Study On The Seismic Performance Of SRC-RC Transfer Column

In recent years, SRC-RC vertical hybrid structure has been used in more and more high-rise buildings at home and abroad especially in Japan. The key part of this new type of steel-concrete composite structure is the transmission story which is the lower SRC structure upward transition of the upper RC structure. The transmission story easily lead to stiffness and strength mutations and engenders the weak story under it's inappropriately design, and its deformation easy to resulted in serious damage to the overall structure of the destruction.The key of the design of SRC-RC vertical hybrid structure is the seismic design of transmission story. At present, the method of the seismic design of transmission story mainly have the whole story transitional law and the interlayer transitional law at home and abroad. Japan's early SRC-RC vertical hybrid structures adoption of the whole story transitional law have been occurred varying degrees of damage under the previous earthquake. Then Japan expand a series of experimental study and theoretical analysis, and found the interlayer transitional law under the use of reasonable transit forms and detailing measures has a relatively better seismic performance and mechanical properties, and apply the latter SRC-RC vertical hybrid structure. In recent years, our country has built a number of SRC-RC vertical hybrid structures, but the two industry-standards both sue of the whole story transitional law, and on the work of the SRC-RC vertical hybrid structure has hardly begun, is relatively backward in engineering applications.Failure patterns, hysteretic curves, skeleton curves, energy dissipation, strength degeneration and ductile coefficients of SRC-RC transfer columns of the key member of the transmission story are obtained by tests of 12 SRC-RC transfer columns under low cyclic reversed loading. Based on the test results, the influences of anchoring length of shape steel, axial compression ratio, steel ratio and stirrup ratio on the seismic performance of SRC-RC transfer columns are analyzed.Based on the test results, the influences of anchoring length of shape steel, axial compression ratio, steel ratio and stirrup ratio on the shear strength are discussed and the mechanism of shear-resistant of specimens is inquired. The practical formula of shear strength of SRC-RC transfer columns is put forward.Finally, based on the experimental study and theoretical analysis, some design and calculation recommendations are suggested, and the problem needs further improved and solved are proposed.