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BRIDGE CONCEPT APPLIED TO REHABILITATE


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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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