Axial load compression experiment was conducted on 8 concrete square columns strengthened with wrapping of SGFRP(Super Glass Fiber Reinforced Polymers),aiming at recognition of the axial compression ratio of the column prior to being wrapped and the effect to what extent of the plies of SGFRP on the ultimate bearingcapacity of the columns as well as their failure modes.

Experimental investigations were conducted on the failure modes, mechanical behaviors of square concrete columns at low temperatures.

Method for calculation of skeleton curves of connections of concrete-filled steel square tubular columns with inner diaphragms;

Discussion on the types of concrete-filled steel square tubular column and steel beam joint;

Experimental research and theoretical analysis on flexural capacity of connections for concrete-filled steel square tubular columns with inner diaphragms;

Experimental study on seismic performance of vertical stiffener joints between concrete-filled square steel tubular column and steel beam;

Experimental study on load-bearing capability of connection between concrete-filled square steel tubular column and steel beam;

Tensile behavior of connection between concrete-filled square steel tubular column and steel beam;

Many researches have been researched about Rectangular concrete-filled tubular in and out our country, most focus on performance of rectangular concrete-filled tubular column and design methods.

Based on the experiment of strengthening axial compression reinforced concrete square columns wrapped with domestic carbon fiber sheet(CFS),stress-strain relation of concrete confined and factors of influencing strengthening efficiency are analyzed.