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### Application of Iteration Perturbation Method in studying dynamic pull-in instability of micro-beams

*Lat. Am. j. solids struct.;11(7): 1078-1089, ILUS, GRA.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

In the present study, dynamic pull-in instability of electrostatically-actuated micro-beams is investigated through proposing the nonlinear frequency amplitude relationship. An approximate analytical expression of the fundamental natural frequency is presented by modern asymptotic approach namely It [...]3.

### Propagation of waves in micropolar generalized thermoelastic materials with two temperatures bordered with layers or half-spaces of inviscid liquid

*Lat. Am. j. solids struct.;11(7): 1090-1113, ILUS, GRA.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

The aim of the present paper is to study the propagation of Lamb waves in micropolar generalized thermoelastic solids with two temperatures bordered with layers or half-spaces of inviscid liquid subjected to stress-free boundary conditions in the context of Green and Lindsay (G-L) theory. The secula [...]4.

### Evaluation of dynamic behavior of waffle slab to gym center

*Lat. Am. j. solids struct.;11(7): 1114-1131, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

In Brazil, the use of reinforced concrete waffle slab in multi-story buildings is widespread nowadays. These buildings are projected for different purposes such as fitness centers, supermarkets, parking garages, offices and residential units. Simple activities as walking, skipping and jumping can ge [...]5.

### Fractional heat conduction with finite wave speed in a thermo-visco-elastic spherical shell

*Lat. Am. j. solids struct.;11(7): 1132-1162, ILUS.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

This problem deals with the thermo-elastic interaction due to step input of temperature on the stress free boundaries of a homogeneous visco-elastic orthotropic spherical shell in the context of a new consideration of heat conduction with fractional order generalized thermoelasticity. Using the Lapl [...]6.

### Physical and geometrical non-linear analysis of plane frames considering elastoplastic semi-rigid connections by the positional FEM

*Lat. Am. j. solids struct.;11(7): 1163-1189, ILUS.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

This study presents an alternative Finite Element formulation based on positions to model plane frames considering geometrical non-linear and elastoplastic behavior for members and semi-rigid connections. The formulation includes shear effects and allows the consideration of important mechanical beh [...]7.

### Optimization of concrete I-beams using a new hybrid glowworm swarm algorithm

*Lat. Am. j. solids struct.;11(7): 1190-1205, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

In this paper a new hybrid glowworm swarm algorithm (SAGSO) for solving structural optimization problems is presented. The structure proposed to be optimized here is a simply-supported concrete I-beam defined by 20 variables. Eight different concrete mixtures are studied, varying the compressive str [...]8.

### Reflection of attenuated waves at the surface of a fractured porous solid saturated with two immiscible viscous fluids

*Lat. Am. j. solids struct.;11(7): 1206-1237, ILUS.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

The mathematical model for wave motion in a fractured porous solid is solved for the propagation of harmonic plane wave along a general direction in 3-D space. The solution is obtained in the form of Christoffel equations, which are solved further to define the complex velocities and polarisations o [...]9.

### Design of a new high lateral resistance sleeper and performance comparison with conventional sleepers in a curved railway track by means of finite element models

*Lat. Am. j. solids struct.;11(7): 1238-1250, ILUS, GRA, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

The lack of lateral resistance in a curved railway track can produce misalignment problems due to the centrifugal forces when the trains pass through. Moreover, most of the times continuous welded rails (CWR) are used in nowadays railway tracks, which can induce the track buckling as a result of the [...]10.

### Ductility of reinforced lightweight concrete beams and columns

*Lat. Am. j. solids struct.;11(7): 1251-1274, ILUS, GRA, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

This paper presents analytical and experimental results on ductility of reinforced lightweight concrete beams and columns in the form of moment curvature relationships, and compares the response with that of normal reinforced concrete members. The experimental part is limited to flexural tests on be [...]11.

