Influence of actual plastic hinge placement on the behavior of ductile frames

Fraldi, Massimiliano; Gesualdo, Antonio; Guarracino, Federico

doi:10.1631/jzus.a1400031

Cited by 18 publications

(5 citation statements)

References 18 publications

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“…Its range of validity is bounded by the hypothesis of linear elasticity. Further research will thus be needed to extend the proposed method also in the elasto-plastic range whereas the response of the unit cell has to be analysed by approximated methods as those reported in Fraldi et al (2010Fraldi et al ( , 2014 and Cennamo et al (2017).…”

Section: Resultsmentioning

confidence: 99%

A direct technique for the homogenization of periodic beam-like structures by transfer matrix eigen-analysis

Gesualdo

Iannuzzo

Penta

2018

Lat. Am. j. solids struct.

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To homogenize lattice beam-like structures, a direct approach based on the matrix eigen-and principal vectors of the state transfer matrix is proposed and discussed. The Timoshenko couple-stress beam is the equivalent continuum medium adopted in the homogenization process. The girders unit cell transmits two kinds of bending moments: the first is generated by the couple of the axial forces acting on the section nodes, the other one is due to the moments directly applied at the node sections by the adjacent cells. This latter moment is modelled as the resultant of couple-stress. The main advantage of the method consists in to operate directly on the sub-partitions of the unit cell stiffness matrix. Closed form solutions for the transmission principal vectors of the Pratt and X-braced girders are also attained and employed to calculate the stiffnesses of the related equivalent beams. Unit cells having more complex geometries are analysed numerically. As a result, the principal vector problem is always reduced to the inversion of a well-conditioned (3 3)  matrix employing the direct approach. Hence, no ill-conditioning problems, affecting all the known transfer methods, are present in the proposed method. Finally, comparing the predictions of the homogenized models with the finite element (f.e.) results of a series of girder, a validation of the homogenization method is performed.

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Section: Resultsmentioning

confidence: 99%

A direct technique for the homogenization of periodic beam-like structures by transfer matrix eigen-analysis

Gesualdo

Iannuzzo

Penta

2018

Lat. Am. j. solids struct.

Self Cite

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“…Several methods for modeling masonry structures have been developed within Heyman's theory of Limit Analysis (LA), considering the masonry as rigid-unilateral material that can resist compressive loads but not tensile loads. Starting from the foremost works [11,12], the extension of traditional frame LA [13] approaches to the No-Tension (NT) materials has been widely discussed in the literature [14][15][16], and many studies have focused on this theoretical assumption, applying it to different types of historical vaulted construc-tions [17]) to vaults and domes. With respect to spiral staircases, some studies have also been conducted on solutions involving torsional actions.…”

Section: Current State Of the Researchmentioning

confidence: 99%

Masonry Spiral Stairs: A Comparison between Analytical and Numerical Approaches

et al. 2022

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The present paper applies the Linear Arch Static Analysis (LASA), which models the masonry material as unilateral, i.e., No-Tension material in the sense of Heyman, and the Safe Theorem of the Limit Analysis to the study of masonry spiral stairs. A comparison is made with a refined FE analysis of the same problem, obtained by means of the ANSYS Parametric Design Language (APDL). The objective is to prove that LASA can be a valid alternative to other more complex numerical methods, such as FE, especially when the modeling parameters, such as the boundary conditions, cannot be exactly defined. The case study of a small spiral staircase placed in the tower of Nisida, a small island close to Naples, Italy is taken into consideration. The results show that the LASA analysis provides results that fall within two limit FE cases in terms of stress and overall thrust, providing at the same time a meaningful insight into the equilibrium state of the structure.

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“…In particular, limit methods based on analytical formulae have received a lot of attention for similar problems in the past few years, especially from the researchers Fraldi et al [18,19] and Guarracino et al [20,21], whose research has been very enlightening to us.…”

Section: Introductionmentioning

confidence: 99%

Application of Numerical Simulation Methods in Solving Complex Mining Engineering Problems in Dingxi Mine, China

Zhang

et al. 2022

Minerals

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In the mining industry, with numerical simulation analysis of stope roof stability, stope exposed area computation, and pillar buckling collapse simulation, backfill body creep damage mechanism research is becoming the most popular method in the field of backfill mining techniques. In this paper, we first summarized and analyzed the current application status and the existing problems of numerical simulation for solving mining engineering technical problems; then, based on the practical engineering problems of mining phosphate rock resources under high and steep rock slopes (HSRS), we carried out a true-3D numerical simulation study for different underground mining methods, to determine the appropriate mining method. Therefore, this paper, taking Dingxi Mine in China as an example, highlights the advantages of the backfill mining method with a high and steep slope; meanwhile, it also points out how to improve the accuracy of a numerical simulation and make it more consistent with the actual situation of the mining engineering application site. This paper only serves as a guide, in order to start a conversation, and we hope many more experts and scholars will become interested and engaged in this field of research.

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Influence of actual plastic hinge placement on the behavior of ductile frames

Cited by 18 publications

References 18 publications

A direct technique for the homogenization of periodic beam-like structures by transfer matrix eigen-analysis

A direct technique for the homogenization of periodic beam-like structures by transfer matrix eigen-analysis

Masonry Spiral Stairs: A Comparison between Analytical and Numerical Approaches

Application of Numerical Simulation Methods in Solving Complex Mining Engineering Problems in Dingxi Mine, China

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