Design of The New Upper Structure Comba Bridge in Jayapura Regency Using Prestressed Concrete

Abstract

Comba Bridge is located in the main road of Jayapura Regency. This bridge has some damages due to the density of the traffic on the bridge. In order to increase the level of service, it is necessary to figure out the solution. One of the solution is designing a new bridge beside the old bridge. The aim is to design a new bridge using prestressed concrete girder as the main structure and figure out the general construction method for this bridge. Stressing method for the main structure is post tensioning method. The new bridge has two 25 meters spans. Designing includes secondary structure design and main structure design. The analysis result show that pedestrian barrier consists of two galvanized steel railing, H-profile steel column, concrete deck slab and pavement slab using reinforced concrete with 22 cm thickness. Main structure using Precast Concrete I Girder (PCI Girder) has 4500 kN initial prestressed force and 4 cables that consist of 7-wire strand super grade. Erection method of the girder using launcher machine.