Impact of Specialized Hauling Vehicles and Emergency Vehicles on Bridge Load Rating

The Federal Highway Administration (FHWA) mandated states to adopt specialized hauling vehicles (SHVs) and emergency vehicles (EVs) in 2013 and 2016, respectively, in the load rating of bridges. Both the AASHTO single-unit trucks (SUs) and EVs are specially configured so that they may result in high load effects and can adversely affect bridge load rating factors. This paper investigates the impacts of rating these vehicles on the states’ bridge load ratings. An extensive literature review of the states’ load rating policies is performed. To determine whether any state can possibly be exempted from the new load ratings for SUs and EVs for Interstate highway bridges, the load effects of various state legal vehicles are analyzed and compared with those of SUs and EVs. The results of the study indicate the inevitability of executing the new load rating analysis for SUs and EVs for the vast majority of states. Weigh-in-motion data are processed to screen the potential EV traffic fleeting on the highway, and the calibrated live load factors are proposed for EVs accordingly. The load effects are found to be smaller than those FHWA originally assigned, improving the rating factors. Lastly, this paper proposes a screening tool to help state agencies to convert the known rating factors to the rating factors of SUs and EVs so that the load rating work can be prioritized for the bridges that are vulnerable to SUs and EVs.

ANALISIS NILAI KAPASITAS STRUKTUR ATAS JEMBATAN DENGAN MENGGUNAKAN METODE RATING FACTOR

ABSTRAKJembatan merupakan infrastruktur transportasi yang vital. Jika suatu jembatan mengalami kegagalan maka lumpuhlah sistem tersebut. Oleh karena itu, kajian ini bertujuan untuk mengetahui nilai kapasitas sisa jembatan eksisting sehingga dapat dinilai bahwa jembatan tersebut masih layak digunakan atau tidak. Kajian ini dilakukan pada segmen P1-P5 (arah Dawuan) jembatan Cinapel yang terletak di Kabupaten Sumedang. Jembatan ini merupakan jembatan beton prategang. Metode kajian yang digunakan adalah metode load rating factor. Dilakukan dengan menghitung kapasitas dukung gelagar dan plat lantai kendaraan. Standar perhitungan dengan mengacu pada Peraturan Penentuan Bridge Load Rating untuk Jembatan Eksisting dari Menteri Pekerjaan Umum dan Perumahan Rakyat (03/SE/M/2016). Dari hasil perhitungan didapatkan hasil bahwa nilai RF gelagar bentang tepi, bentang tengah, dan plat lantai kendaraan memiliki nilai >1 yang artinya bahwa struktur jembatan Cinapel bentang P1-P5 arah Dawuan aman dalam melayani lalu lintas yang melintasi jembatan.Kata kunci: jembatan beton prategang, load rating factor, struktur atasABSTRACTBridges are vital transportation infrastructure. If a bridge fails then the system is chaos. Therefore, this study aims to determine the remaining capacity of the existing bridge where the bridge is still suitable for use or not. This research was conducted on the P1-P5 segment (Dawuan direction) Cinapel bridge located in Sumedang Regency. This bridge is a prestressed concrete bridge. The research method used is the load rating factor method. It was carried out by calculating the carrying capacity of the girder and slab of the bridge. Calculation refer to the Determination for Existing Bridges using Load Rating Factor of the Minister of Public Works and Public Housing (03/SE/M/2016). The results of calculation obtained that the RF of the outer span girder, middle span, and slab are greater than 1 (RF > 1) which means that the structure of the Cinapel bridge span P1-P5 is safe.Keywords: prestressed concrete bridge, load rating factor, upper structure