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(北京市建筑設計研究院有限公司， 北京 100045)
［摘要］超高強度鋼筋（HRB500，HRB600）以及超高強度鋼材（Q420，Q460，Q690）在實際工程中大規(guī)模應用的案例較少。以中信大廈超高層建筑為算例，分析了采用超高強度鋼筋和超高強度鋼材等強度替換鋼管混凝土巨柱-斜撐-鋼板混凝土剪力墻筒中筒結構體系中的鋼材時對結構整體性能的影響。對比了筏板、樁基礎、鋼管混凝土巨柱、斜撐、鋼板混凝土剪力墻中鋼材的用量變化。經分析，采用超高強度鋼筋和超高強度鋼材，可使結構在滿足規(guī)范抗震性能要求前提下，大幅減少用鋼量。因規(guī)范中鋼構件寬厚比限值對超高強鋼構件厚度影響較大，對比了中國、美國、歐洲規(guī)范中相應規(guī)定，結果表明，整體來說各國規(guī)范中的寬厚比限值處于相同量級。美國規(guī)范根據(jù)延性等級要求調整了寬厚比要求的方法，為超高強鋼替換材料時采用更為寬松的寬厚比限值提供了參考和依據(jù)。
［關鍵詞］中信大廈；超高強結構鋼；鋼管混凝土巨柱；用鋼量優(yōu)化；等強度替換；寬厚比
中圖分類號：TU318 文獻標識碼：A文章編號：1002-848X(2021)15-0023-07
Research on the application of ultra-high-strength structural steel in super high-rise building of CITIC Tower
WU Jiong, YANG Weibiao, CHANG Weihua, GONG Zhenchao, LIU Lin
(Beijing Institute of Architectural Design Co., Ltd., Beijing 100045， China)
Abstract: There are few cases of large-scale application of ultra-high-strength steel bars (HRB500, HRB600) and ultra-high-strength steel (Q420, Q460, Q690) in practical projects. Take the super high-rise building of CITIC Tower as an example, the influence on the overall performance of the structure when the steel in concrete-filled steel tube giant column-diagonal brace-steel plate concrete shear wall tube-in-tube structure system was replaced by ultra-high-strength steel bars and ultra-high-strength steel was analyzed. The changes in the amount of steel used in rafts, pile foundations, concrete-filled steel tube giant column, diagonal braces, and steel plate concrete shear walls were compared. After analysis, the use of ultra-high-strength steel bars and ultra-high-strength steel can greatly reduce the amount of steel used on the premise that the structure meets the seismic performance requirements of the specification. Because the width-thickness ratio limit of steel members in the specification has a greater impact on the thickness of ultra-high-strength steel members, the corresponding regulations in Chinese American and Europe codes were compared. The results show that the width-thickness ratio limits in national standards are of the same magnitude. The American codes adjusted the method of width-thickness ratio requirements according to ductility grade requirements, and provide a reference and basis for adopting a more relaxed width-thickness ratio limit when replacing materials with ultra-high strength steel.
Keywords:CITIC Tower； ultra-high-strength structural steel； concrete-filled steel tube giant column； optimization of steel consumption； equal strength substitution; width-thickness ratio
作者簡介：吳炅，碩士，工程師，Email:429387940@qq.com。
