Analysis of the seismic behavior of CFRP-strengthened seismic-damaged composite steel-concrete frame joints

Xu, Cheng; Peng, Sheng; Liu, Xiaoqiang; Chen-fei, Wang; Xu, Qiqi

doi:10.1016/j.jobe.2019.101057

Cited by 15 publications

(5 citation statements)

References 17 publications

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“…The result in Figure 12 is obtained by computing the objective function in Equation (7). Based on this result, the optimal set of 7 mm thick φ100 mm CFRP pipe and 8.2 mm thick steel slab for the hybrid system can be determined.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, there is also a demand for lightweight materials for lighter, faster and safer military vehicles. Recently, an efficient material substitute for steel has been carbon fiber-reinforced polymer (CFRP), which contains numerous unique characteristics such as high strength-to-weight ratio and high strength [ 2 ], high energy absorption capacity, and corrosion resistance [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Moreover, the tensile strength and stiffness of steel structure were improved significantly by CFRP [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Design Optimization of Explosion-Resistant System Consisting of Steel Slab and CFRP Frame

Kim¹

2021

Materials

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This study presents an explosion-resistant hybrid system containing a steel slab and a carbon fiber-reinforced polymer (CFRP) frame. CFRP, which is a high-strength material, acts as an impact reflection part. Steel slab, which is a high-ductility material, plays a role as an impact energy absorption part. Based on the elastoplastic behavior of steel, a numerical model is proposed to simulate the dynamic responses of the hybrid system under the air pressure from an explosion. Based on this, a case study is conducted to analyze and identify the optimal design of the proposed hybrid system, which is subjected to an impact load condition. The observations from the case study show the optimal thicknesses of 8.2 and 7 mm for a steel slab and a ϕ100 mm CFRP pipe for the hybrid system, respectively. In addition, the ability of the proposed hybrid system to resist an uncertain explosion is demonstrated in the case study based on the reliability methodology.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design Optimization of Explosion-Resistant System Consisting of Steel Slab and CFRP Frame

Kim¹

2021

Materials

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“…Before delving into the seismic fragility assessment of an embankment [21,22], it's crucial to establish a framework for categorizing the degrees of earthquake-induced damage. To estimate the potential losses from earthquakes, floods, and hurricanes, Federal Emergency Management Agency (FEMA) and the National Institute of Building Sciences developed HAZUS'99 model where damages are segmented into five categories: undamaged, mildly damaged, moderately damaged, severely damaged, and completely destroyed.…”

Section: Failure Criteriamentioning

confidence: 99%

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Ahmed,

Alel,

Kadir

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The assessment of seismic fragility of highway embankments is a key component of seismic risk modeling for traffic infrastructure. This study examines the seismic fragility of an embankment using advanced finite element dynamic analysis, contrasting findings with prior research to validate results. Based on established methodologies, an incremental dynamic analysis (IDA) was executed, with the Probabilistic Seismic Demand Analysis (PSDA) for the development of fragility curves. A comparative study was conducted between two modeling methods; one employing finite difference (FD) method and other employing finite element (FE)method. The analysis revealed that, selection of inputs like the nature of earthquake time history and number of records selected along with the analysis method influences the seismic fragility assessment of embankments. The choice between finite difference and finite element methods can yield differing results, with FD, being grid-based, can face challenges with complex geometries and boundary conditions, on the other hand, FE’s mesh-based approach offers flexibility in modeling intricate domains, handles complex boundary conditions more adeptly, and provides a more continuous representation of material behavior. A distinct dynamic stability test based on Newmark sliding block principles showed the embankment slope’s inherent resilience, with no permanent deformation, underscoring the requirement for further research.

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“…where d max is the lateral maximum permanent displacement on the top surface of the embankment and D is the embankment width; D � 24.5 m. According to the investigation results of the Wenchuan earthquake, embankments at the epicenter (Yingxiu town) suffered from the most severely damage, i.e., destruction, and ε max reached 2.059% [50][51][52]; therefore, considering ε max � 2.0% as the boundary of severe damage and destruction was reasonable. Besides, the boundaries of ε max among other embankment seismic damage grades were further established based on the equidistant classifying method [17,53], as summarized in Table 2.…”

Section: Selection Of the Embankment Seismic Damage Parametermentioning

confidence: 99%

Embankment Seismic Fragility Assessment under the Near‐Fault Pulse‐like Ground Motions by Applying the Response Surface Method

Che

Yin

Zhou

et al. 2021

Shock and Vibration

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Uncertainties of the ground motions and structural parameters are the main factors that limit the accuracy of embankment seismic fragility assessment. In response to the uncertainties of the ground motions, artificial synthesizing method of the near-fault pulse-like ground motions was proposed, and 15 ground motions with the rupture fault distances ranging from 1 to 15 km were synthesized by taking the Chi-Chi earthquake in Taiwan, China, as an example. The Xi’an-Baoji expressway K1125 + 470 embankment was taken as the research object, and a total of 12 structural parameters were selected as the design variables, namely, the elastic modulus, bulk modulus, shear modulus, density, cohesion force, and internal friction angle of the embankment fill and soil foundation, respectively. In response to the uncertainties of these parameters, 3 principal components with large impacts on the embankment seismic fragility were extracted based on the principal component analysis. Mapping relationships among the principal components and embankment seismic damages were analyzed using the uniform design response surface method, and the seismic fragility assessment was carried out and the fragility curves were plotted. The research results are consistent with the actual embankment seismic damage conditions of the Chi-Chi earthquake, indicating that the proposed method is scientific and reasonable. It also shows that it would obviously overestimate the seismic performance in the embankment seismic fragility assessment without considering the uncertainties of the ground motions and structural parameters.

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Analysis of the seismic behavior of CFRP-strengthened seismic-damaged composite steel-concrete frame joints

Cited by 15 publications

References 17 publications

Design Optimization of Explosion-Resistant System Consisting of Steel Slab and CFRP Frame

Design Optimization of Explosion-Resistant System Consisting of Steel Slab and CFRP Frame

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Embankment Seismic Fragility Assessment under the Near‐Fault Pulse‐like Ground Motions by Applying the Response Surface Method

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