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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. Struct. Civ. Eng.    2019, Vol. 13 Issue (6) : 1432-1445    https://doi.org/10.1007/s11709-019-0566-y
RESEARCH ARTICLE
Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed blast pressure
Yonghui WANG1,2(), Ximei ZHAI1,2
1. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China
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Abstract

The curved steel-concrete-steel (SCS) sandwich shell was recently proposed to resist blast loading and it showed better blast resistant performance as compared to flat SCS sandwich shell via developing compressive force along the shell. In this paper, a dimensionless Pressure-Impulse (P-I) diagram was constructed as a convenient tool to predict the damage level of curved SCS sandwich shell subjected to uniformly distributed blast loading. The curved SCS sandwich shell was equivalent to a single-degree-of-freedom (SDOF) system and the equation of motion was established by employing the Lagrange’s equation. To construct the dimensionless P-I diagram, the energy balance method was utilized to yield the pressure and impulse asymptotes and the responses in the dynamic response regime were obtained via employing the SDOF method. Then, the finite element method was employed to validate the developed dimensionless P-I diagram. Finally, the procedures of using the constructed dimensionless P-I diagram to quickly conduct the blast resistant design of curved SCS sandwich shell were presented.

Keywords blast loading      curved steel-concrete-steel sandwich shell      Pressure-Impulse diagram      single-degree-of-freedom method      finite element analysis     
Corresponding Author(s): Yonghui WANG   
Just Accepted Date: 26 July 2019   Online First Date: 23 September 2019    Issue Date: 21 November 2019
 Cite this article:   
Yonghui WANG,Ximei ZHAI. Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed blast pressure[J]. Front. Struct. Civ. Eng., 2019, 13(6): 1432-1445.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-019-0566-y
https://academic.hep.com.cn/fsce/EN/Y2019/V13/I6/1432
Fig.1  Curved SCS sandwich shell as blast resistant wall.
Fig.2  Quarter FE model of curved SCS sandwich shell.
Fig.3  Simplified FE model of shear connectors.
span width rise height steel plate thickness concrete depth shear connector diameter shear connector spacing
1200 1200 300 3 70 10 200
Tab.1  Geometry of curved SCS sandwich shell (unit: mm)
density (kg/m3) compressive strength (MPa) shear modulus (GPa) bulk modulus (GPa)
2310 35 12.06 13.21
Tab.2  Material properties of concrete in FE analysis
Fig.4  True stress–effective plastic strain curve for mild steel.
Fig.5  Comparison of FE predictions with test results.
Fig.6  Comparison of failure modes: (a) test observation and (b) FE prediction.
Fig.7  Details of SCS sandwich beam (unit: mm).
Fig.8  Load-displacement response of SCS sandwich beam.
fyP (MPa) fuP (MPa) fyB (MPa) fuB (MPa) fcu (MPa)
384 507 541 566 58
Tab.3  Material properties of steel and concrete in Ref. [50]
Fig.9  Simplification  of curved shell to an arch.
Fig.10  Geometry of arch.
Fig.11  Deflection shape with varying angle a.
Fig.12  Effect of a and h/R on the strain error.
Fig.13  Relationship between (h/R)max and angle a.
Fig.14  Geometry of curved SCS sandwich shell. 
Fig.15  Typical P-I diagram.
Fig.16  Dimensionless P-I diagram from analytical model.
Fig.17  Modified dimensionless P-I diagram with FE analyses.
Fig.18  Comparison of stress–strain curves from FE analyses and EC2.
Fig.19  Flow chart for determining the geometry of curved SCS sandwich shell.
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