Based on the characteristics of earthquake damage of medium-length and short RC columns subject to high axial pressure,and in consideration of the desirable properties of confined concrete such as high strength and adequate ductility,some medium-length and short RC columns are wrapped in section.

Experimental study on ductility and bearing capacity of concrete frame columns with central reinforcement under high axial compression ratio;

Through the test of concrete frame columns with central reinforcement and general concrete frame column under high axial compression ratio and cyclic lateral loading,the P-Δ hysteresis curve,stiffness degradation,viscous damping coifficients etc.

Based on the experimental study on six separated columns with high axial compression ratio and under horizontal cyclic loading, this paper analyzes the effects of axial compression ratio and stirrup reinforcement ratio on the seismic behavior of the separated columns, including rigidity, cracking, maximum bearing capacity, failure features and hysteresis curve etc.

According to the result of slaking test,the character of coarse aggregate slaking deformation is presented under triaxial stress condition,and the shear strength of coarse aggregate slaking test is discussed,by comparing the result of slaking test with the data of large triaxial test under high pressure.

The paper tests and studies the mechanical character of this new type of dam by using high-pressure triaxial apparatus.