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| 剪跨比对钢管混凝土组合桥墩抗震性能影响的试验研究 |
| Experimental Study on Seismic Performance of Concrete Filled Steel Tube(CFST)Composite Bridge Column with Different Shear Span Ratios |
| 投稿时间：2016-07-18 修订日期：2016-08-31 |
| DOI： |
| 中文关键词: 钢管混凝土组合桥墩 抗震性能 剪跨比 刚度退化 滞回耗能 抗剪强度 |
| 英文关键词: CFST composite piers seismic performance shear span ratio stiffness degradation hysteretic enery dissipation shear capacity |
| 基金项目:国家自然科学基金资助项目(51178080) |
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| 中文摘要: |
| 钢管混凝土组合桥墩是一种以圆钢管为钢骨的新型钢-混凝土组合桥墩,具有良好的应用前景与发展空间。为研究钢管混凝土组合桥墩的抗震性能和抗剪强度,完成了3个桥墩试件的低周反复加载试验,分析了剪跨比对试件的破坏形态、承载能力、位移延性、刚度退化、滞回耗能以及残余位移的影响。试验结果表明：剪跨比是决定组合桥墩破坏形态的关键因素,不同剪跨比试件发生的破坏模式有剪切斜压破坏、弯剪破坏和弯曲破坏三类,发生弯曲和弯剪破坏的组合桥墩具有明显优越于钢筋混凝土墩柱的耗能能力；三个组合桥墩试件的滞回曲线均比较饱满、稳定,无明显的捏缩、滑移现象；随着剪跨比的增大,墩身的强度衰减、刚度退化、变形能力和残余位移逐渐得到改善；不同剪跨比的组合桥墩均具有良好的变形能力,满足工程实践对位移延性系数和极限位移角的要求；对组合桥墩的抗剪强度计算公式进行了有益地探讨,研究成果可为组合桥墩的抗震设计提供参考。 |
| 英文摘要: |
| This paper reports a novel bridge column namely CFST composite bridge column, which was formed by embeding a steel tube into a ordinary RC bridge column. Three specimens were tested under lateral cyclic reversed loads combine with constant axial load to investigate the seismic behavior of this new bridge column. The failure patterns as well as the influence of shear span ratio on lateral load capacity, ducility, stiffness degradation, hysteretic engery dissipation and residual displacement are discussed. Tests and analytical results indicate that shear span ratio is the main factor affects the failure pattern and seismic performance of the specimens. Specimens exhibited flexural failure and flexural-shear failure behave excellent enegry dissipation capacity , whereas that of specimen with shear failure is poor. The hysteretic curves of this novel bridge column is plump, stable. The lateral load capacity, stiffness degradation , deformation capacity together with residual displacement are improved with an increment in shear span ratio. The CFST composite bridge columns with different shear span ratios match the requirement of engineering practice in ducility coefficient aspect. Relevant suggestions of volumetric stirrup ratio are put forword on the basis of the above conclusions, the research findings could provide reference for scheme selection and seismic design of bridge columns. |
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