The reinforced concrete(RC)bridge columns located in saline soil area in western China are sufferring from corrosion attack,therefore,a new type of composite structure is proposed,which is herein referred to as SRPE tube-concrete-steel double-skin column.Six SRPE tube-concrete-steel double-skin stubs were tested to study their axial compressive behavior,and the failure pattern and axial load-displacement curves of specimens were obtained.The influence of pressure grade of SRPE tube,hollow rate and diameter-thickness ratio of inner steel tube on the axial compression behavior of the specimens were analyzed.The experimental results show that the failure pattern of specimen is oblique shear failure in the middle and lower part of the specimen.The ultimate bearing capacity of specimens increases with the increase of the pressure grade of SRPE pipe,and decreases with the increase of hollow ratio and diameter-thickness ratio of inner steel tube,and the influence of the hollow ratio is greater than the diameter-thickness ratio of inner steel tube.The predicted results of ultimate bearing capacity using the calculation formula proposed agree well with the mesured results.
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