Preliminary Study of Bridge Deformation Monitoring Using GPS and CRP (Case Study: Suramadu Bridge)☆

Deformation monitoring is one alternative methods that can become the indicators of brifge feasibility. The tools that can be applied for the deformation monitoring are GPS (Global Positioning System) technology and CRP (Close Range Photogrametry, since they are effective, easy, and can be used for multitemporal application. Suramadu bridge is a landmark building of East Java that is connecting Java and Madura islands. This objective of this study is to determine the deflection of Suramadu bridge. Global Positioning System (GPS) were employed to monitor the deflection in the middle of bridge by kinematic methods using precise ephemeris data for correcting coordinate. For the entire span bridge, CRP method is applied using a non-metric camera with self callibration and space resection processing in bundle adjustment technique. The results are still preliminary views, and at the moment this study is still underway. Based on these preliminary results, it appears that there are deflection in both horizontal and vertical axes based on 3 times of observation. Using CRP, the largest horizontal deformation inclined to the east at 80 mm and a decline of 12 mm.Using CRP, the smallest horizontal deformation is about 1 mm to the east and no change to the Z axis. The next stage for the study consists of CRP entire span bridge, GPS mid-span bridge (4 points), and modeling deformation.