scholarly journals Finite Element Method Analysis Applied to the Study of a Corner Joint in Reinforced Concrete Structures

2021 ◽  
Vol 7 (3) ◽  
pp. 1-17
Author(s):  
Dr. Eng. Guillaume Hervé POH’SIE* ◽  
◽  
Eng. Davy Marcel Bile Bile Abessolo ◽  
Eng. Giuseppe Cardillo ◽  
Prof. Carmelo Majorana ◽  
...  
Keyword(s):  
Structural Model ◽  
Load Condition ◽  
Nonlinear Behavior ◽  
Joint Models ◽  
Eurocode 2 ◽  
Concrete Damage ◽  
External Node ◽  
Vertical Bars ◽  
Lateral Displacements ◽  
Method Analysis

The principal objective for this work was to extend the field of application of FEM to space frame beam-column connections under static loading and with lateral displacements. A four-storey building was modelled under static load condition. Horizontal and vertical structural elements were designed according to Eurocode 2. In order to understand the behavior of the external node made by under column, two beam and upper column, two models using correct boundary condition and nonlinear behavior of materials have been done using Abaqus Software The analysis was performed on an interior and an exterior joint models each in two conditions: unconfined and confined joint varying the distributions of number of stirrups for the beam reinforcement and the column reinforcement .A sup structural model to submit to numerical analysis have been performed, the Concrete Damage Plasticity model (CDPM) has been chosen for fit the nonlinear behavior for the concrete and the elastoplastic model has been adopted for the nonlinear behavior for the reinforcement (stirrups, longitudinal and vertical bars). The models were then verified against already existing and validated analytical results and results of experiments conducted on specimens.

THE EFFECT OF SHEAR REINFORCEMENT RATIO ON PRESTRESSED CONCRETE BEAMS SUBJECTED TO IMPACT LOAD

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Mohamad Elani ◽  
Yehya Temsah ◽  
Hassan Ghanem ◽  
Ali Jahami ◽  
Youmn Al Rawi
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Impact Load ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Shear Reinforcement ◽  
Dynamic Increase Factor ◽  
Concrete Damage ◽  
Different Response ◽  
The Impact

Structural elements subjected to impact loads have a different response than those subjected to static loads. This research studied the effect of using shear reinforcement to reduce the local damage occurred when an impact load applied on a prestressed concrete beam. An accurate finite element model was provided for the analysis using the advanced volumetric finite element modeling program (ABAQUS). The concrete material was defined using the built in concrete damage plasticity model (CDP), that considers the nonlinear behavior of concrete when subjected to dynamic loading. All material properties were modified using the dynamic increase factor (DIF) to consider the effect of impact loading. It was realized that the failure was concentrated in the impact zone. However, using shear reinforcement reduced the permanent damage occurred due to impact.

Non-Linear Analysis of Rheological Effects in Slender Composite Columns

2014 ◽  
Vol 578-579 ◽  
pp. 389-395
Author(s):  
E. Fenollosa ◽  
Ivan Cabrera ◽  
Ana Almerich-Chulia
Keyword(s):  
Axial Force ◽  
Bending Moment ◽  
Order Effects ◽  
Analysis Software ◽  
Composite Columns ◽  
Long Run ◽  
Eurocode 2 ◽  
Lateral Displacements ◽  
Slender Columns ◽  
Effects Assessment

A thorough analysis of slender columns under axial force and bending moment requires second order effects assessment. Concrete’s creep is one of the factors that increase lateral displacements of the bar in the long run. This phenomenon propitiates the instability and reduces its bearing capacity. This paper shows a procedure for assessing rheological effects based on Eurocode 2 method. This procedure will be added to structural analysis software which takes into consideration geometrical and mechanical non-linearity. As an example interaction diagrams for concrete-encased composite columns with different slenderness values are obtained. These diagrams will demonstrate that rheological effects have a greater influence as axial force eccentricity and slenderness values increase.

