Stability - Computational Analysis and Design of Bridge Structures - page 454

3

3

2

4

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3

1

8

0

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0

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11

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16

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14 10

6

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1

Figure 14.17 The correspondent displacements (mm) under live loads that cause the
compression on the top of one rib maximal.

Figure 14.18 The first mode of buckling (out of plane) considering only the extreme live
loads in initial stress stiffness matrix ( K σ ) and including total accumulated
initial stress stiffness (from stages 1 to 3) in K 0 .

lateral plane. The corresponding critical load factors (λ) are 51.00, 62.4,
and 95.28, respectively. The critical load factor 51.00 of the first mode,
for example, means the arch bridge would enter the first bifurcated point
when the live loads are increased by 51 times. Note that it is increased by
51 times, not 50 times, as the initial stress is already accumulated in K 0 .