify a Magnitude of 40 kN. i) Set Distribution method as Both. j) Click OK.
Tutorial 5 – Add Wind Load on Level 1 3. Set the current Level to 2, Click on wall A-1, Click Add…, a) Click on Add as a factored force directly (parallel) to the shearline. b) Select type of load as Wind Shear. c) Select profile type as Point Load. d) Modify Levels to From 2 To 2. e) Modify Location to Apply to… Shearline A. f) Set Wind Direction to West to East. g) Specify a Magnitude of 20 kN. h) Set Distribution method as Both. i) Click OK. 4. Click on wall A-1, Click Add…, a) Select type of load as Dead Load. b) Check the Wall box. c) Select profile type as Line Load. d) Modify Levels to From 1 To 2. e) Specify Location to Apply to… Wall Line A f) Specify From X= 6 to X= 11. g) Specify a Magnitude of 0.55 kN/m for the entire shearline.
h) Click OK. 5. While still toggled on wall A-1 on level 1, Click Add…, a) Select type of load as Dead Load. b) Select profile type as Line Load. c) Modify Levels to From 1 To 2. d) Specify Location to Apply to… Wall Line 1 e) Specify From X= 0 to X= 15. f) Specify a Magnitude of 0.55 kN/m for the entire shearline. g) Click OK.
5.7 Review Loads on Levels 1 and 2 In total on level 1, there should be 5 load inputs: 1. 40 kN wind shear load Line Element Line A 2. 0.55 kN/m dead load on Element Line A 3. 0.33 kN/m dead load on Element Wall on Wall Line A In total on level 2, there should be 4 load inputs: 1. 40 kN wind shear load Line Element Line A 2. 0.55 kN/m dead load on Element Line A 3. 0.33 kN/m dead load on Element Wall on Wall Line A
5.8 Run Design and Compare Design Results to Wood Design Manual 1. Click on Run Design. 2. In the Results View, click on Go To Table, Wind Design, Flexible Diaphragm Design, Shear Results. 3. Compare Wind Shear results to those calculated in the Wood Design Manual 2015. 4. Click here to download a pdf of the design results.
Shearwalls Tutorial 5 – Wind Shear Results
Maximum nail diameter of 3.25 mm Minimum nail spacing of 100 mm Maximum specified shear strength of 10.3 kN/m Maximum shearwall height of 3.6 m
Shearwalls Tutorial 5 – Shearwalls Example 1 (Pg 481 of 2015 WDM)
5.1 Define Settings Define the initial settings and preferences for your project.
Design Settings 1. Click on the Settings, Design Tab. 2. Unclick the box Include deflection Analysis. 3. Make sure shearwalls rigidity per unit length is set to Use shearwall capacity to approximate rigidity. 4. Click OK.
Shearwalls Tutorial 5 – Design Settings
5.2 Structure Blocks & Levels 1. Click on the Structure button. 2. Create a Structure Block, and adjust its dimensions so that the X and Y locations are both set to 0 (m), set the X extent equal to 15 (m), and the Y extent equal to 10 (m). 3. Set the Number of Levels equal to 2. 4. Set the Wall heights of Level 1 and Level 2 to 3 (m). 5. Set the Floor/Ceiling depth of 300 mm between each level. 6. Adjust the Foundation elevation equal to 0 (m). 7. Under Diaphragm flexibility, uncheck the rigid analysis checkbox. Note: The Y extent is irrelevant for this problem as manual loads will be generated for the shearline along the southern most wall (Shearline A).
Shearwalls Tutorial 5 – Creating Structure Block
5.3 Create Openings for Levels 1 and 2 1. 2. 3. 4.
Click on Walls View. Click on Openings View. Toggle Shearline A-1. Add the following openings on both levels 1 and 2 along shearline A-1:
Offset from Edge (m)
Width (m)
Height (m)
Offset from Bottom (m)
4
2
1.2
1
11
2
1.2
1
Note: It is not necessary to input the wall openings for both levels. If the openings are input on level 1 before extending walls upwards, the openings will automatically be created on the second storey.
Shearwalls Tutorial 5 – Adding Openings in Shearline B
5.4 Extending Walls Upwards and Defining Roof Block 1. Click on the Extend Walls Upwards Button.
2. Click on Roof Blocks, and ensure that the roof is set to flat.
5.5 Creating Standard Walls As default, all of the walls on level 1 should be specified as exterior with hold-downs, and all of the walls on level 2 will be specified as Exterior with Anchorages. It is necessary to modify the Standard wall type to match the framing details of example 1: shearwalls on page 481 of the Wood Design Manual 2015. As well, there is a slight difference in the framing details between levels 1 and 2. The following table has been created to see the small differences of the framing between the two levels. Level
Sheathing Type
Sheathing Thickness
Edge Nail Spacing
Hold-down Configuration
1
OSB
11 mm
100 mm
Hold-downs on all Segments
2
OSB
11 mm
150 mm
Ends of Shearwalls & w. req.
For this problem, it is only necessary to modify the loads on wall A-1, as no load will be applied to the other three walls of the structure. Although the same details will be specified for the walls on each storey.
Modifying Wall B-1 on Level 1 1. 2. 3. 4. 5.
