| At this stage, shaped column from the application point of view, consists of: T-shaped columns, L-shaped column, cross-shaped column and Z column. The first among the three column, has carried out regular cross-section shaped column elements, diagonal section, axial compression ratio, ductility, and seismic performance of frame joint research, made a large number of research results, but the Z-shaped columns The study also relatively poor. Shaped column structure in the system, Z-shaped columns can be used as column grid conversion when axes shifted column. In practical engineering functions to meet the needs of architecture, Z-shaped columns have been widely used in the designer. However, in 2006 promulgated the "Technical Specification for Structural Concrete Columns"(JGJ 149-2006) is not included in the Z-shaped columns, so that when the design is not science in the design of reference. In view of this, the proposed Z-Compression Performance of Axial.Z-shaped columns for current research, this study in a certain range of transverse reinforcement characteristic values, Z-shaped design of the seven columns, three rectangular column specimens, through the performance of axial compression tests, obtained the following results:Z-shaped columns mainly to the destruction of the main diagonal shear compression failure, when the stirrup is easy to form relatively small value through joint, shear compression failure occurs, when the stirrup is large, component of the shear compression failure when crushed Protective layer of concrete is more obvious, destroyed most of the longitudinal reinforcement component yield, stirrups not pull off.The stirrup component values of that component stirrup higher the value, the greater the bearing capacity and deformation, the role of stirrups on the concrete, the stronger the constraints on the two groups of 10 test results of specimens Obtained with Z-shaped column reinforcement characteristic values and the strain coefficient of variation of ductility, by calculation, the value component of the stirrup is between 0.09 to 0.4, the components range between 1.15 to 2.35.According to data analysis, the establishment of a Z-shaped columns confined concrete increases the value of the relative peak intensity and peak strain increase the value of the relative value of the stirrup relational expression, with the concrete increases the value of stirrup, Z-shaped columns Increase the value of the relative strength of confined concrete increase is small and basically similar.The stress-strain test data for research, establish a Z-shaped columns confined concrete stress-strain curve equation. The concrete compressive strength and the value of the same stirrup members, stirrup diameter, strength and spacing of different stress-strain curve of confined concrete is basically the same, the bearing capacity and ductility characteristics of components are basically the same; concrete larger the stirrup, The confined concrete peak stress and deformation of the greater role of stirrups on the concrete, the stronger the constraints.Through analyzes the Z shape column's stress process, has established under the Z shape column axle center bearing the supporting capacity formula and the reduction formula. Indicated that the formula predicted value is lower than the experimental value, the computed result is in favor of a security. And using the ANSYS finite element software, carries on the modelling according to the Z shape column's actual size, simulates the Z shape column's actual bearing situation, obtains the Z shape column's limit supporting capacity simulation value, is closer with the experimental value, has certain reliability, and proved pushes the formula is quite reasonable, has provided certain reference to the engineers and technicians and the structural design personnel Z shape column design, simultaneously has also enriched the present stage to the reinforced concrete Z shape section column's fundamental research. |
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