Górszczyk Jarosław, Malicki Konrad, Kwiecień Arkadiusz
Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
FlexAndRobust Systems Ltd., 24 Warszawska Str., 31-155 Cracow, Poland.
Materials (Basel). 2024 Dec 20;17(24):6229. doi: 10.3390/ma17246229.
Civil engineering structures are subject to both static and dynamic loadings. This applies especially to buildings in seismic areas as well as bridges, viaducts, and road and railway structures loaded with road or rail traffic. One of the solutions used to repair and strengthen such structures in the event of emergency damage are fibre-reinforced polyurethanes (FRPUs). The article proposes a laboratory method for determining the dynamic complex modulus of FRPU composite tape. The theoretical basis for determining the complex modulus for the tested material is presented. Laboratory tests were carried out using the tensile method for four cyclic loading frequencies and a cyclic load ratio equal to 0.5. Under the assumed test conditions, the material showed a viscoelastic performance with a dominant elastic part (storage modulus). For a frequency of 0.1 Hz, the viscous part (loss modulus) was about 8% of the storage modulus value, while for a frequency of 10 Hz, this value was about 5%. For a loading frequency of 0.1 Hz, the elastic part of the complex modulus was about 1160 MPa, while for a frequency of 10 Hz, it was about 1790 MPa. With the increase in loading frequency, the absolute value of the complex modulus increased.
土木工程结构承受着静态和动态荷载。这尤其适用于地震区的建筑物以及承受公路或铁路交通荷载的桥梁、高架桥以及公路和铁路结构。在发生紧急损坏时，用于修复和加固此类结构的解决方案之一是纤维增强聚氨酯（FRPU）。本文提出了一种测定FRPU复合带动态复数模量的实验室方法。给出了测定被测材料复数模量的理论依据。采用拉伸法在四个循环加载频率和循环荷载比等于0.5的条件下进行了实验室试验。在假定的试验条件下，该材料表现出粘弹性性能，其中弹性部分（储能模量）占主导。对于0.1Hz的频率，粘性部分（损耗模量）约为储能模量值的8%，而对于10Hz的频率，该值约为5%。对于0.1Hz的加载频率，复数模量的弹性部分约为1160MPa，而对于10Hz的频率，约为1790MPa。随着加载频率的增加，复数模量的绝对值增大。
