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| Study on the nonlinear simulation of prestressed concrete bridge |
| Received:September 22, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20105025 |
| KeyWord:prestressed concrete bridge concrete creep ultimate load capacity degenerated solid method nonlinear simulation |
| Author | Institution |
| 汪劲丰 |
浙江大学 建筑工程学院,杭州 |
| 吴光宇 |
南昌大学 建筑工程学院,南昌 |
| 项贻强 |
浙江大学 建筑工程学院,杭州 |
| 叶贵如 |
浙江大学 建筑工程学院,杭州 |
| 凌道盛 |
浙江大学 建筑工程学院,杭州 |
| 徐兴 |
浙江大学 建筑工程学院,杭州 |
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| Abstract: |
| For modern P.C. bridge’s complex stress state and nonlinear effect, a nonlinear simulation method was theoretically explored. With introducing the beam and shell theory into the solid isoparatmetric element, a new type of element, degenerated solid element was proposed for the exact modeling of the complex concrete bridge. Based on the mechanism of prestressed bar’s action, a two-stage method was advanced to simulate the prestressing. A three-parameter visco-elasticity model was employed to simulate the concrete creep, and a series of recursion formulas were derived to analyze the effect of three-dimensional concrete creep. For the calculation of concrete crack and ultimate load capacity, some key issues, such as geometric nonlinear, material nonlinear and numeric algorithm were particularly discussed. And then three numerical examples were respectively used to validate the methods for the analysis of prestressing, creep and ultimate load capacity. The result shows that the technique discussed above can objectively simulate the structure, truly assess the effect of prestressing and creep, and well predict the concrete crack and ultimate load capacity of the bridge. It has a wide application on the bridge engineering. |
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