Strain rate behaviour in tension of S355 steel: Base for progressive collapse analysis

Forni, Daniele; Chiaia, Bernardino; Cadoni, Ezio

doi:10.1016/j.engstruct.2016.04.013

Cited by 113 publications

(52 citation statements)

References 34 publications

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“…The Johnson-Cook parameters evaluated by means of tests at room temperature are reported in Table [15], while the experimental data at different temperatures and for a fixed strain rate (450 s −1 ) were used to determine [16] the thermal softening sensitivity parameters (Table 2). In a previous study by the current authors [16], a thermal softening factor obtained experimentally at different temperatures was defined (R * ).…”

Section: Constitutive Modelmentioning

confidence: 99%

“…In order to find the Johnson-Cook parameters A, B and n [15], representing the strain hardening effects of the material in quasistatic conditions, c [15] representing the strain rate sensitivity and m [16] representing the thermal softening sensitivity, a mechanical characterisation in a wide range of temperatures and high strain rates is necessary.…”

Section: Progressive Collapse: Choice Of the Approachmentioning

confidence: 99%

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Mechanical Properties of S355 Under Extreme Coupled Effect of High Temperatures and High Strain Rates

Forni¹,

Chiaia²,

Cadoni³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Keywords: Robustness, fire induced progressive collapse, S355 structural steel, high strainrates, high temperatures, Johnson-Cook constitutive law.Abstract. With the intention of focusing the attention on the extreme combined effects of temperature and dynamic loadings, the high strain rate behaviour in tension of the widely used S355 structural steel in a wide range of elevated temperatures is presented. By means of a Split Hopkinson Tensile Bar (SHTB) equipped with a water-cooled induction heating system, the main mechanical properties as well as different strain energy densities have been evaluated. The reduction factors for the main mechanical properties, in which the novelty of our data is the addition of the strain rate dependency to the temperature, are reported as well. Lastly, a critic review of the Johnson-Cook constitutive law has been reported, highlighting that the use of single averaged thermal softening parameter (m) could lead to considerable errors. These results could be of great interest for the assessment of robustness in structures subjected to fire induced progressive collapse.

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Section: Constitutive Modelmentioning

confidence: 99%

Section: Progressive Collapse: Choice Of the Approachmentioning

confidence: 99%

Mechanical Properties of S355 Under Extreme Coupled Effect of High Temperatures and High Strain Rates

Forni¹,

Chiaia²,

Cadoni³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

Self Cite

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“…The proposed constitutive model can provide better prediction accuracy for yield stress than the Johnson-Cook model.It has been proved experimentally that steel is significantly sensitive to the strain rate induced by dynamic loads [6][7][8]. Furthermore, it is possible for engineering structures to be exposed to extreme dynamic loads during their service life, such as vehicle or vessel collision, gas or bomb explosion [9], and progressive collapse [10][11][12]. Therefore, understanding the strain rate behavior and obtaining the rate-dependent constitutive model of reinforcing bar are of significance for the design and performance evaluation of RC structures under such extreme dynamic loads.…”

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confidence: 99%

Dynamic Tensile Behavior of Steel HRB500E Reinforcing Bar at Low, Medium, and High Strain Rates

et al. 2020

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The strain rate effect of engineering materials should be considered in the assessment of the performance of reinforced concrete (RC) structures under extreme dynamic loads such as blast and impact. However, the strain rate behavior of 500 MPa-grade anti-earthquake hot-rolled high-strength ribbed bar (HRB500E), used in critical RC members to improve the anti-earthquake performance, has not been investigated and reported in the open literature. That restricts its application in RC structures subjected to extreme dynamic loads. In this paper, dynamic tensile tests of HRB500E steel were conducted using an electromechanical universal testing machine and a servo-hydraulic high-speed testing machine. The stress–strain curves at strain rates ranging from 0.00025 to 550 s−1 were obtained where HRB500E steel was found significantly sensitive to strain rate. Existing formulations to evaluate the dynamic increase factor for yield stress (DIFy) are found to be not suitable for HRB500E steel, thus the widely used Cowper–Symonds and Malvar models for predicting the DIFy were modified based on the test results. Furthermore, the parameter of the Mander material model for describing engineering stress–strain relationship was also calibrated. Finally, the Johnson-Cook and proposed constitutive models for the true stress–strain relationship were examined. The proposed constitutive model can provide better prediction accuracy for yield stress than the Johnson-Cook model.

