Advanced Steel Construction

Vol. 16, No. 4, pp. 321-327 (2020)



Chao Gong 1, Zhao-Xin Hou 1, Guo-Zhong Cheng 2, *, Gang Wang 1 and Y. Frank Chen 2

1 Central Research Institute of Building and Construction Co., Ltd, Beijing 100088, China.

2 Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University), Ministry of Education, Chongqing 400045, China

* (Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 21 September 2019; Revised: 29 July 2020; Accepted: 10 August 2020




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A new composite slim floor system with voided RC slab is proposed, where the precast RC slab is used as the structural component as well as the permanent formwork, with the large voids achieved by light-weight fillers introduced to reduce the slab weight. The overlapping rebars pass through the web openings of steel beam, thus enhancing the interaction between the RC slab and steel beam. As a pilot study of the proposed floor system, the bending behavior of the new composite slim beam was investigated experimentally on four specimens. The full interaction between the RC slab and steel beam is demonstrated by the test and finite element analysis results. In addition, a calculation method for bending capacity is proposed.



Composite slim floor, Biaxial-hollow slab, Asymmetric steel beam, Bending capacity


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