Seismic Safety Evaluation of High Arch Dams Using Concrete Damage Theory

2010 ◽  
Vol 29-32 ◽  
pp. 1476-1480
Author(s):  
Zhi Guo Niu ◽  
Jun Lu ◽  
Ri You
Keyword(s):  
Safety Evaluation ◽  
Nonlinear Behavior ◽  
Maximum Principal Stress ◽  
Arch Dam ◽  
Seismic Safety ◽  
Arch Dams ◽  
Earthquake Load ◽  
Concrete Damage ◽  
Damage Theory ◽  
High Arch Dams

To reasonably evaluate the seismic behavior of high arch dams, a damage plasticity model is adopted to simulate the dynamic nonlinear behavior of dam concrete for a hydropower station. Combining with the viscous-spring boundary and compressibility reservoir model, the maximum principal stress on upstream and downstream surfaces is obtained. The results show that the effects of material nonlinearity damage on the dynamic response of the arch dam are significant under earthquake load.

Effect of Semi-Rigid Connection and Pole in Different Flat on the Overall Steady-State Load-Bearing Capacity of the Steel Tubular Scaffold with Couplers

2010 ◽  
Vol 168-170 ◽  
pp. 222-225
Author(s):  
Hou Xian Zhang ◽  
Jian Jin
Keyword(s):  
Steady State ◽  
Bearing Capacity ◽  
Nonlinear Analysis ◽  
Structural Model ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Tubular Scaffold ◽  
Overall Stability ◽  
Rigid Connection ◽  
Vertical Bars

Nonlinear analysis of the steady-state load-bearing capacity of steel tubular and the steady-state load-bearing capacity of scaffold was simulated by ANSYS considering semi-rigid connection and pole in different flat. Quantitative standard of the steady-state load-bearing capacity to the steel tubular and the steel tubular scaffold with couplers is used in ANSYS. The effect of semi-rigid connection on the overall steady-state load-bearing capacity of the steel tubular scaffold with couplers is great. The effect of pole in different flat on the overall steady-state load-bearing capacity of the steel tubular scaffold with couplers is smaller. It’s generally recognized that nodes of vertical bars and horizontal bars of steel tubular scaffold by fasteners is not rigid, but semi-rigid; is not in the same plane, but in a different surface. This structural model directly affects the steady-state load-bearing capacity of scaffold. In this paper, ANSYS software was used for nonlinear analysis of steel tubular scaffold, the same models with experimental value [4] was used to establish standards for determining the instability load [1] [2], to determine the effect of bar coplanar and semi-rigid connections on steel tubular scaffolding overall stability capacity.

scholarly journals ANÁLISE ESTRUTURAL DINÂMICA DE GRADE DE PROTEÇÃO DE TURBINA DE USINA HIDROELÉTRICA

e-xacta ◽  
2016 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Lucas Giovanetti ◽  
Carlos Alberto Chaves ◽  
Álvaro Manoel de Souza Soares
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Reynolds Number ◽  
Water Flow ◽  
Structural Model ◽  
Turbulent Regime ◽  
Floating Bodies ◽  
Structure Interaction ◽  
Hydroelectric Plants ◽  
Vertical Bars

<p>Grades são equipamentos de grande importância porque são responsáveis pela proteção das turbinas de usinas hidroelétricas contra impacto de corpos flutuantes. O objetivo do presente trabalho é analisar grades submetidas à ação de fluxo de água. Ou seja, analisar as respostas da estrutura e o comportamento do escoamento da água utilizando os cálculos de dinâmica de estruturas acopladas às técnicas de dinâmica de fluidos computacional (CFD), para um regime turbulento, mediante o uso do software comercial CFX versão 14. Tais análises são elaboradas mediante o processo de interação fluido-estrutura. Um modelo estrutural simplificado das barras verticais das grades é elaborado a partir de dados de projeto conhecidos. A partir desse modelo define-se um volume de controle que representa o escoamento do fluido. Devido ao número de Reynolds calculado, utiliza-se o modelo de turbulência para obtenção dos resultados tais como tensões e deslocamentos nas barras verticais; e perfil de velocidades do escoamento.</p><p>Abstract</p><p>Tashracks are very important equipment because they are responsible for protecting turbines of hydroelectric plants against floating bodies. The objective of this study is to analyze trashracks submitted by action of water flow. In other words, to analyze the responses of the structure and the behavior of water flow using dynamic of structures calculations coupled with computational fluid dynamics techniques (CFD) for a turbulent regime, through the use of commercial software CFX version 14. This analysis is elaborated by the process of fluid structure interaction. A simplified structural model of vertical bars is defined from other similar projects. For this model is defined a volume of control that represents fluid flow. Due to the Reynolds number calculated, it is utilized a turbulence model in order to obtain the results. These results are: stresses and displacements of vertical bars; and profile of velocities of flow. The results are analyzed and discussed.</p>

