Study On Eccentric Compression Behavior Of H Steel PEC Column In Weak Axis

H steel partially encased concrete composite column is a configuration consisting ofwelded H-shaped steel section with concrete cast between the flanges. Transverse linksbetween the flanges tend to provide some confinement to the concrete. Concrete castbetween the flanges can effectively improve the resistance to local buckling. In order toapply this new component to practical engineering, the eccentric compression properties ofH type steel encased concrete composite short column in weak axis were studied.In this paper, eccentricity compression test on7welding H steel partially encasedconcrete composite column in weak axis were studied, mainly considering the effect offlange width thickness ratio and load eccentricity. The failure mode and ultimate bearingcapacity of H steel partially encased concrete composite column were analyzed. Theinfluence of eccentricity and flange width thickness ratio on the middle deflection and thelongitudinal displacement of the specimens were researched; Eccentric compression testspecimen failure mode and load-longitudinal strain curves in strong and weak axis wereanalyzed; Finite element analysis software was used to expand influence of the concretestrength on the bearing capacity and deformation of the short column.The analysis results show that the final failure mode of composite short column inweak axis is the crushing of the concrete in the compression zone and concrete tensilecracks and the flange between horizontal bars occurs local buckling. After reachingultimate bearing capacity, while the concrete protective layer falls off, but as a result ofmutual restraint of lateral bracing, flange and web of column on the core concrete,specimens will still be able to continue to bear the load, and have good late deformationability and stability bearing capacity. The bearing capacity of partially encased concretecomposite short column in weak axis eccentrically load has improved with decreasing ofthe steel flange width thickness ratio. When the width thickness ratio of the flange isreduced from16.7to12.5, the ultimate bearing capacity of the specimen increased by21.91%, and when the width thickness ratio of the specimen was reduced from12.5to10, the ultimate load of the specimen increased by16.02%. With the increase of eccentricity,the bearing capacity of the short PEC column is decreased. The eccentric distanceincreased from40mm to60mm,24.58%increased in ultimate bearing capacity. Thatincreased from60mm to80mm, the ultimate bearing capacity increased by9.82%. Finiteelement analysis results show that when the steel content is same and the concrete strengthexceeds C40or above, concrete strength has little effect on the bearing capacity of theweak axial eccentric compression of PEC column. The relationship between the concretestrength and the steel content of the specimen is recommended to further study.