 Case Study
Design
and reconstruction of Suyeong Bridge No. 1
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Stylish 3-span steel box
girder road bridge
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Replacement for 3 existing
bridges
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Linear and dynamic
analysis
ENVICO
Consultants used LUSAS Bridge for an alternative design
of the Suyeong Bridge No. 1 in Busan, South Korea, on behalf of
Lotte Engineering & Construction Co., Ltd. The new bridge
replaces three previous bridges that crossed the river at this
location that required replacement for traffic flow and appearance
reasons.
Overview
Suyeong Bridge No. 1 is a 3-span continuous steel box girder bridge that
carries pedestrians and a pair of 4-lane carriageways across
the Suyeong river from Millak-dong, Suyeong-gu to U-dong
Haeundae-gu. The stylish new bridge is 180m long
and has a central span of 85m and two side spans of 47.5m. The
width of the bridge is 45m, comprising 20m wide spans with a 5m
central gap between each span. Four main steel girders, varying
from 3.5m to 2.2m in depth, support a continuous steel deck.
Cantilevered pedestrian walkways with viewing areas are supported
by a steel tube strut system. Costing
47 billion Won, the construction of the new bridge
started in June 2004 and it opened for full use on 3rd February
2008.
Modelling
Using LUSAS Bridge
analysis software, thick beam and thick shell elements were used to create two models: one for a 3D linear static
analysis and one for a separate seismic analysis.
Chang Moon of ENVICO Consultants
said: "LUSAS analysis was required on this project because we
had to get section forces of girders and reactions at supports in
the most efficient manner possible." He added: "we
needed to use software that provided easy-to-use modelling
facilities and also gave us accurate results."
Of particular use to ENVICO
Consultants was the ability to define any type of
bridge loading and the extensive load combination facilities in
LUSAS. Also of great importance on this project was the ability to define and modify
varying section properties along the length of each span.
From the static and dynamic
analyses carried out, section forces, reactions, and displacements
were obtained allowing Envico to optimise and prove the design.
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Linear
static analysis model
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"LUSAS analysis was required
on this project because we had to get section forces of girders
and reactions at supports in the most efficient manner
possible."
Chang Moon, Chief
Engineer, ENVICO Consultants
Construction
company: Lotte Engineering & Construction Co., Ltd.
Structural Designer: ENVICO Consultants, CHEIL Engineering Co., Ltd.
Bridge location
Completed bridge
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