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

Al-Thairy, Haitham

doi:10.1155/2018/1591384

Cited by 9 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the far-field range, the overpressure distribution acting on a structural member is approximately uniform, while for close-in detonation it is non-uniform and may be localised to a limited zone. Thus, previous studies, in which numerical simulations were conducted for the far-field range, adopted a uniform pressure distribution assumption, which allowed the overpressure to be applied as a uniform loading condition to the structural element (Al-Thairy, 2018;Hadianfard et al, 2018;Ritchie et al, 2017Ritchie et al, , 2018aZhang et al, 2015). This approach results in a relatively simple numerical model which includes a Lagrange mesh formulation for the structural member only, without any detailed modelling of the explosive detonation process.…”

Section: Generalmentioning

confidence: 99%

Strong-axis response of steel I-sections subjected to close-in detonations

Grisaro

Seica

Packer

et al. 2020

International Journal of Protective Structures

View full text Add to dashboard Cite

The analysis of structural members subjected to close-in detonations involves a complicated dynamic scenario. Since the charge is very close to the structural member, the reflected pressure distribution on the member surface is highly non-uniform. In addition, the level of damage to the structural member may be high because of the large magnitude of the load. Due to these phenomena, the response of a structural member to close-in detonation cannot be accurately modelled by relatively simple methods like single-degree of freedom models, and more complicated models are required. Such models need to include numerical simulation of the detonation process, which produces a non-uniform pressure environment, allowing the pressure to reflect and flow around the member section. The local damage and flow around the section are especially of interest in I-shaped, or wide-flange-section members. Herein, the response of such sections is modelled by numerical simulations using a novel technique, which overcomes the difficulty of computation time, and is validated through various calculations. The model is used to perform a parametric study to investigate the response of I-sections subjected to close-in detonations, in terms of local damage and global behaviour, with scaled distances of 0.15–0.29 m/kg1/3 and loading causing flexure about the strong axis. Various aspects that affect the performance are studied, such as: the effect of scaled distance, the addition of welded stiffening plates between the flanges and web, the effect of boundary conditions and the effect of charge shape. Resulting local damage and residual deformations are assessed for the cases studied.

show abstract

Section: Generalmentioning

confidence: 99%

Strong-axis response of steel I-sections subjected to close-in detonations

Grisaro

Seica

Packer

et al. 2020

International Journal of Protective Structures

View full text Add to dashboard Cite

show abstract

“…To date, research studies investigating the response of steel frame buildings to blast have primarily focused on the response of isolated components under short-duration blast loads that are likely to only cause localized damage to one or few columns, which can potentially trigger progressive collapse [5,7] similar to the partial collapse of the Alfred P. Murrah Building in Oklahoma City in 1995. In that context, many studies have investigated the response of isolated steel members numerically [8][9][10] and with simulated or actual blast tests [5,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Full-Scale Blast Tests on a Conventionally Designed Three-Story Steel Braced Frame with Composite Floor Slabs

2021

View full text Add to dashboard Cite

This paper summarizes the findings of two full-scale blasts tests on a steel braced frame structure with composite floor slabs, which are representative of a typical office building. The aim of this research study was to experimentally characterize the behavior of conventionally designed steel braced frames to blast loads when enclosed with conventional and blast-resistant façade. The two tests involved a three-story, steel braced frame with concentrical steel braces, which are designed to resist typical gravity and wind loads without design provisions for blast or earthquake loads. During the first blast test, the structure was enclosed with a typical, non-blast-resistant, curtainwall façade, and the steel frame sustained minimal damage. For the second blast test, the structure was enclosed with a blast-resistant façade, which resulted in higher damage levels with some brace connections rupturing, but the building did not collapse. Observations from the test program indicate the appreciable reserved capacity of steel brace frame structures to resist blast loads.

show abstract

Numerical study of low‐rise composite steel frame responses to blast loading using direct simulation method

Sharaf,

Ismail,

Elghandour

et al. 2024

Structural Concrete

View full text Add to dashboard Cite

This paper investigated the blast behavior of a low‐rise composite steel structure of three stories subjected to internal and external explosions for the same explosive charge of 250 kg TNT. A comparison of three various blast scenarios is aimed at better understanding how blast waves propagate in confined risk zones and their damage effects on far and exposed elements to an explosive charge. Evaluation of the damage level and the overall response of the proposed numerical model is done by estimating the adequacy of structural members subjected to blast loading using general limits in attempting to check the structure's strength and regularity. The analysis was based on load combinations and damage criteria according to the Unified Facilities Criteria which are general design approaches suitable for civil design applications in forecasting blast loads and structural system responses. The overall behavior of this structure was simulated based on a dynamic analysis by the direct simulation approach, which was chosen for modeling blast loads using the Friedlander blast load equation, and the simpler, less expensive, more accurate, and realistic A.T.‐BLAST model to deduce the simplified blast‐wave overpressure profile. The material nonlinearity at a high strain rate using the Johnson‐Cook strength and concrete plasticity damage model is studied dynamically using ABAQUS finite element code to simulate the explicit dynamic nonlinear analysis. The overall response of the proposed numerical model was evaluated by estimating the adequacy of structural members, considering the blast load as the initial cause of failure, such as axial plastic strain, internal forces limits, maximum deformation, support rotation, demand‐capacity‐ratio (DCRshear/moment), drift index and material damage model. The position of the explosive charge played an important role in determining the rate at which the structural element begins to plastic strains, displacements, moments, or rotations beyond the limits, and then key elements should be considered in structural design against progressive collapse. Results showed that steel members exhibit early indicators of failure, such as buckling necking, shear tearing, or plastic hinges, whereas concrete slabs break up immediately due to brittleness. DCRmoment values successfully showed the columns in which the first plastic joint can occur, whereas DCRshear values signaled the onset of shear failure at connections. Besides, plastic hinges played an important role in dissipating energy and preventing total structural collapse via the Strong Column‐Weak Beam design concept, which appears repeatedly in this study. The structure is a well‐designed and ductile building capable of supporting higher loads and is considered to be repairable and intact.

show abstract

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

Cited by 9 publications

References 11 publications

Strong-axis response of steel I-sections subjected to close-in detonations

Strong-axis response of steel I-sections subjected to close-in detonations

Full-Scale Blast Tests on a Conventionally Designed Three-Story Steel Braced Frame with Composite Floor Slabs

Numerical study of low‐rise composite steel frame responses to blast loading using direct simulation method

Contact Info

Product

Resources

About