Force- and Displacement-Controlled Non-linear FE Analyses of RC Beam with Partial Steel Bonded Length

Yousaf, Muhammad; Siddiqi, Z. A.; Sharif, M. B.; Qazi, Asad Ullah

doi:10.1007/s40999-016-0076-4

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…Quantitatively, the enclosed area below the force–displacement curve is the total absorbed energy under displacement control. Based on the measurement under displacement control, we can further estimate the behavior under force control: once a peak force is reached, a sudden increase of displacement will occur, resulting in the enclosed area by the force–displacement curve nearly two times of that under displacement control. Therefore, the absorbed energy under force control is expected nearly doubled compared with displacement control.…”

Section: Resultssupporting

confidence: 72%

Programmable Granular Metamaterials for Reusable Energy Absorption

Zhao

Jin

2019

Adv Funct Materials

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Designing metamaterials with programmable features has emerged as a promising pathway for reusable energy absorption. While the current designs of reusable energy absorbers mainly exploit mechanical instability of flexible beams, here is created a new kind of metamaterial for reusable and programmable energy absorption by integrating rigid granular materials and compliant stretchable components. In each unit cell of the metamaterial, the stretchable components connect the granular particles to maintain the integrity and control the deformation pattern of the material. When the metamaterial is subjected to an external load, the input energy is partially trapped as elastic energy in the stretchable components, and partially dissipated by friction between the granular particles, forming hysteresis between the loading and unloading force-displacement curves. Through tuning the structural design of the metamaterial, the pretension and stiffness of the stretchable components, and the size of and friction between the particles, a vast design space is achieved to program the mechanical behavior of the metamaterial, such as the load-displacement curve, the multistability, and the amount of energy dissipation. Experimental impact tests on a thin glass panel confirm energy-absorbing capability of the proposed metamaterial. This design strategy opens a new avenue for creating reusable energy-absorbing metamaterials.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201901258. and a long working distance. Most commercial energy-absorbing products adopt plastic deformation or fragmentation of foams, [3] metals, [4] and ceramics, [5] to gain the desired hysteresis behavior, and introduce artificial defects, such as prefolding of origami, [6][7][8] to control the deformation mode. In the products with plastic deformation or fragmentation, dislocations and bond breakage occur at the molecule level, and a large amount of energy can be absorbed. However, they are only for one-time usage, since the materials are permanently damaged.In order to overcome the shortcoming of one-time usage, reusable energyabsorbing materials have been proposed by developing damage-tolerant micro [9] or nano lattices, [5] architectured composite materials, [10,11] and mechanical metamaterials. [12][13][14][15] Mechanical metamaterials are materials with microstructures, which give rise to unique mechanical properties that are otherwise hard to achieve. [12][13][14] By designing the microstructures, researchers have developed energy-absorbing metamaterials mainly through exploiting mechanical instability of the deformable microstructures. [16][17][18][19][20] A well-utilized strategy to achieve reusability is making use of bistability of curved beams and tilted straight beams under buckling, [21][22][23] since during the working process, deformation of these constituent structures is elastic. Although the energyabsorbing capability of these metamaterials is currently not comparable to those...

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Section: Resultssupporting

confidence: 72%

Programmable Granular Metamaterials for Reusable Energy Absorption

Zhao

Jin

2019

Adv Funct Materials

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“…In this study, Poisson's ratio of 0.3 and Elastic modulus of 2 3 10 5 MPa are used (Osman et al, 2017;Vasudevan et al, 2013). Besides, the yield stress and tangent modulus are input to the LINK180 element to model the bilinear elastic-plastic behavior of steel reinforcements (Kaya and Anil, 2021;Sayed, 2019;Yousaf et al, 2017). The SOLID65 and LINK180 elements are discretized into 25 3 25 3 25 mm discrete elements along the length, depth, and width directions to get reliable solutions, as shown in Figure 2 (Kaya and Anil, 2021;Pandimani et al, 2021a, b).…”

Section: E C 5 Youngs Modulus Of Concrete In Mpamentioning

confidence: 99%

“…This element can effectively predict concrete's cracking and crushing phenomenon in three mutually perpendicular directions. This element also comprises plasticity, large deflection, stress stiffening, creep and swelling properties (Wolanski, 2004; Yousaf et al ., 2017; Pandimani et al. , 2021a, b; Naser et al ., 2021; Abuodeh et al ., 2021; Hawileh et al ., 2013).…”

Section: Numerical Modelingmentioning

confidence: 99%

Computational modeling and simulations for predicting the nonlinear responses of reinforced concrete beams

