As a kind of SRC, the high-strength concrete filled steel tube reinforced concrete (CFSTRC), which shows an alluring applying prospect, is endowed with better mechanical property than the common SRC structure, due to the confined concrete by steel tube.

Nine low cyclic loading tests on concrete columns with high strength core were carried out in terms of the axial compression ratio and the area of core high strength concrete.

Introduction on experimental method of drilling core checking compressive strength of centrifugal high-strength concrete (national standard GB/T 19496-2004);

The research of the core concrete s empty which influences the mechanics performance of concrete filled steel tube components is a hot issue currently.

It is an important approach for improving carrying capacity of steel tube-confined concrete to improve strength of core concrete.

To develop the design and computational theory for FRP reinforced concrete structure and provide theoretical basis for its application, considering three typical service stages, axial stress expressions of GFRP tubes and concrete core were derived based on classical laminate theory and equilibrium of forces.

Expansion rule of concrete core in self stress lightweight concrete filled steel tube,relationship between self stress and steel content ratio,and super performance of self stress lightweight concrete filled steel tube are gained through comparison test;damage process of short columns under axial load is analyzed.