Silva Tiago, Correia Luís, Dehshirizadeh Mozhdeh, Sena-Cruz José
Institute for Sustainability and Innovation in Structural Engineering (ISISE)/Institute of Science and Innovation for Bio-Sustainability (IB-S), University of Minho, Azurém, 4800-058 Guimarães, Portugal.
Department of Civil Engineering, Yazd University, Yazd 8915818411, Iran.
Materials (Basel). 2022 Mar 30;15(7):2536. doi: 10.3390/ma15072536.
This work was developed within the scope of the research project "Easyfloor-Development of composite sandwich panels for building floor rehabilitation", which aims at developing an innovative hybrid sandwich panel as an alternative construction system to conventional floor solutions, mainly for building rehabilitation. The developed hybrid sandwich panel is composed of a top face layer of steel-fibre-reinforced self-compacting concrete (FRC), a core of polyurethane (PUR) closed-cell foam, a bottom face sheet, and lateral webs of glass-fibre-reinforced polymer (GFRP). Full-scale experimental tests on the developed sandwich panels were carried out to characterize their short- and long-term (creep) flexural behaviour. The present work includes a detailed description of the developed panels and the experimental programme carried out and presents and discusses the relevant results. The experimental results showed an almost linear behaviour up to failure. The creep tests were carried out for a period of 180 days, using a creep load equal to 20% of its ultimate loading capacity. An average creep coefficient of 0.27 was obtained for this period. The composed creep model used to simulate the sandwich panel's creep deflections by considering the individual viscoelastic contributions was able to predict the observed structural response with good accuracy.
本研究工作是在“Easyfloor-用于建筑楼板修复的复合夹芯板开发”研究项目的范围内开展的，该项目旨在开发一种创新的混合夹芯板，作为传统楼板解决方案的替代建筑系统，主要用于建筑修复。所开发的混合夹芯板由钢纤维增强自密实混凝土（FRC）顶面层、聚氨酯（PUR）闭孔泡沫芯、底面薄板以及玻璃纤维增强聚合物（GFRP）侧向腹板组成。对所开发的夹芯板进行了全尺寸试验测试，以表征其短期和长期（徐变）弯曲性能。本工作包括对所开发面板和所开展试验方案的详细描述，并展示和讨论相关结果。试验结果表明，直至破坏其行为几乎呈线性。徐变试验进行了180天，使用的徐变荷载等于其极限承载能力的20%。在此期间获得的平均徐变系数为0.27。通过考虑各粘弹性贡献来模拟夹芯板徐变挠度的组合徐变模型能够较好地预测观测到的结构响应。
