Techno Press
You logged in as Techno Press

Steel and Composite Structures
  Volume 39, Number 4, May25 2021, pages 383-399
DOI: https://doi.org/10.12989/scs.2021.39.4.383
 


Anti-collapse performance analysis of unequal span steel–concrete composite substructures
Bao Meng, Liangde Li, Weihui Zhong, Zheng Tan and Yuhui Zheng

 
Abstract
    In the study, three 1:3-scale unequal span steel–concrete composite substructures with top-seat angle and double web angle connection were designed and identified as specimens GTSDWA-0.6, GTSDWA-1.0, and GTSDWA-1.4. Pseudo-static tests and refined numerical model analysis were conducted to examine the anti-progressive collapse performance of a semi-rigid steel–concrete composite substructure. The results indicated that the failure modes of the three specimens revealed that the fracture occurred in the root of the long leg of the top/seat angle in tension at the connection. With increases in the span ratio of the left and right composite beams, the bearing capacities of the composite substructures decreased, and the corresponding displacement increased. With respect to GTSDWA-0.6 and GTSDWA-1.4, the resistance due to the short composite beam corresponded to 62% and 60%, respectively, and the total resistance provided by the short composite beam exceeded that of the long composite beam. With respect to GTSDWA-1.0, the resistance due to the left and right composite beams was similar. All three specimens underwent the flexure mechanism and flexure–axial mixed mechanism stages. They resisted the external load mainly via the flexure mechanism. Moreover, the addition of stiffeners on both sides of the top and seat angles is advantageous in terms of improving the collapse resistance and ductility of unequal span composite substructures.
 
Key Words
    steel–concrete composite substructure; semi-rigid connection; progressive collapse; performance analysis; unequal span
 
Address
Bao Meng: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi'an 710055, China
Liangde Li, Weihui Zhong, Zheng Tan and Yuhui Zheng: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2021 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: info@techno-press.com