Upper Serangoon Viaduct
TDV was approached by the Swiss Consulting Engineers Höltschi &
Schurter from Zürich to assist in this project.
The Main Contractor who had been awarded the Contract approached
BBRV, the prestressing cable supplier, who approached Höltschi &
Schurter to produce an alternative design for this viaduct.
TDV acted as conceptual Consultant in the preparation, planning
and design of the complete construction stage bridge erection
procedure. The erection procedure was greatly complicated by the
Clients requirements of no interference with the existing
traffic flow in the area.
The bridge concept for the "Upper Serangoon Viaduct" comprises
cast-in-situ twin box girders supported on a single central pier
(in the transverse direction).
The viaduct is divided into four parts. Each part acting as a
continuous structure over eight or twelve spans. The length of
one typical span is between 34.20 m and 36.50 m. The height of
the concrete box girder in a typical span is a constant 2.20 m.
The spans at the two crossings are 70 m and 50 m where the
maximum height of the concrete box girders is 3.0 m at the pier.
The chosen erection procedure resulted in two different
construction methods being chosen for the construction of the
viaduct. The typical spans being built on a launching truss
(‘span-by-span’-method), and the two crossings being built using
the balanced cantilevering method. Each bridge part acts as a
The bridge model, which was generated by the pre-processor
program RMGEOP, includes the alignment in the horizontal plane
resulting in a 3-dimensional structural analysis.
The effects of creep and shrinkage using the CEB-FIP model code
assumptions, which are implemented in the software, were
carefully considered for the various construction stages.
- Singapore North East Line - Upper Serangoon Viaduct
- Singapore Roads Authority
- Höltschi & Schurter, Switzerland
- State of Construction:
- General advice on construction stage analysis and on
site construction procedures.
- Full Structural Analysis for Construction Stage and
- Full Ultimate Load Analysis including:
- Shear reinforcement Design
- Additional reinforcement for Ultimate moment
- Full deck pre-camber design