scholarly journals BEHAVIOUR OF ALUMINIUM ALLOY STRUCTURES UNDER FIRE

2004 ◽  
Vol 10 (3) ◽  
pp. 183-190 ◽  
Author(s):  
Beatrice Faggiano ◽  
Gianfranco De Matteis ◽  
Raffaele Landolfo ◽  
Federico M. Mazzolani
Keyword(s):  
High Temperatures ◽  
Aluminium Alloys ◽  
Global Analysis ◽  
Frame Structure ◽  
Structural Behaviour ◽  
Technical Literature ◽  
Finite Element Program ◽  
Element Program ◽  
Portal Frame Structure ◽  
Hardening Factor

In the paper the attention is focused on the influence of high temperatures on the mechanical properties of the aluminium alloys selected by Eurocode 9 for structural uses. Therefore, based on the analysis of existing data taken from technical literature, the variation of the Young's modulus, the conventional yielding strength, the ultimate strength, the hardening factor and the material ultimate strain are represented as a function of the temperature. A mechanical model, based on the well‐known Ramberg‐Osgood formulation, which appropriately takes into account the peculiarities of such materials at high temperatures, is provided. In particular, the combined influence of the hardening factor and temperature on the material stress‐strain relationship is considered and analysed. Then, the proposed model has been introduced in a finite element program, devoted to the global analysis of structures under fire. Finally, the results obtained for a simple portal frame structure, designed with different aluminium alloys, are presented, showing the valuable effect of the material modelling on the structural behaviour of aluminium structures under fire.

scholarly journals Simultaneous Influence of the Track Axis Curvature and the Support Line Obliquity at Railway Bridge Superstructures with Steel Beams Embedded in Concrete

2018 ◽  
Vol 7 (2) ◽  
pp. 77-90
Author(s):  
Stănescu Răzvan Marian ◽  
Stan Oana Mihaela
Keyword(s):  
Program Analysis ◽  
Steel Beams ◽  
Support Line ◽  
Design Code ◽  
Technical Literature ◽  
Finite Element Program ◽  
Railway Bridges ◽  
Bridge Superstructures ◽  
Element Program ◽  
Simultaneous Influence

Abstract For new railway bridges with small spans (L ≤ 35.00 m) superstructures with steel beams embedded in concrete are recommended and used, which can ensure the requirements of strength and especially stiffness, regardless of velocity. In all the design prescriptions used so far for superstructures with steel beams embedded in concrete, and even in the technical literature, there is little information and data on the influence of the support line obliquity and the track axis curvature in the design and calculation of these types of structures. In the design code, if certain conditions related to the geometry of the superstructure are met (obliquity, curvature) the calculation is a simplified one, made on a single isolated longitudinal beam of the deck; otherwise, if the conditions are not met, finite element program analysis is recommended. The article aims to study the situations in which the requirements of the design prescriptions are not met.

scholarly journals Behavior of Mortarless Wall Subjected to In-Plane Combine Loading

2011 ◽  
Vol 264-265 ◽  
pp. 1746-1751 ◽  
Author(s):  
N.A. Safiee ◽  
M.S. Jaafar ◽  
Jamal Noorzaei
Keyword(s):  
Finite Element ◽  
Shear Loading ◽  
Combined Loading ◽  
Combine Loading ◽  
Interface Element ◽  
Structural Behaviour ◽  
Element Analysis ◽  
Finite Element Program ◽  
Plane Element ◽  
Element Program

The ability of mortarless wall to restrain/sustain lateral load become important aspect to be consider in the design of wall. Therefore, this paper presents analyses of mortarless wall subjected to in-plane combined loading using finite element programs. The developed 2D finite element program is used in this research. The finite element models are developed based on micro modelling approach where each constituent of masonry (block and dry joint) connected each other by joints at their actual position. Eight nodded isoparametric plane element and six nodded zero thickness isoparametric interface element are used to represent block unit and dry joint respectively. The developed models are analysed under nonlinear environment. The most relevant results concern the strength response of the dry joint masonry walls subjected to in-plane combined compressive and shear loading. The results of finite element analysis compared with corresponding experimental results and its show good agreement. Parametric study also performed to consider the important parameters that effect the design of wall under combined loading. Significant features of the structural behaviour, ultimate capacity and observed failure mechanisms are addressed and discussed.