### Flexural behavior of general laminated composite and sandwich plates using a secant function based shear deformation theory

*Lat. Am. j. solids struct.;11(7): 1275-1297, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

A secant function based shear deformable finite element model is developed for the flexural behavior of laminated composite and sandwich plates with various conditions. The structural kinematics of the plate is expressed by means of secant function based shear deformation theory newly developed by t [...]12.

### Damage based constitutive model for predicting the performance degradation of concrete

*Lat. Am. j. solids struct.;11(6): 907-924, ILUS.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

An anisotropic elastic-damage coupled constitutive model for plain concrete is developed, which describes the concrete performance degradation. The damage variable, related to the surface density of micro-cracks and micro-voids, and represented by a second order tensor, is governed by the principal [...]13.

### Parametric resonance in concrete beam-columns

*Lat. Am. j. solids struct.;11(6): 925-945, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

A dynamic instability, called parametric resonance, is exhibited by undampedelastic beam-columns when under the action of pulsating axial force. The scope of the existing theory of parametric resonance is restricted to physically linear beam-columns undergoing finite lateral displacements. In this P [...]14.

### Strengthening of structurally damaged wide shallow RC beams using externally bonded CFRP plates

*Lat. Am. j. solids struct.;11(6): 946-965, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

Reinforced concrete wide shallow beams (WSBs) are commonly used in the joist flooring systems. The structural behavior of WSBs strengthened with carbon fiber reinforced polymer (CFRP) reinforcement was studied on isolated beams and as part of full-scale building. The effect of structural damage on t [...]15.

### Prediction of energy absorption capability in fiber reinforced self-compacting concrete containing nano-silica particles using artificial neural network

*Lat. Am. j. solids struct.;11(6): 966-979, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

The main objective of the present work is to utilize feedforward multi-layer perceptron (MLP) type of artificial neural networks (ANN) to find the combined effect of nano-silica and different fibers (steel, polypropylene, glass) on the toughness, flexural strength and fracture energy of concrete is [...]16.

### Progressive deformation behaviour of thin cylindrical shell under cyclic temperature variation using Combined Hardening Chaboche Model

*Lat. Am. j. solids struct.;11(6): 980-992, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

This study intends to evaluate thermal ratchetting deformation due to cyclic thermal loading along the axis of a smooth cylindrical shell. Two cases of progressive deformation behaviour are discussed for different loading methods. The aim of the first case is to recognize the shakedown behaviour of [...]17.

### Stress-based fatigue reliability analysis ofthe rail fastening spring clipunder traffic loads

*Lat. Am. j. solids struct.;11(6): 993-1011, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

Nowadays, the rail fastening systems play an important role for preserving the connection between the rails and sleepers in various conditions. In this paper, stress based concept is used to develop a comprehensive approach for fatigue reliability analysisof fastening spring clip. Axle load, speed a [...]18.

### An efficient formulation for linear and geometric non-linear membrane elements

*Lat. Am. j. solids struct.;11(6): 1012-1035, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

Utilizing the straingradient notation process and the free formulation, an efficient way of constructing membrane elements will be proposed. This strategy can be utilized for linear and geometric non-linear problems. In the suggested formulation, the optimization constraints of insensitivity to dist [...]19.

### Optimum dynamic analysis of 2D frames using free-scaled wavelet functions

*Lat. Am. j. solids struct.;11(6): 1036-1048, ILUS.*

SciELO Brasil |
Idioma:
Inglês

#### Resumo em inglês

This paper presents a wavelet-based scheme for dynamic analysis of 2-dimensional (2D) frames. In the proposed approach, free-scaled wavelet functions are developed for Multi-Degrees-of-Freedom (MDOF) structures, particularly, complex Chebyshev and simple Haar wavelets are implemented. A simple step- [...]20.

### Application of iteration perturbation method and Hamiltonian approach for nonlinear vibration of Euler-Bernoulli beams

*Lat. Am. j. solids struct.;11(6): 1049-1062, ILUS, TAB.*

SciELO Brasil |
Idioma:
Inglês