Thangasamy Lakshmi, Kandasamy Gunasekaran
Department of Civil Engineering, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Chennai 603203, India.
Materials (Basel). 2020 May 27;13(11):2444. doi: 10.3390/ma13112444.
In this study, we investigated using coconut shell concrete (CSC) in double-skin steel plate sandwich beams, i.e., steel-concrete-steel (SCS) under flexure. Two cases-without and with shear studs to interconnect the bottom tension and top compression plates-were considered. Conventional concrete (CC) was used for comparison purposes. The effect of quarry dust (QD) in place of river sand (RS) was considered. Therefore, four mixes named as CC, conventional concrete produced using QD (CCQ), CSC and coconut shell concrete produced using QD (CSCQ) were used. Three different steel plate thicknesses were considered (4 mm, 6 mm and 8 mm). In total, twelve SCS specimens were tested to evaluate the flexural performance under two-point static loads. Study parameters include: partial and fully composite, ultimate moment and failures, deflection characteristics, ductility property, cracking behavior and strains in both tension and compression plates. It was found that the moment carrying capacity of the SCS sandwich beams increased when the thickness of the steel plate increased. Our results provided evidence that using QD in place of RS augmented the strength of beams. Theoretical deflections were underestimated the experimental deflection, except in one case. The SCS beams showed good ductility behavior. The SCS beams exhibited crack widths at yielding well below guideline values.
在本研究中，我们研究了在双钢板夹层梁（即钢 - 混凝土 - 钢（SCS）梁）受弯情况下使用椰壳混凝土（CSC）的情况。考虑了两种情况：一种是不设置抗剪栓钉来连接底部受拉板和顶部受压板，另一种是设置抗剪栓钉。使用普通混凝土（CC）作为对比。考虑了用 quarry dust（QD）替代河砂（RS）的影响。因此，使用了四种混合料，分别命名为 CC、使用 QD 生产的普通混凝土（CCQ）、CSC 和使用 QD 生产的椰壳混凝土（CSCQ）。考虑了三种不同的钢板厚度（4 毫米、6 毫米和 8 毫米）。总共测试了十二个 SCS 试件，以评估其在两点静载作用下的抗弯性能。研究参数包括：部分组合和完全组合、极限弯矩和破坏、挠度特性、延性性能、开裂行为以及受拉和受压板中的应变。结果发现，当钢板厚度增加时，SCS 夹层梁的抗弯承载能力提高。我们的结果表明，用 QD 替代 RS 提高了梁的强度。除一种情况外，理论挠度均低于试验挠度。SCS 梁表现出良好的延性性能。SCS 梁在屈服时的裂缝宽度远低于指导值。
