Investigation on a mitigation scheme to resist the progressive collapse of reinforced concrete buildings

doi:10.1007/s11709-012-0181-7

Front Struc Civil Eng

2012, Vol. 6

Issue (4) : 421-430 https://doi.org/10.1007/s11709-012-0181-7

RESEARCH ARTICLE

Investigation on a mitigation scheme to resist the progressive collapse of reinforced concrete buildings

Iman TABAEYE IZADI(

), Abdolrasoul RANJBARAN

Department of Civil Engineering, Faculty of Engineering, University of Shiraz, Shiraz, Iran

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Abstract

This study presents the investigation of the approach which was presented by Thaer M. Saeed Alrudaini to provide the alternate load path to redistribute residual loads and preventing from the potential progressive collapse of RC buildings. It was proposed to transfer the residual loads upwards above the failed column of RC buildings by vertical cables hanged at the top to a hat steel braced frame seated on top of the building which in turn redistributes the residual loads to the adjacent columns. In this study a ten-storey regular structural building has been considered to investigate progressive collapse potential. Structural design is based on ACI 318-08 concrete building code for special RC frames and the nonlinear dynamic analysis is carried out using SAP2000 software, following UFC4-023-03 document. Nine independent failure scenarios are adopted in the investigation, including six external removal cases in different floors and three removal cases in the first floor. A new detail is proposed by using barrel and wedge to improve residual forces transfer to the cables after removal of the columns. Simulation results show that progressive collapse of building that resulted from potential failure of columns located in floors can be efficiently resisted by using this method.

Keywords prevent progressive collapse alternate load path reinforced concrete buildings nonlinear dynamic retrofitting cable steel hat braced frame barrel and wedge

Corresponding Author(s): TABAEYE IZADI Iman,Email:iman_t_izadi@yahoo.com

Issue Date: 05 December 2012

Cite this article:

Iman TABAEYE IZADI,Abdolrasoul RANJBARAN. Investigation on a mitigation scheme to resist the progressive collapse of reinforced concrete buildings[J]. Front Struc Civil Eng, 2012, 6(4): 421-430.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-012-0181-7
https://academic.hep.com.cn/fsce/EN/Y2012/V6/I4/421

Tab.1 Material properties

Tab.2 Design loads of the building

Tab.3 Beam types of assumed building

Tab.4 Column types of assumed building

Tab.5 Reinforcement of column section

Tab.6 Cables and bracing frame properties

Tab.7 Bracing steel frame sections

Fig.1 The assumed building plan

Fig.2 The view of the hat braced frame utilized in the mitigation scheme

Fig.3 Steel plates are fabricated and welded to form a seating base to hang beam ends by the cables

Fig.4 Typical barrel and wedges

Fig.5 Forces acting on hanging seat, barrel, wedge and the cable

Tab.8 Moment-rotation curve of plastic hinges

Fig.6 A typical plan view of this building that shows the location of failed columns

Fig.7 The elevation view of the building before and after setting the cables and the hat braced frame

Fig.8 A graphical representation of the hinge definition for the beams

Fig.9 The maximum downward displacement at the point above the removed column

Fig.10 The downward displacement after removing the C3 column in the first storey for the building without the mitigation scheme

Fig.11 The downward displacement after removing the C3 column in the first storey for the building with the mitigation scheme

Fig.12 The plastic hinge formation of the model structure

Fig.13 The maximum developed forces in the cables at a point at the top of the building and just beneath the hat braced frame

Fig.14 The effect of the cables’ diameter and elastic modulus on vertical displacement above the failed columns

Fig.15 The effect of the cables’ diameter and elastic modulus on developed loads in cables

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