Abstract
18 lightweight aggregate concrete (LAC) specimens confined by steel tube under axial load was tested. Different influencing factors were considered, including concrete strength, steel ratio. Influence of different parameters to the carrying capacity of LAC, the relation curves of stress-strain and the failure mode were studied. It indicates that the failure mode of the specimen changes from Drum-shaped failure to shear failure when the strength of LAC increases. And the strength and ductility behavior of LAC under the confinement of steel tube are obviously improved. The confinement effect increases when the LAC strength induces and the steel ratio increase, and it is lower than normal concrete one. The strength criterion of the LAC confined by steel tube is established according to the test results. The calculation value obtained from this strength criterion is close to test value.
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