Effects of Foam Claddings for Structure Protection against Blast Loads

Ye, Z.Q.; Ma, Guowei

doi:10.1061/(asce)0733-9399(2007)133:1(41)

Cited by 41 publications

(24 citation statements)

References 10 publications

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“…At the next section, solving this differential Equation 18 by finite difference method FDM will be done [44][45][46].…”

Section: Description Of Sdof Modelmentioning

confidence: 99%

“…In the conducted studies it has been shown that equivalent SDOF system can model the behavior of steel beams and columns [6][7][8][9], slabs and walls [10][11][12] and reinforced concrete beams [13][14][15][16] under blast loading with acceptable accuracy. The SDOF method for modeling the response of retrofitted structural members in the face of blast has also been used [17,18]. When a column is under simultaneous effect of axial force and lateral load, the existence axial load due to P-δ effects, could change the affecting moments on the column.…”

Section: Introductionmentioning

confidence: 99%

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Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Izadifard¹,

Mollaei²,

Omran³

2016

Int J Adv Tech

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In this paper, moment-curvature behavior of reinforced concrete column with constant axial load is determined using finite element method and then it is introduced to a single degree of freedom (SDOF) model based on EulerBernoulli theory. Using this SDOF model, dynamic response of the RC column under the blast loading is estimated. The introduced SDOF includes secondary moments (P-δ) effects, nonlinear behavior of the material and effects of strain rate on concrete and steel materials through the time calculation of the model. Results obtained from SDOF model for transverse displacement of RC column under blast loading is compared to analysis by finite element software OPENSEES. Then, introduced SDOF method is used for drawing Pressure-Impulse (P-I) diagram of the column with considering the presence of axial compressive load. According to the results, introduced SDOF model has simple and quick computations and accuracy of predictions is acceptable.P-δ effects and overall and local damages and their impact on the P-I diagram can be evaluated. However, this method due to the high complexity, high time of calculations and the need to have enough skills and experience of using software, for extensive parametric studies isn't very appropriate.In this paper, the flexural behavior (moment-curvature) of a reinforced concrete column section using finite element software of open system for earthquake engineering simulation (OpenSees) has been determined and introduced to the calculation of SDOF analytical model in order to estimate transverse displacement response of column under simultaneous compressive axial force and lateral loading of blast. The SDOF introduced model includes the effects of secondary moments (P-δ) and also the effects of high strain rates on the behavior specifications of concrete and steel rebar. In this method, to consider the effects of the existence of column axial loading (P-δ) the concept of reduced resistance function is used. Using the introduced process, P-I dimensionless curves have been plotted for reinforced concrete column. Figure 2 shows the distribution of stress and strain in the rectangular RC section at the ultimate state. Strain distribution in the height of the section has been assumed to be linear and curvature of section (θ) is equal to the slope of this line. Also, the tensile strength of concrete has been ignored. In the figure above, f yk is the yield stress of reinforcement steel, f cu is the ultimate strength of concrete, ε cu is the ultimate strain of concrete, xu is the depth of neutral axis in the ultimate state, b is the width, h is Equivalent Single Degree of Freedom Model

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“…At the next section, solving this differential Equation 18 by finite difference method FDM will be done [44][45][46].…”

Section: Description Of Sdof Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparing Pressure-Impulse Diagrams for Reinforced Concrete Columns with Constant Axial Load using Single Degree of Freedom Approach

Izadifard¹,

Mollaei²,

Omran³

2016

Int J Adv Tech

View full text Add to dashboard Cite

show abstract

“…Shock wave theory is frequently employed in delineating such crushing [14][15][16], in which the foam stress-strain relationship is idealized with the RPPL model, shown in Fig. 2, and employed in the present study to predict the foam crushing process.…”

Section: Formulation Of Continuous Graded Foam Subjected To High Velomentioning

confidence: 99%

“…Not only single layer cladding, but also double layer cladding subjected to a blast load was investigated [14]. Further, the protection efficiency of a system consisting of a blast mitigation cladding with metal foam core and protected structure subjected to a blast load was examined [15,16]. Full scale tests of aluminum foam cladding protected concrete structures subjected to blast were conducted and reported [17,18].…”

Section: Introductionmentioning

confidence: 99%