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Steel and Composite Structures
  Volume 50, Number 4, February 25 2024 , pages 419-428
DOI: https://doi.org/10.12989/scs.2024.50.4.419
 


Flexural performance of composite beams with open-web π-shaped steel partially-encased by concrete
Liusheng Chu, Yunhui Chen, Jie Li, Yukun Yang, Danda Li and Xing Ma

 
Abstract
    Prefabricated partially-encased composite (PEC) structural component is widely used in construction industry due to its superior structural performance and easy assembly characteristic. However, the solid web in traditional PEC components tends to split concrete into two halves, thus potentially reduces structural integrity and requires double concrete pouring. To overcome the above disadvantages, a new PEC beam with open-web π-shaped steel is proposed in this paper. Four open-web PEC beams with varying sectional height, flange thickness and web void rate were constructed and tested under flexural loads. During experimental tests, all beams exhibited typical flexural failure modes with strong moment capacities and excellent ductility. Owing to the unique construction form of web opening, steel-concrete bonding properties were enhanced and very small relative steel-concrete slips were observed. Experimental results also showed that the flexural capacity of such PEC beams increased with the increase of the sectional height and flange thickness, while was not affected by the web void rate. At last, a flexural capacity formula of the open-web PEC beam was proposed based on the whole section plastic rule. The formula results agreed well with experimental results.
 
Key Words
    flange thickness; flexural capacity; open-web π-shaped steel; Partially-Encased Composite (PEC) beams; prediction formula; sectional height; web void rate
 
Address
Liusheng Chu and Yunhui Chen:School of Civil Engineering, Zhengzhou University, 450001, Zhengzhou, China

Jie Li:Sanda University, 201209, Shanghai, China

Yukun Yang:Shanghai Jieyi Architectural Consulting Firm, 202150, Shanghai, China

Danda Li and Xing Ma:University of South Australia, SA 5095, Adelaide, Australia
 

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