Curved concrete bridges - Computational Analysis and Design of Bridge Structures - page 179

C.G.

Rigid link

(a)

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2

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2
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4

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3

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(b) Prototype Single-element model Multielement model

Figure 6.6 Super- and substructure connection. (a) Bearing-supported connection. (b) Mono-
lithic connection. (Data from CalTran, “Structural Modeling and Analysis,” LRFD
Bridge Design Practice, August 2012, http://www.dot.ca.gov/hq/esc/techpubs/
manual/bridgemanuals/bridge-design-practice/pdf/bdp_4.pdf.)

Figure 6.7 provided by VBDS (Wang and Fu 2005). For multicell
box bridge, either a spine beam model with multicell properties is
used or a grillage model with each beam line associated with its
respective web is adopted. The section properties for longitudinal
frame elements are modeled as shown in Figure 6.8 (Nutt and
Valentine 2008). A x is considered as the tributary cross-sectional
area of longitudinal segment as shown in the figure. A y for vertical
shear counts on the area of web only, and A z for transverse shear is
considering the area of tributary deck and soffit slabs in the same
figure. I zz and I yy represent the tributary moments of inertia with
respect to horizontal and vertical axes, respectively. J is estimated by
using the total torsional moment of inertia divided by the number of
webs to assume equally divided. For multicell boxes, transverse sec-
tion properties can be assumed as combined transverse deck and
bottom slab properties with respect to the box neutral axis.