Tharmarajah Gobithas, Taylor Su, Robinson Desmond
Department of Civil Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, New Kandy Road, Malabe 10115, Sri Lanka.
School of Natural and Built Environment, Queen's University Belfast, Belfast BT9 5AG, UK.
Polymers (Basel). 2023 Feb 28;15(5):1230. doi: 10.3390/polym15051230.
Experimental and numerical analyses of eight in-plane restrained slabs (1425 mm (length) × 475 mm (width) × 150 mm (thickness)) reinforced with glass fiber-reinforced polymer (GFRP) bars are reported in this paper. The test slabs were installed into a rig, that provided 855 kN/mm in-plane stiffness and rotational stiffness. The effective depths of the reinforcement in the slabs varied from 75 mm to 150 mm, and the amount of reinforcement changed from 0 to 1.2% with 8, 12, and 16 mm bar diameters. A comparison of the service and ultimate limit state behavior of the tested one-way spanning slabs shows that a different design approach is necessary for GFRP-reinforced in-plane restrained slabs that demonstrate compressive membrane action behavior. Design codes based on yield line theory, which considers simply supported and rotationally restrained slabs, are not sufficient to predict the ultimate limit state behavior of restrained GFRP-reinforced slabs. Tests reported a higher failure load for GFRP-reinforced slabs by a factor of 2, which was further validated by numerical models. The experimental investigation was validated by a numerical analysis, and the acceptability of the model was further confirmed by consistent results obtained by analyzing in-plane restrained slab data from the literature.
本文报道了对八块用玻璃纤维增强聚合物（GFRP）筋增强的面内约束板（长1425mm×宽475mm×厚150mm）进行的试验和数值分析。试验板安装在一个刚度为855kN/mm的面内刚度和转动刚度的试验装置中。板中钢筋的有效深度从75mm到150mm不等，钢筋用量从0变化到1.2%，钢筋直径分别为8mm、12mm和16mm。对试验的单向跨板在使用极限状态和极限极限状态下的性能进行比较表明，对于表现出受压薄膜作用性能的GFRP增强面内约束板，需要采用不同的设计方法。基于屈服线理论的设计规范，该理论考虑了简支板和转动约束板，不足以预测约束GFRP增强板的极限极限状态性能。试验报告GFRP增强板的破坏荷载高出两倍，数值模型进一步验证了这一点。通过数值分析验证了试验研究，通过分析文献中的面内约束板数据获得的一致结果进一步证实了模型的可接受性。
