本研究主要探討以SM570等級高性能鋼鋼材製成的BH型鋼柱試體於火害前與火害後之耐震性能差異，因此特別製作三組材質與尺寸皆相同的半柱試體，對三組試體進行不同溫度處理 (即：放置常溫下的對照組R2試體、經900℃高溫後自然冷卻的A9試體、經900℃高溫後水中冷卻的W9試體)，研究SM570等級鋼柱於高溫火害前後的機械性質變化，另外針對三組試體將施加相同軸壓力並進行相同反覆側推歷程獲取數據，比對鋼柱試體於火害前後對其耐震能力影響，發現未受火害之R2試體與經900℃高溫後水中冷卻的W9試體符合美國耐震規範AISC 341-16之SMF梁柱接頭達到4%層間位移角和0.8Mp彎矩強度的規定經900℃高溫後自然冷卻的A9試體，因鋼材強度大幅減弱，不符合美國耐震規範AISC 341-16中SMF梁柱接頭的規定。

This study mainly investigated the pre-fire and post-fire seismic-resistance differences of the BH steel column specimens made of SM570 grade high performance steel. Therefore, three half-column specimens with the same material and dimensions were made. The three specimens were treated with three different temperature treatments respectively, and were named as R2, A9 and W9. R2 was the specimen without fire damage. A9 was the specimen heated to 900°C high temperature and then air-cooled to room temperature. W9 was the specimen heated to 900°C high temperature and then water-cooled to room temperature. The three specimens were subjected to the same axial compressive load and the same lateral cyclic loading protocol to obtain the pre-fire and post-fire seismic-resistance differences of the SM570 steel half-columns. Experiment results showed that the R2 specimen and the W9 specimen could reach the 4% interstory drift and 0.8Mp moment strength, and therefore met the the special moment frame (SMF) beam-to-column connection requirements in the AISC 341-16 seismic provisions. Due to the post-fire steel strength was decreased greatly, the A9 specimen did not meet the requirements of SMF beam-column connections in the AISC 341-16 seismic provisions.

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