AI Article Synopsis
- Continuous rigid-frame bridges experience significant mid-span deflection during operation, which is often addressed by implementing pre-camber in their design.
- In this study, researchers analyzed 18 finite element models based on design parameters, revealing shrinkage and creep of concrete as the primary contributors to mid-span deflection, while prestress loss had a secondary effect.
- The authors developed a fitting formula for calculating pre-camber, confirming its accuracy through comparisons with existing specifications and empirical data.
Article Abstract
Continuous rigid-frame bridges are widely used, but the large deflection in the mid-span during operation has always been their disease. This problem is generally solved by setting the finished bridge pre-camber. There are many calculation methods for pre-camber, and the effects are different. In this paper, based on a large number of design parameters of continuous rigid-frame bridges obtained from the investigation, 18 finite element analysis models of different span combinations were established, and 30 sets of valid data were obtained under the action of multi-factor. The results show that the shrinkage and creep of concrete is the most important factor for the mid-span deflection of continuous rigid frame bridges, and the deflection amount has an obvious functional relationship with the span. The effect of prestress loss on mid-span deflection is second, and stiffness reduction has little effect on mid-span long-term deflection. In this paper, the least-squares method is used to perform polynomial fitting, and the fitting formula for the mid-span finished bridge pre-camber is finally obtained. The applicability of the calculation formula is proved by comparing it with the specification solution, the empirical solution, and the measured value.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9513072 | PMC |
| http://dx.doi.org/10.1038/s41598-022-20449-4 | DOI Listing |
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