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Study on behavior of partially prefabricated steel reinforced concrete stub columns under axial compression

机译：部分预制钢骨混凝土短柱的轴向受压性能研究

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摘要

This paper aims to investigate the axial behavior and axial ultimate strength of partially prefabricated steel reinforced concrete (PPSRC) stub columns subjected to axial load. Eleven solid PPSRC column specimens and three hollow PPSRC column specimens were tested to examine the failure mode, the load-displacement response and the axial bearing strength of PPSRC columns. The effects of stirrup spacing, cast-in-place concrete strength and flange shear studs on the axial performance of PPSRC columns were also analyzed. Furthermore, an effective confinement stress from steel shape on the concrete was established on the basis of existing literature. The test results indicated that the PPSRC stub columns exhibited high axial load capacity and good deformability. Higher strength of inner concrete and smaller spacing of stirrups results in higher axial resistance, but the shear studs on the flange of steel shape were not effective on enhancing the axial-carrying capacity. Calculation formula to predict the compressive capacity of PPSRC columns was proposed based on the tested results. By comparison, it was found that the calculated results agreed well with the test results, which indicated that the proposed method had adequate accuracy and can be used in engineering application.
机译：本文旨在研究部分预制钢钢筋混凝土（PPSRC）短柱在轴向载荷下的轴向性能和轴向极限强度。测试了11个实心PPSRC柱标本和3个中空PPSRC柱标本，以检查PPSRC柱的破坏模式，载荷-位移响应和轴向承载强度。还分析了箍筋间距，现浇混凝土强度和法兰抗剪栓钉对PPSRC柱的轴向性能的影响。此外，在现有文献的基础上，建立了由钢形状对混凝土的有效约束应力。试验结果表明，PPSRC短柱具有较高的轴向承载能力和良好的变形能力。较高的内部混凝土强度和较小的箍筋间距会导致较高的轴向阻力，但钢形法兰上的抗剪螺柱对提高轴向承载力无效。根据试验结果，提出了预测PPSRC柱抗压能力的计算公式。通过比较，发现计算结果与试验结果吻合良好，表明所提方法具有足够的精度，可用于工程应用。

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