A methodology for evaluating dynamic responses of steel columns subjected to blast load under different situations

2015 ◽  
Vol 8 (4) ◽  
pp. 265-275 ◽  
Author(s):  
Mohammad Abdallah ◽  
Bashir H. Osman
Keyword(s):  
Dynamic Responses ◽  
Blast Load ◽  
Steel Columns

scholarly journals Behaviour and Failure of Steel Columns Subjected to Blast Loads: Numerical Study and Analytical Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Haitham Al-Thairy
Keyword(s):  
Parametric Study ◽  
Analytical Approach ◽  
Numerical Study ◽  
Slenderness Ratio ◽  
Compressive Force ◽  
Design Procedure ◽  
Blast Load ◽  
Blast Loads ◽  
Steel Columns ◽  
Failure Patterns

The main objective of this study is the numerical simulation of the behaviour and failure patterns of steel columns under blast loads using the dynamic finite element package ABAQUS/Explicit. A numerical model is suggested and validated against published experimental tests on full-scale wide-flange steel columns subjected to dynamic blast loads under constant axial compressive force. Afterwards, the validated model is used to investigate the effect of important parameters on the behaviour and failure patterns of steel columns under blast pressure through an extensive parametric study. The parameters include the blast impulse, the blast energy, the blast load, the blast duration, the column boundary condition, the column slenderness ratio, and the blast direction. The conclusions extracted from this parametric study may be used to develop a thorough understanding of the behaviour and failure of steel columns subjected to blast load which, in turn, could lead to a more accurate practical design procedure. The study also presents derivations and validations of a proposed analytical approach to calculate the critical blast impulse at which a steel column losses its global stability. Comparison between the critical impulse-axial force curves obtained from the proposed equation and that extracted from numerical simulations indicates the validity and feasibility of the proposed equation.

scholarly journals Blast Test and Failure Mechanisms of Soft-Core Sandwich Panels for Storage Halls Applications

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 70 ◽  
Author(s):  
Robert Studziński ◽  
Tomasz Gajewski ◽  
Michał Malendowski ◽  
Wojciech Sumelka ◽  
Hasan Al-Rifaie ◽  
...  
Keyword(s):  
Sandwich Panel ◽  
Shear Failure ◽  
Failure Mechanisms ◽  
Sandwich Panels ◽  
Core Layer ◽  
Mineral Wool ◽  
Expanded Polystyrene ◽  
Blast Load ◽  
Steel Columns ◽  
The Core

In this paper, an experimental investigation is presented for sandwich panels with various core layer materials (polyisocyanurate foam, mineral wool, and expanded polystyrene) when subjected to a justified blast load. The field tests simulated the case for when 5 kg of trinitrotoluene (TNT) is localized outside a building’s facade with a 5150 mm stand-off distance. The size and distance of the blast load from the obstacle can be understood as the case of both accidental action and a real terroristic threat. The sandwich panels have a nominal thickness, with the core layer equal 100 mm and total exterior dimensions of 1180 mm × 3430 mm. Each sandwich panel was connected with two steel columns made of I140 PE section using three self-drilling fasteners per panel width, which is a standard number of fasteners suggested by the producers. The steel columns were attached to massive reinforced concrete blocks via wedge anchors. The conducted tests revealed that the weakest links of a single sandwich panel, subjected to a blast load, were both the fasteners and the strength of the core. Due to the shear failure of the fasteners, the integrity between the sandwich panel and the main structure is not provided. A comparison between the failure mechanisms for continuous (polyisocyanurate foam and expanded polystyrene) and non-continuous (mineral wool) core layer materials were conducted.

scholarly journals Analytical Investigation on non-linear dynamic analysis of reinforced concrete building subjected to blast loading

2021 ◽  
Vol 850 (1) ◽  
pp. 012012
Author(s):  
R. Prashanthi ◽  
S. Elavenil
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Blast Loading ◽  
Analytical Investigation ◽  
Dynamic Responses ◽  
Blast Load ◽  
Reinforced Concrete Building ◽  
Linear Dynamic ◽  
Concrete Building ◽  
Non Linear

Abstract The blast explosion causes catastrophic failure of structure both externally and internally. In this work the analytical investigation is carried out on the blast performance of the reinforced concrete building frame. Reinforced concrete building connection is vital in the Moment Resistant Frames (MRF) and they play a vital role under constant blast load. It is important to design the building for blast loading since they are subjected to large displacements. The non-linear dynamic behavior of the building by time history analysis method is performed by using SAP2000 finite element stimulation software. Blast load is idealized as the triangular pulse for single degree of freedom system and the effect of the blast load at a different standoff distances on the building element is examined. The analytical method could predict the overall flexural, non-linear shear behavior and ductile response of the building at different modes. The results of the stimulations for various failure conditions such as maximum displacement, maximum base shear and spectral acceleration as per IS 1893-2016 for non-linear dynamic responses are investigated in this study.

scholarly journals Improved SDOF Approach to Incorporate the Effects of Axial Loads on the Dynamic Responses of Steel Columns Subjected to Blast Loads

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Junbo Yan ◽  
Yan Liu ◽  
Fenglei Huang
Keyword(s):  
Axial Loading ◽  
Material Behavior ◽  
Dynamic Responses ◽  
Axial Loads ◽  
Global Response ◽  
Single Degree Of Freedom ◽  
Steel Columns ◽  
Transverse Loads ◽  
Good Consistency ◽  
Complex Features

