Dynamic Ultimate Bahavier of Reinforced Concrete Hollow Pier under Combined Loads

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This research presents results from testing and analysis of RC hollow piers to clarify their fundamental behavior under combined loads.1.The ultimate displacement of RC hollow beams are smaller than the same-size filled beam, and the capacity of displacement and energy dissipation tend to be lower than that. At the ultimate state, the energy dissipation is about 20% inferior to the filled beam. After the hollow beam reaches the peak strength, the deterioration of its strength is rapid.2.In the flange part of a hollow section there are many flexural cracks. Once these cracks develop into the web part, they are turned into shear cracks. This phenomenon occurs not only in case of shear failure specimen but flexural failure specimen. This is why the narrow width of the web of the hollow section requires careful consideration on its shear strength, when hollow section is adopted.3.The experimental result of separation of pier displacement into flexural and shear components shows that the influence of shear is increasing when the cyclic load becomes larger even if the flexural failure dominates. This leads to the conclusion that the analysis that deals with only flexural behavior has the limitation when we analyze RC hollow piers, so the shear behavior must be considered in cojunction with flexural behavior.4.When high axial loading is used, the load-displacement curve shows that the displacement capacity tends to become worse because of the rebar buckling and the spalling of cover concrete. From this it follows that inprovement of structural details, such as increasing the shear reinforcement ratio, is important to enhance the displacement capacity of hollow piers under high axial load.