刘君平, 周宗源, 刘永健, 陈宝春. 具有PBL加劲的方钢管混凝土构件受弯性能[J]. 工程力学, 2017, 34(12): 104-111. DOI: 10.6052/j.issn.1000-4750.2016.08.0603
引用本文: 刘君平, 周宗源, 刘永健, 陈宝春. 具有PBL加劲的方钢管混凝土构件受弯性能[J]. 工程力学, 2017, 34(12): 104-111. DOI: 10.6052/j.issn.1000-4750.2016.08.0603
LIU Jun-ping, ZHOU Zong-yuan, LIU Yong-jian, CHEN Bao-chun. MECHANICAL PERFORMANCE OF CONCRETE-FILLED SQUARE STEEL TUBE STIFFENED WITH PBL UNDER BENDING[J]. Engineering Mechanics, 2017, 34(12): 104-111. DOI: 10.6052/j.issn.1000-4750.2016.08.0603
Citation: LIU Jun-ping, ZHOU Zong-yuan, LIU Yong-jian, CHEN Bao-chun. MECHANICAL PERFORMANCE OF CONCRETE-FILLED SQUARE STEEL TUBE STIFFENED WITH PBL UNDER BENDING[J]. Engineering Mechanics, 2017, 34(12): 104-111. DOI: 10.6052/j.issn.1000-4750.2016.08.0603

具有PBL加劲的方钢管混凝土构件受弯性能

MECHANICAL PERFORMANCE OF CONCRETE-FILLED SQUARE STEEL TUBE STIFFENED WITH PBL UNDER BENDING

  • 摘要: 为研究具有PBL加劲的方钢管混凝土构件的受弯性能,该文进行了无加劲肋、钢板加劲肋和PBL加劲肋三种方钢管混凝土构件受弯性能的试验研究,同时考察PBL加劲肋孔径大小和间距的影响,试验结果表明,无加劲肋构件为单波鼓曲破坏,钢板加劲肋和PBL加劲肋构件均为双波鼓曲破坏;PBL加劲肋试件管内受拉混凝土裂缝分布更为均匀,裂缝宽度和间距更小,钢管与混凝土共同受力更好;PBL加劲肋对方钢管混凝土抗弯承载力提高不明显,抗弯刚度提高约20%;钢板加劲肋是否开孔对试件的刚度影响不大。该文还进行了PBL加劲肋构造参数的影响分析,结果表明:具有PBL加劲的方钢管混凝土构件抗弯承载力随着PBL加劲肋高度、宽度的增加而增加,随着开孔孔径d0的增大而减小;开孔间距对承载力的影响很小。在试验研究和数值分析基础上,提出了具有PBL加劲的方钢管混凝土构件抗弯承载力的简化计算方法,建议在实际工程中,相对开孔孔径和间距分别取0.5和2.0为宜。

     

    Abstract: To study the mechanical performance of concrete-filled square steel tube stiffened with PBL under bending, this paper describes a comparison test study on the mechanical behavior of three types of concrete-filled square steel tube structure under bending. The first type is concrete-filled square steel tube, the second type is concrete-filled square steel tube with steel plate stiffening rib, and the third type is concrete-filled square steel tube with PBL stiffening rib. The influences of aperture size and spacing of PBL were also investigated. Test results indicate that the failure mode of the first type specimen was single wave buckling, the failure modes of the other two were double wave buckling. Concrete crack distribution of the third type specimen was more uniform, and the width and spacing were smaller, showing steel tube and concrete worked together better. The bending capacity improved by PBL stiffening rib was not obvious, but the bending rigidity was increased by about 20% compared with the first type specimen. Whether the steel plate rib has pore or not had little effect on the rigidity of specimens. FEA results demonstrate that the bending capacity increased with the increase of the height and width of PBL stiffening rib, but decreased with the increase of relative pore diameter d0, and the influence of pore spacing on bearing capacity was very small. Based on the test and FEA results, a simplified calculation method of concrete-filled square steel tube with PBL stiffening rib was proposed, and the value of relative pore diameter and relative pore spacing were recommended as 0.5 and 2.0 respectively in practical project.

     

/

返回文章
返回