PENGGUNAAN METODE ELEMEN HINGGA UNTUK TINJAUAN NUMERIK STRUKTUR BOXGIRDER JEMBATAN BETON PRATEGANG PADA TAHAP KONSTRUKSI METODE BALANCE CANTILEVER

Abstract

The balanced cantilever construction method is suitable for prestressed long span concrete bridge structure segmental. This method is developed to remove need of scaffolding as the implementation of in-situ casting.Segmental construction process can be faster using Rapid Hardening Concrete by jacking the concrete in earlier age. Stress and displacement of the structure must be predicted exactly to prevent occur of crack and significant displacement. Jacking force to the concrete at earlier age were nonlinear analyzed in the anchorage zones to get information concrete stress and the indication of crack. This study reviewed Lemah Ireng II bridge at Semarang � Solo highways (3-spans, 2-piers). This full bridge model was numerically modelled by elastic linear frame element using Midas Civil, and in anchorage zone was a segment modeled by using nonlinear solid 3D elemen using Dassault System Abaqus. This study to get acceptable the stress and displacement of the bridge structure due to the age of concrete jacking variation take in 0.5, 1, 1.5, 2, 3, 4, and 5 days and stress and the indication of concrete crack in anchorage zones due to the age of concrete jacking variation take in 0.5, 1, 1.5, 2, and 3 days. Structure analyze of full bridge model conclude that all displacements at construction stage and long time case variation of concrete curing and jacking force are accepted in the displacement limit, whereas all stress in box girder section are accepted in stress limit except in curing 0.5 day at jacking force is 75% fpu. Structure analyze of anchorage zone conclude that jacking force can be gived minimum at one day age of concrete, although there are some crack at behind of anchorage bloc