本研究主要利用三維非線性有限元素程式模擬H形（H-Shaped）彎矩接頭鋼構架在高溫火害下之結構行為，並利用ISO 834升溫曲線將H形鋼構架進行統一升溫。本論文主要分為兩部份，首先進行H形鋼構架在高溫火害下參數比較之數值模擬，探討梁載重、梁長度、初始冷卻溫度、梁端軸向束制、梁端旋轉束制等五種參數對於H形彎矩接頭鋼構架在高溫火害下結構行為之影響，並觀察整體鋼構架在升溫過程中彎矩接頭受力變化的情形，以及鋼梁發生懸垂效應後，鋼梁與彎矩接頭的破壞模式，藉此瞭解梁柱彎矩接頭構架在高溫火害下的破壞機制；此外，本論文更利用此破壞機制研究所獲得之結論，積極利用耐火鋼和其他補強方法針對梁柱彎矩接頭構架進行高溫補強，並探討這些補強方法對於整體鋼構架耐火性能提升之可行性。研究結果顯示：加強梁柱彎矩接頭在高溫下的強度將可抑制鋼梁在高溫下的撓度，進而提高鋼梁進入懸垂效應的破壞溫度，直接提升鋼梁的耐火性能；本論文所研究的補強方式包括：梁段式補強、複合梁式補強、蓋板式補強、側板式補強、加勁板式補強等五種，數值模擬結果顯示：梁全段使用耐火鋼可達到最好的耐火能力，但在考慮成本下，採用部分耐火鋼梁段補強，可獲得較佳的經濟效益。

This study employed three-dimensional nonlinear finite-element program to simulate the structural behaviors of H-shaped steel moment connection frames at elevated temperatures using ISO-834 temperature-time heating curve. There were two parts in this thesis. In the first part of this thesis, the numerical simulations of various parameter comparisons were implemented to investigate the influences of the five parameters, including beam loading, beam length, initial cooling temperature, axial restraint of beam and beam end rotational restraint, to the structural behaviors of H-shaped steel frames at elevated temperatures. The internal force variations of moment connections at elevated temperatures and the failure modes of moment connections after catenary effect were carefully examined to understand the failure mechanisms of steel moment connection frames in fire. In the second part of this thesis, the conclusions from failure mechanism study were utilized to strengthen the steel moment connections in high temperatures. The feasibility of using fire-resistant steel and the other high temperature strengthening methods to improve the fire-resistant performance of the whole steel frame were studied by finite element simulations. The numerical simulation results showed that strengthening the moment connection in high temperatures can reduce the beam deflection in high temperatures and increase the failure temperature and fire-resistant performance of steel beam. Five high temperature strengthening methods, including hybrid section method, hybrid beam method, cover plate method, side plate method and stiffness plate method, were considered in this thesis. The numerical simulation results showed that using fire-resistant steel for the whole beam can achieve the best fire-resistant performance. In order to reduce the cost, the more economical way can be attained by using fire-resistant steel in the two beam end sections.

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