A Study on the Nonlinear Dynamic Characteristics of Gas Turbine Engine Components

2017 ◽  
Author(s):  
Narayana Murty Pilli ◽  
Lakshman Kasina ◽  
Kondaiah Bommisetty ◽  
Sreenivas Karri ◽  
Kotur Srinivasan Raghavan
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Characteristics ◽  
Nonlinear Behavior ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Vital Role ◽  
Joint Models ◽  
Turbine Engine ◽  
Aero Engines

Rotating as well as static components of aero engines such as rotors and casings must be capable of withstanding vibrations which arises from various engine order excitations. HCF is attributed as one of the major failures due to its high crack propagation rate. The tolerances to vibration have become a key point to avoid resonance in operating range. Analytical predictions of individual components gives better accuracy and good agreement with test data. However, when the components are assembled, the accuracy of analyses can considerably depreciate since models describing stiffness and friction properties of joints are linearized. In such conditions proper predictions of dynamic response becomes difficult and may lead to under prediction or over prediction of dynamic response. A nonlinear analysis is required to study the influence of joints flexibility on dynamic response. In this paper different nonlinear joint models are investigated to assess the dynamic behavior of the contact interface in terms of slipping and sticking contact parameters. The study shows significant changes over dynamic characteristics when compared to linear analysis. From this study, it is evident that nonlinear behavior of the contact in dynamic analysis phase due to slip and separation plays vital role over the dynamic characteristics of the component. This study emphasizes to consider physical behavior of joints in dynamic analysis to avoid catastrophic HCF failures.

Modular Assembly of Volterra Models of Nonlinear Physical Systems

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Eliot Motato ◽  
Clark Radcliffe
Keyword(s):  
Structural Model ◽  
Nonlinear Behavior ◽  
Physical Models ◽  
Modular Assembly ◽  
Physical Systems ◽  
Assembly Algorithm ◽  
Volterra Models ◽  
Assembly Method ◽  
Modular Model ◽  
Model Distribution

The modular model assembly method (MMAM) is an energy based model distribution and assembly algorithm that distributes and assembles model information through computer networks. Using the MMAM linear and affine physical system, models can be distributed and assembled using dynamic matrices. Though the MMAM procedure can be used for a large class of systems, linear model dynamic matrices cannot be used to represent nonlinear behavior. This work is an extension of the MMAM to assemble nonlinear physical models described through Volterra expansions. Volterra expansions are models representations of smooth nonlinearities. Using the approach proposed here, complex assemblies of nonlinear physical models can be executed recursively while hiding the topology and characteristics of their structural model subassemblies.

scholarly journals Finite element analysis of the effect M/V ratios on punching shear strength of edge slabcolumn connections of flat plate structure

2019 ◽  
Vol 276 ◽  
pp. 01012
Author(s):  
I Ketut Sudarsana ◽  
I Gede Gegiranang Wiryadi ◽  
I Gede Adi Susila
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Strength ◽  
Flat Plate ◽  
Nonlinear Behavior ◽  
Punching Shear ◽  
Element Analysis ◽  
Plate Structure ◽  
Concrete Damage ◽  
Good Agreement

