Kim Tae-Kyun, Jung Woo-Tai
Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea.
Polymers (Basel). 2022 Mar 18;14(6):1239. doi: 10.3390/polym14061239.
Prestressed concrete composed of steel materials is increasingly used in various social infrastructures, such as bridges (cables), nuclear containment structures, liquefied natural gas (LNG) tanks, and structural reinforcements. This study aimed to substitute the steel in bridge cables with fiber-reinforced polymers (FRPs) to prevent the damage caused by the performance degradation of corroded prestressed steel. An optimized single-anchorage system was derived by applying multiple variables, such as the surface treatment, number of insert layers, and sleeve processing companies, to improve the maximum load and bonding with the anchorage system sleeve using the carbon FRP (CFRP) cable. The B-L-4 specimen (sleeve specifications of company B, longitudinal surface treatment, and four insert layers) was determined to be the optimized single-anchorage system. When the tensile test was conducted after applying the optimized single-anchorage system to the three- and seven-multi-anchorage systems, the tensile performances of B-L-4 were 100 and 95% of the one-multi-anchorage system, respectively. Considering that the problems associated with the construction of three- and seven-multi-anchorage systems have been addressed, these systems can be applied to actual bridges in the future, and can significantly benefit their maintenance.
由钢材构成的预应力混凝土越来越多地应用于各种社会基础设施，如桥梁（缆索）、核安全壳结构、液化天然气（LNG）储罐以及结构加固。本研究旨在用纤维增强聚合物（FRP）替代桥梁缆索中的钢材，以防止因腐蚀的预应力钢材性能退化而造成的损害。通过应用多个变量，如表面处理、插入层数和套管加工公司等，得出了一种优化的单锚系统，以提高使用碳纤维增强塑料（CFRP）缆索时的最大荷载以及与锚系统套管的粘结力。确定B-L-4试件（公司B的套管规格、纵向表面处理和四层插入层）为优化的单锚系统。在将优化的单锚系统应用于三锚和七锚系统后进行拉伸试验时，B-L-4的拉伸性能分别为单锚系统的100%和95%。鉴于三锚和七锚系统的施工相关问题已得到解决，这些系统未来可应用于实际桥梁，并能极大地有利于其维护。
