Cable-stayed bridges - Computational Analysis and Design of Bridge Structures - page 365

1

0

0

1

0

18

0 0 0 0

2 8 10 12 14

0 0 30

63

0 0 0 0

110

42

35

24

14

8

0 0 0 0 0 1

Figure 11.33 Girder displacements (m) in vertical (top) and lateral (bottom)
directions when construction loads increase to 46 times at the maximum
single-cantilever stage.

11.6 illustrated exaMPle With dynaMiC
Mode analysis of Panyu Bridge,
guangdong, PeoPle's rePuBliC of China

In this example, a concrete cable-stayed bridge with a main span of 380 m
(1247′) is briefly introduced for the purpose of dynamic mode analysis.
This bridge is located in Panyu, China, and is a typical concrete cable-
stayed bridge. It is modeled as 714 elements and 475 nodes in total by using
Visual Bridge Design System (Wang and Fu 2005). Figure 11.34 shows its
elevation.
A full floating system is used in this bridge; the first natural mode is in
a horizontal pendulum movement. Figure 11.35 shows the first bending
mode with a radian frequency of 3.78 rad/sec ( f (f = 1.06 Hz). Figure 11.36
shows the first torsional mode with a radian frequency of 4.23 rad/sec
( f = 1.18 Hz).

117

71 90 380 90 71

Figure 11.34 The elevation of Panyu Bridge, Guangdong, China.