Dynamic Behaviour of a Light Trailer Chassis

2005 ◽  
Author(s):  
Vagner Grison ◽  
Walter J. Paucar Casas
Keyword(s):  
Dynamic Behaviour ◽  
Global Analysis ◽  
Singular Stress ◽  
Structural Dynamic ◽  
Finite Element Program ◽  
Element Program ◽  
Rigid Model ◽  
Numerical Tools ◽  
Critical Regions ◽  
Resultant Forces

In this work numerical tools of simulation are applied to analyze the structural dynamic behavior of a light trailer passing through a secondary highway. After the dynamic analysis of the rigid model is realized, the resultant forces are obtained in the points of attachment between the springs and the chassis. These responses serve as input for a global analysis of the simplified model in a finite element program, making possible the identification of the most critical regions of the structure. Next, a more detailed local model of the critical region is created in order to evaluate singular stress concentration points. This method named global-local serve to obtain detailed results on structural analysis through a reduced number of elements. These results supply important information to the designer, making possible that modifications in the design can be best realized to improve the performance of the product.

scholarly journals Influence of structural irregularities on seismic performance of RC frame buildings

2021 ◽  
Vol 1 (1) ◽  
pp. 70-87
Author(s):  
Krishna Ghimire ◽  
Hemchandra Chaulagain
Keyword(s):  
Seismic Vulnerability ◽  
Time History ◽  
Frame Structure ◽  
Rc Frame ◽  
Building Structures ◽  
Functional Requirements ◽  
Finite Element Program ◽  
Element Program ◽  
Rc Frame Buildings ◽  
Structural Irregularities

Irregular building structure is frequently constructed across the globe for fulfilling aesthetic as well as functional requirements. The structures with irregularities are the common building type in earthquake-prone country like Nepal. However, a post-earthquake reconnaissance survey reports revealed the high seismic vulnerability of the building with structural irregularities. In this context, the present study explores the influence of structural irregularities on performance of reinforced concrete (RC) frame structure. To this end, the structural irregularities are created in in the building structures. The geometrical irregularities are created by removing the bays in different floor levels. Likewise, the effect due to mass irregularities are studied by considering the swimming pool and game house at different floor levels. Furthermore, the stiffness irregularities are formulated by removing the building columns at different sections. All these irregularities are studied analytically in finite element program with 3-D structural models. The numerical analysis is done with non-linear static pushover and time history analysis. The results are analyzed in terms of fundamental time period, storey shear, storey displacement, drift and overturning moment. The results indicate that the level of irregularities significantly influenced the behavior of structures.

Friction Force and Stresses Analysis for Contact of Assembled Details

2006 ◽  
Vol 113 ◽  
pp. 334-338
Author(s):  
Z. Dreija ◽  
O. Liniņš ◽  
Fr. Sudnieks ◽  
N. Mozga
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Plastic Deformation ◽  
Friction Force ◽  
Sliding Friction ◽  
Friction Model ◽  
Contact Interface ◽  
Finite Element Program ◽  
Elastic Plastic ◽  
Element Program

The present work deals with the computation of surface stresses and deformation in the presence of friction. The evaluation of the elastic-plastic contact is analyzed revealing three distinct stages that range from fully elastic through elastic-plastic to fully plastic contact interface. Several factors of sliding friction model are discussed: surface roughness, mechanical properties and contact load and areas that have strong effect on the friction force. The critical interference that marks the transition from elastic to elastic- plastic and plastic deformation is found out and its connection with plasticity index. A finite element program for determination contact analysis of the assembled details and due to details of deformation that arose a normal and tangencial stress is used.

scholarly journals The impact of drilling and slitting construction on damage field: evolution characteristics in low-permeability coal seam

2021 ◽  
Vol 37 ◽  
pp. 205-215
Author(s):  
Heng Chen ◽  
Hongmei Cheng ◽  
Aibin Xu ◽  
Yi Xue ◽  
Weihong Peng
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Damage Mechanics ◽  
Effective Strain ◽  
Secondary Development ◽  
Distribution Area ◽  
Finite Element Program ◽  
Element Program ◽  
Mining Face ◽  
The Impact

ABSTRACT The fracture field of coal and rock mass is the main channel for gas migration and accumulation. Exploring the evolution law of fracture field of coal and rock mass under the condition of drilling and slitting construction has important theoretical significance for guiding efficient gas drainage. The generation and evolution process of coal and rock fissures is also the development and accumulation process of its damage. Therefore, based on damage mechanics and finite element theory, the mathematical model is established. The damage variable of coal mass is defined by effective strain, the elastoplastic damage constitutive equation is established and the secondary development of finite element program is completed by FORTRAN language. Using this program, the numerical simulation of drilling and slitting construction of the 15-14120 mining face of Pingdingshan No. 8 Mine is carried out, and the effects of different single borehole diameters, different kerf widths and different kerf heights on the distribution area of surrounding coal fracture field and the degree of damage are studied quantitatively. These provide a theoretical basis for the reasonable determination of the slitting and drilling arrangement parameters at the engineering site.

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