january 12, 2016 - vancouver · gwe14-112-plw-2015-6 description drawing no. drawn by project date...

127 Walgreen Road, Ottawa, Ontario K0A 1L0

T (613) 836‐0934 F (613) 836‐8183 www.gradientwind.com

January 12, 2016 Dave Leung Westbank 1067 West Cordova Street, Suite 501 Vancouver, BC V6C 1C7 Dear Mr. Leung:

Re: Pedestrian Level Wind Mitigation Study First Baptist Church Tower ‐ Breezeways

GWE File No.: 14‐112‐PLW‐Mitigation

Gradient Wind Engineering Inc. (GWE) was retained by Westbank to conduct comprehensive wind

tunnel studies including pedestrian level wind study and a mitigation study for breezeways of the First

Baptist Church Tower, Vancouver, BC. This report summarizes findings of mitigation studies following

the main wind study which showed unacceptable winds in the breezeways on all floors of the tower.

Wind comfort was addressed in this study with two models: a 1:400 scale model to consider pedestrian

wind conditions at grade and over roofs of low rise buildings, and a larger 1:100 scale model to consider

wind conditions in more restricted areas of the high tower roof and the breezeways on all floors.

Photograph 1 illustrates the 1:400 scale model used to perform the grade level work which was reported

in report dated GWE14‐112 PLW dated December 17, 2015. Photographs 2, 3(a) and 3(b) illustrate the

model and sample sensors used to perform initial measurements on the breezeways and roof areas.

Mitigation testing was performed on screen options agreed to with Bing Thom Architects. All options

considered screen placement on the north side only as they were not required on the south elevation of

the breezeways. The tested options included:

Westbank – Bing Thom Architects – Glotman Simpson Consulting Engineers

First Baptist Tower, Vancouver: Breezeway ‐ Pedestrian Wind Mitigation 2

1. Option 1: Overlapping solid screen segments on the north elevation of breezeway balconies.

The assembly consists of three strips slightly overlapped with four‐inch gaps between segments

(see Photograph 4);

2. Option 2: Two solid screens running along both balcony edges, and one story height screens in

the middle installed on every third floor (see Photograph 5);

3. Option 3: Perforated screen with 30% porosity enclosing the full north side of the breezeways

(see Photograph 6);

4. Option 4: Perforated screen with 60% porosity enclosing the full north side of the breezeways

(see Photograph 7).

RESULTS

Figures 1 to 4 illustrate the original predicted wind conditions in colour‐coded form on three breezeway

layouts which represent the repetitive pattern over the height of the tower. As shown in the figures, the

wind comfort levels on many breezeways are predicted to be suitable for walking or standing conditions

especially during Spring, Autumn and Winter seasons, which does not satisfy the sitting comfort levels.

Results of mitigation testing are illustrated in colour‐coded form in Figures 5 through 20, summarized as

follows:

1. For Option 1, illustrated in Figures 5 through 8, wind comfort levels on all measured sensor

locations become suitable for sitting for year round.

2. For Option 2, illustrated in Figure 9 through 12, wind comfort become suitable for sitting

conditions for most of the locations except for some north balcony areas on Levels 48, 50, 51,

and 53 which are suitable for standing during Spring, Autumn and Winter.

3. For Option 3, illustrated in Figures 13 to 16, wind comfort levels become suitable for sitting for

all of the locations for year round except for the north balcony areas on Levels 50 and 53 which

are suitable for standing during spring season. For Option 4, illustrated in Figures 17 to 20, wind

comfort become sitting for most of the locations except for some areas on Levels 32, 35, 38, 48,

50, 51, and 53 which are suitable for standing during Spring, Autumn and Winter seasons.

SUMMARY AND RECOMMENDATIONS

Based on the foregoing results, we offer the following conclusions and recommendations.:



(i) All 4 mitigation options, which apply screening on the north elevations of the breezeways only,

provide adequate wind protection that significantly reduced wind speeds over the breezeways;

(ii) The most effective screening was provided by Option 1, and least effective was Option 4;

(iii) We would recommend that options 2 or 3 provide the best mitigation while minimizing the pressure

differences across the breezeways from one elevation to the other;

(iv) It is important to note that, Option 1 will likely affect the overall structural wind forces on the tower,

due to its high blockage of the air flow across the breezeways. Therefore, if this option is selected, it

will be necessary to repeat the structural wind load tests to ensure that the structural wind loads

and accelerations are not increased;

(v) Wind comfort over the high roof terraces are presented in the original pedestrian level wind study

GWE14‐112 PLW.



