改进的组合式L形钢管混凝土柱力学性能试验

为研究改进的组合式L形钢管混凝土柱力学性能,对18个改进的组合式L形钢管混凝土柱进行了轴压试验,分析了钢管厚度、混凝土强度和长细比等参数对试件力学性能的影响,提出了改进的组合式L形钢管混凝土柱承载力计算公式.研究结果表明:试件最终破坏形态主要表现为腰鼓型破坏、局部鼓曲(或拉裂)型破坏和弯曲型破坏;钢管厚度、混凝土强度和长细比均是影响承载力的主要因素,但增加钢管厚度更有利于承载力的提高;含钢率α越大,钢管对核心混凝土的约束作用越强;承载力公式计算结果与试验结果吻合较好.

Tests on mechanical properties of improved composite L-shaped concrete-filled steel tubular columns

To study the mechanical properties of improved composite L-shaped concrete-filled steel tubular columns, 18 axial compression tests of improved composite L-shaped concrete-filled steel tubular columns are carried out. The influences of all parameters included steel tube thickness, concrete strength and slenderness ratio on the mechanical properties of the specimens are analyzed, and the expression of bearing capacity is proposed. The test results indicate that the waist drum failure mode, local buckling (or cracking) failure mode and flexural failure mode are occurred in tests; the steel tube thickness, concrete strength and slenderness ratio are the key factors influencing the bearing capacity, but the increase of steel tube thickness is more beneficial to the improvement of the bearing capacity, if the steel ratio is larger, the confined effect of steel tube to core concrete is stronger. The bearing capacity calculation results are in good agreement with the experimental results.