為了探討實際鋼構建築中複合鋼承樓版於自然火災下之結構行為，本研究團隊興建一棟一層樓高、兩跨×兩跨之實尺寸鋼構實驗屋，並利用此鋼構實驗屋內兩個等面積的對角區間，隔間規畫出兩個相同的火災實驗用區劃空間，分別進行兩次鋼構實驗屋的現地大型火災實驗，藉以研究耐火鋼梁實際應用於鋼構建築中樓版系統之耐火能力，吾人特別在一個區劃空間的複合鋼承樓版下方採用以普通鋼製作的小梁，此為對照組SD1試體，另一個區劃空間的複合鋼承樓版下方則採用以耐火鋼製作的小梁，是為實驗組SD2試體，兩組試體分別被施以相同的靜載重、活載重和火載重，並分別進行兩次單一開口區劃空間之自然火災實驗。兩次火害實驗結果顯示：含耐火鋼小梁的SD2樓版試體之最大變位明顯小於含普通鋼小梁的SD1樓版試體，而火害中SD2樓版試體中心最大變位為SD1樓版中心最大變位的68.3%；兩試體冷卻到常溫後，SD2樓版中心殘餘變位為SD1樓版中心殘餘變位的57.2%；此外， SD2試體量測點位的平均回彈率(約為69%)高於SD1試體量測點位的平均回彈率(約為60%)；由以上結果可發現含耐火鋼小梁之SD2鋼承樓版試體除了能有效降低受到高溫火害所產生之變形外，並能以較高的回彈率，在火害後自然冷卻至常溫時產生較小的殘餘變位。

In order to investigate the structural behaviors of composite steel deck slabs in a real steel building in natural fires, we built a one-story, two bays by two bays, full-scale steel experimental building, and utilized the two diagonal regions with equal area to create two identical compartments. Two large-scale in-situ fire tests were performed respectively in the two identical compartments to study the fire-resistant performances of using fire-resistant steel beams in the floor system. We utilized the normal structural steel beams under the composite steel deck slab in one compartment, and named this control group floor specimen as SD1. In the other compartment, we employed the fire-resistant steel beams under the composite steel deck slab and named this experimental group floor specimen as SD2. The two specimens were subjected to the same dead load, live load and fire load, and two natural fire tests were separately conducted in the two single-opening compartments. The two fire test results showed that the maximum displacement of the SD2 specimen was significantly less than the SD1 specimen. The maximum displacement of the SD2 specimen was 68.3% of the maximum displacement of the SD1 specimen. After cooling back to the ambient temperature, the residual displacement of the SD2 specimen was 57.2% of the residual displacement of the SD1 specimen. It can be concluded that the SD2 specimen using fire-resistant steel beams could effectively reduce the deformation due to high-temperature fire, and could resulted in less post-fire residual displacement.

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