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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front Struc Civil Eng    2012, Vol. 6 Issue (3) : 199-209    https://doi.org/10.1007/s11709-012-0168-4
RESEARCH ARTICLE
Collapse fragility assessment of steel roof framings with force limiting devices under transient wind loading
Linjia BAI, Yunfeng ZHANG()
Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, USA
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Abstract

Steel structural frame is a popular structural form to cover large-span roof space and under high winds. Either part of the roof enclosure or the entire roof structure can be lifted off a building, particularly for low sloped roofs subject to wind-induced suction force. Collapse of roof could cause severe economic loss and poses safety risk to residents in the building. The buckling of members in a steel roof frame structure, which may lead to progressive collapse, may be dynamic in nature. This paper presents a fragility analysis of the collapse of steel roof frame structures under combined static and transient wind loading. Uncertainties associated with wind load change rate and member imperfections are taken into account in this study. A numerical example based on a Steel Joist Institute (SJI) K series joist was used to demonstrate the use of force limiting devices for collapse risk mitigation. For the presented fragility assessment of steel roof collapse, a Monte Carlo method combined with response surface approach was adopted, which greatly reduces the computation time and makes the Monte Carlo simulation feasible for probabilistic collapse analysis of steel roof frame structures.

Keywords collapse      dynamic response      fragility analysis      Monte Carlo simulation      wind load     
Corresponding Author(s): ZHANG Yunfeng,Email:zyf@umd.edu   
Issue Date: 05 September 2012
 Cite this article:   
Linjia BAI,Yunfeng ZHANG. Collapse fragility assessment of steel roof framings with force limiting devices under transient wind loading[J]. Front Struc Civil Eng, 2012, 6(3): 199-209.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-012-0168-4
https://academic.hep.com.cn/fsce/EN/Y2012/V6/I3/199
Fig.1  Hysteresis model of buckled steel axial member and force limiting device (FLD)
Fig.2  Transient wind speed record from a downburst event
Fig.3  Planar joist roof frame model for numerical study (SJI K series No. 9 joist)
(a) Elevation view (Case 1: No FLD); (b) Section A-A; (c) planar joist roof frame with FLDs
Fig.4  Frame response to transient wind load
(a) Node L3 displacement time history; (b) reaction force (in vertical direction) at support node L1; (c) global hysteresis behavior
Fig.5  Hysteresis loops of element U1L1
Fig.6  Locations of sample and verification points of response surface (solid dots: sample points; circle: verification points)
Evaluation pointImperfection rate δ/%Wind load change rate /(kPa·min-1)Collapse wind pressure /kPaEstimate from RS /kPaError /%
No FLD10.7350.851.2681.2720.31
20.2650.851.4431.4400.19
30.51.01.3131.3180.51
40.50.71.3451.3470.20
W/ FLD10.7350.851.4751.4820.45
20.2650.851.6401.6460.35
30.51.01.5301.5380.53
40.50.71.5401.5530.81
Tab.1  Accuracy estimation for collapse capacity response surface (±)
Evaluation pointImperfection rate δ/%Wind load change rate /(kPa·min-1)Collapse wind pressure /kPaEstimate from RS /kPaError/%
No FLD10.030.851.6551.6043.1
20.51.161.2701.2941.9
30.50.541.3791.3660.9
40.970.851.2411.2682.2
W/ FLD10.030.851.8351.7822.9
20.51.161.5101.5301.3
30.50.541.5901.5591.9
40.970.851.4311.4551.7
Tab.2  Accuracy estimation for collapse capacity response surface (±2)
Sample pointsImperfection rate δ/%Wind load change rate /(kPa·min-1)Collapse wind pressure/kPa
No FLDsWith FLDs
10.50.851.3311.546
20.50.591.3611.556
30.51.111.3031.533
40.90.851.2621.457
50.10.851.5521.740
60.2650.71.4611.656
70.2651.01.4151.635
80.7351.01.2621.480
90.7350.71.2851.487
Tab.3  Sample points used to construct response surface
Fig.7  Response surface for collapse capacity (Case of No FLDs)
Fig.8  Response surface for collapse capacity (Case w/ FLDs)
Fig.9  Histograms of roof collapse for two cases
Fig.10  Collapse fragility curves for two cases (No FLD and w/ FLD)
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