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| Study on ultimate bearing capacity of dumbbell shaped concrete filled steel tubular arch rib |
| Received:November 18, 2013 Revised:December 06, 2013 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201501017 |
| KeyWord:CFST arch rib ultimate bearing capacity unified strength theory equivalent beam-column method numerical simulation analysis |
| Author | Institution |
| 李艳 |
长安大学 建筑工程学院, 西安 |
| 赵均海 |
长安大学 建筑工程学院, 西安 |
| 张常光 |
长安大学 建筑工程学院, 西安 |
| 梁文彪 |
中联西北工程设计研究院, 西安 |
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| Abstract: |
| To study the mechanical properties of dumbbell shaped concrete filled steel tubular(CFST) arch rib,a new formula of ultimate bearing capacity was deduced according to unified strength theory and equivalent beam-column method,considering the impacts of the intermediate principal stress and tension-compression ratio of materials.Additionally,the finite element model of dumbbell shaped CFST arch rib was established by using beam element and the whole loading progress was analyzed with consideration of both geometrical and material nonlinearities.Through comparing the theoretical analysis results and numerical simulation ones with those of experiments in the related literature,the validity of the method is proved.Moreover,influencing characteristics of such factors as load cases,slenderness ratio,rise-span ratio,section types and concrete filled in web space were studied by using finite element method.The results show that:the load cases have significant influence on the ultimate bearing capacity of dumbbell shaped CFST arch rib;the more symmetric and uniform the load is,the higher the bearing capacity is,the smaller the vertical displacement is.The ultimate bearing capacity of arch ribs decreases significantly with the rise of slenderness ratio,and increases at first and then decreases slightly with the growth of rise-span ratio.The section types have great impact on both strength and stiffness of arch ribs,while the concrete in web space has little effect. |
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