Stochastic modeling of deterioration in buildings and civil infrastructure - Seismic Risk Analysis and Management of Civil Infrastructure Systems - page 412

specifi ed by Caltrans Seismic Design Specifi cations (Caltrans, 2006). The
seismic characteristics of the bridge site, such as the probability of earth-
quakes and ground motion characteristics, used in this study are typical for
San Francisco and are not specifi c to a particular site. San Francisco is
selected because it is located in a seismically active region and due to its
proximity to sea; structures are likely to experience corrosion.

16.4.1 Case study

Figure 16.2 shows a typical single-column bent used in RC highway bridges
in California, where H is the column height and Mg is the weight of the
bent where M is the mass and g is acceleration due to gravity. Table 16.1

Pier cap

H

Column

Mg

16.2 A typical bridge bent ( g = acceleration due to gravity).

Table 16.1 Structural properties of the RC bridge column

Property Value Units

H 5000 mm

D g 850 mm

H / D g 5.88

f ′ c 27.56 MPa

f y 551.00 MPa

f su / f y 1.58 -

ρ 2.20 % l

ρ 0.13 % s

4 P u / π D g f ′ c 0.095 kN