Experimental Study On Seismic Behavior Of HRB500 Reinforced Concrete Columns

Reinforcement and concrete can work together Because of good bonding each other.In order to ensure that each bar can be wrapped in concrete can be effectively maintain the bond anchorage effect between steel and concrete,In our current concrete structure design specifications and construction standards, the regulations must maintain a certain distance between the reinforced.To reduce the weight of the structure in engineering practice, it requires component sectional area to minimize during design time,reinforced dense often appears on the section so that it is hard to meet the spacing requirements of the current design and construction specifications,This is particularly in the use of high strength concrete, the most economic and convenient solution in engineering is to adopt bundled bars.Reinforced by a single changes to the bundled bars,and its occurrence changes on bond-anchorage performance,which affects the mechanical behavior of component.In the 《 Design of Concrete Structures 》(GB50010-2010) was added in bundled bars structural requirements, but not to make clear that the issues of bearing capacity and the stiffness of component which adopt bundled bars.In this paper, the seismic performance of specimen column are analyzed through the horizontal low cyclic loading test.Trough the horizontal low cyclic loading test on three bundled bars columns with HRB500 steel bar, obtain specimens column load- displacement hysteretic curves,skeleton curves, the column bottom moment- curvature curves, the displacement ductility ratio, energy dissipation coefficient of specimens were calculated, analyzed the impact the number of bundled bars on the seismic behavior of columns. The results showed that: the single steel specimen seismic performance is better, seismic performance of the specimen with lashing double reinforcement was slightly better than the specimen of lashing three reinforcement. Three specimens longitudinal tensile reinforcement were yielded when the specimens reaches the maximum bearing capacity.Thus, during the column horizontal cyclic loading test, tensile strength of configuring HRB500 longitudinal reinforcement strength were fully utilized utilized.