Pandimani¹

2023

MMMS

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PurposeThe ultimate capacity and ductility behavior of a reinforced concrete (RC) beam generally depends on its constituent material properties. This study aims to use ANSYS to accentuate the nonlinear parametric finite element (FE) simulations of RC sections under monotonic loading.Design/methodology/approachThe concrete matrix and steel reinforcement are the primary constituent materials of RC beams. The material properties such as tensile reinforcement area, tensile bars yield strength, concrete compressive strength and strain rate in tensile reinforcement at nominal strength have significantly influenced the ultimate response of RC beams. Therefore, these intensive parameters are considered in this study to ascertain their effect on the RC beam's ultimate behavior. The nonlinear response up to the ultimate load capacity and the crack evolutions of RC beams are predicted efficiently.FindingsThe parametric study reveals that increasing the tensile steel reinforcements (from Ast = 213–857 mm2) significantly improves the ultimate load capacity by 229% and yield deflections by 20%. However, it declines the ultimate deflection by 47% and ductility by 56% substantially. Varying the strain limit (?tn = 0.010–0.0015) of tensile reinforcement has proficiently increased the ultimate load-resisting capacity by 20%, whereas the ductility declined by 62%. When the concrete strength increases (from fck = 25–65 MPa), the cracking load increases profoundly by 51%, whereas the ultimate capacity has found an insignificant effect.Originality/valueThe load-deflection response plots extracted from the proposed numerical model exhibit satisfactory accuracy (less than 9% deviation) against the experimental curves available in the literature, which emphasizes the proficiency of the proposed FE model.

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“…Two-node LINK 180 spar element having three degrees of freedom (DOF) at each node is used to model the longitudinal and transverse steel reinforcements (Sayed, 2019; Hamrat et al , 2020; Nwankwo and Ede, 2020; Yousaf et al , 2017). The steel reinforcements are assumed to be bilinear isotropic with identical elastic–perfectly plastic behaviour in compression and tension, as shown in Figure 6(b).…”

Section: Nonlinear Finite Element Analysismentioning

confidence: 99%

Nonlinear modelling and finite element analysis on the load-bearing capacity of RC beams with considering the bond–slip effect

Pandimani

Raju

Geddada

2021

JEDT

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Purpose This paper aims to present nonlinear numerical simulations using the versatile finite element (FE) analysis tool ANSYS and theoretical analysis based on code provisions to assess the load-carrying capacity of reinforced concrete (RC) beams under two-point monotonic static loadings. Design/methodology/approach Four quarter-size FE models with load and geometry symmetry conditions were constructed, the load-bearing capacity and associated mid-span deflections at critical points are verified against the full-scale experimental RC beams available in the literature. These developed FE models incorporated the tension stiffening effects and bond–slip behaviour. Theoretical analyses based on Indian standard code IS: 456–2000 and ACI 318–19 were also carried to verify the experimental and numerical predicted moments at critical loading points. Findings The load-deflection curves predicted through FE models exhibit closer corroboration with the experimental curves throughout the loading history. The contour plots for deflections, concrete principal stresses, reinforcement yield stresses are satisfactorily predicted by the FE models, which reveal the complete information of nonlinear behaviour of RC beams. The developed model well captured the initial and progressive crack patterns at each load increments. Practical implications The FE modelling is an efficient, valid and economical tool that is an alternative to the expensive experimental program and can be used to explore, analyse and fully understand the nonlinear response of RC beams under static loadings. Originality/value The ultimate moment capacity evaluated based on ACI 318–19 code provision show a better correlation with the experimental data as compared to the IS: 456–2000 code provision. The ultimate loads and associated centre-span deflections predicted by RN-2, RN-3, RB-12 and RB-16 FE model show a discrepancy of 1.66 and –0.49%, –4.68 and –0.60%, –9.38 and –14.53% and –4.37 and 4.21%, respectively, against the experimental results, which reveals that the developed ANSYS FE models predict consistent results and achieved a reasonable agreement with the experimental data.

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Force- and Displacement-Controlled Non-linear FE Analyses of RC Beam with Partial Steel Bonded Length

Cited by 13 publications

References 9 publications

Programmable Granular Metamaterials for Reusable Energy Absorption

Programmable Granular Metamaterials for Reusable Energy Absorption

Computational modeling and simulations for predicting the nonlinear responses of reinforced concrete beams

Nonlinear modelling and finite element analysis on the load-bearing capacity of RC beams with considering the bond–slip effect

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