INVESTIGATION OF THE COLLAPSE OF THE CINCIN LAMA BRIDGE WITH CONSIDERATION OF FATIGUE DAMAGE

Abstract

The Cincin Lama bridge is a crucial component of a major road in Java Island, Indonesia. It comprises six spans of the Callender Hamilton-type truss bridge, with each span measuring 50 meters. Tragically, one of its six spans collapsed during operation on April 17th, 2018. To understand the cause behind this incident and extract valuable lessons from it, an investigation utilizing finite element analysis was initiated. The primary objective of this investigation was to pinpoint the root cause that precipitated the collapse of the bridge. To achieve this critical goal, the investigation commenced with a thorough examination of the site investigation reports, coupled with an assessment of the bridge's adherence to the Indonesian design code applicable during its construction. Subsequently, the bridge underwent analysis based on the most recent Indonesian codes, taking into account the estimated ultimate load experienced at the time of the accident. To consider the possibility of pre-existing defects that may have contributed to the collapse, a fatigue analysis was also conducted. To ensure a precise estimation of the traffic load, weight in motion (WIM) data was utilized in the fatigue analysis. Through this detailed examination, it was revealed that the collapse was most likely triggered by a combination of an overloaded truckload and accumulated fatigue damage prior to the accident. The knowledge gained from this investigation will undoubtedly contribute to the improvement of safety measures and engineering practices in the construction of bridges, ensuring a more secure infrastructure for Indonesia's transportation network.