Evaluasi Kinerja Struktur Atas Jembatan Sardjito 1 dengan Metode Pushover Analysis

Abstract

Indonesia is a region that is very vulnerable to earthquake disasters. The earthquake can cause damage to existing infrastructure, one of which is bridge structure. There are many types of bridges in Indonesia, the common types are truss. Truss bridge had started before 1945 and has continued until now so that many bridges have reached their design life (Bina Marga, 2009). Therefore, it is necessary to evaluate the seismic performance to determine the performance level of the existing bridge structure. The evaluation in this research was carried out on the structure of the Sardjito 1 Bridge located in Yogyakarta. The construction of the bridge was carried out in 1984. In this research, the analysis was carried out in a non-linear way using the pushover analysis method. In this method, the bridge will be given a lateral load in the form of an earthquake load at a predetermined reference point. The load will be increased continuously until the bridge structure collapses. So, it can be seen the level of structure performance that refers to the ATC-40 standard according to the capacity curve that occurs. The results are as follow, the maximum total drift of a pushover in the X direction is 0.00095 and Y direction is 0.010. The two maximum values of total drift indicate that the structure belongs to Immediate Occupancy performance level. This means that the bridge structure can withstand earthquake loads that occur so that the structure can be concluded to be safe.