scholarly journals ANALYSIS OF A CONCRETE BUILDING EXPOSED TO NATURAL FIRE

2016 ◽  
Author(s):  
Ana Sauca ◽  
Thomas Gernay ◽  
Fabienne Robert ◽  
Jean Marc Franssen
Keyword(s):  
Numerical Analysis ◽  
Bending Moments ◽  
Structural Behaviour ◽  
Natural Fire ◽  
Shell Elements ◽  
Beam Elements ◽  
Floor Slabs ◽  
Temperature Development ◽  
Concrete Building ◽  
External Loads

In this paper is presented the analysis of a concrete building exposed to OZone fire. The temperature development in the elements and the structural behaviour were calculated in SAFIR using beam elements for the columns and beams and shell elements for the floor slabs. The first floor was modelled and the effects of action from the upper storeys are applied as external loads. It is shown how the numerical analysis allows understanding the behaviour of the structure when exposed to a natural fire until complete cooling by analysing the evolution of displacements, the distributions of bending moments in the beams, the membrane forces in the slab, and the stresses in the elements. All this detailed information would not be available from an experimental test.

Progressive Collapse Analysis of a Medium-Rise Circular RC Building Against Blast Loads

2016 ◽  
Author(s):  
Yousef Al-Salloum ◽  
Tarek Almusallam ◽  
Tuan Ngo ◽  
Hussein Elsanadedy ◽  
Husain Abbas ◽  
...  
Keyword(s):  
Progressive Collapse ◽  
Model Analysis ◽  
Element Formulation ◽  
Shell Elements ◽  
Critical Elements ◽  
Beam Elements ◽  
Floor Slabs ◽  
Rc Building ◽  
Progressive Collapse Analysis ◽  
Column Bases

This paper investigates the vulnerability of a typical medium-rise circular RC building against progressive collapse as a result of blast generated waves. The building is an eight storied (including one story basement) commercial complex. The likely blast threat scenario was identified by qualitatively assessing the vulnerability of the critical elements of the structure. LS-DYNA was used for the finite element modelling of the structure. The study presents local model analysis of one of its circular columns for which fluid-structure interaction through Alternate Lagrangian Eulerian (ALE) element formulation has been employed. The concrete volume in the columns was modeled using 8-node reduced integration solid hexahedron elements. The global model analysis was carried out to examine the overall response of the structure due to the failure of one of the critical columns. The building was modeled using beam and shell elements. The 2-node axial beam elements with tension, compression, torsion, and bending capabilities were employed to represent the RC beams and columns, whereas the four node quadrilateral and three node triangular shell elements were used to represent the core wall, floor slabs, retaining walls and facade. The column bases of the building were fixed at the level of raft slab. The results of the study are proposed to be used to control or prevent progressive collapse of RC buildings.

scholarly journals Temperature of Steel Columns under Natural Fire

10.14311/642 ◽  
2004 ◽  
Vol 44 (5-6) ◽  
Author(s):  
F. Wald ◽  
P. Studecká ◽  
L. Kroupa
Keyword(s):  
Mechanical Load ◽  
Fire Regimes ◽  
Structural Elements ◽  
Structural Behaviour ◽  
Fire Load ◽  
Natural Fire ◽  
Steel Columns ◽  
Standard Fire ◽  
Frame Building ◽  
Temperature Development

Current fire design models for time-temperature development within structural elements as well as for structural behaviour are based on isolated member tests subjected to standard fire regimes, which serve as a reference heating, but do not model natural fire. Only tests on a real structure under a natural fire can evaluate future models of the temperature developments in a fire compartment, of the transfer of heat into the structure and of the overall structural behaviour under fire.To study overall structural behaviour, a research project was conducted on an eight storey steel frame building at the  Cardington Building Research Establishment laboratory on January 16, 2003. A fire compartment 11×7 m was prepared on the fourth floor. A fire load of 40 kg/m2 was applied with 100 % permanent mechanical load and 65 % of imposed load. The paper summarises the experimental programme and shows the temperature development of the gas in the fire compartment and of the fire protected columns bearing the unprotected floors.

