- 摘 要
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（1 華潤置地（寧波）有限公司， 寧波 315000；2 上海市建筑科學研究院上海市工程結(jié)構(gòu)安全重點實驗室， 上海 200032；3 東南大學建筑設計研究院有限公司， 南京 210096； 4 東南大學土木工程學院， 南京 210096）
［摘要］為研究帶約束預應力混凝土空心板整澆樓面受火后加固修復方法，共進行了3塊帶約束預應力混凝土空心板整澆樓面的對比試驗研究，其中1塊為未受火對比試件，1塊為受火60min后未加固試件，1塊為受火60min后粘貼CFRP布和增設鋼梁加固試件。結(jié)果表明：受火60min后試件極限承載力較未受火對比試件降低13.9%。受火60min后加固試件的極限承載力和初始抗彎剛度顯著提高；與受火后未加固試件相比，極限承載力提高40.3%、初始抗彎剛度提高26.1%，但破壞撓度降低52.1%、延性降低59.1%；與未受火對比試件相比，極限承載力提高20.8%，破壞撓度降低60.6%；CFRP布和鋼梁的加固作用在后期貢獻較大。運用ABAQUS軟件對試件的受力性能進行了有限元模擬，模擬結(jié)果和試驗結(jié)果吻合較好，可用于受火后該類結(jié)構(gòu)的鑒定評估和加固修復設計。
［關(guān)鍵詞］預應力混凝土空心板； 整澆樓面； 極限承載力； 加固修復； 受火試驗
中圖分類號：TU375-1文獻標識碼：A文章編號：1002-848X(2020)15-0008-07
Study on bearing performance of fire damaged PC hollow-core slab integrated floor with cast-in-situ layer strengthened with CFRP sheets and steel beam
LI Mengnan1, XU Qingfeng2, CHEN Lingzhu2, HAN Chongqing3, SHAO Peng4
(1 China Resources Land (Ningbo) Limited, Ningbo 315000, China; 2 Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China; 3 Architects & Engineers Co., Ltd. of Southeast University, Nanjing 210096, China; 4 School of Civil Engineering, Southeast University, Nanjing 210096, China)
Abstract:To investigate the strengthening method of PC hollow-core slab integrated floor with constraints after fire, 3 specimens were experimentally studied, including one control specimen without fire, one specimen exposed to fire for 60min without strengthening, one specimen strengthened with CFRP sheets and steel beam after exposed to fire for 60min. The results indicated that the ultimate bearing capacity of exposed specimen for 60min decreased about 13.9% compared with the control specimen. The ultimate bearing capacity and initial bending stiffness increased apparently after strengthened with CFRP sheets and steel beam. Compared with the 60min exposed specimen without strengthening, the ultimate bearing capacity increased by 40.3% and the initial bending stiffness increased by 26.1%, but the ultimate deformation decreased by 52.1% and the ductility factor decreased by 59.1%. Compared with the control specimen, the ultimate bearing capacity increased by 20.8%, and the ultimate deformation decreased by 60.6%. The CFRP sheets and steel beam contributed greatly in the later stage. The performance of specimens was numerical simulated by ABAQUS. The finite element analysis results agreed well with the test results. It can be used for the appraisal, evaluation and strengthening design of this kind of structure after fire.
Keywords:PC hollow-core slab; integrated floor; ultimate bearing capacity; strengthening and repair； fire test
*國家重大科技專項課題（2016YFC0701306），上海市科委標準項目（17DZ2202600）。
通訊作者：許清風，博士，教授級高級工程師，Email: xuqingfeng73@163.com。
