ABSTRACT
Manufacture of structures for full-scale testing have been carried out in factories of building structures. Usually the composite members were produced here firstly consisting of steel tubes of different outer diameters (0219 and 0325 mm), as external shells, and internal hollow concrete cores. For external shells were used either the standard commercial thin-walled (with thickness from 3,5 up to 8 mm) spirally welded steel tubes or supper thin-walled (with thickness from 1,5 up to 3,0 mm) spirally shop welded by arc plasmatic way ones. Usual type of cross-sections of composite members is shown on Figure 1. The formation of hollow concrete cores have been produced on special centrifuges, supplied for spinning of tubes with rubber belts or rollers. The concrete mix is filled into the circular steel tube being as tubular form. During centrifuging the concrete mix become compacted and received a hollow circular tubular cross-section shape. Because of such compaction and removal of redundant water the strength of hollow concrete core becomes near twice higher than of the initial concrete.
