Advanced Steel Construction

Vol. 15, No. 2, pp. 192-202 (2019)

 MITIGATION OF FIRE-INDUCED PROGRESSIVE COLLAPSE OF

STEEL FRAMED STRUCTURES USING BRACING SYSTEMS

 

Jian Jiang 1 and Guo-qiang Li 2, *

1 State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

2 State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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

Received: 27 July 2018; Revised: 14 November 2018; Accepted: 18 November 2018

 

DOI:10.18057/IJASC.2019.15.2.9

 

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ABSTRACT

This paper investigates disproportionate collapse resistance of braced steel frames exposed to fire. The influence of type, number and location of bracing systems on the global collapse is studied. The results show that using braces can enhance the fire-induced collapse resistance by 1 hour. For a single-compartment fire, the collapse can be prevented by using either horizontal or vertical braces. The presence of vertical braces at interior bays is essential to prevent collapse. It is neces sary to use a combined horizontal and vertical bracing to prevent collapse for interior multi -compartment fires. For multi-compartment fires at corner, fire protections are required for the perimeter columns to prevent global collapse. Slabs have beneficial influence on the collapse resistance which can be resisted by a tensile ring around the perimeter of the heated slab, and also by tensile yield lines extended to the frame edge. It is suggested to ensure the fire partition at corner regi on to avoid fire spread to adjacent compartments since spreading of corner fires are more dangerous than that of interior fires.

 

KEYWORDS

Disproportionate collapse, Steel framed structure, Horizontal bracing, Vertical bracing, Compartment fire, Combination of bracing

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