本研究針對兩支實尺寸H型梁-箱形柱接合之耐火鋼與普通鋼彎矩接頭試體受定載加溫的火害行為進行ABAQUS有限元素數值模擬，所得之數值結果分別與兩支試體在大型高溫爐中所進行的火害試驗結果比對，以驗證有限元素數值模型之正確性。兩支試體之有限元素數值模型皆採用三維實體元素，考慮材料與幾何的非線性影響，建立完整的螺栓接合之接觸行為，並利用順序耦合的方法來分析試體在高溫爐中受到熱與力作用的行為。在有系統地將兩支試體分析與試驗的結果詳細比對後，顯示所建立的數值模型不論在試體結構變形、局部挫屈發生位置與破壞溫度到達的模擬上，皆能有不錯的精度，證明本研究所建立之數值模型與順序耦合分析方法確實能正確模擬出H型梁-箱形柱接合之耐火鋼與普通鋼彎矩接頭試體在火害下之行為，此外，耐火鋼彎矩接頭在高溫下的表現優異，確實較普通鋼彎矩接頭在火害中能有更佳的耐火性能與時效。

This study performed the three-dimensional nonlinear finite element (FE) analyses using a general purpose finite element program ABAQUS to simulate the structural behaviors of two full-scale H-beam to box-column subassemblage specimens in fire test. In the experimental program of this study, the two specimens were tested at elevated temperatures in the furnace and under the specified constant loadings, and the moment connections of the two specimens were made of fire-resistant steel and normal steel respectively for comparison. The numerical results from ABAQUS were compared with the test results from the experimental program for validation. The three-dimensional solid elements were used in the FE modeling for the two specimens, and both material and geometric nonlinearities were considered in the FE analyses. In order to simulate the realistic behavior of the splice connections in the specimens, the detailed contact modeling was built at the contact surfaces of beam webs, splice plates and bolts. The “sequentially coupled thermal-stress analysis” was employed in this study to conduct the coupled heat transfer and structural analyses for the two specimens at elevated temperatures. After the detailed comparison, the numerical results were in good agreement with the fire test results in specimen deformations, local buckling positions and specimen failure temperatures. In addition, the test and numerical results show that the moment connection made of fire-resistant steel has much better fire-resistant performance than the normal steel moment connection.

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