Liu Yue, Gu Mingyang, Liu Xiaogang, Tafsirojjaman T
Research Institute of Urbanization and Urban Safety, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, China.
The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Pingleyuan Road 100, Beijing 100124, China.
Polymers (Basel). 2022 Apr 25;14(9):1740. doi: 10.3390/polym14091740.
With the advantages of high strength, light weight, high corrosion and fatigue resistance, and low relaxation, carbon-fiber-reinforced polymer (CFRP) is an excellent cable material for cable-stayed bridges. However, the relatively high unit price of CFRP compared to that of steel may hinder the large-scale application of CFRP stay cables. This paper presents the economic comparison between long-span cable-stayed bridges using CFRP cables and the corresponding steel cable-stayed bridges through life-cycle cost analysis (LCCA). Three CFRP cable-stayed bridges with a main span of 600 m, 1200 m, and 1800 m, respectively, along with their steel counterparts, were designed, and their life-cycle costs (LCCs) were calculated. The comparison of LCCs was not only between the CFRP and steel cable-stayed bridges with the same span, but also between the cable-stayed bridges with different spans. Furthermore, the different unit prices of CFRP cables and different replacement frequencies of steel cables were also investigated. The results show that the initial design and construction cost of the long-span CFRP cable-stayed bridge is higher than that of the corresponding steel cable-stayed bridge, although using CFRP cables can reduce the materials used, primarily due to the higher unit price of the CFRP cable. Despite the higher initial cost, the long-span CFRP cable-stayed bridge can still achieve lower LCC than the steel cable-stayed bridge, because it has significantly lower rehabilitation cost and user cost, as well as slightly lower vulnerability cost. Furthermore, with the increase in the main span and the decrease in the unit price of CFRP cables, the LCC advantage of the long-span CFRP cable-stayed bridge becomes more obvious.
碳纤维增强聚合物（CFRP）具有高强度、轻质、高耐腐蚀和抗疲劳性能以及低松弛等优点，是斜拉桥理想的缆索材料。然而，与钢材相比，CFRP的单价相对较高，这可能会阻碍CFRP斜拉索的大规模应用。本文通过生命周期成本分析（LCCA），对使用CFRP缆索的大跨度斜拉桥与相应的钢斜拉桥进行了经济比较。分别设计了主跨为600米、1200米和1800米的三座CFRP斜拉桥及其钢桥对应物，并计算了它们的生命周期成本（LCC）。LCC的比较不仅在相同跨度的CFRP和钢斜拉桥之间进行，还在不同跨度的斜拉桥之间进行。此外，还研究了CFRP缆索的不同单价和钢缆索的不同更换频率。结果表明，大跨度CFRP斜拉桥的初始设计和建造成本高于相应的钢斜拉桥，尽管使用CFRP缆索可以减少材料使用，主要是因为CFRP缆索单价较高。尽管初始成本较高，但大跨度CFRP斜拉桥仍能实现比钢斜拉桥更低的LCC，因为它的修复成本和用户成本显著更低，以及脆弱性成本略低。此外，随着主跨的增加和CFRP缆索单价的降低，大跨度CFRP斜拉桥的LCC优势变得更加明显。