In this paper, a complicated single-degree-of-freedom (SDOF) approach was developed to determine the global response of steel columns under combined axial and blast-induced transverse loads. Nonlinear section and member analyses were incorporated into the suggested SDOF method to account for the complex features of the material behavior, the high strain rate effect, and the column geometry. The SDOF technique was validated through comparisons with available finite element and experimental data, and a good consistency was obtained. Then, the validated SDOF approach was utilized to derive the pressure-impulse curves under various levels of axial loading. The level of the axial load was shown to have a significant influence on the dynamic behavior of a steel column subjected to a blast load.

scholarly journals Numerical Evaluation of Dynamic Responses of Steel Frame Structures with Different Types of Haunch Connection Under Blast Load

2020 ◽  
Vol 10 (5) ◽  
pp. 1815
Author(s):  
Mustafasanie M. Yussof ◽  
Jordan Halomoan Silalahi ◽  
Mohd Khairul Kamarudin ◽  
Pei-Shan Chen ◽  
Gerard A. R. Parke
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Performance ◽  
Blast Loading ◽  
Steel Frame ◽  
Dynamic Responses ◽  
Blast Load ◽  
Structural Dynamic ◽  
Finite Element Software ◽  
Steel Frame Structures ◽  
Ductility Ratio

This research is aimed at investigating the dynamic behaviour of, and to analyse the dynamic response and dynamic performance of steel frames strengthened with welded haunches subjected to a typical hydrocarbon blast loading. The structural dynamic analysis was carried out incorporating the selected blast load, the validated 3D model of the structures with different welded haunch configurations, steel dynamic material properties, and non-linear dynamic analysis of multiple degree of freedom (MDOF) structural systems. The dynamic responses and effectiveness of the reinforced connections were examined using ABAQUS finite element software. Results showed that the presence of the welded haunch reinforcement decreased the maximum frame ductility ratio. Based on the evaluation of the results, the haunch reinforcements strengthened the selected steel frame and improved the dynamic performance compared to the frame with unreinforced connections under blast loading, and the biggest haunch configuration is the “best” type.

Dynamic Response and Failure Modes of Concrete Slab under Blast Load

2011 ◽  
Vol 94-96 ◽  
pp. 81-85
Author(s):  
Qiao Yan Li ◽  
Gai Hua Yu ◽  
Xiao Yun Guo
Keyword(s):  
Failure Modes ◽  
Concrete Slab ◽  
Dynamic Responses ◽  
Blast Load ◽  
Damage State ◽  
Concrete Material ◽  
Finite Element Program ◽  
Scaled Distance ◽  
Element Program ◽  
The Impact

The impact of blast load is always taken into consideration in significant building and protective construction. In order to study the mechanical behavior of the concrete slab under blast load, the dynamic responses of a square concrete slab under surface explosion are simulated by the nonlinear finite element program ANSYS/LS-DYNA. The JOHNSON_HOLMQUIST_CONCRETE model is used for concrete material and the damage and strain rate effect are considered in this mode1. The simplified exponential load is used as blast load. The Z-displacement,Mises effective stress and damage state of concrete slab under different blast load of corresponding scaled distance are investigated and discussed. It can be found from the results that the influence of blast pressure can be neglected when scaled distance is around 2.0 and the damage of slab is beginning from the edge.

scholarly journals The Finite Element Analysis for Concrete Filled Steel Columns under Blast Load

2016 ◽  
Author(s):  
Fereydoon Omidinasab ◽  
Peyman Beiranvand ◽  
Saeideh Sadeghi Golmakani ◽  
Mohammad Zarei
Keyword(s):  
Blast Resistance ◽  
Fire Behavior ◽  
Steel Tube ◽  
Absorption Capacity ◽  
Blast Load ◽  
Energy Absorption Capacity ◽  
Element Analysis ◽  
Steel Columns ◽  
Concrete Confinement ◽  
The Finite Element Analysis

Concrete-filled steel columns have been extensively used in the world due to having all suitable characteristics of concrete and steel, more ductility, increasing concrete confinement using steel wall, large energy-absorption capacity and appropriate fire behavior. In present paper, concrete-filled steel square columns have been simulated under the influence of blast load using ABAQUS software. These responses will be compared for scaled distances based on the distance to source and weight of explosive material. As result, it can be seen that although concrete deformation has been restricted using steel tube, but inner layer of concrete has been seriously damaged and column displacement will be decreased by increasing scaled distance. We also concluded that concrete-filled steel columns have high ductility and blast resistance.

Hydrodynamic Analysis of Deep-Water Fish Cage in Waves Based on Two Different Methods

2019 ◽  
Author(s):  
Yihou Wang ◽  
Yuwang Xu ◽  
Shuai Li ◽  
Haojie Ren ◽  
Shixiao Fu
Keyword(s):  
Dynamic Responses ◽  
Hydrodynamic Performance ◽  
Wave Forces ◽  
Cage Structure ◽  
Mooring Lines ◽  
Elastic Deformations ◽  
Hydrodynamic Analysis ◽  
Steel Columns ◽  
Global Dynamic ◽  
Water Fish

Abstract A fish cage is usually composed of steel columns, buoys, flexible nets and mooring lines. Elastic deformations will occur on these components under waves. The effects of these deformations on the global dynamic responses of the fish cage are still unclear. In this paper, a method considering hydroelastic deformation and a method considering the cage as rigid structure are employed to evaluate the hydrodynamic performance of a fish cage structure. The wave forces acting on these slender components are calculated based on Morison formula. The displacement of the cage and tension forces in the mooring lines obtained from these two methods are compared and the effects of hydroelastic deformation are discussed.

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