本研究之目的在於提出具有鎖緊功能的新型螺紋節鋼筋續接器，並設計其合適的螺紋節鋼筋續接器之尺寸，以期符合SA級鋼筋續接器性能檢驗之規定。文中首先整理國內外現有鋼筋續接器的相關文獻資料，並評估各鎖緊裝置之優劣；其次，根據螺紋節鋼筋續接器的功能需求，依照設計程序提出具有可行性的新型續接器，並評估出較佳二型的構想，第一型採用雙偏心鎖緊螺帽來接合鋼筋與續接器，第二型則利用續接器兩端具溝槽之錐形凸出物的變形，來夾持鋼筋以避免鬆動。然後利用螺栓與螺帽鎖緊之鎖緊扭矩計算式，及螺紋受力後之應力分析，配合有限元素法ANSYS進行應力應變分析，據以設計適當的續接器尺寸，避免塑性變形情況發生；最後，完成兩新型構想之螺紋節鋼筋續接器之尺寸設計。

　The purpose of this study is to propose two new locking couplers for threaded bars and to design the proper dimensions for the couplers to meet the requirements for the necessary tests of SA grade of the locking coupler for threaded bars. First of all, relative references about splicing manners are collected to evaluate the advantages of different connectors. Next, according to the function requirement for threaded-bar couplers, some new feasible threaded-bar couplers are synthesized through a systematic design procedure. Two of them are then evaluated for further dimensional design. A pair of lock-nuts with an eccentric taper end is applied in the first type of designs for connecting two threaded bars. In the second one, two threaded bars are locked by means of the deformation of coupler with grooves for preventing loosening. In order to analyzing the deformation behavior of the threaded-bar coupler, the analysis of the locking torque, thread stress between bolt and nut, and the strain-stress analysis using the finite element method(ANSYS) are applied to design the proper dimensions of the threaded-bar coupler for the sake of preventing plastic deformation. Finally, the dimensions of two new locking couplers for threaded bars are fully completed.

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