不同内填形式的带纵肋铝合金圆柱抗震性能试验研究OA

To investigate the seismic performance of aluminum alloy building columns and pedestrian bridge piers,six longitudinal ribbed aluminum alloy circular columns with a diameter of 420 mm were designed and tested under low-cycle reversed cyclic loading.The failure characteristics,hysteretic curves,skeleton curves,ductility,bearing capacity,energy dissipation capacity,and stiffness degradation of the columns were investigated.The foundation forms of the columns were reinforced concrete and steel sleeves.Their designed axial compression ratios were 0.075 and 0.15,respectively.Four infill configurations for the aluminum alloy tubes,namely hollow tube,plain concrete,reinforced concrete,and steel-reinforced concrete,were adopted.The results indicate that the failure modes of ribbed aluminum alloy circular columns mainly consist of fracture at the column base,bulging deformation,and plastic deformation of the column base section,depending on the foundation type and infill configuration.The hysteretic curves of the hollow tube specimens with reinforced concrete foundation exhibit a bow shape,while the hysteretic curves of the other five specimens are close to an S shape.The specimens with steel sleeve foundations exhibit poor bonding performance between the aluminum alloy tube and the steel sleeve foundation.When the horizontal loading displacement angle is less than 1％,specimens with steel sleeve foundations exhibit higher energy dissipation capacity than the specimens with reinforced concrete foundations.In contrast,the specimens with reinforced concrete foundations exhibit higher energy dissipation capacity after entering the elastic-plastic stage.The stiffness and horizontal bearing capacity of aluminum alloy columns with reinforced concrete foundations are about 10.8％greater than those with steel sleeve foundations,yet the ductility of reinforced concrete foundation columns is 34.7％lower.In terms of infill type,the columns with steel-reinforced concrete infill display the highest stiffness and horizontal bearing capacity,followed by the columns with reinforced concrete infill,plain concrete infill,and hollow tube.However,excessive column stiffness may lead to the foundation to fail first and a reduction in the energy dissipation capacity.