duddingston loch pier
TRANSCRIPT
-
8/10/2019 Duddingston Loch Pier
1/32
-
8/10/2019 Duddingston Loch Pier
2/32
CONTENTS
1: VISUALREPRESENTATIONOFDESIGN
2: DESIGNCONEPT
3: BOARDWALKINCONTEXT
4: SITEPLAN
5. FLOORPLAN
6: CONCEPTDIAGRAM
7: EXPLODEDAXONOMETRIC
8-11: CALCULATIONS- POSTANDPRIMARYBEAMS
12-14: DETAILDRAWINGS
15-16: CALCULATIONS- SECONDARYBEAM
17-19: SECTIONS
20-21: RENDERS
22: ELEVATION
23-25: SECONDSTORY
26: SECONDSTORVISUAL
27-28: WILLOWWEAVE-NAILS
29: RENDER30: CREDITS
-
8/10/2019 Duddingston Loch Pier
3/32
1
-
8/10/2019 Duddingston Loch Pier
4/32
Our primary interests were in traditional wooden construction and designing with wooden joints, principly inspired by Crannogs vernacular
architecture. We then researched more modern examples including the mathematical bridge in Cambridge which we felt was apt due to its
mathematical focus of the project. A sculptural piece by Ai WeiWei built out of old temple parts was also an inspiration for its
traditional oriental joinery.
A key feature in our design was to get people as close to the water as possible, close enough on a lower level to engage and touch it. On
top of this we created a pond space to allow for a closer interaction with the wildlife. As a sight of natural beauty, we chose the site taking
into account the present habitat of the birds. We also desired to get out into the centre of the loch to envoke a sense of awe at the beautiful
stillness and topography.
Its trajectory into the loch was taken so you would view the most picturesque areas of wildlife to the east. However, we wanted areas
providing panoramic views which were accomodated by a raised platform.
2
-
8/10/2019 Duddingston Loch Pier
5/32
3
-
8/10/2019 Duddingston Loch Pier
6/32
1:1250 Site Plan 4
-
8/10/2019 Duddingston Loch Pier
7/32
1:200 Plan 5
-
8/10/2019 Duddingston Loch Pier
8/32
A key aspect of our design was to create a series of view points. We decided on three areas, focusing on different
elements of the loch and surrounding scenery. The principle walkway runs continuously at the same level allowing
access for all users. The design steps down at the end of the boardwalk bringing users closer to the water and the
birds.
6
-
8/10/2019 Duddingston Loch Pier
9/32
Exploded Axonometric 7
-
8/10/2019 Duddingston Loch Pier
10/32
COLUMNS
Check loading on column A
The chosen column dimension 200 x 200 mm (200 x 195 in Table 12:Geometrical properties of regularised softwood)
Total area of floor carried by column = 2.2 x 1.575 = 3.47 m
2
(column carries half of the adjacent spans).Therefore, the total load carried by each column P = 3.47 x 5.5 (+4.5 pedestrian load) = 23.59 kN
For stress class D40, the compressive strength parallel to the grain fc,0,k= 26 N/mm2
Consider actual construction details and conditions in determining effective
length Lefor buckling (the height the column can buckle):
Le = 3000 mm
From Table 3:Strength classes and characteristic values for common timbers(Table 1 from BS EN 338:2003)):
E0.05= 9.4 kN/mm2, therefore
The slenderness ratio , where the radius of gyration about the axis of the section
x-x rxx= 56.3mm (from Table 12: Geometrical properties of regularised softwoods).
Using these values (Table 14: Values for the slenderness modification factor kc,yin HARDWOODS in
terms of the material properties of the stress class and the slenderness of the column), for D40
strength, the slenderness modification factor is obtained k c,y= 0.7471
The permissible stress in the column f c,0,dis:
kc,90= 1 as there is no increase the bearing strength because the applied length of the uniformly
distributed load qis 3000 mm > 150 mm (typical value for most beams under UDL)
The actual compressive stress
The check fo r buck li ng s trength is suf fi ci en t when and the co lumn is the re fo re safe
against buckling.
Therefore the column is safe against buckling.
E0.05
fc,0,k=
9400
26=361.5
y =Le
rxx=
3000
56.3= 53.3
fc,0,d=
kmod
kc,90 klsfc,0,k
M
=
0.50 1.0 1.126
1.3=11.0N/ mm
2
c=
P
A=
23.59 103
200 200=0.590 N/mm
2
c kc,y fc,0,d
c =
0.590
kc,y
fc,0,d=
0.747111.0 =8.22N/ mm2
0.590 8.22N/mm2
1:500 Post Plan 8
-
8/10/2019 Duddingston Loch Pier
11/32
-
8/10/2019 Duddingston Loch Pier
12/32
Spans and heig hts
PR IMARY BEAM
LOADING
Domestic; long term action
Live load (impose) 5.0 kN/m2
Self weight (planks) 0.5 kN/m2
Total q 5.5 kN/m2
FLOOR JOIST S IZE
1. Mechanical Propert ies
We have chosen a hardwood, green oak, with Strength Class D40.
The grade stresses for D40 were taken from Table 3:Strength classes and characteristic values for
common timbers (Table 1 from BS EN 338:2003).
