Applied Element Simulation of RC Structures under Cyclic Loading

Meguro, Kimiro; Tagel-Din, Hatem

doi:10.1061/(asce)0733-9445(2001)127:11(1295)

Cited by 106 publications

(60 citation statements)

References 5 publications

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“…AEM discretizes the domain into a grid of rigid finite elements with six degrees of freedom, three translations and three rotations that represent the rigid body motion of the element located in the geometric centre of the element as shown in Figure 1. The connection of the elements is established through a mesh of springs on the contact faces of the elements, Meguro and Tagel-Din [18]. Two elements shown in Figure 1-b are assumed to be connected by one normal and two shear springs located at contact points, which are distributed around the elements edges.…”

Section: Applied Element Methods Overviewmentioning

confidence: 99%

Application of Aem in Progressive Collapse Dynamics Analysis of R.C. Structures

El-Mahdy¹,

El-Kasaby²,

Abusafa³

et al. 2017

CEJ

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The Finite Element Method (FEM) and the other numerical strategies are viably actualized in linear and non-linear analysis of structures. Recently, a new displacement based on Applied Element Method (AEM) has been developed. It is applicable for static and dynamic for both linear and non-linear analysis of framed and continuum structures. In AEM, the structural member is partitioned into virtual elements connected through normal and shear springs representing stresses and strains of certain portion of structure. FEM assumes the material as continuous and can indicate highly stressed region of structure, however it is difficult to model separation of element unless crack location is known. The main advantage of AEM is that it can track the structural collapse behavior going through all phases of the application of loads.In the current research, the application of AEM is illustrated through a non-linear dynamic analysis. Progressive collapse simulation is conducted using Extreme Loading for Structures software (ELS), which follows the AEM. The experimental and analytical works carried by Park et al. [17 and 28] for 1/5 scaled 3 and 5 stories reinforced concrete structures are used for verification. Good matching between the experimental and numerical results has been obtained using ELS. Therefore, it can be confirmed that ELS is capable in simulating the structures' behavior up to collapse.Furthermore, a study has been made to investigate the effect of considering the floor slabs on progressive collapse. The results show that considering slab in progressive collapse analysis of multistory buildings is important as neglecting the slabs' contribution leads to incorrect simulation and uneconomic design.

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Section: Applied Element Methods Overviewmentioning

confidence: 99%

Application of Aem in Progressive Collapse Dynamics Analysis of R.C. Structures

El-Mahdy¹,

El-Kasaby²,

Abusafa³

et al. 2017

CEJ

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“…The major advantage of the AEM is its capacity to simulate different collapse modes of structures and the structure's behaviour from zero loading until collapse, including the elastic phase, opening and propagation of cracks, yielding of reinforcement bars and separation and collision of elements. However, the computation time required to simulate large structures' behaviour from zero loading until collapse might become very large due to the necessity of small time increments, to ensure numerical stability (Meguro and Tagel-Din [10][11][12] and Tagel-Din and Meguro [13][14][15]). …”

Section: Introductionmentioning

confidence: 99%

Progressive Collapse Analysis of 2-D Rc Frames Using Aem

El-Mahdy¹,

El-Kasaby²,

Abusafa³

et al. 2017

CEJ

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Numerical simulation of a progressive collapse of structures using computer has a very actual apprehension for structural engineers due to their interest in structures veracity estimation. This simulation helps engineers to develop methods for increasing or decreasing the progressive failure. Finite Element Method (FEM) is the most computer simulation analysis currently used to perform a structural vulnerability assessment. Unfortunately, FEM is not able to automatically analyze a structure after element separation and collision which has a great effect on a structure's performance during collapse. For instances, a bombing load can cause damage to a main supporting column in a structure, which will cause debris flying at a very high velocity from the damaged column. This debris can cause another local failure in another column upon impact and lead to the progressive collapse of the whole structure. A new simulation technique, which was developed in 1995 as part of Tagel-Din's doctoral research, called Applied Element Method (AEM) can simulate the structure's behaviour from zero loading until collapse, through the elastic phase, opening and propagation of cracks, yielding of reinforcement bars and separation and collision of elements. This method is used in Extreme Loading for Structures software (ELS) by Applied Science International (ASI). In the current paper, a brief description of the AEM is given. Also, numerical modelling based on two experimental studies available in the literature conducted by Ahmadi et al. [1] and Yi et al. [2] are generated using ELS. These models are used to confirm the capability of AEM in simulation the progressive collapse behaviour of structures. Also, the models are utilized to examine and measure the structural resisting mechanisms of reinforced concrete structures against progressive collapse. The obtained numerical results indicated that, ELS can accurately model all structural behaviour stages up to collapse. A better agreement between the experimental and numerical results is observed. Moreover, the results obtained with ELS indicated an enhanced agreement with other software packages such as; OpenSees, Ansys, Abacus, and MSC Marc.

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“…Therefore, in the current study, the numerical analysis was carried out using the Applied Element Method. The Applied Element Method is based on discrete crack approach and is capable of following the structure's behavior to its total collapse Meguro and Tagel-Din 2001;Tagel-Din 2002;Meguro and Tagel-Din 2003;Tagel-Din and Rahman 2004;Galal and ElSawy 2010;Sasani and Asgitoglu 2008;Salem et al 2011;Park et al 2009;Helmy et al 2009;Helmy et al 2012;Helmy et al 2013;Sasani 2008;Wibowo 2009;Salem 2011;Salem and Helmy 2014) …”

Section: Introductionmentioning

confidence: 99%

Collapse Analysis of Utatsu Ohashi Bridge Damaged by Tohuku Tsunami using Applied Element Method

Salem

Mohssen²,

Kosa

et al. 2014

ACT

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The 2011 Tohuku tsunami on the east coast of Japan resulted in killing more than 15,000 people and missing more than 2,500 people, washing away of more than 250 coastal bridges and loss of US$235 billion. Collapse of coastal bridges due to tsunami impact represents a huge obstacle for rescue works. Therefore, in the current study, the collapse of Utatsu Ohashi bridge is numerically studied. The analysis is carried out using the Applied element Method due to its advantages of simulating structural progressive collapse. The AEM is a discrete crack approach, in which elements can be separated, fall and collide to other elements in a fully nonlinear dynamic scheme of computations. The Utatsu Ohashi bridge collapse was successfully simulated using AEM. It was numerically found that the amount of trapped air between deck girders during tsunami had a significant effect on the behavior of the bridge. This is attributed to the buoyant force accompanied with the trapped air. A simplified method for estimating trapped air was assumed and proved to give reasonable results compared to reality. Three different solution examples for mitigating collapse of similar existing bridges were introduced and applied to Utatsu Ohashi bridge case and found to be efficient for preventing collapse.

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Applied Element Simulation of RC Structures under Cyclic Loading

Cited by 106 publications

References 5 publications

Application of Aem in Progressive Collapse Dynamics Analysis of R.C. Structures

Application of Aem in Progressive Collapse Dynamics Analysis of R.C. Structures

Progressive Collapse Analysis of 2-D Rc Frames Using Aem

Collapse Analysis of Utatsu Ohashi Bridge Damaged by Tohuku Tsunami using Applied Element Method

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