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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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2018 Impact Factor: 1.272

Front Arch Civil Eng Chin    2011, Vol. 5 Issue (3) : 278-293    https://doi.org/10.1007/s11709-011-0120-z
RESEARCH ARTICLE
Analysis and design of steel-concrete composite sandwich systems subjected to extreme loads
Kazi Md Abu SOHEL, Jat Yuen Richard LIEW(), Min Hong ZHANG
Department of Civil Engineering National University of Singapore, Singapore
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Abstract

This paper presents the design guide based on analytical, numerical and experimental investigation of Steel-concrete-steel (SCS) sandwich structural members comprising a lightweight concrete core with density ranged from 1300 to 1445 kg/m3 subjected to static, impact and blast loads. The performance of lightweight sandwich members is also compared with similar members with normal weight concrete core and ultra high strength concrete core (fc = 180 MPa). Novel J-hook shear connectors were invented to prevent the separation of face plates from the concrete core under extreme loads and their uses are not restricted by the concrete core thickness. Flexural and punching are the primary modes of failure under static point load. Impact test results show that the SCS sandwich panels with the J-hook connectors are capable of resisting impact load with less damage in comparison than equivalent stiffened steel plate panels. Blast tests with 100 kg TNT were performed on SCS sandwich specimens to investigate the key parameters that affect the blast resistance of SCS sandwich structure. Plastic yield line method is proposed to predict the plastic capacity and post peak large deflection of the sandwich plates. Finally, an energy balanced model is developed to analyze the global behavior of SCS sandwich panels subjected to dynamic load.

