BRIDGE CONCEPT APPLIED TO REHABILITATE

NTEGRAL BRIDGE CONCEPT APPLIED TO REHABILITATE AN
EXISTING BRIDGE AND CONSTRUCT A DUAL-USE BRIDGE
R. Jayaraman, PB Merz and McLellan Pte Ltd, Singapore
Abstract

In this article two case studies are presented where the integral bridge concept
has been advantageously adapted: strengthening of an existing bridge & construction
of a new dual-use bridge. During the investigations, assessment & upgrading of an
existing prestressed concrete bridge over a tidal river, a number of proposals for
strengthening the bridge to carry heavier vehicular loads were studied. Conversion of
the existing simply supported deck to be integral with abutments was found to suit the
site conditions. Effectiveness of strengthening were confirmed by monitoring system
using strain gages & accelerometers. In the second case integral bridge concept was
successfully implemented in a D & B contract. This dual use bridge across a canal
carries six circuits of 400kV lines at soffit level and would be carrying road traffic in
the transverse direction in the future. The integral bridge using two precast posttensioned
girders connected by cast in-situ diaphragms and deck slab presented
many interesting features.

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