ABSTRACT
Radical Concrete Technology. Edited by R K Dhir and P C Hewlett. Published in 1996 by E & FN Spon, 2-6 Boundary Row, London SE1 8HN, UK. ISBN 0 419 21480 1. ABSTRACT. Cast-in-place concrete segmental bridges constructed by form travelers using the balanced cantilever method were designed for significant portions of the Sun Yat-Sen Freeway Widening Project, one of the projects in Taiwan’s Six-Year Plan. Bridges within the Project were constructed as integrated concrete box girders cast monolithically with the piers and made continuous over the mid-spans where the two cantilevers meet, thus forming a rigid framing system in resisting seismic forces. Material creep, shrinkage and steel relaxation factors were taken into consideration in the computer program for analysis. Actual construction camber at different loading stages will be measured during construction and the analysis model be adjusted to verify results. Seismic design in dynamic analysis was in accordance with the Taipei Basin Spectrum and California earthquake engineering details were applied. Earthquake in vertical direction combined with horizontal earthquake components were also considered in the project. Bridge elements of segmental design bridges subject to earthquake excitation were analyzed using different coherencies to compare and evaluate the results for seismic design of the bridges. Keywords: Continuous frame system, Cantilever segmental construction, Spectrum dynamic analysis, Multiple seismic ground motion, Time history analysis. Mr Yen-Nan Shih is Deputy Chief Engineer of the Taiwan Area National Freeway Bureau, Taiwan, R.O.C. He has hands-on experience on managing local projects and specializes in integrating advance techniques with local conditions, especially local construction practices. Mr James C.Tai is Senior Vice President of T.Y. Lin International and is also Chairman of T.Y. Lin Taiwan. He specializes in the design of cable-supported, steel truss, steel plate girder and arch bridge structures, as well as seismic resistance evaluation and retrofit design.
