Finite element analysis of steel beam to column connections subjected to blast loads

Sabuwala, Tapan; Linzell, Daniel G.; Krauthammer, Theodor

doi:10.1016/j.ijimpeng.2004.04.013

Cited by 69 publications

(31 citation statements)

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“…On the other hand, the behaviour of steel joints subjected to severe impulsive loading is less documented. In the past decade, after the attack on the World Trade Center in New York in 2001, there has been increased interest in the behaviour of steel structures under extreme loading conditions [1][2][3][4][5]. The design code Unified Facilities Criteria [6] states that joints subjected to blast loads should have adequate strength, stiffness, and rotation capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Sabuwala et al [3] and Tyas et al [4] express that there is lack of experimental data published on the behaviour of steel connections subjected to extreme, non-cyclical loading. Karns et al [9] report the results from tests where double-sided beam-to-column joint configurations were subjected to an explosion blast and subsequent progressive collapse load conditions.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of static and dynamic behaviour of bolted end-plate joints of steel

Grimsmo

Clausen

Langseth

et al. 2015

International Journal of Impact Engineering

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Many actions, such as accidental or malicious explosions, may impose high loading rates to structural frames. To enhance the knowledge of the behaviour of joints subjected to severe impulsive loading, a double-sided beam-to-column joint configuration was tested at quasi-static and dynamic loading rates. The test specimens consisted of H-section beams and columns, extended end-plates, and high-strength bolts. In both the quasi-static and dynamic tests, the fracture modes were bolt failure in combination with plastic deformation of the end-plates. However, it was observed that the joints absorbed considerably more energy before failure in the dynamic tests than in the quasi-static tests, partly due to changes in the deformation modes. Also, the ductility of the joints seemed to increase for higher loading rates. These results suggest that the tested joints behave in a preferable manner under extreme impulsive loads.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An experimental study of static and dynamic behaviour of bolted end-plate joints of steel

Grimsmo

Clausen

Langseth

et al. 2015

International Journal of Impact Engineering

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“…Connections were represented with macro-models consisting of non-linear spring elements. The properties of the springs were calibrated against the authors' high-resolution finite element simulations published elsewhere [30][31], and available experimental tests [17] [32]. Spring representation is computationally efficient, yet it adequately captures the connection behavior.…”

Section: Structural Representationmentioning

confidence: 99%

Energy flow in progressive collapse of steel framed buildings

Szyniszewski

Krauthammer

2012

Engineering Structures

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This paper provides the methodology for an energy-based progressive collapse assessment of multistory buildings. The progressive collapse of steel-framed buildings is analyzed based on an energy flow perspective. The energy based assessment of structural members is introduced, and compared with conventional force and deformation approaches discussed in the literature. Consecutively, the advantages of energy flow analysis in interpretation of extreme dynamic events are discussed. On the global level, a building can arrest the collapse, and achieve its stable configuration only if the kinetic energy is completely dissipated by the structure. Otherwise, the remaining kinetic energy will cause the collapse to continue. In a conventional building, kinetic energy is dissipated within structural members by the transformation into their deformation energy. Structural members can dissipate finite amounts of energy before becoming unstable. The column deformation energy was shown to be a better stability indicator under dynamic loading than the maximum dynamic force. The energy flow analysis is illustrated with a collapse assessment of a typical steel building.Keywords: progressive collapse, energy flow, energy dissipation, structural robustness, steel building, global stability, column buckling, collapse analysis Murrah Federal Building collapse proved that the possibility of progressive, catastrophic failure is remarkably real and must be addressed [2]. An increasing number of buildings are locally damaged due to explosions and construction errors. Progressive failure can potentially spread throughout the building and result in a catastrophic failure that involves numerous deaths [3,4,5,6]. This study aims at providing new insights into the dynamic, transient phase of collapse propagation. The main objective of this work is to enable the development of an energy-based analysis of progressive collapse of steel buildings by focusing on the role of the energy flow. The specific objectives are:• Compare the energy flow method to traditional force-based approaches, and demonstrate their equivalence in well-understood situations,• Provide an illustrative example of how to interpret and employ the energy-based analysis of progressive collapse. BackgroundProgressive collapse can be viewed as a "domino effect" because a local failure triggers successive failures, progressing in time to a collapse encompassing a disproportionately large portion of a building. The in-depth overview of progressive collapse mitigation approaches and robustnessoriented design can be found in [7]. Grierson et al. [8] proposed an incremental, sequential static procedure. Grierson's method is an extension of a plastic hinge approach. Each step of the procedure ends at the formation of a new set of plastic hinges until the building collapses or reaches a stable state.This approach includes connection failure and accounts for impact forces from falling members.3 Izzuddin et al. [9] focused on connections between beams and columns as triggers of p...

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“…Considering the descriptions presented in this paper, dynamic increase factors (DIF) developed by Department of the US Army Corps of Engineers are taken into account for strain-rate effect [15,16]. These coefficients are presented in Table 3.…”

Section: Materials Propertymentioning

confidence: 99%

“…Based on the analyses results from the full models, the characterized property was used to simplify the configurations which are feasible in three-dimensional multi-story frame analysis. [15] One of the important studies carried out to investigate the blast loading effect on connection behavior is the study conducted by Tapan Sabuwala et al [16].…”

Section: Introductionmentioning

confidence: 99%