Research on the seismic performance of high-strength square steel tube ultra-high performance concrete columns
In order to study the seismic performance of ultra-high performance concrete filled high-strength square steel tube(UHPCFHST)columns,this paper uses the hoop factor,length-to-slender ratio,and axial compression ratio as the parameters of study to conduct the low cyclic reversed loading test.The damage patterns of the specimens were observed,and the influence of each parameter on the hysteretic properties,stiffness,ductility and energy dissipation capacity of the specimens was analyzed.The test results show that the damage characteristics of all specimens are similar,and the phenomena of steel pipe buckling and concrete crushing appear at the bottom of the column.With the increase of the hoop coefficient(from 0.55 to 0.98),the ductility of the specimens increased by 8.91%and 21.52%,respectively.The initial stiffness,horizontal bearing capacity and ductility of the specimens decrease with the increase of the length-to-slender ratio,and the greater the length-to-slender ratio,the more significant the weakening of the ductility of the specimens.When the axial compression ratio increases from 0.1 to 0.2,the initial stiffness and horizontal bearing capacity of the specimen increase,while the ductility decreases.At the same time,the load-bearing capacity test results in this paper and the calculated values of each specification are compared and analyzed.The calculation results of the United States ANSI/AISC 360-16 AISC specification for structural steel buildings are lower than the measured values by 48%,which is relatively conservative.The calculation results of the GB 50936-2014 technical code for cencrete filled steel tubular structures are higher than the measured values by 17%,After analyzing the Fujian provincial local standard DBT/T13-51-2010 technical specification for concrete-filled steel tube structures,the calculation is the most consistent with the actual measurement,which provides a reference basis for the design of high-strength square steel pipe ultra-high-performance concrete columns under low cyclic reversed loading.
high strength square steel tubeultra-high performance concretepseudo-static testseismic performancebearing capacity
万方数据
维普
