Hammerl Mathias, Kromoser Benjamin
Institute of Green Civil Engineering, University of Natural Resources and Life Sciences Vienna, Peter-Jordan-Straße 82, 1190 Vienna, Austria.
Materials (Basel). 2022 May 27;15(11):3843. doi: 10.3390/ma15113843.
Materials such as high performance (HPC) or ultra-high performance concrete (UHPC), and fibre-reinforced polymer (FRP) reinforcement can be used to improve the resource efficiency in concrete construction by, for example, enabling the production of thin-walled structures. When building filigree concrete beams two essential factors must be considered: the low stiffness of the structure and the bond between the materials. By prestressing the structural stiffness is improved while an adequate concrete cover ensures sufficient bond strength. Based on this the bending behaviour of prestressed T-shaped beams reinforced with FRP, focussing on determining the influence of four parameters on the bearing capacity, bond behaviour and failure mode, is investigated in this paper. Comprehensive experimental investigations prove the potential of the approach and show that a reduction of the web thickness down to 40 mm, a lower concrete quality, and the use of glass FRP instead of carbon FRP allow a more resource-efficient structure while the applied prestressing leads to a higher utilisation of the high performance materials.
高性能混凝土（HPC）或超高性能混凝土（UHPC）以及纤维增强聚合物（FRP）增强材料等材料可用于提高混凝土结构施工中的资源效率，例如，可用于生产薄壁结构。在建造精致混凝土梁时，必须考虑两个关键因素：结构的低刚度和材料之间的粘结力。通过施加预应力可提高结构刚度，而适当的混凝土保护层可确保足够的粘结强度。基于此，本文研究了用FRP增强的预应力T形梁的弯曲性能，重点确定四个参数对承载能力、粘结性能和破坏模式的影响。全面的试验研究证明了该方法的潜力，并表明将腹板厚度减小至40mm、采用较低质量的混凝土以及使用玻璃纤维增强塑料（GFRP）代替碳纤维增强塑料（CFRP），可以实现资源利用效率更高的结构，同时施加的预应力能使高性能材料得到更高程度的利用。
