Derkowski Adam, Chuda-Kowalska Monika, Kawalerczyk Jakub, Dziurka Dorota, Mirski Radoslaw
Department of Mechanical Wood Technology, Faculty of Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 38/42, 60-627 Poznan, Poland.
Institute of Structural Analysis, Faculty of Civil and Transport Engineering, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965 Poznan, Poland.
Materials (Basel). 2024 Aug 6;17(16):3897. doi: 10.3390/ma17163897.
Combining steel with wood has been practised for many years. The issue is related to two main areas, i.e., bonding steel elements with wood so that they serve as connectors facilitating the assembly of wood elements and bonding steel elements to wood beams to improve their load-bearing capacity. In the first case, the adhesives used may be relatively expensive and more difficult to apply, whereas in the second one, especially when steel elements are glued inside the glulam (GL) beams, it is better if the adhesives used are more accessible to apply and cheaper. As it seems rational to reinforce wood with high-modulus ties, research has been carried out to compare the connection quality of commercially available adhesives that can be used for this purpose. Moreover, thermosetting adhesives have been applied as an alternative and cheaper solution. Thermostat adhesives also have a high pH of the bond, which prevents the steel from rusting. The research shows that the load-bearing capacity of the bond depends on whether the bars are ribbed or sheet metal. Moreover, among thermosetting adhesives, the most favourable load-bearing values were obtained using a mixture of PF/pMDI (phenol formaldehyde resin/polymeric diphenylmethane diisocyanate) and powder from recycled tyres. The shear strength of these joints was 1.63 N/mm and 3.14 N/mm for flat specimens and specimens with ribbed bars, respectively.
钢与木的结合已经实践了很多年。这个问题涉及两个主要方面，即把钢构件与木材粘结在一起，使其作为连接件便于木构件的组装，以及将钢构件粘结到木梁上以提高其承载能力。在第一种情况下，使用的胶粘剂可能相对昂贵且更难应用，而在第二种情况下，特别是当钢构件粘结在胶合木（GL）梁内部时，如果使用的胶粘剂更易于应用且价格更便宜则更好。由于用高模量连接件加固木材似乎是合理的，因此已经开展了研究来比较可用于此目的的市售胶粘剂的连接质量。此外，热固性胶粘剂已被用作一种替代且更便宜的解决方案。热固性胶粘剂的粘结pH值也很高，这可以防止钢材生锈。研究表明，粘结的承载能力取决于钢筋是带肋的还是金属板的。此外，在热固性胶粘剂中，使用酚醛树脂/聚合二苯基甲烷二异氰酸酯（PF/pMDI）和回收轮胎粉末的混合物获得了最有利的承载值。对于扁平试件和带肋钢筋试件，这些接头的抗剪强度分别为1.63 N/mm和3.14 N/mm。
