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| Nonlinear analysis of steel tube initial stress effect in stell tube on bearing capacity for CFST arch bridges |
| Received:June 17, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20102019 |
| KeyWord:CFST(Concrete Filled Steel Tubular) arch bridge initial stress steel tube Influence factor of bearing capacity solid-spatial beam element combined spatial beam element practical formulas |
| Author | Institution |
| 周水兴 |
重庆交通大学 土木建筑学院, 重庆 |
| 张敏 |
重庆交通大学 土木建筑学院, 重庆 |
| 王小松 |
重庆交通大学 土木建筑学院, 重庆 |
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| Abstract: |
| Based on equilibrium equation of nonlinear problem and nonlinear geometric equation of spatial beam element,explicit formula of tangent stiffness matrix for spatial beam element was deduced, its constitutive relationship includes the initial stress and initial strain. According to structure character of dumbbell section, a combined spatial beam element is presented for computing and storing steel tube initial stress. Method of element division was described about bearing capacity analysis for concrete filled steel tubular (CFST) arch bridge. A special program was developed. The results calculated by program were in accordance with tests. A lot of bearing capacity calculation are performed,with regard to different coefficients of initial stress steel tube, different sectional steel ratios and different spans. Results show that initial stress of steel tube could reduce the capacity of CFST arch bridge, the reduction extent depends on the sectional type of arch rib, and the maximum reduction can exceed 30%. Finally, practical formulas of bearing capacity influence factor are given for the CFST arch bridge with three common sectional types. |
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