Keywords blast load      composite structure      impact load      lightweight concrete      sandwich plate      J-hook connector     
Corresponding Author(s): LIEW Jat Yuen Richard,Email:ceeljy@nus.edu.sg   
Issue Date: 05 September 2011
 Cite this article:   
Kazi Md Abu SOHEL,Jat Yuen Richard LIEW,Min Hong ZHANG. Analysis and design of steel-concrete composite sandwich systems subjected to extreme loads[J]. Front Arch Civil Eng Chin, 2011, 5(3): 278-293.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-011-0120-z
https://academic.hep.com.cn/fsce/EN/Y2011/V5/I3/278
Fig.1  Separation of face plate from core when the sandwich beams are subjected to impact. (a) Beam with overlap shear studs; (b) beam with angle shear connectors
Fig.2  Bi-steel panel []
Fig.3  (a) Welding of J-hook shear connector by automatic welding gun; (b) Assembly of SCS panel with J-hook connectors
Fig.4  Example of usage of SCS sandwich system. (a) Offshore structures in arctic region; (b) blast barrier wall; (c) free standing automobile barrier
Fig.5  SCS sandwich system with J-hook connectors
Fig.6  Force distribution in the section at fully plastic stage
Fig.7  Formation of yield-line mechanism of sandwich slab subjected to concentrated load at center
Fig.8  Punching shear in SCS sandwich slab. (a) Typical punching cone in SCS sandwich; (b) control perimeter for punching shear
specimen no.t/mmd/mmhc/mmconcrete typefc/MPaconcrete density/(kg·m-3)
SLCS6-805.961080LWC27.01420
SLFCS6-805.961080LWFC28.51445
SLFCS6-1005.9610100LWFC28.51445
SLFCS6-100(12)5.9612100LWFC28.51445
SCS4-1003.9810100NWC57.22370
SCS6-1005.9610100NWC57.22370
SCFS6-1005.9610100NWFC59.02400
SCFS8-100(12)7.9812100NWFC59.02400
Tab.1  Properties of the SCS sandwich slab specimens
slab Ref.ntσy/MPaPR/kNMpl/(kN-m)Fp/kNFp-exp/kNFp-exp/Fp
SLCS6-8012131519.022.12502521.01
SLFCS6-8012131522.325.92933021.04
SLCFS6-10012131522.331.93613641.01
SLCFS6-100(12)12131528.040.14534541.01
SCS4-10012127533.048.45825180.89
SCS6-10012131533.052.55936201.05
SCFS6-10012131534.655.56227291.17
SCFS8-100(12)12135548.578.68898921.01
Tab.2  Comparison of SCS sandwich slab test results with predicted flexural load according to Eq. (9)
slab Ref.Ft/kNncpVpun/kNFp/kNFp-exp/kNFp/Vpunpredicted mode of failure
SLCS6-801642722502520.92flexural
SLFCS6-801844882933020.60flexural
SLCFS6-1001846383613640.57flexural
SLCFS6-100(12)2546664534540.68flexural
SCS4-1002244485825181.30punching-shear
SCS6-1002244745936201.25punching-shear
SCFS6-1002346856227290.91flexural
SCFS8-100(12)4047978898921.12punching-shear
Tab.3  Calculated punching capacity (by Eqs. (10) to (14)) of the slabs
Fig.9  SCS sandwich slab under static load. (a) Test set-up; (b) at the end of the test
Fig.10  Experimental load-deflection curves. (a) Sandwich slabs with normal weight concrete core; (b) sandwich slabs with light weight concrete core
Fig.11  Different stages of behavior of SCS sandwich slabs under concentrated load
panelt/mmhc/mmconcretefc/MPaEc/GPaρ/(kg·m-3)fy/MPaS/mmdj/mm
A5.98100LWC23.0111400276.010010
B5.98100LC43.0161300276.010010
SP11.96-276.0
Tab.4  Panel specifications
Fig.12  (a) Concrete pumping into the panel; (b) composite panel after concrete casting
Fig.13  Impact test set-up. (a) Sandwich panel test set-up; (b) stiffener steel plate set-up; (c) potentiometers attachment to the specimen
panelt/mmhc/mmfc/MPaVim/(m·s-1)wmax/mmyp/mm
A5.9810023.07.96142.7106.5
B5.9810043.07.9692.563.5
SP11.966.30156.0116.0
Tab.5  Impact test results
Fig.14  (a) Impact test set-up; (b) SCS sandwich panel after impact load; (c) stiffened steel panel (SP) after impact
Fig.15  Impact pressure distribution around the impact point
Fig.16  (a) Permanent deformed shape of the panels; (b) force-displacement curves
test no.specimentftsteconcrete typedj/mmyp/mmfailure/response modes
1CSP43.03160flexural local buckling
SCSN441.53NWC1027flexural
2SCSN31.53NWC1053flexural
SCSNE31.53NWC1031flexural
3SCSL31.53LWC1086shear
SCSH31.53HSC1081flexural
Tab.6  Specimens subject to blast load
concretedensity/(kg·m-3)compressive strength/MPatensile strength/MPaYoung’s modulus/GPapoisson ratio
NWC230035.33.519.50.19
LWC125020.12.011.20.24
HSC2700184.17.062.30.26
Tab.7  Concrete material properties
Fig.17  Configurations and notations of SCS sandwich specimen with connectors (a) and Cellular stiffened plate (CSP) (b)
Fig.18  Blast test setup with 100 kg TNT charge. (a) schematic; (b) actual test arrangements
Fig.19  Specimen CSP (stiffened plate on the left) and specimen SCSN4 (SCS panel on the right) after blast 1
Fig.20  (a) Specimen SCSN (left) and SCSNE (right) after blast 2; (b) specimen SCSL (left) and SCSH (right) after blast 3
Fig.21  Failure of specimen SCSL
Fig.22  (a) Deflected shape of an elastic beam; (b) idealized force-displacement curve of a beam (resistance function of a beam)
panelMpl/(kNm)Ru/kNwe/mmEimpact/(N-m)wanalysis/mmwmax-expwanalysis/wmax-exp
A13927810.239443146.8142.71.03
B1923851139443108.392.51.17
Tab.8  Comparison between analysis and experiment for impact
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