The occurrence of unbalanced moment in edge slab-column connections of flat plate structure cannot be avoided and increase the slab shear stress around the column. This paper investigates the effect of M/V ratio on punching shear strength of edge column-slab connections using finite element analysis. The Concrete Damage Plasticity (CDP) and truss model in Abaqus were used to model the nonlinear behavior of concrete and reinforcement, respectively. Ten values of the M/V ratio were applied to a subassembly edge connection model which was part of a properly design of a 5 story flat plate structure. The shear strength prediction of ACI 318-14 code on the effect of unbalanced moment in edge column-slab connection was also studied. The analysis results show that the effect of unbalanced moment on shear strength is not significant for M/V ratio less than 0.3. However, for M/V ratio greater than 0.3, the shear strength is reduced in an exponential order. The ACI 318-14 code overestimates prediction on connection’s shear strength for the M/V ratio less than 0.3. The code predictions are in a good agreement with the analysis results for the edge connection with the M/V ratio greater than 0.3.

Dynamic Characterization of a Two Degree of Freedom Planetary Gearbox During Varying Load Conditions

2019 ◽  
Author(s):  
Claudia González-Cruz ◽  
Juan Jauregui ◽  
Marco Ceccarelli
Keyword(s):  
Load Condition ◽  
Nonlinear Behavior ◽  
Degree Of Freedom ◽  
Operating Speed ◽  
Dynamic Characterization ◽  
Radial Vibrations ◽  
Planetary Gearbox ◽  
Input Shaft ◽  
Two Degree Of Freedom

Abstract This paper presents the dynamic characterization of a two degree of freedom planetary gearbox prototype during the variation of the load condition. Tests with varying load are developed at three different operating speeds of the input shaft: 190, 380 and 590 rpm. The dynamic torques and vibrations on the input and output shafts are acquired during the experiments, such as the angular velocity of the output shaft. The experimental data are analyzed to evaluate the dynamics of the system during the exchange of operation between the first and second DOF operation. Then, the radial vibrations are analyzed during the operation of the second DOF by means of a methodology using different signal processing tools: first, the continuous wavelet transform is used to identify the nonlinear behavior and the main frequency content of the system; then, the vibrations are filtered by means of passband filters in order to keep the main frequencies of the system and delete any other; finally, the filtered signals are analyzed with both, the Kuramoto’s order parameter to quantify the dynamic synchronization of the gearbox and the phase diagram to characterize its stability. The results demonstrates the utility of the second DOF in the design of the planetary gearbox in order to avoid excessive torques in the components of the system. Furthermore, it is found that the synchronization of the system increases at higher operating speed, however, the system becomes unstable as the operating speed is increased.

An Alternative Method to Optimize Octagonal-Ring Transducer

2012 ◽  
Vol 184-185 ◽  
pp. 1517-1520
Author(s):  
Yu Jing Sun ◽  
Miao Hao ◽  
Yang Liu ◽  
Cheng Ming Liu
Keyword(s):  
Load Condition ◽  
High Sensitivity ◽  
Design Criterion ◽  
Stress Distributions ◽  
Experimental Calibration ◽  
Calibration Experiment ◽  
Stress Prediction ◽  
Relative Errors ◽  
Method Analysis ◽  
Type Transducer

Nowadays there is no precision theory to determine the parameters of an octagonal ring type transducer with high sensitivity and adequate stability according to its load condition. Stress design criterion and a method to optimize octagonal ring based on finite element method (FEM) are proposed. Full-load stress distributions in P and F directions of 3 octagonal-ring transducers are studied by FEM, and the stress prediction precision of FEM is validated by experimental calibration. Experiment results suggest that the FEM predicted max stress is less than the stress design criterion both in P direction and in F direction. The average relative errors are all less than 20%. With fully loaded stress distributions of octagonal-ring sensor, results from FEM are of contribution to optimize transducer structure. Compared with conventional experimental method, analysis based on FEM is efficient and intuitionistic, and can supply theoretical guidance to design a transducer.

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