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Number of results: 8
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Abstract

Numerical analysis of the tensioning cables anchorage zone of a bridge superstructure is presented in this paper. It aims to identify why severe concrete cracking occurs during the tensioning process in the vicinity of anchor heads. In order to simulate the tensioning, among others, a so-called local numerical model of a section of the bridge superstructure was created in the Abaqus Finite Element Method (FEM) environment. The model contains all the important elements of the analyzed section of the concrete bridge superstructure, namely concrete, reinforcement and the anchoring system. FEM analyses are performed with the inclusion of both material and geometric nonlinearities. Concrete Damage Plasticity (CDP) constitutive relation from Abaqus is used to describe nonlinear concrete behaviour, which enables analysis of concrete damage and crack propagation. These numerical FEM results are then compared with actual crack patterns, which have been spotted and inventoried at the bridge construction site.

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Authors and Affiliations

J. Chróscielewski
M. Miśkiewicz
Ł. Pyrzowski
B. Sobczyk
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Abstract

Recently, textile reinforced concrete (TRC) has been intensively studied for strengthening reinforced concrete (RC) and masonry structures. This study is to experimentally explore the effectiveness of application of carbon TRC to strengthen RC beam in flexure and shear. Concerning the cracks formation, failure modes, ultimate strength and overall stiffness, the performance of the strengthened beams compared to the control beams were evaluated from two groups of tests. The test results confirm that the TRC layers significantly enhance both shear and flexural capacity of RC beams in cracking, yielding and ultimate loads. All of the tested specimens were also modelled using ABAQUS/CAE software, in order to validate the experimental results. The numerical results show that the simulation models have good adaptability and high accuracy.

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Authors and Affiliations

Cuong Huy Nguyen
Quang Dang Ngo
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Abstract

The axial crumpling of frusta in the axisymmetric "concertina" mode is examined. A new theoretical model is developed in which the inward folding in both cylinders and frusta is addressed. The results were compared with previous relevant models as well as experimental findings. The flexibility of the model was substantiated by its capability of describing and estimating the inward folding in frusta in general as well as in cylinders as a special case. A declining trend of the eccentricity dependence with the D/t ratio was found in contrast with a previous theory which suggests total independency. ABAQUS 14-2 finite element software was employed to simulate the thin tube as a 3-D thin shell part. Numerical simulations of the process were found to, firstly, underestimate the theoretical values of inward folding in general, secondly anticipate more underestimations as the tubes become thinner and/or have larger apex angle, and finally anticipate as low as 300 apical angle frusta to revert its mode of deformation to global inversion.
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Bibliography

