基于试验数据的内置圆钢管混凝土方形叠合短柱轴压强度计算方法比较

COMPARISON OF CALCULATION METHODS ON BEARING CAPACITY OF CONCRETE-FILLED STEEL TUBE REINFORCED CONCRETE COLUMNS SUBJECTED TO AXIAL-COMPRESSION BASED ON EXPERIMENTAL DATA

搜集了国内学者所做的71根钢管混凝土叠合柱轴压短柱的试验数据,建立了钢管混凝土叠合柱轴压试件的数据库,并进行了相关参数的统计分析。介绍了5种叠合柱轴压强度计算方法,并将试验结果与计算式预测结果进行比较,分析了各计算式对于叠合柱轴压强度计算时的适用性。结果表明:CECS 188∶20××《钢管混凝土叠合柱结构技术规程》(送审稿)计算式和《钢管混凝土叠合柱轴压性能研究》一文中计算式的预测结果与试验结果较为接近。最后,基于现有试验数据,分析了叠合柱中外围钢筋混凝土中箍筋的配箍特征值与内部钢管混凝土的约束效应系数比值对轴压强度的影响规律。

The test data of 71 concrete filled steel tube reinforced concrete stub columns subjected to axial compression were collected in the paper,and a database of the type of axially-loaded stub composite column was established.A statistical analysis of the relevant parameters was performed.Five calculation methods on predicting the bearing capacities of concrete filled steel tube reinforced concrete columns subjected to axial compression were introduced respectively,and the calculating results were compared with those of tests.The analytical results demonstrated that Technical Specification for Steel Tube-Reinforced Concrete Column Structures(draft submitted for approval)(CECS 188∶20××)and the paper Behaviour of Concrete-Filled Steel Tube Reinforce Concrete Columns Subjected to Axial Compression could reasonably evaluate the bearing capacity of the axially-loaded concrete filled steel tube reinforced concrete stub column.Based on these experimental data,the influence rule of the ratio of stirrup constraint index in outer concrete to the constraint effect coefficient in inner concrete filled steel tube on bearing capacity was discussed.