Set the Current Level to 1. Click on Walls. Click on ctr+a, to toggled all the walls on the storey. Specify a hold-down configuration of Hold-downs on all segments. Specify the following parameters for the Exterior Side: a) Material is OSB Const. b) Marking is 2R24. c) Thickness is 11 mm. d) Orientation is Horizontal. e) Click on Blocking Box. f) Fasteners type as Power-driven nails. g) Fasteners Length of 2-1/2”. h) Fasteners Diameter input 3.25 mm. i) Fastener Edge Spacing as 100 mm. j) Fastener Interior Spacing as 300 mm. k) Framing material as Lumber. l) Framing Species as S-P-F. m) Framing Grade as No.1/No.2. n) Framing Thickness b as 38 mm. o) Framing Width d as 89 mm. p) Framing Stud Spacing as 400 mm. q) End studs at left is 2. r) End Studs at Right is 2. s) Specify Hold-down HDU2-SDS2.5 for the Left and Right Ends of the wall
Shearwalls Tutorial 5 – Modifying Standard Walls 5. Specify the following parameters for the Interior Side: a) Material is GWB Type X. b) Thickness is 12.5 mm. c) Orientation is Horizontal. d) Click on Blocking Box. e) Fasteners type as Drywall Screws. f) Fasteners Length of 1-1/4”. g) Fastener Edge Spacing as 200 mm. h) Fastener Interior Spacing as 300 mm.
Shearwalls Tutorial 5 – Interior wall details on level 1
Modifying Wall B-1 on Level 2 1. 2. 3. 4. 5. 6.
Set the Current Level to 2. Click on Walls. Click ctrl+a to toggled all of the walls on level 2. Go to Form View. Specify a hold-down configuration of Ends of Shearwalls & w. req. Specify the following parameters for the Exterior Side: a) Material is OSB Const.
b) Marking is 2R24. c) Thickness is 11 mm. d) Orientation is Horizontal. e) Click on Blocking Box. f) Fasteners type as Power-driven nails. g) Fasteners Length of 2-1/2”. h) Fasteners Diameter of 3.25 mm. i) Fastener Edge Spacing as 150 mm. j) Fastener Interior Spacing as 300 mm. k) Framing material as Lumber. l) Framing Species as S-P-F. m) Framing Grade as No.1/No.2. n) Framing Thickness b as 38 mm. o) Framing Width d as 89 mm. p) Framing Stud Spacing as 400 mm. q) End studs at left is 2. r) End Studs at Right is 2. s) Specify Hold-down HDU2-SDS2.5 for the Left and Right Ends of the wall 7. Specify the following parameters for the Interior Side: a) Material is GWB Type X. b) Thickness is 12.5 mm. c) Orientation is Horizontal. d) Click on Blocking Box. e) Fasteners type as Drywall Screws. f) Fasteners Length of 1-1/4”. g) Fastener Edge Spacing as 200 mm. h) Fastener Interior Spacing as 300 mm.
5.6 Applying Manual Loads Skip the Building Site and Generate Loads buttons, as loads will be manually applied for this tutorial. 1. Click on the Loads and Forces button.
Shearwalls Tutorial 5 – Loads and Forces 2. Set the current Level to 1. a) Click on wall A-1, Click Add…, b) Click on Add as a factored force directly (parallel) to the shearline. c) Select Type of load as Wind Shear d) Select Profile type as Point Load e) Modify Levels to From 1 To 1. f) Modify Location to Apply to… Shearline A g) Set Wind Direction to West to East. h) Specify a Magnitude of 40 kN. i) Set Distribution method as Both. j) Click OK.
Tutorial 5 – Add Wind Load on Level 1 3. Set the current Level to 2, Click on wall A-1, Click Add…, a) Click on Add as a factored force directly (parallel) to the shearline. b) Select type of load as Wind Shear. c) Select profile type as Point Load. d) Modify Levels to From 2 To 2. e) Modify Location to Apply to… Shearline A. f) Set Wind Direction to West to East. g) Specify a Magnitude of 20 kN. h) Set Distribution method as Both. i) Click OK. 4. Click on wall A-1, Click Add…, a) Select type of load as Dead Load. b) Check the Wall box. c) Select profile type as Line Load. d) Modify Levels to From 1 To 2. e) Specify Location to Apply to… Wall Line A f) Specify From X= 6 to X= 11. g) Specify a Magnitude of 0.55 kN/m for the entire shearline.
h) Click OK. 5. While still toggled on wall A-1 on level 1, Click Add…, a) Select type of load as Dead Load. b) Select profile type as Line Load. c) Modify Levels to From 1 To 2. d) Specify Location to Apply to… Wall Line 1 e) Specify From X= 0 to X= 15. f) Specify a Magnitude of 0.55 kN/m for the entire shearline. g) Click OK.
5.7 Review Loads on Levels 1 and 2 In total on level 1, there should be 5 load inputs: 1. 40 kN wind shear load Line Element Line A 2. 0.55 kN/m dead load on Element Line A 3. 0.33 kN/m dead load on Element Wall on Wall Line A In total on level 2, there should be 4 load inputs: 1. 40 kN wind shear load Line Element Line A 2. 0.55 kN/m dead load on Element Line A 3. 0.33 kN/m dead load on Element Wall on Wall Line A
5.8 Run Design and Compare Design Results to Wood Design Manual 1. Click on Run Design. 2. In the Results View, click on Go To Table, Wind Design, Flexible Diaphragm Design, Shear Results. 3. Compare Wind Shear results to those calculated in the Wood Design Manual 2015. 4. Click here to download a pdf of the design results.
Shearwalls Tutorial 5 – Wind Shear Results
