本論文主要是利用三維非線性有限元素程式，進行梁柱剪力接頭構架之高溫數值模擬，探討不同載重、梁長、初始冷卻溫度、剪力片厚度、螺栓孔數和鋼板邊界水平距離等五種參數對於整體梁柱剪力接頭構架在高溫火害下結構行為之影響，並觀察整體構架在升溫過程中剪力接頭受力變化的情形與鋼梁發生懸垂效應後構架與接頭的破壞模式，進而歸納出梁柱剪力接頭構架在高溫火害下的破壞機制，此外，藉由此破壞機制研究所獲得之結論，本論文更積極利用耐火鋼和其他接頭補強方法針對梁柱剪力接頭構架進行補強，並探討這些補強方法對於構架耐火性能提升之可行性，找出最具有經濟效益之補強方法。研究結果顯示：鋼梁在高溫下之勁度對於剪力接頭構架之耐火性能影響甚鉅，提升鋼梁在高溫下的勁度將可降低鋼梁在高溫變形下的撓度，進而提升鋼梁進入懸垂效應的破壞溫度，間接提升構架剪力接頭的耐火性能，若只增強剪力接頭處之強度，對於整體構架耐火性能的提升有限，另外若將耐火鋼補強於鋼梁中點處，將能大幅提升剪力接頭構架在高溫下之耐火性能。

This thesis utilized three-dimensional nonlinear finite-element program to perform numerical simulations of steel beam-to-column shear connection frames at elevated temperatures. The influences of five kinds of parameters, including beam loading, beam length, initial cooling temperature, shear plate thickness, bolt number and horizontal edge distance of bolt hole, to the structural behaviors of shear connection frames at elevated temperatures were discussed. The internal force variations of shear connections at elevated temperatures and the failure modes of shear connection frames after the occurrence of catenary effect were carefully investigated to understand the failure mechanisms of shear connection frames in fire. This thesis also employed fire-resistant steel and the other methods to strengthen the shear connection frames in high temperatures using the findings from failure mechanism study. The feasibility of using these high temperature strengthening methods to improve the fire-resistant performance of shear connection frames were studied through finite element simulations. The numerical simulation results showed that the stiffness of steel beam in high temperatures significantly affected the fire-resistant performance of shear connection frame. Improving the stiffness of steel beam reduced the beam deflection in high temperatures and therefore increased the failure temperature of steel beam, which is defined by the high temperature entering catenary effect, and fire-resistant performance of shear connections. Only strengthening the shear connections had limited fire-resistant improvement for the whole steel frame. Besides, using fire-resistant steel in the middle section of a steel beam greatly enhanced the fire-resistant performance of shear connection frame in high temperatures.

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