The seismic performance of steel-reinforced-concrete (SRC) composite columns with non-seismic details in older buildings is not sufficiently characterized due to lack of cyclic test data. Formal recommendations for cyclic backbone curves of these columns for performance-based seismic assessment are not currently available. In addition, the effect of axial loads on the deformation capacity of SRC columns is uncertain. Furthermore, SRC composite columns with modern seismic details lack formal recommendations for nonlinear modeling parameters or acceptance criteria. This study aims to fill some of these knowledge gaps via experimental and analytical means. The cyclic behavior of five SRC composite columns with non-seismic and seismic details failing in flexural-tension or flexural-compression modes has been experimentally investigated. Test results show that tension-controlled SRC columns with non-seismic details can sustain up to 6% drift ratio with minor strength degradation, satisfying modern seismic assessment criteria and suggesting no need to be retrofitted. However, high axial loads were found to jeopardize drift capacity of compression-controlled SRC columns with non-seismic details (2% peak-load drift capacity), leading to premature axial failure. Test results suggest the possibility of relaxing the ACI 318–19 confinement requirements for tension-controlled SRC columns with seismic details. A database of past cyclic tests of SRC composite columns with seismic and non-seismic details has been developed. Database response parameter trends have been analyzed and compared. Based on the current test results and the database trends, new drift and ductility capacity expressions for SRC columns with non-seismic details in older buildings are proposed. Furthermore, based on current test results and the database trends, new ASCE 41-17-style lower bound nonlinear modeling parameters for flexural-controlled SRC composite columns with non-seismic details are proposed for performance-based seismic assessment.

由于缺乏循环测试数据，旧建筑中具有非抗震细节的钢-钢筋混凝土 (SRC) 组合柱的抗震性能没有得到充分表征。目前还没有针对这些柱子的循环骨干曲线进行基于性能的地震评估的正式建议。此外，轴向载荷对 SRC 柱变形能力的影响是不确定的。此外，具有现代抗震细节的 SRC 复合柱缺乏对非线性建模参数或验收标准的正式建议。本研究旨在通过实验和分析手段填补其中一些知识空白。已通过实验研究了五个 SRC 复合柱的循环行为，这些柱具有非抗震和抗震细节，但在弯曲拉伸或弯曲压缩模式下失败。测试结果表明，具有非抗震细节的张力控制 SRC 柱可以承受高达 6% 的漂移率，并且强度降低较小，满足现代抗震评估标准，建议无需改造。然而，发现高轴向载荷会危及具有非抗震细节（2% 峰值载荷漂移能力）的压缩控制 SRC 柱的漂移能力，导致过早的轴向失效。测试结果表明，有可能放宽 ACI 318-19 对具有抗震细节的张力控制 SRC 柱的约束要求。已经开发了具有抗震和非抗震细节的 SRC 组合柱过去循环试验的数据库。对数据库响应参数趋势进行了分析和比较。根据目前的测试结果和数据库趋势，提出了用于旧建筑物中具有非抗震细节的 SRC 柱的新漂移和延性能力表达式。此外，根据当前的测试结果和数据库趋势，提出了新的 ASCE 41-17 式下界非线性建模参数，用于具有非抗震细节的受弯控制 SRC 组合柱，用于基于性能的地震评估。