徐亚丰++金松++夏世强++毕洋洋

摘要：为研究钢骨方钢管高强混凝土组合柱小偏心受压力學性能，采用有限元软件ABAQUS对钢骨方钢管高强混凝土组合柱小偏心受压试件进行非线性有限元分析，研究了长细比、偏心率、配骨指标和加载方向这些参数对组合柱小偏心受压力学性能的影响。通过回归分析提出小偏心受压承载力简化计算公式，并将简化公式计算结果与试验结果及有限元（FEM）计算结果进行对比。结果表明：长细比、偏心率对组合柱小偏心受压承载力影响较显著；配骨指标的增大能提高组合柱的延性；加载方向对承载力影响很小；简化公式计算结果与试验结果及有限元计算结果吻合良好。

关键词：小偏心受压；有限元分析；钢骨方钢管高强混凝土组合柱；承载力；延性

中图分类号：TU398.9文献标志码：A

Mechanical Properties of Square Steel Tube Filled with Steelreinforced

Highstrength Concrete Composite Columns Under Small

Eccentric CompressionXU Yafeng， JIN Song， XIA Shiqiang， BI Yangyang

（School of Civil Engineering， Shenyang Jianzhu University， Shenyang 110168， Liaoning， China）Abstract： In order to investigate mechanical properties of square steel tube filled with steelreinforced highstrength concrete composite columns subjected to small eccentric compression， nonlinear finite element analysis of square steel tube filled with steelreinforced highstrength concrete composite columns under small eccentric compression was conducted by the software ABAQUS. The effects of slenderness ratio， eccentricity， steel ratio and loading direction on the mechanical properties of composite column under small eccentric compression were analyzed. Simplified calculation formula was proposed， and simplified calculated results were compared with test results and FEM results. The results indicate that slenderness ratio and eccentricity ratio have significant impact on bearing capacity of composite column under small eccentric compression. Increasing of steel ratio can improve the ductility of the composite columns， and loading direction has small influence on bearing capacity. Calculation results of simplified formula are in well agreement with experimental results and FEM results.

Key words： small eccentric compression； finite element analysis； square steel tube filled with steelreinforced highstrength concrete composite column； bearing capacity； ductility

0引言

钢与混凝土组合柱结构以其优良的力学性能在现代建筑结构中得到广泛运用。历次震害调查数据表明，柱在建筑结构中是关键构件，关系到建筑物在地震中是否倒塌。随着现代高层、超高层建筑和大跨建筑快速发展，建筑结构中柱承受的荷载越来越大。如果采用普通钢筋混凝土柱，为满足轴压比不超限，柱截面尺寸会变得很大，不但占用较大的建筑空间，而且在地震作用下容易形成短柱，发生脆性破坏的钢骨钢管高强度混凝土组合柱由于钢管和钢骨的双重约束作用大大改善了高强混凝土的脆性。文献[1]进行了钢骨钢管自密实混凝土组合短柱轴心受压试验，研究试件的破坏模态，提出了组合短柱轴心受压承载力计算公式。……