Finite Element Modeling of Unidirectional Non-Crimp Fabric for Manufacturing of Composites with Embedded Cabling

2013 ◽  
Vol 554-557 ◽  
pp. 484-491 ◽  
Author(s):  
Alexander S. Petrov ◽  
James A. Sherwood ◽  
Konstantine A. Fetfatsidis ◽  
Cynthia J. Mitchell
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Explicit Finite Element ◽  
Shell Elements ◽  
Beam Elements ◽  
Hybrid Finite Element ◽  
International Benchmarking ◽  
Unidirectional Glass ◽  
Forming Simulations

A hybrid finite element discrete mesoscopic approach is used to model the forming of composite parts using a unidirectional glass prepreg non-crimp fabric (NCF). The tensile behavior of the fabric is represented using 1-D beam elements, and the shearing behavior is captured using 2-D shell elements into an ABAQUS/Explicit finite element model via a user-defined material subroutine. The forming of a hemisphere is simulated using a finite element model of the fabric, and the results are compared to a thermostamped part as a demonstration of the capabilities of the used methodology. Forming simulations using a double-dome geometry, which has been used in an international benchmarking program, were then performed with the validated finite element model to explore the ability of the unidirectional fabric to accommodate the presence of interlaminate cabling.

Development and Validation of Offset Deformable Barrier Model with Beam Element

2011 ◽  
Vol 128-129 ◽  
pp. 1139-1142
Author(s):  
Li Bo Cao ◽  
Wen Tao Cheng ◽  
Xiang Nan Shi ◽  
Jie Chen ◽  
Li Quan
Keyword(s):  
Element Model ◽  
Local Deformation ◽  
Deformation Characteristics ◽  
Static Compression ◽  
Shell Elements ◽  
Sled Test ◽  
Beam Elements ◽  
Development And Validation ◽  
The Finite Element Model ◽  
Quasi Static Compression

According to GB/T 20913-2007 regulation, the finite element model of the offset deformable barrier (ODB) was built with beam and shell elements, and validated in the simulation of quasi-static compression test. In order to analyze the local deformation characteristics of the ODB model, a sled test was designed. A cylinder impactor of 110 mm in diameter was welded in front of the sled. It was used to impact the fixed ODB. The simulation model of this test was also built. The acceleration of the sled and the deformation of the ODB were measured in the test and compared with the simulation data. The results show that the ODB model with beam elements not only satisfies the demands of the regulations, but also has good local deformation characteristics. The efficiency of computing can be improved obviously with beam elements.

scholarly journals Critical load of steel trusses - graphical methods

2018 ◽  
Vol 219 ◽  
pp. 02015
Author(s):  
Piątkowski Michał
Keyword(s):  
Numerical Analysis ◽  
Critical Load ◽  
Critical Loads ◽  
Experimental Tests ◽  
Experimental Results ◽  
Graphical Methods ◽  
Critical Moment ◽  
Beam Elements ◽  
Steel Truss ◽  
Steel Trusses

The article presents graphical methods for determine critical loads of column and beam elements based on experimental results. The author presents the principles of using each method and the results of author's experimental tests on the instability phenomenon of planar steel truss with imperfections. The discussed methods were used to determine critical load of the tested truss, next compared with the results of numerical analysis. The validity of methods for determining the critical moment in the truss analysis has been confirmed.

05.07: Structural behaviour of simple steel beams subject to axial compression, biaxial bending moments and torsion

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 1076-1085 ◽  
Author(s):  
Adrian Walter ◽  
Julia Herbersagen ◽  
Rebekka Winkler ◽  
Markus Knobloch
Keyword(s):  
Axial Compression ◽  
Steel Beams ◽  
Bending Moments ◽  
Biaxial Bending ◽  
Structural Behaviour

scholarly journals Seismic Collapse Analysis of RC Highway Bridges Based on a Simplified Multiscale FE Modeling Approach

2017 ◽  
Vol 2017 ◽  
pp. 1-19
Author(s):  
Menghan Hu ◽  
Qiang Han ◽  
Xiuli Du ◽  
Xiao Liang
Keyword(s):  
Computational Efficiency ◽  
Highway Bridges ◽  
Multiscale Model ◽  
Fe Modeling ◽  
Simply Supported Beam ◽  
Shell Elements ◽  
Simply Supported ◽  
Beam Elements ◽  
Seismic Collapse ◽  
Beam Bridge

Multiscale finite element (FE) modeling offers a balance between computational efficiency and accuracy in numerical simulations, which is appropriate for analysis of seismic collapse of RC highway bridges. Some parts of structures that need detailed analysis can be modeled by solid elements, while some subordinate parts can be simulated by beam elements or shell elements to increase the computational efficiency. In the present study, rigid surface coupling method was developed to couple beam elements with solid elements using the LS-DYNA software. The effectiveness of this method was verified by performing simulation experiments of both a single-column pier and a two-span simply supported beam bridge. Using simplified multiscale FE modeling, analyses of collapse and local failure of a multispan simply supported beam bridge and a continuous rigid frame bridge were conducted to illustrate the approach in this paper. The results demonstrate that the simplified multiscale model reasonably simulates the collapse process and local damage of complex bridges under seismic loading.

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