Abstract
Hashuang bridge is type of prestressed concrete box girder oblique bridge and it is located in Harbin City within Heilongjiang province in the east north of China. The objectives of this study are to investigate the appearance of the bridge structure and identify all the damages in the bridge structural members and to evaluate the structural performance of the bridge structure under dead and live loads. Finite element analysis is used to analyze the static designed internal forces and dynamic responses by adopting SAP200 software Ver. 14.2.0. Static and dynamic load test are adopted to evaluate the structural performance of the bridge structure. The results of field investigation process of the bridge appearance show that the bridge suffers from serious damages. The web of box girder of the second span near pier No.2 (in the quarter of middle span at 39m on the bridge length) suffers from serious shear cracks. The state of abutments, piers and sidewalks is good, but the bearing, drainage holes, steel rail and expansion joints are not good and they suffer from much damage. The steel rail is corroded and the expansion joint loses the material which fills the joint. There are many dusts and debris is collected on the bridge deck in the location near sidewalk. The analysis results of finite element and load tests show that there are high tensile stresses in the quarter of middle span at distance 39 m of the bridge length and the state of the bridge structure is not good and the main problem of the bridge structure in the original design of prestressed tendons. Therefore, this study recommends for repairing and strengthening the bridge structure to increase the stiffness and strength and to improve the bearing capacity of the bridge structural members to increase the service live of the bridge structure.
Highlights
The prestressed concrete systems can be defined as the preloading of a concrete structure before the application of the service loads to improve the structural performance in specific ways and it is a form of concrete in which internal stresses are introduced by means of high strength pre-strained reinforcement. (Lian, 2008; Arthur, 1987; PCI, 1968)Prestressed concrete box-girder bridges have been widely used as fiscal and visual solutions for the overcrossings, under-crossings of deep valleys to which relatively long spans are required
Prestressed concrete box girder bridge is used in many countries, but they have a crucial limitation compared to steel girders in that a single span length cannot be extended over 50 m due to its relatively heavy self-weight. (Choi et al, 2002; Meyer and Scordelis, 1971; Kwang et al, 2010)
There are two cracks incline 45° to the mid-span direction with widths are 0.5 to 2.0 mm and the widest cracks are found in the middle of web of box girder
Summary
The prestressed concrete systems can be defined as the preloading of a concrete structure before the application of the service loads to improve the structural performance in specific ways and it is a form of concrete in which internal stresses are introduced by means of high strength pre-strained reinforcement. (Lian, 2008; Arthur, 1987; PCI, 1968)Prestressed concrete box-girder bridges have been widely used as fiscal and visual solutions for the overcrossings, under-crossings of deep valleys to which relatively long spans are required. The maximum value of tensile stress is equal to 2.5 Mpa which is located in the quarter of middle span at bottom right of box girder at 39m of object 1.
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