Compressive behavior of double-skin tubular stub columns with recycled aggregate concrete and a PET FRP jacket
Compressive behavior of double-skin tubular stub columns with recycled aggregate concrete and a PET FRP jacket
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DOI：
10.1016/j.conbuildmat.2022.127321
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发表时间：
2022-05
影响因子：
7.4
通讯作者：
Yu Bai;Yu-Feng Zhang;J. Jia;Q. Han;W. Gao
中科院分区：
文献类型：
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作者：
Yu Bai;Yu-Feng Zhang;J. Jia;Q. Han;W. Gao
对再生骨料混凝土（RAC）和聚对苯二甲酸乙二酯（PET）纤维增强复合材料（FRP）-混凝土-钢双层钢管短柱（DSTSC）的受压性能进行了试验研究。RAC是天然骨料混凝土（NAC）的一种绿色可持续替代品，但其力学性能一般不如NAC。聚对苯二甲酸乙二醇酯（PET）FRP由回收塑料制成，与纯聚乙烯FRP相比，具有超过7%的大断裂应变（LRS）值。在这项研究中，共20个DSTSC样本进行了测试下的轴向压缩。研究的主要参数是RAC替换百分比（0、50和100%）、FRP护套厚度和钢管厚度（3和5 mm）。试验结果表明，RAC和PET FRP加固的DSTSC柱的抗压性能与NAC和PET FRP加固的DSTSC柱的抗压性能相似，且两种柱均表现出较高的延性。研究还表明，FRP护套和钢管的约束刚度对钢管混凝土空心板的抗压性能有较大影响，而再生混凝土的取代率对钢管混凝土空心板的抗压性能影响不大。FRP护套或钢管刚度的增加可以抵消RAC置换率对DSTSC轴压性能的影响。最后，根据本研究的实验结果，对现有的不同类型的DSTSC的极限状态模型的适用性进行了研究。
This paper presents an experimental study on the compressive behavior of hybrid fiber reinforced polymer (FRP)-concrete-steel double-skin tubular stub columns (DSTSCs) with recycled aggregate concrete (RAC) and a polyethylene terephthalate (PET) FRP jacket. RAC is a green, sustainable alternative to natural aggregate concrete (NAC), while its mechanical properties are generally inferior to NAC. Polyethylene terephthalate (PET) FRP is manufactured from recycled plastics and has a large rupture strain (LRS) value of more than 7% compared to pure polyethylene FRP. In this study, a total of 20 DSTSC specimens were tested under axial compression. The main parameters studied were the RAC replacement percent (0, 50 and 100%), the FRP jacket thickness, and steel tube thicknesses (3 and 5 mm). Test results indicated that the compressive behavior of DSTSC specimens with RAC and PET FRP is similar to that of specimens with NAC and PET FRP, and both types of columns exhibit highly ductile compressive behavior. It is also observed that the compressive behavior of DSTSCs is primarily influenced by the confinement stiffness of the FRP jacket and the steel tube, and the replacement percent of RAC has marginal effect. The increase of the FRP jacket or steel tube stiffness can counterbalance the replacement percent effect of RAC on the axial compressive behavior of DSTSCs. Finally, the suitability of the existing ultimate condition models of different types of DSTSCs was investigated based on the experimental results of this study.