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“…The tensile and low cycle fatigue behavior of steel at various grades (S355, S400, S500s, and S690) were analyzed. [18][19][20][21] Under low cycle loading the ductility degenerated, the embrittlement reduced the elongation of steel bars. Steel with higher strength performed better fatigue resistance.…”

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confidence: 99%

“…[15,28] Existing researches analyze the tensile properties of steel at various grades (B500A, B450C, and S355); the fatigue behavior is obviously influenced by steel type. [20,29,30] The fatigue parameters (C f , C d , and α) for steel are employed in finite element simulation [27] ; there is disparity in the suggested values as well. Heo [31] investigated the structural response sensitivity to constitutive models of steel.…”

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confidence: 99%

Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

Xiao

Zhang

et al. 2019

Structural Design Tall Build

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In this study, a damage model-based fatigue behavior is proposed. To consider the fatigue behavior of steel in the damage model, the experimental research on reinforcing steel bar grades HRB400 was presented. The monotonic tension test and lowcycle fatigue test were carried out. The plastic strain amplitude-fatigue cycle (ε p -2N f ) curve and plastic strain amplitude-strength loss factor (ε p -ϕ SR ) curve were obtained. The fatigue parameters (C f , C d , and α) were proposed by nonlinear fitting.The specimens were simulated using the "Reinforcing Steel" material in "OpenSees"program. These fatigue parameters were proved to accurately describe the fatigue behavior of HRB400 rebar. Moreover, to verify the application of fatigue damage model in RC column, fiber-based element models were established based on the quasi-static cyclic test on RC columns. The calculated results agreed well with those of the tests. The damage degree of RC column was calculated by the recorded stressstrain curves of material. The proposed fatigue parameters could be referred in damage model based on material fatigue behavior. KEYWORDS damage index, low-cycle fatigue, numerical analysis, reinforcing steel bar, seismic behaviorThe current reinforced concrete (RC) structures such as bridge, crane beam, and high-rise buildings bear not only the static loading but also cyclic loading . [1,2] Structures experience deformations beyond the yielding stage in long-term situation. [3] This may lead to brittle failure characterized by insufficient utilization of material strength. [4,5] For taking full advantages of material mechanical properties in structural design, reliable methods to predict fatigue damage are recommend.Recently, various damage models for appraising structural performance state have been proposed. [6][7][8][9] Park-Ang gave the classical doubleparameter model, which depended on both of maximum deformation and hysteretic energy. [10] This model considered the interaction between accumulated damage and structural response. Guo et al. [11] extended the application of Park-Ang model to three-dimensional case; it was reliable in evaluating the damage under coupling of axial loading and bidirectional bending. Fu and Liu [12] took various displacement amplitudes and load sequence into account, whereas effective energy dissipation factor and load sequence factor were introduced. These works attempted to precisely quantify the damage degree. After that, the fatigue of material was found to influence damage degree, as the accumulated hysteretic energy and inelastic deformation resulted in the change of material mechanical properties. [13] Castillo et al. [14] generalized the Weibull model for predicting fatigue behavior at any stress level. The fatigue life of structure can be estimated by these fatigue damage model.It was concluded that the fatigue performance of structure was directly influenced by the fatigue behavior of reinforcement. [15] Zanuy et al. [16] conducted the fatigue test on RC box-girder bridges. The relationship between...

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Strain rate behaviour in tension of S355 steel: Base for progressive collapse analysis

Cited by 113 publications

References 34 publications

Mechanical Properties of S355 Under Extreme Coupled Effect of High Temperatures and High Strain Rates

Mechanical Properties of S355 Under Extreme Coupled Effect of High Temperatures and High Strain Rates

Dynamic Tensile Behavior of Steel HRB500E Reinforcing Bar at Low, Medium, and High Strain Rates

Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

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