Experimental Study of Self-stressing and Static Load on Self-compacting Concrete Filled Steel Tubular

摘要

In order to achieve the optimal interface composite properties between the inner wall of steel tube and the core concrete as well as evaluate the expansion properties of concrete filled steel tubular rationally, the mechanical properties of 5 CFST specimens were tested in this paper with different dosage of expanding agent measured from zero to 28d curing age. Besides, this research also examined the validity and accuracy of homemade concrete stress box. The result proved that the test results coincide with the calculated value of theoretical analysis perfectly, which provided experimental and theoretical basis for the expansion mechanism of self-stressing concrete in steel tube constraint and the designing goals of expansion properties in concrete filled steel tubular.