本研究針對國內常用之H形鋼梁接箱型鋼柱接頭，透過實尺寸接頭耐震試驗與有限元素分析，探討梁腹開雙條孔對接頭受震與受火行為的影響。結果顯示，雙長條開孔減弱式接頭經反覆載重試驗到最大層間變位角4%兩個迴圈完成時，柱面彎矩強度仍可超過其鋼梁標稱塑性彎矩強度之80%，符合目前鋼結構設計規範之耐震設計要求。此外，梁腹開孔減弱式設計也提供接頭較好的塑性行為發展空間，使塑鉸發生在梁腹開孔位置、遠離柱面，故接頭進入塑性階段後柱面銲道附近上下翼板應力分佈較為均勻，避免應力集中所致破壞問題。有限元素分析進一步顯示，無論梁腹開孔與否，高溫下接頭破壞潛勢最高的位置是在柱面銲道外側梁下翼板。高溫800oC作用下，梁腹無開孔傳統式鋼梁柱接頭受熱在柱面附近變形被嚴重束制而產生應力集中，此大幅地提高接頭破壞潛勢且相關影響恐不亞於受震反覆加載。另一方面，梁腹開孔減弱式設計則提供空間緩解了接頭受熱變形的影響，因而有效地降低高溫破壞的可能。

This study evaluates the effects of beam-web openings on the seismic and fire behaviors of steel beam-to-column connections by full-scale cyclic loading tests and finite element analyses. Two stadium-shaped openings were designed and adopted in the beam web of a SN490B steel H-beam-to-box-column. The test results show that when subjected to cyclic loading with a drift ratio of 4% , the connection can sustain more than 80% of the nominal plastic bending moment of the steel beam. The connection performance met the seismic requirement of the AISC specification. In addition, the beam web-openings provided a space for the connection to develop better plastic behavior, removing the plastic hinge away from the column face, reducing the stress in the adjacent beam flanges. The results of finite element analyses further indicate that, high temperature may cause stress concentration in the bottom flanges of the connections without and with beam web-openings. For the conventional connection without beam-web openings, the 800 oC high temperature can greatly increase the potential of fracture, just like the seismic testing. On the other hand, the beam-web openings can provid a space to alleviate the high temperature stress, and thus can effectively reduce the possibility of connection fracture.

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