- 學位論文
積層竹材方榫接合抗彎強度之研究
A Study on the Bending Moment of Mortise and Tenon Joints of Laminated Bamboo
摘要
方榫接合是木製家具經常使用於結構設計上，而用於竹材家具上之強度研究尚少。本研究以木製家具結構常用之方榫接合為研究重點，首先以抗彎強度試驗來測試方榫接合結構之強度，觀察並記錄試驗測試時所造成的抗彎結構之變化，以探討方榫接合結構受彎曲破壞時之接合特性。其次，探討國內外膠合劑的種類及方榫構件的長度等條件，運用T型試材探討榫接合彎矩破壞性質與發生膠合現象之關係。期盼藉由家具榫接性能與發生抗彎特性的探討，能有助於家具結構性能之非破壞性評估，並供產業界應用及學術研究之參考。 本研究探討三種類型的膠合劑與不同榫頭長度(30、40、45mm)與寬度(30、40mm) 的構件對抗彎強度的影響。在試驗過程中，由於控制因素不儘嚴謹，導致最終試驗出的研究數據不甚完整。綜合實驗結果得到以下結論： 一、 竹材榫接結構的抗彎強度，以榫接合長度為榫長40mm榫寬40mm時，環氧AB樹脂為287kgf/cm較佳、尿素AB樹脂的240.8kgf/cm次之、白膠的237.2kgf/cm為最小。 二、 方榫接合抗彎強度自最強到最弱依序為：環氧AB樹脂(Epoxy Resin) > 尿素AB樹脂(Urea Resin，65%60℃) > 白膠(white glues，40%25℃)。 三、 在接合結構上，在試才榫寬長度相同時，以榫頭長度40mm之抗彎強度為最佳。結論質應該是45mm為最佳，可能控制因素不夠嚴謹，導致與基本理論相反之結果。 四、 根據中華木質構造建築協會木材品質檢驗中心，以CNS454「木材抗彎試驗法」，測定出木竹材之抗彎強度。孟宗竹與麻竹之抗彎強度分別為257kgf/cm及249kgf/cm，紅檜與松木之抗彎強度分別為470kgf/cm及425kgf/cm。
並列摘要
Mortise and tenonjointed was furniture and even product design often used in the bonding structure, structure change or method of maintenance reinforcement. Research in the field of forestry science have been constantly changing in recent years, bending bonding technology has become more sophisticated. Bending bonding technology apply in assessing of the wood materials and the strength of the wood with glue. There is still rare in the study of bamboo laminated wood furniture structure and research on the relationship between the flexural bonding. In this study, research priorities on commonly used in furniture construction and tenon joints of square mortise. First, investigate changes in the structure of the bending strength of the furniture bonding occurs during bending test, to understand the bending characteristics when destruction by gluing. Secondly, explore the types of glue internal and external, set mortise and tenon joints with adhesive type and length, to discuss destruction of nature and the mortise and tenon joints by t-test materials. By looking discussion furniture mortise performance characteristics and the occurrence of bending to help non-destructive evaluation of the structural performance of the furniture and reference applications for industry and academic. In this study, change of the three types glue and the tenon length (30,40,45 mm) and width (30,40 mm),impact on the flexural strength member, comprehensive experimental results the following conclusions can be obtained 1. Strength of bamboo mortise structure, epoxy resin was 287 kgf/cm2 better that urea resin240.8kgf/cm2 and white glues237.2kgf/cm2 2. Bending moment of mortise and tenon joints that is Epoxy Resin > Urea Resin(65%60℃) > white glues(40%25℃) . 3. Tenon length 40mm bending strength was the best when width dimensions remain unchanged in the bonding structure. Conclusions should be 45mm for the best but controlling factor is not stringent enough, lead to the opposite results of the basic theory. 4. According to the Chinese Wood Construction Buildings Association, Wood bending test with the CNS454, determine the strength of wood and bamboo, there was Moso bamboo 257kgf/cm and Ma Bamboo 249kgf/cm, Taiwan Red Cypress was 470kgf/cm and pine was 425kgf/cm.