带端板的钢管混凝土轴向局压力学性能的试验

钢管混凝土的端板对钢管混凝土局压力学性能产生一定的影响,变换端板厚度对圆截面与方截面钢管混凝土轴向局压进行试验研究,同时考察截面形状与局压面积比的影响。试验结果表明,随着端板刚度的增加,钢管混凝土的局压力学性能越来越接近全截面受压的情况,截面形状和局压面积比的不同会使端板刚度的影响规律产生差异。采用有限元法计算钢管混凝土的局压承载力获得了较好的计算效果,为进一步的机理分析提供了一条有效的途径。

TESTS ON LOCAL COMPRESSION BEHAVIORS OF AXIALLY LOADED CONCRETE-FILLED STEEL TUBES WITH END PLATES

The End plates of concrete_filled steel tubes (CFST) may influence its local compression behaviors. Therefore local compression behaviors of axially loaded CFST members with circular and square sections with end plates of different rigidity are studied experimentally. Section form and local compression area ratio are also examined. From the results, the local compression behaviors approach to the full section compression case as the rigidity increases. The difference of the section form and local compression area ratio can make the influence of the end plates different. Local compression bearing capacity calculation gets good result with finite element method (FEM),which gives an effective approach to further mechnisam analysis.