Steel rebar is generally 12 meters in length, so if more than that is required, it must be joined using methods such as lap splice, welded splice, or mechanical splice. This study compares the flexural strength of reinforced concrete beams without splice, with lap splice, and with Cold Forged sleeve with Parallel Threads (CFSPT) type mechanical splice, to assess the performance of each splice method. The study used beam specimens measuring 200 x 20 x 40 cm with a planned concrete quality f'c 25 MPa. Flexural strength testing resulted in a nominal moment value of 85.209 kNm for the normal beam, 92.952 kNm for the skip beam, and 82.305 kNm for the coupler beam. Based on the nominal moment value of the experiment, the lap splice beam has the highest value and the coupler connection beam has the lowest value. The resulting deflection of the normal beam tends to be higher than that of the lap splice beam and the coupler beam, which is 72.522 mm. While the maximum deflection produced by the lap splice beam and coupler beams is 44.876 mm and 40.191 mm, respectively. The ductility values of the normal beam, lapsplice beam, and coupler beam were 5.949; 3.257; 4.550, respectively.

Reinforcement bars, or rebar, face length limitations, prompting the need for connection methods in construction. Techniques like overlapping splicing, welding, and mechanical clamping address this. This research investigates flexural performance in reinforced concrete beams, focusing on tensile reinforcement splice methods—overlapping and mechanical clamping with a clamp connection. Key aspects such as flexural moment, deflection, and crack patterns are evaluated through laboratory testing using a two-point loading method. Findings show that beams with overlapping splices outperform those with mechanical clamping, with nominal moments of 33.5 kNm and 32.31 kNm, and deflections of 69.37 mm and 49.02 mm, respectively. Crack patterns in both samples indicate failure at one-third of the beam span due to reinforcement splices at the midpoint, enhancing cross-sectional area. In conclusion, this research underscores the superior performance of overlapping splices in terms of nominal moment and deflection, offering valuable insights for optimizing reinforced concrete element performance in structural engineering.

In the construction world, there are several ways to connect reinforcement: lap splice, welding, and mechanical. This study compares the flexural performance of reinforced concrete beams where the reinforcement is connected by lap splice and mechanical threaded coupler type. The size of the reinforced concrete beam used as the test object is 200×300×2000 mm, with an f'c value of 25 MPa. Three test specimen beams were prepared in this study: beams without reinforcement joints beams with lap joints, and beams with mechanical joints. From the laboratory tests, the nominal moment values (Mn) for reinforced concrete beams with lap joints and mechanical coupler-type connections were 42.231 MPa and 29.436 MPa, respectively. The maximum load is on the beam with lap joints of 138.85 kN. From the nominal moment value and maximum load obtained, it can be seen that the beam with lap joints can bear the most significant load. Regarding ductility, beams with coupler connections tend to be more brittle (non-ductile) when compared to beams with lap joints. Therefore, although the coupler-type mechanical connection has benefits, it has yet to be able to replace the lap joints in reinforced concrete beams in terms of strength and ductility. Mechanical connection failure occurred in the reinforcement section, which was turned to connect with the coupler.ABSTRAKDalam dunia konstruksi terdapat beberapa cara untuk menyambung tulangan yakni dengan cara penyaluran lewatan (Lap Splice), pengelasan (welded), dan mekanis. Penelitian ini membandingkan kinerja lentur balok beton bertulang dimana tulangannya disambung dengan cara penyaluran lewatan (Lap Splice) dan mekanis tipe threaded coupler. Ukuran balok beton bertulang yang digunakan sebagai benda uji adalah 200×300×2000 mm dengan nilai f’c 25 MPa. Tiga balok benda uji disiapkan dalam penelitian ini yakni, balok tanpa sambungan tulangan, balok dengan sambungan lewatan, dan balok dengan sambungan mekanis. Dari pengujian laboratorium yang dilakukan didapatkan nilai momen nominal (Mn) untuk balok beton bertulang dengan sambungan lewatan dan sambungan mekanis tipe coupler berturut-turut sebesar 42,231 MPa, dan 29,436 MPa. Beban maksimum terdapat pada balok dengan sambungan lewatan yakni sebesar 138,85 kN. Dari nilai momen nominal dan beban maksimum yang diperoleh dapat dilihat bahwa balok dengan sambungan lewatan dapat menanggung beban terbesar. Dari segi daktilitas, balok dengan sambungan coupler cenderung lebih getas (tidak daktail) jika dibandingkan dengan balok dengan sambungan lewatan. Oleh karena itu, meskipun sambungan mekanis tipe coupler memiliki benefit, namun belum mampu menggantikan sambungan lewatan pada balok beton bertulang dari segi kekuatan dan daktilitas. Kegagalan sambungan mekanis terjadi pada bagian tulangan yang dibubut untuk keperluan penyambungan dengan coupler.