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[2] J.M. Alexander. An approximate analysis of the collapse of thin cylindrical shells under axial loading. The Quarterly Journal of Mechanics and Applied Mathematics, 13(1):10–15, 1960. doi: 10.1093/qjmam/13.1.10.
[3] A.A.K. Mohammed, M.N. Alam, and R. Ansari. Quasi-static study of thin aluminium frusta with linearly varying wall-thickness. International Journal of Crashworthiness, 25(5):473–484, 2020. doi: 10.1080/13588265.2019.1613762.
[4] A. Shiravand and M. Asgari. Hybrid metal-composite conical tubes for energy absorption; theoretical development and numerical simulation. Thin-Walled Structures, 145:106442, 2019. doi: 10.1016/j.tws.2019.106442.
[5] P. Sadjad, E.M. Hossein, and E.M. Sobhan. Crashworthiness of double-cell conical tubes with different cross sections subjected to dynamic axial and oblique loads. Journal of Central South University, 25:632–645, 2018. doi: 10.1007/s11771-018-3766-z.
[6] G. Lu , J.L. Yu , J.J. Zhang, and T.X. Yu. Alexander revisited: upper- and lower-bound approaches for axial crushing of a circular tube. International Journal of Mechanical Sciences, 206:106610, 2021. doi: 10.1016/j.ijmecsci.2021.106610.
[7] A. Sadighi, A. Eyvazian, M. Asgari, and A.M. Hamouda. A novel axially half corrugated thin-walled tube for energy absorption under axial loading. Thin-Walled Structures, 145:106418, 2019. doi: 10.1016/j.tws.2019.106418.
[8] M.Y. Abbood, and R.N. Kiter. On the peak quasi-static load of axisymmetric buckling of circular tubes. International Journal of Crashworthiness, 27(2):367–375, 2022. doi: 10.1080/13588265.2020.1807679.
[9] T. Wierzbicki, S.U. Bhat, W. Abramowicz, and D. Brodkin. Alexander revisited–-A two folding elements model of progressive crushing of tubes. International Journal of Solids and Structures, 29(4):3269–3288, 1992. doi: 10.1016/0020-7683(92)90040-Z.
[10] A.A. Singace, H. Elsobky, and T.Y. Reddy. On the eccentricity factor in the progressive crushing of tubes. International Journal of Solids and Structures, 32(24):3589-3602, 1995. doi: 10.1016/0020-7683(95)00020-B.
[11] H.E. Postlethwaite and B. Mills. Use of collapsible structural elements as impact isolators, with special reference to automotive applications. The Journal of Strain Analysis for Engineering Design, 5(1):58–73,1970. doi: 10.1243/03093247V051058.
[12] A.G. Mamalis, D.E. Manolakos, S. Saigal, G. Viegelahn, and W. Johnson. Extensible plastic collapse of thin-wall frusta as energy absorbers. International Journal of Mechanical Sciences, 28(4):219–229, 1986. doi: 10.1016/0020-7403(86)90070-6.
[13] A.G. Mamalis, D.E. Manolakos, G.L. Viegelahn, and W. Johnson. The modeling of the progressive extensible plastic collapse of thin-wall shells. International Journal of Mechanical Sciences, 30(3-4):249–261, 1988. doi: 10.1016/0020-7403(88)90058-6.
[14] N.K. Gupta, G.L. Prasad, and S.K. Gupta. Plastic collapse of metallic conical frusta of large semi-apical angles. International Journal of Crashworthiness, 2(4):349–366, 1997. doi: 10.1533/cras.1997.0054.
[15] A.A.A. Alghamdi, A.A.N. Aljawi, and T.M.N. Abu-Mansour. Modes of axial collapse of unconstrained capped frusta. International Journal of Mechanical Sciences, 44(6):1145–1161, 2002. doi: 10.1016/S0020-7403(02)00018-8.
[16] N.M. Sheriff, N.K. Gupta, R. Velmurugan, and N. Shanmugapriyan. Optimization of thin conical frusta for impact energy absorption. Thin-Walled Structures, 46(6):653–666, 2008. doi: 10.1016/j.tws.2007.12.001.
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Authors and Affiliations

Riyah N. Kiter
1
Mazin Y. Abbood
1
ORCID: ORCID
Omar H. Hassoon
2
ORCID: ORCID

  1. Department of Mechanical Engineering, College of Engineering, University of Anbar, Iraq
  2. Department of Production and Metallurgy Engineering, University of Technology, Baghdad, Iraq
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Abstract

Mechanical properties of FRP such as strength and stiffness as well as the bonding interface between FRP and concrete will be badly deteriorated when exposed to high temperature. Furthermore, the effect of thickness of insulation with different type of concrete strength has not yet been studied elsewhere in numerical studies. Therefore, this study is to assess the thermal-structural behaviour of insulated FRP strengthened RC beam exposed to elevated temperature using ABAQUS. The proposed numerical model of 200 ×300 mm RC beam subjected to 2 hours standard fire curve (ISO 834) had been validated with the analytical solution. The validated numerical model then is used in parametric study to investigate the behaviour of fire damaged normal strength concrete (40 MPa) and high strength concrete (60 MPa) of RC beam strengthened with CFRP using various fire insulation thickness of 12.5 mm, 25 mm and 40 mm, respectively. The result of steel characteristic strength reduction factor is compared with analytical using 500˚C Isotherm methods. The parametric studies indicated that the fire insulation layer is essential to provide fire protection to the CFRP strengthened RC beams when exposed to elevated temperature. The insulation layer thickness of 25 mm had been found to be the optimum thickness to be used as it is able to meet the criteria of temperature distribution and displacement requirement. In conclusion, the numerical model developed using ABAQUS in this study is to carry out assessment on the thermal-structural behaviour of the insulated CFRP-strengthened RC beams at elevated temperature.
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Authors and Affiliations

Ng Chee Keong
1
ORCID: ORCID
Mariyana Aida Ab Kadir
2 3
ORCID: ORCID
Nurizaty Zuhan
2
ORCID: ORCID
Muhammad Najmi Mohamad Ali Mastor
4
ORCID: ORCID
Mohd Nur Asmawisham Alel
5
ORCID: ORCID

