Abstract
In recent years, with the rapid development of social economy and highway transportation, the phenomenon of overweight transportation is increasingly serious, which is the main reason for the frequent occurrence of bridge collapse accidents in our country, causing heavy economic losses and casualties to the society.Due to the lack of unified bridge load limit management standards at the national level, it is difficult to fundamentally improve the adverse situation of bridge overload operation by relying on the existing overlimit management measures.Based on this background, we made the following work:(1) load carrying capacity check and calculation of prestressed hollow slab bridge: check whether the bridge used meets the requirements of the specification, so as to provide a reliable engineering basis for the analysis of load limit value in the following paper.According to the 04 specification, the load carrying capacity of the car is checked and calculated to verify whether the bridge meets the design requirements of the load carrying capacity.Then, the mid-span deflection of the bridge and the crack resistance of the main beam are checked to determine whether the bridge meets the design requirements in the normal limit state of use.(2) prestressed hollow slab bridge limit load values adaptability analysis first, calculates the design safety grade level on the limit load of prestressed cored slab jointless security levels of primary, secondary and tertiary limit load vehicle load effect, on this basis, from bearing capacity limit state and serviceability limit state analysis of the bridge limit load values of adaptation.
Highlights
With the development of society and economy, highway bridge transport vehicles in the trailer, the development of large-scale and containerization, large monomer type truck, semi-trailer train, car, vehicles, such as train using the vehicle type is increasing, has brought the serious harm to bridge, and overload limit load has become a pair of principal contradiction of our country's highway Bridges safety operation
As the load of the overweight vehicle is much higher than the design load of the bridge, it seriously affects the durability of the bridge structure, increases the maintenance cost of the bridge, and poses a major safety hazard to the normal operation of the bridge, which is the main reason leading to the increasing trend of bridge damage events in China year by year
The results show that the bridge in the first, second and tertiary safety limit load levels, respectively, 54.29 t, 62.54 t and 71.34 t five-axis truck as typical limit load vehicle load mode, 54.29 t, 62.54 t and 71.34 t truck side plate across five axis of bending moment is flexural bearing capacity of 58%, 57% and 57% respectively, across the plate bending moment in the flexural bearing capacity is 65%, 65% and 64% respectively, were significantly less than the bending bearing capacity, satisfies the requirement of counsels bending
Summary
With the development of society and economy, highway bridge transport vehicles in the trailer, the development of large-scale and containerization, large monomer type truck, semi-trailer train, car, vehicles, such as train using the vehicle type is increasing, has brought the serious harm to bridge, and overload limit load has become a pair of principal contradiction of our country's highway Bridges safety operation. As the load of the overweight vehicle is much higher than the design load of the bridge, it seriously affects the durability of the bridge structure, increases the maintenance cost of the bridge, and poses a major safety hazard to the normal operation of the bridge, which is the main reason leading to the increasing trend of bridge damage events in China year by year
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