Abstract
This paper experimentally analyzes the working behavior characteristics of a large-curvature continuous prestressed concrete box-girder (CPCBG) bridge model based on structural stressing state theory. First, the measured strain data is modeled as generalized strain energy density (GSED) to characterize the stressing state of the bridge model. Then, the Mann-Kendall (M-K) criterion is adopted to detect the stressing state leaps of the bridge model according to the natural law from quantitative change to qualitative change of a system, which derives the new definition of structural failure load. Correspondingly, the stressing state modes for the bridge model’s sections and internal forces are proposed to verify their changing characteristics and the coordinate working behavior around the characteristic loads. The analytical results reveal the working behavior characteristics of the bridge mode unseen in traditional structural analysis, which provides a new angle of view to conduct structural analysis and a reference to the improvement of design codes.
Highlights
In recent years, the continuous curved girder bridge has been increasingly favored by engineers due to its economic, aesthetic and increasing need of urban overpass construction
This paper experimentally investigates the whole working process of a large curvature continuous prestressed concrete box-girder (CPCBG) bridge model, based on the new concept of structural stressing state and the corresponding analytical method, aiming at revealing some unseen stressing state characteristics in the experimental data
The definition of the bridge model’s failure load is updated at load Q, which could further lead to the update of the relative design codes
Summary
The continuous curved girder bridge has been increasingly favored by engineers due to its economic, aesthetic and increasing need of urban overpass construction. J. Shi et al Stressing state analysis of large curvature continuous prestressed concrete box-girder bridge model more complicated and would produce some adverse effects (Walter, 1985). The existing analytical theories and methods are difficult to achieve an accurate prediction of structural load-bearing capacity, in view of the complex stressing state of curved bridge structures with prestress. The semi-empirical and semi-theoretical methods for determining the ultimate bearing capacity of the bridge structures are to avoid and minimize the negative effects derived by the inaccurate prediction. This paper experimentally investigates the whole working process of a large curvature CPCBG bridge model, based on the new concept of structural stressing state and the corresponding analytical method, aiming at revealing some unseen stressing state characteristics in the experimental data
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