Bending, fmk 40 N/mm2
Compression parallel fc0k 26 N/mm2
Compression perp fc90k 8.8 N/mm2
Shear fvk 3.8 N/mm2
Mean Elasticity Modulus E 11000 N/mm2
2 . Sect ion
Rectangular section 100 x 295 mm
From Table 12: Geometrical properties of regularised softwoods:
Area A = 29.5 x 103 mm2
Second moment of inertia Ixx= 213.94 x 106 mm4
Section modulus Zxx= 1450.4 x103mm3
1:500 Primary Beam Plan 10
-
8/10/2019 Duddingston Loch Pier
13/32
-
8/10/2019 Duddingston Loch Pier
14/32
-
8/10/2019 Duddingston Loch Pier
15/32
This is the most complicated joint implemented in our scheme. We had to use large timber
posts which easily stay within the safety regulations. This large sizing was neccessary toallow for the joints we chose to work. The beams themselves had to be of a certain
diameter for the mortice and tenon (2) and bridle joints (1) to work.
Here the purple lines show where these connections take place.
2.
1.
1.
2.
1:10 Connection Details 13
-
8/10/2019 Duddingston Loch Pier
16/32
These connections involving two primary beams and a secondary beam
are used in four locations on our boardwalk. The secondary connections
throughout our design use a mortise and tenon joint with a dowel fixing.
Once again the coloured line shows where these connections take
place within our design.
1.
2.
1.
2.
1:10 Connection Details14
-
8/10/2019 Duddingston Loch Pier
17/32
SECONDARY BEAM
LOADING
Domestic; long term action
Live load (impose) 5.0 kN/m2
Self weight (planks) 0.5 kN/m2
Total q 5.5 kN/m2
FL OOR JOIST SIZE
1. Mech anical Propert ies
The grade stresses for D40 (green oak) were taken from Table 3: Strength classes andcharacteristic values for common timbers (Table 1 from BS EN 338:2003).
Bending, fmk 40 N/mm2
Compression parallel fc0k 26 N/mm2
Compression perp fc90k 8.8 N/mm2
Shear fvk 3.8 N/mm2
Mean Elasticity Modulus E 11000 N/mm2
2. Sect ion
Rectangular section 75 x 147 mm
From Table 12:Geometrical properties of regularised softwoods:
Area A = 11.03 x 103 mm2
Second moment of inertia Ixx= 19.85 x 106 mm4
Section modulus Zxx= 270.1 x103mm3
3. Modif icat ion factors
Strength modif icat ion factor kmod
Service Class 3: external uses, fully exposed (Table 7:Service Classes (Table NA.2 from NAD))
Load duration: permanent
Material: solid timber
Therefore (from Table 6: Strength modification factor kmod(Table 3.1 from EN 1995-1-1:2004)), kmod= 0.50
Size factor kh
d = 147 mm
k! = min !"#
!
!.!
= min !"#
!"#
!.!
= 1.004
(From Structural Timber Design to Eurocode 5)
Therefore kh= 1.0
Instabi l i ty facto r kcr it
Full torsional constraint of the beam, therefore kcrit=1.0
The load sharing fac tor k is is assumed to be 1.1 as the beam (floor joists) span 2.1 m, which is less
than 6m apart (from Table 9:Description of assemblies and load distribution systems)
1:500 Secondary Beam Plan 15
-
8/10/2019 Duddingston Loch Pier
18/32
-
8/10/2019 Duddingston Loch Pier
19/32
-
8/10/2019 Duddingston Loch Pier
20/32
1:20 Section BB
B
B
To ensure that the primary beam was efficient in its use of materials,
with minimum excess in cross section, we alternated the secondarybeam connections. This layout can be seen in the diagram above.
18
-
8/10/2019 Duddingston Loch Pier
21/32
-
8/10/2019 Duddingston Loch Pier
22/32
20
-
8/10/2019 Duddingston Loch Pier
23/32
21
-
8/10/2019 Duddingston Loch Pier
24/32
221:200 North Elevation
-
8/10/2019 Duddingston Loch Pier
25/32
-
8/10/2019 Duddingston Loch Pier
26/32
1:50 Section DD
D
D
This section shows the configuration of the secondary
platform and its relationship with the orignal.
24
-
8/10/2019 Duddingston Loch Pier
27/32
251:200 North Elevation
-
8/10/2019 Duddingston Loch Pier
28/32
26
-
8/10/2019 Duddingston Loch Pier
29/32
-
8/10/2019 Duddingston Loch Pier
30/32
To attach the decking to the secondary beams we have employed wrought
hand made iron nails. This furthers our theme of heritage as these nails
have been used for thousands of years on projects such as the Mary Rose.
28
-
8/10/2019 Duddingston Loch Pier
31/32
29
-
8/10/2019 Duddingston Loch Pier
32/32
CREDITS
GROUPWORK:
JUSTIFICATION
LAYOUTDRAWINGS
SECTIONDRAWINGS
DISCUSSIONOFTHEDESIGN
INDIVIDUALWORK:
1. DETAILDRAWINGSANDSECTIONS- JACKCRIPPSS1118304
2. SCHEDULEOFCALCULATIONSWITHDIAGRAMSANDPLANS- MATTPEPPERS1105037 ANDRACHELBRAUDES1115488
3. AXONOMETRICDRAWINGAND3DRENDERS- MARTINSKARBACKS1142587
30