Cable Bridge Design

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  • Topic: Concrete, Truss, Beam
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  • Published : March 3, 2013
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UNIVERSITY OF NIŠ
Faculty of Civil Engineering and Architecture

Design and Calculation
Design
of Cable-Stayed Bridge
Diploma Thesis

Ana Spasojević

Task
Design a pedestrian concrete bridge over the river
pedestrian
Nišava in Niš, according to the conditions defined by:
– cross section of the regulated river channel (waterways) – site plan (location plan)
– technical solution for the bridge substructure

Technical data:
Technical





span of the bridge: 70.0 m
70.0
available deck width: 4.0 m
4.0
free height above the flood flow: 0.70 m
0.70
installations on the bridge: electrical installations for bridge illumination
– material of the deck: reinforced concrete, prestressed

2

Content of the presentation
Task
Task
General data of the bridge
General
Description of bridge structures
Description
– superstructure:
girder
girder
pylon
pylon
stay cables
stay

– substructure

Analysis of bridge structures
Analysis
– static analysis
– dynamic analysis

Some details
Some
– reinforcement plans
– assemblage of main girder
3

General data of the bridge
According to the given conditions and the accepted concept of precast According
superstructures the bridge is designed as a cable-stayed beam, with cable
two spans 14.0+56.0=70.0 m
The superstructure of the bridge consist of: prestressed concrete deck The
with 3+2x3 stay cables and one pylon placed on the left river flood plan. Finished road level is set low in the bridge zone; to respect the conditions Finished
of free opening above the flood flow, the designed solution has small constant height of the deck: 77.0 cm between the finished road level to the bottom surface of the structure.
The bridge is of constant height along the whole span
The

Desna obala
197.450

Leva obala

196.300
195.60

195.600

193.200

193.125

193.125

M .V. 190.525
190.025

4

General data of the bridge
view of the bridge: upstream side

Desna obala
197.450

Leva obala

196.300
195.60

195.600

193.200

193.125

193.125

M .V. 190.525
190.025

Beside the functionality, strict vibration’s and stability conditions, the Beside
aesthetic appeal of the bridge was important design constraint. Finished road level is straight and inclined longitudinally towards the Finished
left river bank (i=1.37%)
5

General data of the bridge
bridge
plan of the bridge

TOK
197.45

420

9
197.31
10
10

2%

2%

25

9
197.35

330
1400

25

25

25

6
197.11

8
196.86

520

420

1400

1400
25

1.375 %

25

6
196.39

350

196.30

175

175

7660
1400

350

1400
330

The center line of the bridge is straight, while the center line of the The
river flow in the bridge zone has curvature of 400.0 m in radius, and intersects the center line of the bridge almost perpendicularly. The deck width is 4.2 m, with both side lateral inclination of 2.0 % The

from the center line
Free profile is 2x2.0/2.5 m along the whole span - passing beside the Free
pylon or stay cables.

6

Description of bridge structures
superstructure: girder
girder

Spanning structure:
Spanning




prestressed concrete girder (C 45), boxed cross section.
formed of precaste segments, 14.0 m of length.
the height of the girder is constant along the span, with 73.0 cm in the center line, and 68.5 cm form the bottom edge of corona to the bottom surface of girder (intrados)
215.119

D esna obala
L eva obala
195.600
195.626

193.125

193.125
192.525

Nasuto tlo

195.60

V. V .195.00

195.619

193.200

196.589

196.549

196.346

196.098

195.819

195.000

197.359

197.319

197.116

196.868

196.589

196.396

192.525

193.200
192.313

192.219

190.500

NPV

Nasuto tlo

M .V .190.525

190.419

190.025

Peskoviti {ljunak
186.700

2 x HW O120
/

2 x HW O100
/

Laporovita glina

l= 22.0 m...
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