This conclude our wind comfort and mitigation tests for the breezeway balconies of First Baptist Tower.

Please advise us of any questions or comments.

Sincerely,

Gradient Wind Engineering Inc. Un Yong Jeong, PhD, P.Eng. Daniel Cormier, MSc, EIT. Partner Research Engineer

Vincent Ferraro, M.Eng., P.Eng. Principal GWE14‐112‐PLW Mitigation



PHOTOGRAPH 1: 1:400 SCALE MODEL TO PROVIDE REFERENCE WIND SPEEDS AT GRADE AND

ROOF LEVEL

PHOTOGRAPH 2: 1:100 SCALE DETAILED PARTIAL MODEL OF BUILDING USED FOR

MITIGATION TESTING.



PHOTOGRAPHS 3(a) AND 3(b) : 1:100 MODEL SHOWING SENSOR PLACEMENT FOR DETAILED MEASUREMENTS AND MITIGATION TESTING IN BREEZEWAYS

PHOTOGRAPH 4: MITIGATION OPTION 1 ‐ NORTH ELEVATION



PHOTOGRAPH 5: MITIGATION OPTION 2 ‐ NORTH ELEVATION

PHOTOGRAPH 6: MITIGATION OPTION 3 – NORTH ELEVATION (30% POROSITY)



PHOTOGRAPH 7: MITIGATION OPTION 4 – NORTH ELEVATION (60% POROSITY)

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*

LEVELS 32, 35*, 38 LEVELS 41, 44*, 47 LEVELS 50, 53*

FIRST BAPTIST CHURCH TOWER, VANCOUVER, BC

PEDESTRIAN LEVEL WIND STUDY

GWE14-112-PLW-2015-6

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)

JANUARY 12, 2016B.J.

FIGURE 1: SPRING

TYPICAL FLOOR PLANS

PEDESTRIAN COMFORT PREDICTIONS

127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

NOTES:1. SCALE IS APPROXIMATE.

2. PEDESTRIAN LEVEL WIND SENSOR LOCATION.

3. * REPRESENTS TESTED FLOOR

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###

#

1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24



GWE14-112-PLW-2015-7

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 2: SUMMER

TYPICAL FLOOR PLANS


127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###



3. * REPRESENTS TESTED FLOOR#



GWE14-112-PLW-2015-8

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 3: AUTUMN

TYPICAL FLOOR PLANS


127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-9

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 4: WINTER

TYPICAL FLOOR PLANS


127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###




LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*




GWE14-112-PLW-2015-10

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 5: SPRING

TYPICAL FLOOR PLANS


FOR MITIGATION OPTION 1

127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-11

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 6: SUMMER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-12

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 7: AUTUMN

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-13

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 8: WINTER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###




LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*




GWE14-112-PLW-2015-14

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 9: SPRING

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-15

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 10: SUMMER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-16

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 11: AUTUMN

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-17

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 12: WINTER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###




LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*




GWE14-112-PLW-2015-18

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 13: SPRING

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-19

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 14: SUMMER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-20

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 15: AUTUMN

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-21

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 16: WINTER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###




LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*




GWE14-112-PLW-2015-22

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 17: SPRING

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-23

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 18: SUMMER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-24

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 19: AUTUMN

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###






GWE14-112-PLW-2015-25

DESCRIPTION

DRAWING NO.

DRAWN BY

PROJECT

DATE

SCALE

1:900(APPROX.)


FIGURE 20: WINTER

TYPICAL FLOOR PLANS



127 Walgreen Road

Ottawa, Ontario

(613) 836 0934

LEVELS 7, 10, 13, 16, 19, 22*, 25

LEVELS 6, 9, 12, 15, 18, 21, 24*, 27

LEVELS 8, 11, 14, 17, 20, 23, 26*, 29

LEVELS 28, 31*, 34

LEVELS 30, 33*, 36

LEVELS 37, 40*, 43

LEVELS 39, 42*, 45

LEVELS 46, 49*, 52

LEVELS 48, 51*


1

2

5

6

7

8

13

14

19

20

11

12

17

18

23

24

PREDICTED

COMFORT

CLASSES

SITTING

STANDING

WALKING

###




january 12, 2016 - vancouver · gwe14-112-plw-2015-6 description drawing no. drawn by project date...

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