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Huang P.,Hunan University | He Y.,Hunan University | Guo J.,Hunan University | He K.,Hunan University | And 3 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

The rotation of end-plate connections for composite steel and concrete structures was divieded into two parts, one is shear deformation of joint, the other is deformation of the connected component,and the later was decomposed into the bending deformation of end-plate and elongation transformaton of the high strength bolt. By calculating the moment-shear deformation curve, moment-end-plate rotation curve and moment-bolt rotation curve respectively, the total moment-rotation curve was obtained by adding individual responses based on superposition principle. The results show that the theoretical calculation curve is in good agreement with that of the experiment. The method can calculate the moment-rotation precisely in the range of initial stage and completely satisfies the structural design requirements. The calculation procedure is simple and more efficient for engineering applications, and provides reference to related specifications and codes.

He Y.,Hunan University | Huang P.,Hunan University | Guo J.,Hunan University | Zhou H.,Hunan University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

In order to investigate the seismic behavior of steel beam to steel-reinforced concrete filled square steel tubular column connections, five specimens were tested by quasi-static tests. The influences of end-plate thickness, bolt diameter, concrete strength and axial compression ratio on the load-carrying capacity, moment-rotation curve, energy dissipation capacity, load degradation, rigidity degradation, ductility and ultimate failure modes of end-plate connections were analyzed. The experimental results show that these new type of composite connections belong to the category of semi-rigid connections, and the initial rotational stiffness of connections increase with end-plate thickness and bolt diameter, but the utmost rotational capacity of connections decrease with end-plate thickness. The connection shows excellent behavior in terms of ductility and energy dissipation when the strength of connection is controlled by end-plate or steel beam. The load degradation coefficients of all specimens are between 0.8 and 1.0, varying within a narrow range. Compared with load degradation, the rigidity of specimens degrades seriously. Moreover, the high strength bolt should avoid brittle failure in the design procedure.

He Y.-B.,Hunan University | Xiao A.-L.,Hunan University | Guo J.,Hunan University | Zhou H.-B.,Hunan University | Zhou H.-B.,Hunan Construction Engineering Group
Journal of Natural Disasters | Year: 2010

Column composed of structural steel and concrete - filled steel tube is a new type of heavyload - carrying composite column. An experimental study on the mechanical properties of the composite column, in which effect of supporting condition has been taken into account, was conducted for 9 short composite columns for the first time. The effect of the confinement coefficient, the structural steel index and concrete strength on the mechanical properties of the composite column was discussed, and formulas for predicting the ultimate bearing capacity of the composite column were proposed. The results calculated by the proposed formulas are in good agreement with the test results. The results show that composite column has very high strength and ductility because of the interaction between the steel tube, structual steel and core concrete, so the composite column can effectively improve the collapse resistant capacity of building.

He Y.,Hunan University | Li Y.,Hunan University | Guo J.,Hunan University | Zhou H.,Hunan University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

The results of an experimental research involving the testing of six bolted moment-resisting connections under simulated seismic loading conditions were presented. The test specimens modeled the interior joint of a moment-resisting frame consisting of concrete-filled double skin tubular column and H-shape steel beams with reinforced concrete slab using high-strength bolts and T-stub connectors. To investigate the seismic behavior of the composite joints, the failure modes, hysteretic performance, shear strength, bearing capacity degradation, rigidity degradation, energy dissipation and strain were evaluated in detail. The test parameters varied including the axial load level on the column, the stiffener, the size of T-stub, the thickness of slab and the reinforcement ratio in slab. The experimental results indicate that the compressive capacity in column and the shearing capacity in joint are improved by the inserted tube. In some extent, the increase of reinforcement ratio in slab (1%≤ρ≤ρ max) and the decrease of the loading level on the column (n≤0.3) will improve the total energy dissipation and reduce the ductility of joint, without obvious influence on the joint the bearing capacity. The seismic behavior of joint will be affected by the thickness of T-stub flange and the stiffener.

He Y.,Hunan University | Xiao A.,Hunan University | Guo J.,Hunan University | Zhou H.,Hunan University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2010

In order to study the behavior of eccentrically loaded steel-reinforced self-compacting high-strength concrete filled steel tubular columns, tests on thirteen composite column specimens subjected to eccentric compression were carried out. Load-deformation curves, macroscopical characteristics of deformation, as well as failure modes of the composite column were studied. The effects of the eccentricity ratio, slenderness ratio, confinement coefficient and structural steel index on the mechanical properties of the composite column were discussed. The results show that the propagation of cracks in core concrete can be put-off or avoided by the inserted structural steel, so the ultimate bearing capacity and ductility of the composite column is effectively improved. In the whole loading process, the steel tube longitudinal strain distribution along the depth of cross-section approximately follow the plain section assumption, and the deflection curve of eccentrically loaded slender columns is basically in accordance with half-sine-wave curve. The ultimate capacity of the composite column decreases with load eccentricity ratios and slenderness ratio increasing, increases with structural steel index increasing.

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