SEISMIC BEHAVIOR RESEARCH OF STEEL PLATE HOOP-BOLT PREFABRICATED COLUMN CONFINED BY HIGH-STRENGTH COMPOSITE SPIRAL STIRRUPS

In order to study the seismic behavior of steel plate hoop-bolt prefabricated column by high-strength composite spiral stirrups，the low cyclic loading tests were carried out． Four long column specimens were designed． Cracking，yield，destroyed process and destroyed state of specimens were observed in the tests，and the loaddisplacement hysteretic curves and skeleton curves of each specimen were also obtained． Comparative study on carrying capacity，ductility and energy dissipation capacity of each specimen was conducted，and analysis of the reliability of steel plate hoop-bolt connection was done． The test proves that steel plate hoop-bolt prefabricated column confined by high-strength composite spiral stirrups has about the same bearing capacity and seismic capacity as compared with cast-in-place column，and the prefabricated column can be used to replace the cast-in-place column in project in case of secure connections．