  1. Public Work Department, Jalan Sultan Salahuddin, 50582 Kuala Lumpur, Malaysia
  2. School of Civil Engineering, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  3. Institute of Noise and Vibration, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  4. Candidate, School of Civil Engineering, University Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
  5. Engineering Seismology and Earthquake Engineering Research (eSEER), Institute of Noise and Vibration, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Johor, Malaysia
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Abstract

The article presents detailed guidelines for the nonlinear modelling of wood–CFRP beams with full cross-section using the Finite Element Method (FEM). Reviewing the literature has shown that behaviour of such composites is a current research topic, undertaken by many scientists. Complex numerical models made in the Simulia ABAQUS software are the basis for modelling recommendations. Properties of the materials consider the orthotropy and plasticity of wood and CFRP tapes, and the stiffness of adhesive layers with delamination. Results of laboratory experiments, got for a statistically significant number of specimens, confirm the model assumptions. This research paper provides a rich source of knowledge and experiences for scientists and engineers, who deal with mechanics of wood–CFRP composites. The uniqueness of the presentation lies in the detailed description of the complex numerical model. Specification comprises the steps necessary to do complete and successful calculations. The model is suitable for analysing the behaviour of wood–CFRP composites in different reinforcement configurations.
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Authors and Affiliations

Bartosz Kawecki
1
ORCID: ORCID

  1. Lublin University of Technology, Faculty of Civil Engineering and Architecture, ul. Nadbystrzycka 40, 20-618 Lublin, Poland
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Abstract

The paper presents a numerical study of an aircraft wheel impacting on a flexible landing surface. The proposed 3D model simulates the behaviour of flexible runway pavement during the landing phase. This model was implemented in a finite element code in order to investigate the impact of repeated cycles of loads on pavement response.

In the model, a multi-layer pavement structure was considered. In addition, the asphalt layer (HMA) was assumed to follow a viscoelastoplastic behaviour.

The results demonstrate the capability of the model in predicting the permanent deformation distribution in the asphalt layer.

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Authors and Affiliations

G. Leonardi
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Abstract

This paper details a finite element analysis of the behaviour of Si-Al geopolymer concrete beam reinforced steel bar under an impulsive load and hyper velocity speed up to 1 km/s created by an air blast explosion. The initial torsion stiffness and ultimate torsion strength of the beam increased with increasing compressive strength and decreasing stirrup ratio. The study involves building a finite element model to detail the stress distribution and compute the level of damage, displacement, and cracks development on the geopolymer concrete reinforcement beam. This was done in ABAQUS, where a computational model of the finite element was used to determine the elasticity, plasticity, concrete tension damages, concrete damage plasticity, and the viability of the Johnson-Cook Damage method on the Si-Al geopolymer concrete. The results from the numerical simulation show that an increase in the load magnitude at the midspan of the beam leads to a percentage increase in the ultimate damage of the reinforced geopolymer beams failing in shear plastic deformation. The correlation between the numerical and experimental blasting results confirmed that the damage pattern accurately predicts the response of the steel reinforcement Si-Al geopolymer concrete beams, concluded that decreasing the scaled distance from 0.298 kg/m3 to 0.149 kg/m3 increased the deformation percentage.
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Authors and Affiliations

Nurul Aida Mohd Mortar
1 2
ORCID: ORCID
Mohd Mustafa Al Bakri Abdullah
1 2
ORCID: ORCID
Kamarudin Hussin
1
ORCID: ORCID
Rafiza Abdul Razak
3
ORCID: ORCID
Sanusi Hamat
4
ORCID: ORCID
Ahmad Humaizi Hilmi
4
Noorfifi Natasha Shahedan
1
ORCID: ORCID
Long Yuan Li
5
ORCID: ORCID
Ikmal Hakem A. Aziz
1
ORCID: ORCID

  1. Universiti Malaysia Perlis, Center of Excellence Geopolymer and Green Technology (CEGeoGTech), Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Faculty of Chemical Engineering Technology, Malaysia
  3. Universiti Malaysia Perlis (UniMAP), Faculty of Civil Engineering Technology, Malaysia
  4. Universiti Malaysia Perlis (UniMAP), Faculty of Mechanical Engineering Technology, Malaysia
  5. University of Plymouth, School of Marine Science and Engineering, Plymouth PL4 8AA, United Kingdom

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