| Many Presstress Concrete Ⅰ-girder bidges have been widely used in highway in Laos,Most of them are large and long span bridges.Nowadays,the vehicle loading over the bridges is increasing,but the load carrying capacity of the bridge is decreasing over time.In this research,the live load carrying capacity of I-girder bridges of the road 16 B south by selecting 1 case studies:(Huayyue bridge km.15+000,Lamam district,Sekong province),the evaluation Standard calculation will be carried out by AASHTO LRFR(LOAD AND RESISTANCE FACTOR RATING)by using design truck load HL-93.Only demand and capacity in the superstructures e.g bending moment and shear are considered in this research.·Evaluation of the bearing capacity of the repaired prestressed concrete superstructure bridge.·Research on the theory and method of the load-bearing capacity of prestressed concrete Ⅰ-beams.·Research on the bearing capacity of the superstructure considering the flexural and shear correlation.·According to AASHTO LRFR(Load and Resistance Factor Rating),the study of the load-bearing capacity of the superstructure.·Experimental evaluation for bridge repair and rehabilitation.·The research case is the prestressed concrete bridge on 16 B Laos International Road from Km15+000 Sekong Province to the border of Km30+600 Attapeu Province.16 B Laos International Road is the key point of the throat,or connects between the middle and southern parts of Laos.Heavy trailers,the trailer heads pass this road every day.Based on research,value of RF(Rating Factor)the lowest will be in the moment in inventory level such as:(Huayyue Bridge have been value the lowest is1.183 Which is larger than 1 in bridges,That shows that the bridges remain operationally safe in the current context. |
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