Investigation On Bearing Capacity Of Square Steel Tube Columns Filled With Steel-reinforced Concrete Subjected To Eccentric Compression

With contemporary engineering structures to the large cross, towering reload direction inrecent years, square steel tubes-steel reinforced concrete column gradually been applied inhigh-rise buildings, the systematic study of the performance of its force on guidance suchstructure design has important practical value. In this paper, a combination of theoreticalanalysis and numerical simulation research methods, the failure mechanism of the classmembers under eccentric loads, the bearing capacity factors and force studying the pattern,the specific content and conclusions are as follows:Unified strength theory of Intermediate Principal Stress and tension compressionheterosexual component capacity, taking into account the role of steel pipe concreteconstraints considered in the axial compression on the basis of eccentricity and slendernessratio of the bearing capacity, introduced considering the thick edge than the equivalent theconstraint reduction factor and concrete strength reduction factor, draw a square steeltubes-the ultimate bearing capacity of steel reinforced concrete column bias formula. Thecalculation results with the literature results contrast we can see a smaller error, verify thecorrectness of the theoretical formula of this article.Analytical steel-steel reinforced concrete column bias bearing capacity influencingfactors, in the case of square steel tubes-steel reinforced concrete column foreign steel pipecross-sectional dimension remains unchanged, the bias bearing capacity increases with thecross-sectional dimensions of the steel to improve; bias capacity is reduced with theeccentricity of the calculated length increases; With, b increases. In the case of the same steelcross-sectional area, square steel tube-bias bearing capacity of steel reinforced concretecolumn increases with increasing concrete strength, but ordinary concrete increased by more;With square pipe wall thickness increase in bias bearing capacity increases.Simplify the square steel tubes-steel reinforced concrete column bias bearing capacityformula is derived, square steel tubular column bias bearing capacity formula, will simplifythe square steel tubular column bias bearing capacity formula is further simplified to obtainthe bias bearing capacity of concrete filled steel tube column formula, the formula to calculatethe ultimate bearing capacity compared with the literature with experimental data, the resultsare in good agreement, indicating that the derived formula has greater versatility, the practicalapplication of the engineering a theoretical basis.The use of large general-purpose finite element software ANSYS, other steel pipes-steel reinforced concrete column three-dimensional simulation, analysis of square steel tube-theperformance of steel reinforced concrete column under the bias of the force, the failuremechanism and ultimate bearing capacity, with the test results and this derivation The formulato calculate the results of comparison, in good agreement. While the load-displacement curve,square steel tubes-steel reinforced concrete column better ductility.