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| Seismic damage evaluation of RC bridge columns based on fiber elements |
| Received:June 07, 2010 Revised:October 04, 2010 |
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| DOI：10.7511/jslx201105015 |
| KeyWord:reinforced concrete bridge columns performance based seismic design fiber element damage index cyclic loading test |
| Author | Institution |
| 艾庆华 |
石家庄铁道大学 桥梁工程教研室,石家庄 |
| 王东升 |
大连海事大学 道路与桥梁研究所,大连 |
| 向敏 |
石家庄铁道大学 桥梁工程教研室,石家庄 |
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| Abstract: |
| For the advantage of high computational accuracy, fiber beam-column elements are widely used in evaluation of displacement ductility capacity of RC bridge columns. With the development of bridge performance/displacement based seismic design, several damage indices have been suggested, such as ultimate curvature and curvature ductility factor of critical section, maximum strain of confined concrete and reinforced steels, low cycle fatigue damage indices of longitudinal reinforcement etc. To study the accuracy degree of damage indices calculated with fiber elements and the main influencing factors, stiffness-based and flexibility-based fiber elements are chosen to compute aforesaid damage indices compared with test data of RC bridge columns, with consideration of material non-linearity, geometrical non-linearity and bond-slip of anchoring steel. The study results show that the damage indices caculated by flexibility-based element are greater than those by stiffness-based element. Force-displacement curves and residual deformation calculated by both elements match the experiment with adequate accuracy. Section curvatures and tensile strain of longitudinal steel by stiffness element are colser to experimental data than those by flexibility element, but both elements underestimate section curvatures if loading displacement amplitude or shear span ratio is large. Both element overestimate tensile strain of longitudinal steel and underestimate compressive strain of concrete. |
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