Preinstorfer Philipp, Huber Tobias, Reichenbach Sara, Lees Janet M, Kromoser Benjamin
Department of Engineering, University of Cambridge, 7a JJ Thomson Ave, Cambridge CB3 0FA, UK.
Institute of Structural Engineering, TU Wien, Karlsplatz 13/212-2, 1040 Vienna, Austria.
Polymers (Basel). 2022 Jun 12;14(12):2383. doi: 10.3390/polym14122383.
Fibre-reinforced polymers (FRPs) are a promising corrosion-resistant alternative to steel reinforcement. FRPs are, however, generally costly and have a high energy demand during production. The question arises whether the high performance of FRPs and possible savings in concrete mass can counterbalance initial costs and environmental impact. In this paper, a parametric design study that considers a broad range of concrete infrastructure, namely a rail platform barrier, a retaining wall and a bridge, is conducted to assess the mass-related global warming potential and material costs. Design equations are parametrised to derive optimum reinforced concrete cross-sectional designs that fulfil the stated requirements for the serviceability limit state and ultimate limit state. Conventional steel reinforcement, glass and carbon FRP reinforcement options are evaluated. It is observed that the cross-sectional design has a significant influence on the environmental impact and cost, with local extrema for both categories determinable when the respective values become a minimum. When comparing the cradle-to-gate impact of the different materials, the fibre-reinforced polymer-reinforced structures are found to provide roughly equivalent or, in some cases, slightly more sustainable solutions than steel-reinforced structures in terms of the global warming potential, but the material costs are higher. In general, the size of the structure determines the cost competitiveness and sustainability of the FRP-reinforced concrete options with the rail platform barrier application showing the greatest potential.
纤维增强聚合物（FRP）是一种很有前景的用于替代钢筋的耐腐蚀材料。然而，FRP通常成本高昂，并且在生产过程中能源需求很大。FRP的高性能以及在混凝土用量上可能的节省是否能够抵消初始成本和环境影响，这一问题由此产生。在本文中，开展了一项参数化设计研究，该研究考虑了广泛的混凝土基础设施，即铁路站台护栏、挡土墙和桥梁，以评估与质量相关的全球变暖潜能值和材料成本。对设计方程进行参数化处理，以得出满足正常使用极限状态和承载能力极限状态既定要求的最佳钢筋混凝土截面设计。对传统的钢筋、玻璃纤维增强塑料（GFRP）和碳纤维增强塑料（CFRP）加固方案进行了评估。研究发现，截面设计对环境影响和成本有重大影响，当各自的值达到最小值时，这两类都存在局部极值。在比较不同材料从摇篮到大门阶段的影响时，发现纤维增强聚合物加固结构在全球变暖潜能值方面与钢筋加固结构大致相当，在某些情况下甚至提供了略具可持续性的解决方案，但材料成本更高。总体而言，结构的尺寸决定了FRP加固混凝土方案的成本竞争力和可持续性，铁路站台护栏应用显示出最大的潜力。
