大径厚比圆钢管约束型钢混凝土短柱轴压性能研究

发布时间：2018-12-10 12:53

【摘要】：通过对6根大径厚比(D/t取120,133)圆钢管约束型钢混凝土短柱的轴压试验,研究了钢管径厚比和抗剪栓钉对型钢混凝土柱轴压性能的影响。试验结果表明:钢管的约束作用可以提高核心混凝土抗压强度,改善构件的延性;在轴心压力作用下,型钢与混凝土协同变形,抗剪栓钉对构件的破坏模式、轴压承载力和延性无明显影响。通过分析峰值荷载时钢管应变沿高度的变化趋势,将钢管沿柱高度分为非应变协调区和应变协调区。钢管环向约束应力在非应变协调区随测点高度线性减小,在应变协调区保持不变。根据试验和理论计算结果,提出了同时考虑钢管和型钢约束作用的圆钢管约束型钢混凝土短柱轴压承载力计算式,其计算结果与试验结果吻合较好。
[Abstract]:The influence of diameter to thickness ratio of steel tube and shear bolt on the axial compression behavior of steel reinforced concrete columns confined by circular steel tubes was studied by axial compression test of six short steel tubular columns with large diameter to thickness ratio (D / t = 120133). The test results show that the constraint effect of steel tube can improve the compressive strength of the core concrete and improve the ductility of the members. Under the action of axial pressure, the joint deformation of steel and concrete and the failure mode, bearing capacity and ductility of the members are not affected by the shear bolt. By analyzing the variation trend of the steel tube strain along the height under the peak load, the steel pipe along the column height is divided into the non-strain coordinated zone and the strain coordinated zone. The circumferential confined stress of the steel pipe decreases linearly with the height of the measuring point in the non-strain coordination region, and remains unchanged in the strain coordination region. Based on the experimental and theoretical results, a formula for calculating the axial compressive capacity of short steel reinforced concrete columns confined by circular steel tubes is proposed, which takes into account the constraint of steel pipe and section steel at the same time. The calculated results are in good agreement with the experimental results.
【作者单位】：重庆大学土木工程学院;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金项目(51178210,51438001)
【分类号】：TU398.9

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