（1 华润置地（宁波）有限公司， 宁波 315000；2 上海市建筑科学研究院上海市工程结构安全重点实验室， 上海 200032；3 东南大学建筑设计研究院有限公司， 南京 210096； 4 东南大学土木工程学院， 南京 210096）

［摘要］为研究带约束预应力混凝土空心板整浇楼面受火后加固修复方法，共进行了3块带约束预应力混凝土空心板整浇楼面的对比试验研究，其中1块为未受火对比试件，1块为受火60min后未加固试件，1块为受火60min后粘贴CFRP布和增设钢梁加固试件。结果表明：受火60min后试件极限承载力较未受火对比试件降低13.9%。受火60min后加固试件的极限承载力和初始抗弯刚度显著提高；与受火后未加固试件相比，极限承载力提高40.3%、初始抗弯刚度提高26.1%，但破坏挠度降低52.1%、延性降低59.1%；与未受火对比试件相比，极限承载力提高20.8%，破坏挠度降低60.6%；CFRP布和钢梁的加固作用在后期贡献较大。运用ABAQUS软件对试件的受力性能进行了有限元模拟，模拟结果和试验结果吻合较好，可用于受火后该类结构的鉴定评估和加固修复设计。

［关键词］预应力混凝土空心板； 整浇楼面；  极限承载力； 加固修复； 受火试验

中图分类号：TU375-1文献标识码：A文章编号：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

*国家重大科技专项课题（2016YFC0701306），上海市科委标准项目（17DZ2202600）。

通讯作者：许清风，博士，教授级高级工程师，Email: xuqingfeng73@163.com。