prestressed steel structures in p j t f th 2008 b ... convention/s4-4... · beam string structure,...

Prestressed Steel Structures in P j t f th 2008 B ijiProjects of the 2008 Beijing

Olympic Games

Liu Hang, Li ChenguangBeijing Building Construction Research Institute

P. R. ChinaApril 2008

1

2008 PTI TECHNICAL CONFERENCESESSION 4 - PRESTRESSED STEEL STRUCTURES IN PROJECTS OF THE 2008 BEIJING OLYMPIC GAMES LIU HANG, LI CHENGUANG

(C) COPYRIGHT POST-TENSIONING INSTITUTE, ALL RIGHTS RESERVED of 44

Introduction

Prestressing Technology is widely used in different kinds of steel structures.As a long span structure, prestressed steel structures often seem more flexible, especially in , p ythe construction process, which results in difficulties to establish the prestress. Beam string structure, the suspen-dome structureBeam string structure, the suspen dome structure and cable-net structure are commonly used in China.Applications in the Chinese National Sports HallApplications in the Chinese National Sports Hall, the Badminton Gymnasia for the 2008 Olympic Games and the Century Lotus stadium in Foshan City Guangdong province are introduced

2

City, Guangdong province are introduced.



Prestressed Steel Structures

PrestressedPrestressed steel structures

Prestressed cables

Steel structuresstructures Steel structures

（truss, grid, shell, etc.）

3



Advantagesg

Interactional behaviors of prestressed cables pimprove redundant degree.High tensile strength of cables.Inverted camber caused by prestress.Tension members be precompressed before l d dloaded. The mechanical behaviors of the structure are improvedimproved.

4



Beam String Structure

5



Beam String Structure (one-way) g ( y)

6



Applications in the 2008 Olympic Gamespp y p

The National Sports Hall.

The Table Tennis Gymnasia.

Tsingdao Sailing Center.

The Training Gymnasia for theOlympics.

7

y p



National Sports Hallp

8Two-way beam string structure (114×144.5m)



Structure Drawingg

9Span 114m×144.5m



Sectional Drawingsg

L i di l di iLongitudinal direction

10Transverse direction



Accumulative Sliding Constructiong

11Play the Movie



Composition of Prestressed CablesComposition of Prestressed CablesComposition of Prestressed CablesComposition of Prestressed CablesWhite or colored White or colored polythene coatpolythene coat

Galvanized steel Galvanized steel wires with diameterwires with diameterwires with diameter wires with diameter of 5mm or 7mmof 5mm or 7mm

Black polythene liningBlack polythene lining

12



Cross section of a cableCross section of a cableCross section of a cableCross section of a cable

13



A h S f h C blA h S f h C blAnchorage System of the CableAnchorage System of the Cable

Cold cast Cold cast CableCableanchorageanchorage Adjust sleeveAdjust sleeve Fixed endFixed end

14



Model Test of the National Sports Hallp

A 1/10 scale model was designed andA 1/10 scale model was designed and constructed.Different tensioning processes of the g pprestressing tendons are tested and verified.The model was tested under twice of the design vertical load.

15



Li D i f th M d lLine Drawing of the Model

16



Transverse Direction of the Model

17



Longitudinal Direction of the Modelg

18



Plan of Cables

19



Model under Construction

20



Model under Vertical Load

21



Inverted Camber

10

12

er(m

m) Axi s 13

Axi s 14Axi s 15

6

8

an C

ambe Axi s 16

2

4

Mid

-sp

00 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 5 6 7

Tension Process

22



Internal Forces of the Cables

2500

3000

(kgf

)

Axi s 9Axi s 10Axi s 11Axi s 12 1600

1800

2000

kgf)

1000

1500

2000

rnal

For

ce o

f Cab

le(

Axi s 13Axi s 14Axi s 15

600

800

1000

1200

1400

rnal

For

ce o

f Cab

le(k

Axi s E

0

500

0 5 10 15 20 25Tension Process

Inte

r

0

200

400

600

0 5 10 15 20 25Tension Process

Inte

r Axi s FAxi s GAxi s H

Transverse direction Longitudinal directionTension Process Tension Process

23



Suspen-Dome

24



Applications in the 2008 Olympic Gamespp y p

The Badminton GymnasiaThe Badminton Gymnasia

25Circular plan, Diameter=93m



Introduction

Total building area: 24 383m2Total building area: 24,383m .7,508 seats.Suspen-dome is used as the roofSuspen-dome is used as the roof structure, with a diameter of 93m.

26



The Roof Structure

27



Cables and tension rods

Grid Dome StructureStrut

28Ring CableRadial Tension Rod



Prestressing Forces of the Ring Cablesg g

Prestressing forces are established throughPrestressing forces are established through tensioning ring cables, which includes 3 stages.

Stage Tension force / Controlled force

1st ring cable

Force/kN

2nd ring cable

Force/kN

3rd ring cable

Force/kN

4th ring cable

Force/kN

5th ring cable

Force/kN

1 70% 1693 860 534 249 118

2 90% 2177 1106 687 320 152

3 110% 2661 1351 839 391 185

29

3 110% 2661 1351 839 391 185



Inverted camber

80

60

70

80实测值

理论值

40

50

60

值 m

m

20

30

起拱

值

0

10

30

1 2 3 4 5 6 7 8 9 10 11

起拱值测点编号



Cable-net structure

31



The Century Lotus Stadium of Foshan City, G d P iGuangdong Province

32



Introduction

Total building area: 123,125m2.g ,36,000 seats. Circular Plan, diameter=310m.Double-layer cable net structure is used as roof structure.PVC membrane is covered on the roof unfoldedPVC membrane is covered on the roof,unfolded area is:72,482m2.The cable net structure is composed of a internal ring cable, 40 radial upper cables, 40 radial lower cables and many hanger cables, total weight about 600t.

33

600t.



34



Structure of Main Cables

35



Construction Process

Place the ring cable at the middle of thePlace the ring cable at the middle of the ground.Using 40 temporary strands to lift the ring g p y gcable to an altitude higher than the design altitude.Install the upper radial cables.Uninstall the temporary strands.Install the lower radial cables.Install the hanger cables and the membrane.

36

g



Internal Forces of the Temporary Strandsp y

500

600

MP

a)

300

400

500

mp

Stra

nds(

M

100

200

Stre

ss o

f Tem Group 1

Group 2Group 3Group 4

00 1 2 3 4 5 6 7 8 9 10


S

Group 5

37



Internal Forces of the Upper Radial Cablespp

350

400

e(M

Pa)

200

250

300

rRad

ial C

able

Group 1

50

100

150

ess

of U

pper

Group 1

Group 2

Group 3

Group 4

G 5

0

50

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22Construction Process

Stre Group 5

38



Internal Forces of the Lower Radial Cables

250

300

e(M

pa)

150

200

250

r Rad

ial C

able

Group1

50

100

ress

of L

ower

Group1

Group2

Group3

Group4

Group5

010 11 12 13 14 15 16 17 18 19 20 21 22


Str Group5

39



Internal Force of the Ring Cableg

300

350

400

200

250

300

ss（

MP

a ）

Group1

50

100

150

Stre

s Group1

Group2

Group3

Group4

Group50

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21Construction Process

Group5

40



Vertical Displacement of the Ring Cablep g

2. 5

3

m)

1. 5

2

plac

emen

t(m

0

0. 5

1

Dis

p

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21Construction Process

41



Temporary Strands Lifting the Ring Cablep y g g

42



The Stadium During Constructiong

43



Thanks！

44



prestressed steel structures in p j t f th 2008 b ... convention/s4-4... · beam string structure,...

Documents