本研究為瞭解耐火鋼圓弧切削減弱式梁柱接頭於火害前後耐震性能之差異，製作三組尺寸完全相同之實尺寸H型梁-箱型柱彎矩接頭試體，其梁柱接頭處之托梁採用耐火鋼材，並進行減弱式的圓弧切削，再分別將三組試體給予三種不同的溫度處理方式，用以模擬梁柱接頭受到高溫火害前後材質的變化(未受火害的FR-RBS-R2-EXP試體為對照組，FR-RBS-A9-EXP試體和FR-RBS-W9-EXP試體分別為受到高溫火害後空冷和水冷的實驗組試體)，最後進行三組試體的梁柱接頭反覆載重試驗。試驗結果顯示：FR-RBS-R2-EXP試體及FR-RBS-A9-EXP試體能夠通過2010年AISC的SMF梁柱接頭耐震規範之規定，兩組試體都是在層間位移角5%到達最大柱面彎矩強度，但火害後空冷之FR-RBS-A9-EXP試體在相同層間位移角之柱面彎矩強度皆低於FR-RBS-R2-EXP試體；FR-RBS-W9-EXP試體在反覆載重試驗進行至層間位移角1.5%時，托梁與連接梁連接的南翼板銲道處發生斷裂破壞，因而中止試驗，經由詳細的計算與分析，可合理推測FR-RBS-W9-EXP試體應能通過AISC耐震規範(2010)的SMF梁柱接頭規定；另外，本研究亦建立三維非線性有限元素模型來模擬三組試體，雖然數值模擬結果較保守，但模擬的破壞模式與試驗結果相近。

This research made three full-scale H-beam to box-column moment connection specimens of the same dimensions in order to understand the differences of the seismic-resistant performances before and after fire. The stub-beam in the beam-to-column connection of each specimen was made of fire-resistant steel and utilized the radius-cut type of RBS. The three specimens were treated with three different temperature treatments respectively to simulate the material changes of the beam-to-column connections before and after high-temperature fire. Finally, the three specimens named as FR-RBS-R2-EXP, FR-RBS-A9-EXP and FR-RBS-W9-EXP were tested by the same beam-to-column cyclic loading protocol. The test results show that the FR-RBS-R2-EXP specimen and the FR-RBS-A9-EXP specimen were able to meet the requirements for SMF beam-to-column connections in 2010 AISC Seismic Provisions, and reached the maximum moment strengths at the 5% inter-story drift angle. However, the moment strengths of the FR-RBS-A9-EXP specimen were lower than those of the FR-RBS-R2-EXP specimen at the same inter-story drift angles. The FR-RBS-W9-EXP specimen failed at the 1.5% inter-story drift angle due to an unexpected fracture failure occurring at the south flange weld pass connecting stub-beam and link-beam. After detailed calculation and analysis, we could reasonably infer that the FR-RBS-W9-EXP specimen might be able to meet the 2010 AISC Seismic Provisions. In addition, this research also developed a three-dimensional nonlinear finite-element models to simulate the three specimens. Though the numerical simulation results are more conservative, the simulated failure modes were similar to the test results.

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