Expanding the service life length of wooden made furniture, and consequently decreasing the demand for raw wood could help the economy of the world society and environmental safety. In this research, an experimental inquiry was conducted to determine the effects of curved members, the frame integrity, chair scheme, and rehabilitation of even the failed chairs on the behavior of chairs. The flexural properties of the curved specimens were firstly determined using the ASTM D143-94 test. Then, three layouts of chairs (A, B, and C) made from poplar wood were examined under the DIN EN-1729-1&2 standard. Finally, the failed chairs were rehabilitated using the sheets of glass fiber-reinforcing polymers (GFRP) and re-tested. The results showed that the rehabilitation of the curved samples causes rebounding of their mechanical properties. Besides, the rehabilitated samples are more flexible than primary ones. Furthermore, the results demonstrate that the capability of the proposed normalized modulus of rupture (NMOR) criterion, in contrast to the current modulus of rupture (MOR) one, for predicting the failure modes and regions of the wooden and composite structures. The experiments on the chairs showed that all rehabilitated patterns are more robust than primary schemes. That means, the discarded (or discarding) chairs (due to failure of joints, legs, or, in general, a part of the chairs) return to their service life, and massively reduce the demand for wood, which is strongly favored by environmental aspects. Moreover, rehabilitated layout B (RB), which has two continuous-main-curved members is at least 2.4 times stronger than other rehabilitated patterns, and rehabilitated layout C (RC) having three continuous-main-curved members is about 40% stronger than a rehabilitated custom chair (RA), that illustrates more integrity and strength. Besides that, the strength of RB is 2.22 and 2.04 times that of the corresponding primary chairs, depending on front-to-back and up-to-down loading, respectively. Finally, univariate analyses of variance and least significant difference (LSD) showed the high precision of the results. Consequently, the research provides a facility not only to save original material resources, but also to eliminate furniture waste going in the landfill.

中文翻译：

---

调查康复的影响以及使用弯曲整合构件对椅子行为的影响

延长木制家具的使用寿命，从而减少对原木的需求，可以帮助世界经济和环境安全。在这项研究中，进行了一项实验性调查，以确定弯曲构件，框架完整性，椅子方案以及甚至故障椅子的康复对椅子行为的影响。首先使用ASTM D143-94测试确定弯曲试样的弯曲特性。然后，根据DIN EN-1729-1＆2标准检查了三种由杨木制成的椅子（A，B和C）的布局。最后，使用玻璃纤维增​​强聚合物（GFRP）片修复了失效的椅子并进行了重新测试。结果表明，弯曲样品的修复导致其力学性能反弹。除了，修复后的样本比原始样本更灵活。此外，结果表明，与当前的断裂模量（MOR）相比，提出的归一化断裂模量（NMOR）准则能够预测木质和复合结构的破坏模式和区域。在椅子上进行的实验表明，所有修复的模式都比主要方案更健壮。这意味着，废弃的（或废弃的）椅子（由于关节，腿或一般来说一部分椅子的损坏）恢复了使用寿命，并大大减少了对木材的需求，这受到环境的强烈青睐。方面。此外，具有两个连续主弯曲成员的修复后的布局B（RB）比其他修复后的样式至少强2.4倍，具有三个连续主弯曲构件的修复后的布局C（RC）比修复后的定制椅子（RA）坚固约40％，这说明了更高的完整性和强度。除此之外，RB的强度分别是相应的主椅的2.22倍和2.04倍，具体取决于前后负载和上下负载。最后，方差和最小有效差（LSD）的单变量分析显示了结果的高精度。因此，该研究不仅提供了一种节省原始材料资源的设施，而且还消除了垃圾填埋场中的家具浪费。分别是前后椅子和上下椅子负载的04倍。最后，方差和最小有效差（LSD）的单变量分析显示了结果的高精度。因此，该研究不仅提供了一种节省原始材料资源的设施，而且还消除了垃圾填埋场中的家具浪费。分别是前后椅子和上下椅子负载的04倍。最后，方差和最小显着差异（LSD）的单变量分析显示了结果的高精度。因此，该研究不仅提供了一种节省原始材料资源的设施，而且还消除了垃圾填埋场中的家具浪费。