Joju, JonesJonesJojuYu-Chen Ou2025-07-302025-07-3020259789819646975978981964698223662557https://www.scopus.com/record/display.uri?eid=2-s2.0-105009254613&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/730822Composite moment frame structures with Reinforced Concrete (RC) columns and Steel (S) beams are termed as RCS structures. RCS structures combine the inherent stiffness and economy of RC columns with the light-weight and long-spanning capability of steel beams to produce a structurally efficient and cost-effective structural system. The key to the development of RCS system is the design of beam-column joint details. Over the years, multiple innovative RCS joint details have been tested and incorporated in to the design guidelines. The existing design guidelines primarily deals with concentric RCS joint details developed for RC columns with square/rectangular cross-sections. However, architectural requirements often necessitate eccentric joints and joints with circular RC columns. Additionally, the joint details available in the existing design guidelines were developed for RC columns with conventional deformed bars with specified yield stress of 410–490 MPa. Hence, “New-RCS” project was initiated in Taiwan in 2020, to address the shortcomings of existing design guidelines. The term “New” refers to the use of high-strength deformed bars with specified yield stress of 690 MPa along with high-strength concrete in columns. As a part of New-RCS project, innovative through-beam and through-column type RCS joint details were developed for eccentric and concentric joints with columns having circular and square cross sections. Further, a re-evaluation of the existing analytical procedures to estimate joint strength, with focus on bearing strength estimation was also undertaken. Large-scale experimental testing of twenty-three beam-column subassemblies were carried out as a part of the project to evaluate the seismic behaviour and verify the adequacy of the newly proposed joint details. The joint details and design procedures developed as part of this study were crucial to the design and construction of a 27-storey office building with RCS structural system, which in nearing its competition in Taipei.falseBeam-column jointComposite StructuresHigh-strength steel reinforcementMoment frameRCSconference paper10.1007/978-981-96-4698-2_332-s2.0-105009254613