Estimasi Kapasitas Fatik Struktur Jembatan Baja Standar Bina Marga Terhadap Umur Layan

Abstract

Bridges are one of the most important infrastructures that support national social and economic activities. Increased socio-economic activities lead to an increase in the number of road users, which results in dynamic loads and reactions of bridge structures. Bridges are part of one type of infrastructure that receives repeated traffic loads. Traffic loads are load cycles that result in collapse or fatigue even if the yield strength is not exceeded under dynamic and repeated loading. Bridge condition evaluation is important to ensure that the capacity of the bridge structure is consistent with its service life. This paper aims to estimate the fatigue capacity of Bina Marga Standard steel bridge structures from a service life perspective. This is done by analyzing the structure and considering vehicle loading, including cycles with stress range output, and comparing it with cycle stress-number range curves (S-N curves) for nominal fatigue strength. SNI and AASHTO are useful as fatigue evaluation methods using the S-N curve method. This research can provide information about the feasibility of bridge capacity with current traffic conditions, predict the service life of the bridge structure by considering current traffic conditions, estimate the service life of the bridge structure, and provide recommendations to agencies related to the research results obtained, allowing them to make decisions and follow up on them. The methods used are literature studies, collection of bridge structure data and traffic data, processing traffic data, modeling bridges on Midas Civil Academic Version 2023, analyzing bridge structures, and evaluating service life against fatigue criteria. The fatigue life estimation results show that the composite type bridge has nominal fatigue resistance on the S-N curve will not exceed its strength during the planned service life of 50 years, and is projected to reach fatigue life at 57 years for the Binjai-Langsa toll road section.