Abstract
The actual bearing capacity of a bridge in active service is crucial to the structure, but such data is generally difficult to obtain. In order to obtain the actual ultimate bending capacity of the used hollow slab, a destructive test of a hollow slab, which has been used ten years, has been carried out. Moreover, based on the experimental analysis of the material parameter data, a three-dimensional finite element nonlinear analysis model of the used hollow slab was established. Through the experiment and finite element analysis of the used hollow slab, the comparisons of the failure mode, crack propagating and ultimate bending capacity were focused on. The main conclusions obtained through the study are as follows: (1) Strand is a kind of stable prestressed material, which can maintain good mechanical properties for a long time; (2) The used hollow slab still maintains good ultimate bending capacity, although underwent a decreased rigidity due to long-term cumulative damage; (3) The total strain fracture model is qualified for simulating the nonlinearity of concrete material, and can obtain the ultimate bearing capacity of reinforced concrete structure effectively as well as simulates the development of cracks well.
Highlights
Hollow slab is one of the most commonly used forms of reinforced concrete bridges and prestressed concrete bridges in small span of 10 ~ 20 m
Hollow slab bridge is supported beam bridge, which is suitable for mass production in factory and assembly-type construction
The results showed that the actual bearing capacity of the bridge was much higher than the theoretical value
Summary
Hollow slab is one of the most commonly used forms of reinforced concrete bridges and prestressed concrete bridges in small span of 10 ~ 20 m. A prestressed concrete hollow slab beam bridge was used for full-scaled destructive test by FM Wang et al[4]. The influence of actual carrying capacity of hollow slabs has not been the subject of comprehensive analysis. For this reason, research was undertaken by the authors, and described below. In order to obtain the actual ultimate bending capacity of the used hollow slab, a destructive test of a hollow slab, which has been used ten years, has been carried out. Through the experiment and finite element analysis of the used hollow slab, the comparison of the failure mode, crack propagation and ultimate bending capacity was focused on. Conclusions regarding carrying capacity of hollow slabs were proposed
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