SDOF response model parameters from dynamic blast loading experiments

Fischer, Kai; Häring, Ivo

doi:10.1016/j.engstruct.2009.02.040

Cited by 67 publications

(27 citation statements)

References 19 publications

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“…3 SDOF ANALYSIS Single degree-of-freedom (SDOF) analyses have been used to predict the dynamic response of simple structural components subjected to blast loading [17,18]. An SDOF analysis, assuming a hinge failure at the midpoint of the specimen, a uniformly-distributed load, and simply supported boundary conditions, was created for this test series.…”

Section: Resultsmentioning

confidence: 99%

Analysis methods for CFRP blast retrofitted reinforced concrete wall systems

Pezzola¹,

Stewart²,

Hegemier³

2016

Int. J. CMEM

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A blast retrofit technique for concrete structures using carbon fiber-reinforced polymer (CFRP) layers was investigated for use in large infrastructure systems with the overarching goal of preventing against major loss of life and considerable damage that would require extensive repair. Large-scale experiments were conducted and the retrofit behavior was investigated for application on relatively large reinforced concrete walls subjected to blast-like loadings. The experimental program utilized the University of California San Diego (UCSD) Blast Simulator. The Blast Simulator is able to induce various blast-like shock waves to the test specimen in a controlled laboratory environment. The performance of this blast retrofit was tested and then analyzed using SDOF and finite element modeling methods. A finite element model was created using LS-DYNA and utilized contact algorithms for the CFRP-concrete interface. Results and comparisons between the two analysis methods are given. Keywords: blast, CFRP, finite element, reinforced concrete, SDOF. INTRODUCTIONFiber-reinforced polymer (FRP) laminates have been shown in many studies to effectively retrofit and repair reinforced concrete structural elements [1][2][3][4][5]. The use of FRP as a retrofit is popular as it can be installed post-construction to strengthen the structure. It allows for fast installation, and has a very high stiffness and tensile strength [6,7]. Often times anchorage systems are used to mechanically restrain the FRP and to prevent delamination between the FRP and concrete, and in order to try and achieve the full tensile capacity of the FRP. Many tests have been conducted and the results are mixed and inconclusive [8][9][10].The performance of anchorage systems in retrofits is extremely important, as failure modes of the FRP are not tensile failures, but failures due to local stress concentrations by the anchors and delamination of the FRP to the concrete [1,[11][12][13][14]. These failures are much more sudden and less ductile than a tensile strength failure of the FRP, which emphasizes the need to achieve an anchoring system that allows the FRP to achieve full tensile failure.

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Section: Resultsmentioning

confidence: 99%

Analysis methods for CFRP blast retrofitted reinforced concrete wall systems

Pezzola¹,

Stewart²,

Hegemier³

2016

Int. J. CMEM

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“…The judgment of structural instability or complete fracture is accepted by engineers through method of maximum displacement response of an equivalent SDOF elasto-plastic system. FISCHER and HARING [8] studied the factors influencing SDOF system based on the impacts on structures caused by shock loading. In terms of energy, TERAN et al [9] comprehensively took the factors, related with the design of structure seismic, affecting structure stress and deformation into consideration.…”

Section: Introductionmentioning

confidence: 99%

Simplified design of rock cavern concrete lining to resist shock loading

Zhao¹,

Lok

Yin

et al. 2010

J. Cent. South Univ. Technol.

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A simplified method was proposed for the design of concrete lining in underground rock cavern/tunnel against shock loading. The loading may result from the detonation of explosives on ground surface or ground penetration projectiles exploding adjacent to the cavern/tunnel. The resulting problem necessitates the solution of the dynamics of a beam loaded by a transient pressure uniformly distributed over the span. According to mechanical characteristics of the system with rock bolt and shotcrete, a dynamic support design method based on equivalent single degree of freedom (SDOF) was put forward. The SDOF method was applied to obtaining the maximum displacement at the mid-span of the beam, which is often the controlling factor in the blast-resistant design. In the formulation of the problem, the proposed method combines the phenomena of spalling and structural dynamics theory. An example is provided to demonstrate the applicability of this simplified method.

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“…Smith [8] proposed a linear resistance function after glass cracking. Fischer and Häring [10] also conducted analysis of blast experimental data attempting to fit linear resistance functions. They then compared the deflections obtained from single degree of freedom models with those obtained during the experiments.…”

Section: Introductionmentioning

confidence: 99%

Reaction forces of laminated glass windows subject to blast loads

Linz

Hooper

Arora

et al. 2015

Composite Structures

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a b s t r a c tSeveral blast trials on laminated glass windows have been performed in the past, using both full field 3D Digital Image Correlation and strain gauges located on the supporting structure to collect information on the glass pane behaviour. The data obtained during three blast experiments were employed to calculate reaction forces throughout the perimeter supports both before and after the fracture of the glass layers. The pre-crack experimental data were combined with finite element modelling results to achieve this, whilst solely experimental results were employed for post-cracked reactions. The results for the three blast experiments were compared to identify similarities in their behaviour. It is intended that the results can be used to improve the existing spring-mass systems used for the design of blast resistant windows.

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SDOF response model parameters from dynamic blast loading experiments

Cited by 67 publications

References 19 publications

Analysis methods for CFRP blast retrofitted reinforced concrete wall systems

Analysis methods for CFRP blast retrofitted reinforced concrete wall systems

Simplified design of rock cavern concrete lining to resist shock loading

Reaction forces of laminated glass windows subject to blast loads

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