Stochastic modeling of deterioration in buildings and civil infrastructure - Seismic Risk Analysis and Management of Civil Infrastructure Systems - page 424

1

0.9

LC

d ND

0.8

d SD

0.7

0.6

d SD AC

0.5

0.4

d SD SC

0.3

Mean
Bounds

0.2

0 10 20 30 40 50

n

16.10 Probability distribution for n F considering effects of corrosion
and earthquakes.

particular, with the advent of performance-based engineering methodology,
models to predict life-cycle performance of infrastructure systems are
needed. In this chapter, deterioration in a typical RC highway bridge bent
subject to earthquakes and corrosion of reinforcement is modeled. For this
purpose we used a stochastic formulation that combines shock deteriora-
tion due to earthquakes and gradual deterioration due to corrosion. Three
deterioration mechanisms are focused upon: loss of lateral stiffness of the
bridge columns due to earthquakes, loss of lateral stiffness of the bridge
columns due to corrosion, and loss of deformation capacity due to corrosion
and low-cycle fatigue of longitudinal reinforcement.
The results show that deterioration due to corrosion of reinforcement
and seismic stiffness deterioration have a signifi cant effect of the lifespan
of the bridge bent. The effect of low-cycle fatigue damage is found to be
insignifi cant on the expected lifespan of the bridge bent. The results also
show that it is important to study the combined effect of corrosion and
seismic damage. The obtained results are specifi c for the scenarios that are
similar to the analyzed one (i.e., type of bent, regional seismicity, and