| In order to further study the seismic behavior of a new type of RCS composite structure that is composed by high strength concrete column with but-welded close compound stirrups, hexagonal hole honeycombed steel beam and concrete slab including profiled steel sheet, the article shows 9 quasi static test of 1/2 scale beam-column sub-assemblies connected by extended end-plate under horizontal low-cyclic loading. Through each stage in the process of loading test phenomenon description, a variety of deformation measurement analysis, researching the bending deformation of column and steel beam, the shear deformation of steel beam and beam-column joint core, relative deformation between the fitting and so on, the article put forward the suggested distortion permissible value that meet the requirements of different performance and determine the structure failure modes.Besides the hysteretic curves, skeleton curves, ductility, energy dissipation capacity, stiffness degradation and strength degradation of specimens were also analyzed. At the same time, through analysis with the result of finite element calculation, the article determined the hysteresis rules and suggested empirical formula on solving the skeleton curve, a restoring force model is proposed which considered the effect of initial stiffness and ductility coefficient.The test results showed that: All specimens formed plastic hinges at the steel beam, exhibiting excellent ductility and energy-dissipating capacity, that the performance of reinforced concrete column and beam-column joint core were in good condition, to achieve the seismic design requirements on "Strong Column Weak Beam, Strong Node Weak Component"; the article put forward a seismic design parameter which can be used as a quantitative analysis based on data statistics,namely the interlayer displacement Angle of 1/250, 1/65, 1/45, 1/25 correspond to four stages deformation permissible performance level of the structure in turn,including basic intact, slightly damaged, moderate damage, and severe damage(avoid collapse); The specimens with floor are of stronger initial stiffness and bearing capacity, better deformation and energy dissipation capacity; By comparison, with theimprovement of steel beam section stiffness, the specimens’ bearing capacity is relatively stronger, but with worse ductility;The joint construction of which use end-plate to connect steel beam with column behave good, so it is reasonable and reliable; In the composition of the total displacement, the deformation of steel beam is the highest, the rest of the deformation caused by other deformation is relatively low;The suggested skeleton curves are already indicated well with the actual skeleton curves from test, so the recommended restoring force model can be used as the similar structural elastic-plastic seismic response analysis and reference for related research. |
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