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Bond repair of cracked beams

机译：裂缝梁的粘接修复

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The repair of cracked timber beams on site frequently involves crack injection with adhesives followed by the application of the chosen strengthening system, involving bonded or bolted metal plates or rods or bonded pultruded GFRP or CFRP profiles. Although strengthening design will not generally take into account the contribution of injecting adhesives in the crack volume region it is felt that this contribution to overall strengthening of the component or structure may be of some significance. A test programme was therefore developed at LNEC to assess the strength and stiffness of timber beams which were treated with epoxy adhesives after they had developed failure in a 4 point bending test. It is recognised that partially broken beams may have very narrow, almost invisible, fissures, which are difficult to impregnate. As well as the forgoing partially separated broken beams may present extremely irregular split ends, which are difficult to bring back into perfect alignment and contact. These two factors may reduce the effectiveness of the strength restoration and were considered in the experimental study. However, the specific beam failure appearance is not likely to give a clear indication of how efficient the consolidation turns out to be. Test results show that epoxy adhesive injection of cracked timber beams may lead to a not insignificant, but somewhat variable, strength recovery (0.45 to 1.11) and to a significant stiffness recovery (0.74 to 0.99) of broken beams. Having these results in mind, although on site repair of broken timber beams should not rely on epoxy adhesives injection only, its contribution to the stiffness of strengthened beams is significant and one should make use of this advantage.
机译：在现场的裂纹木梁的修复经常涉及用粘合剂的裂纹注射，然后施加所选择的强化系统，涉及粘合或螺栓金属板或杆或粘合的草莓GFRP或CFRP型材。虽然强化设计通常不会考虑注入粘合剂在裂缝体积区域中的贡献，但感受到这种对组分或结构的总体加强的贡献可能具有一些重要意义。因此，在LNEC中开发了测试程序，以评估木梁的强度和刚度，在4点弯曲试验中发生了在发生失效后用环氧粘合剂处理的木梁的强度和刚度。据认识到，部分断裂梁可能具有非常窄的，几乎看不见的裂缝，这难以浸渍。除了上面的部分分离的断线线可以呈现极其不规则的分裂端，这难以引起完美的对准和接触。这两个因素可以降低强度恢复的有效性，并在实验研究中考虑。然而，具体的光束故障外观不太可能清楚地表明整合结果的效率如何。测试结果表明，环氧粘合剂注入裂纹木梁可能导致不微不足道，但有些可变的强度恢复（0.45至1.11），并且具有断裂梁的显着刚度恢复（0.74至0.99）。拥有这些结果的思想，尽管在现场修复破碎的木梁不应该依靠环氧粘合剂注射，但其对加强梁的刚度的贡献是显着的，并且应该利用这种优势。

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