Post on 04-Jun-2018
transcript
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
1/36
Design of Hardanger Suspension Bridge
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
2/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
3/36
Design team 6 from Bridge Section
2 from NPRA
2-3 consultants (Norconsult AS)
Other specialists in wind engineering
meteorology, geology and tunnelling,concrete technology
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
4/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
5/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
6/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
7/36
General view
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
8/36
Box girder cross section
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
9/36
Guide vanes and vortex spoiler
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
10/36
Inspection and maintenance trolley
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
11/36
Towers
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
12/36
Cross beams in tower
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
13/36
Rock anchors
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
14/36
Rock anchor details
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
15/36
Main cables
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
16/36
Main cables Aerial spinning
19 strands in each cable
528 wires in each strand
Wire diameter 5.30 mm Wrapping: wire diameter 3.5 mm
Cableguard: Polyethylen (PE) Installation of a dehumidification system
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
17/36
Dehudimification system
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
18/36
Suspender and sockets
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
19/36
Cross section of suspender cable
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
20/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
21/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
22/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
23/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
24/36
Design basis Wind measurements at the bridge site
Wind tunnel investigations- Terrain model
- Section model of the bridge girder
CFD analysis / numeric simulation of the
wind flow
Geological investigations for the towersand the main cabel anchorages
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
25/36
Wind tunnel terrain model
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
26/36
Buffeting theory of wind load The shape factors are valid for
fluctuating wind loads as well as formean wind loads.
Wind fluctuations converts momentarily
to load fluctuations.
The bridge girder is a line-like (small
diameter) object without influence onthe overall properties of the flow.
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
27/36
21
2
2
( , )
( , )( , )
D D
L L
S M
q x t C D
q x t U C Bm x t C B
=
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
28/36
cos sin 0
( , ) sin cos 0
0 0 1
y D
tot z L
S
q q
x t q q
q m
= =
q
[ ]T
( , )x t u w=v andT
( , ) y zx t r r r = r
212
2
D
L
M
C DV C B
C B
=
q 12
2 2
22
2
D D L
q L D L
M M
C D C D C BV C B C D C B
C B C B
= +
B
12
2 2
2 0
2 0
2 0
D D L
ae L D L
M M
C D C D C B
V C B C D C B
C B C B
= +
C212
2
0 0
0 0
0 0
D
ae L
M
C D
V C B
C B
=
K
( , )tot q ae aex t = + + +q q B v C r K r&
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
29/36
Flutter derivatives (FD)
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
30/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
31/36
Stability limit flutter velocity Selberg flutter
Wind tunnel measurements
Multimode analysis in frequency domain
Analysis in time domain (direct timeintegration)
Analysis in time domain and modal
coordinates
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
32/36
0 0.2 0.4 0.6 0.8 1
-2
-1
0
1
2Eigenmodes
x/L
i,
i=zor
First vertical symmetric
Second vertical symmetric
First torsion symmetric
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
33/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
34/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
35/36
8/13/2019 Bjrn Isaksen - Design of Hardanger Suspension Bridge
36/36
0 20 40 60 80 100 120-10
-8
-6
-4
-2
0
2
V [m/s]
[deg]