ANALYSIS OF FACTORS INFLUENCING ELEVATION OF BALANCED CANTILEVER STRUCTURE FOR PRECAST SEGMENTAL BOX GIRDER BRIDGE CONSTRUCTION

  • Gambiro Gambiro PT Wijaya Karya Beton, Bekasi, Indonesia
  • Heru Purnomo Universitas Indonesia, Depok, Indonesia

Abstract

In balanced cantilever scheme, starting from a pier box girder segments are jointed one after another to form cantilever structure by applying post tensioning system and keeping partially completed structure balanced about the pier in double cantilever. Cantilever structure consisted of jointed box girder segments
spanning from 2 piers after closure will transform to a continuous beam structure. Deflection and camber of cantilever structure depends on several factors, which exist during all stages of construction. Among those factors, creep, modulus of the concrete at various ages, loss of prestress, tendon position and
temperature are considered influencing the deflection and camber of the cantilever. In this work, a 2D construction model using ADAPT was employed to evaluate the deflection and camber of jointed box girder segments that form double cantilever during the balanced cantilever construction process under
several situations by assuming concrete segments experiencing constant temperature and humidity, and by employing the same factors used for prestressed losses calculation during all construction stages. Pier effect was not taken into account in this study. Two different creep models ACI 209 and CEB-FIB 1990,
two  different  tendon  positions  and  numerical  simulation  with  different  nodal  number  were  conducted permitting evaluation of the cantilever elevation during construction process. Analysis was particularly focused for a real box girder bridge as part of Pasupati fly over, constructed between years 2005-2006 at
Bandung in the West Java province in Indonesia. Based on laboratory results of cube specimens taken from the construction site, modulus of concrete at various ages were introduced into the simulation. Evaluation was conducted by comparing the calculated elevation of cantilever under several situation mentioned above to the design elevation of the fly over for its construction process. The results from this work showed that CEB-FIB creep model and straight tendon position has better results compared to other models by taking reference to the design elevation. The results were obtained after applying sufficient
additional nodal number in the 2D model.

Published
2011-08-01
How to Cite
GAMBIRO, Gambiro; PURNOMO, Heru. ANALYSIS OF FACTORS INFLUENCING ELEVATION OF BALANCED CANTILEVER STRUCTURE FOR PRECAST SEGMENTAL BOX GIRDER BRIDGE CONSTRUCTION. EACEF - International Conference of Civil Engineering, [S.l.], v. 1, p. 039, aug. 2011. Available at: <http://proceeding.eacef.com/ojs/index.php/EACEF/article/view/381>. Date accessed: 19 may 2024.
Section
Group of Structural and Construction Engineering