Pressure-Impulse Diagram for Blast Loads Based on Dimensional Analysis and Single-Degree-of-Freedom Model

3This paper investigates the performance of a novel semi-active damping device at mitigating non-4 simultaneous multi-hazard loads. The device, termed modified friction device (MFD), has been previously 5 proposed by the authors. It consists of a variable friction system based on automotive drum brake technol-6 ogy. The device has been demonstrated in a laboratory environment, and its dynamic behavior modeled. 11show that the semi-active control cases outperforms all of the other cases for the vast majority of hazards 12 and performance indices, provided that the right control weights are utilized.

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“…The positive phase (t < t d ), is simulated using the general descending pulse model (Li and Meng 2002) 255…”

Section: Fig 7: Time History Of An Air Blast Wave Pressurementioning

confidence: 99%

Simulations of a Variable Friction Device for Multihazard Mitigation

Cao

Laflamme

Taylor³

et al. 2016

J. Struct. Eng.

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“…For a RC column (or beam-column), the level of damage (damage criterion) can be maximum bending deformation in the middle of the length [4,22,26,27,59,60], maximum shear deformation in the supports in case of shear failure [61,62], maximum rotation in the supports and connections [4] or residual axial capacity of beam column [28].…”

Section: P-i Diagrammentioning

confidence: 99%

“…Using SDOF method, the Pressure-Impulse (P-I) diagrams can be extracted for various structural members. P-I diagram is a graphical tool for assessment and preliminary design of structures and structural members under blast loads [21][22][23][24][25][26][27]. With drawing P-I diagram for a structure, a comprehensive and rapid description of structural response and the amount of damage suffered can be provided.…”

Section: Introductionmentioning

confidence: 99%

“…A more detailed description of the parameters used in Figure 1 and how to calculate them are given in Section 7 in this paper. P-I diagrams can be prepared with different analytical, numerical and experimental ways [22,25,[27][28][29][30][31]. Experimental tests for blast loading are expensive, very difficult and have legal and military limits.…”

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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“…(td), the time of rise (tr), peak load and the impulse are varied. The maximum values of each response are computed, and if they match a certain desired value of the ductility ratio, they are plotted against the normalized peak load and normalized impulse [7,8]. When a structural type is assigned to a building, pre-computed P-I curves corresponding to that structural type are assigned to the building.…”

Section: Sdof Elastoplastic Time History Analysismentioning

confidence: 99%

Simplified blast simulation procedure for hazard mitigation planning

Tadepalli¹,

Mullen²

2006

Structures Under Shock and Impact IX

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A simplified procedure for blast simulation is presented for the purpose of performing building vulnerability assessment in a framework consistent with natural hazards mitigation planning studies. A computational tool, FESIM, has been developed to perform simplified building damage simulation using a GUI driven set of algorithms. FESIM permits estimation of the dynamic response of SDOF and MDOF systems to arbitrary forcing functions, and includes a beam-column damage element for computation of nonlinear response of portal frames including laminated composite beams with varying material and laminate layout sequences. The procedure begins with the formation of stiffness and mass matrices for computation of natural modes and frequencies of the portal frames. Blast loading-time histories are then generated and SDOF elasto-plastic response is computed to determine P-I curves. Geospatial analysis is used to display blast pressure contours for scenario events affecting a complex of buildings. The damage to buildings and debris created are estimated using the P-I curves developed for the class of buildings in the complex, and losses are computed based on the occupancy, structural value and content value. The procedure is demonstrated for buildings located at the University of Mississippi being studied as part of a federally sponsored Disaster Resistant University project.

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Pressure-Impulse Diagram for Blast Loads Based on Dimensional Analysis and Single-Degree-of-Freedom Model

Cited by 156 publications

References 9 publications

Simulations of a Variable Friction Device for Multihazard Mitigation

Simulations of a Variable Friction Device for Multihazard Mitigation

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

Simplified blast simulation procedure for hazard mitigation planning

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