scholarly journals Crestbond shear connector for load transfer on concrete filled composite columns in fire

2022 ◽  
Vol 15 (3) ◽  
Author(s):  
Luiz Fernando Pereira do Prado ◽  
Larice Gomes Justino Miranda ◽  
Rodrigo Barreto Caldas
Keyword(s):  
Load Transfer ◽  
Steel Plate ◽  
Numerical Study ◽  
Transverse Reinforcement ◽  
Shear Connector ◽  
Column Diameter ◽  
Composite Columns ◽  
In Fire ◽  
Filled Composite ◽  
Transfer Device

ABSTRACT: This paper presents a numerical study of the Crestbond shear connector, characterized by a steel plate with regular cuttings, when used as a load transfer element in concrete filled composite columns in fire. The developed numerical model was calibrated with experimental results of composite columns in fire and later the load transfer devices were inserted. Numerical analyzes were performed with the software Abaqus and comprised the variation of the composite column diameter and of the loading levels, as well as the comparison with the results obtained when is used a through steel plate without cuttings (Shear Flat) as a load transfer device. With the analyzes performed, it was observed that the Crestbond shear connector and the Shear Flat present very similar thermomechanical performance in relation to the load transfer capacity. Thus, the Crestbond shear connector has the potential to be applied alternatively to the Shear Flat as a load transfer device in concrete filled composite columns, with the advantage of the possibility of associate use of longitudinal and manly transverse reinforcement.

scholarly journals Numerical comparison between the thermo-structural behavior of steel and partially encased steel and concrete composite columns in fire

2018 ◽  
Vol 11 (4) ◽  
pp. 876-901
Author(s):  
Y. S. SIMÕES ◽  
F. M. ROCHA ◽  
J. MUNAIAR NETO
Keyword(s):  
Fire Resistance ◽  
Numerical Study ◽  
Load Ratio ◽  
Numerical Comparison ◽  
Geometric Imperfection ◽  
Composite Columns ◽  
Variation Of Parameters ◽  
Surrounding Structure ◽  
Bare Steel ◽  
In Fire

Abstract The bare steel structural members have a low fire resistance. However, in steel and concrete composite members, the concrete encasement, besides the contribution to the stiffness of the whole system, reduces the amount of heat that reaches the steel profile, increasing the its fire resistance. The aim of this paper is to conduct a numerical study on the behavior of steel and steel and concrete composite columns in fire, in order to compare their performance based on the variation of parameters such as the stiffness of the surrounding structure, geometric imperfection and load ratio. It has been found that, in general, the intensity of the geometric imperfection and stiffness of the surrounding structure does not affect the fire resistance of steel and composite columns. However, the stiffness of the surrounding structure raised the maximum value of the restraining forces generate throughout the heating. Regarding the load ratio, when increased, the fire resistance and critical temperature decreased.

scholarly journals Behaviour of corrugated steel plate bridge with high soil cover under seismic excitation

2018 ◽  
Vol 174 ◽  
pp. 04003 ◽  
Author(s):  
Tomasz Maleska ◽  
Damian Beben
Keyword(s):  
Soil Cover ◽  
Steel Plate ◽  
Numerical Study ◽  
Shell Height ◽  
Plate Thickness ◽  
Time History ◽  
Seismic Excitation ◽  
Bridge Span ◽  
Load Carrying ◽  
Static And Dynamic Loads

The design codes and calculation methods related to the corrugated steel plate (CSP) bridges and culverts say only on the minimum soil height. This value is connected with the bridge span and shell height. In the case of static and dynamic loads (like passing the vehicles), such approach seems to be reasonable. However, it is important to know how the CSP bridges with high the soil covers behave under the seismic loads. This paper is presented the result of numerical study of CSP bridge with different high cover under seismic excitation. The analysed CSP railway bridge in the cross section has two closed pipe-arches. The span of shells is 4.40 m and the height of shells is 2.80 m. The load-carrying structure was constructed as two shells assembled from CSP sheets, designed with a depth of 0.05 m, pitch of 0.15 m, and plate thickness of 0.003 m. The real soil cover depth over the CSP structure (including ballast, blanket and backfill) equals 2.40 m. In this study two heights of soil cover were analysed (2.40 m and 5.00 m). Numerical analysis was conducted using the DIANA program based on finite element method (FEM). A linear model with El Centro records and Time History was used to analyse the problem.

scholarly journals Optimized design of concrete-filled steel columns

2022 ◽  
Vol 15 (1) ◽  
Author(s):  
Jéssica Salomão Lourenção ◽  
Paulo Augusto Tonini Arpini ◽  
Gabriel Erlacher ◽  
Élcio Cassimiro Alves
Keyword(s):  
Genetic Algorithm ◽  
Cost Efficiency ◽  
Optimization Problem ◽  
Optimized Design ◽  
Composite Columns ◽  
Steel Columns ◽  
Normal Forces ◽  
Steel Bars ◽  
Genetic Algorithm Method ◽  
Filled Composite

Abstract The objective of this paper is to present the formulation of the optimization problem and its application to the design of concrete-filled composite columns with and without reinforcement steel bars, according to recommendations from NBR 8800:2008, NBR 16239:2013 and EN 1994-1-1:2004. A comparative analysis between the aforementioned standards is performed for various geometries considering cost, efficiency and materials in order to verify which parameters influence the solution of the composite column that satisfies the proposed problems. The solution of the optimization problem is obtained by using the genetic algorithm method featured in MATLAB’s guide toolbox. For the examples analyzed, results show that concretes with compressive strength greater than 50MPa directly influence the solution of the problem regarding cost and resistance to normal forces.

Numerical study on corrosion profile estimation of a corroded steel plate using eddy current

2019 ◽  
Vol 15 (9) ◽  
pp. 1151-1164 ◽  
Author(s):  
Sanjeema Bajracharya ◽  
Eiichi Sasaki ◽  
Hiroshi Tamura
Keyword(s):  
Eddy Current ◽  
Steel Plate ◽  
Numerical Study ◽  
Profile Estimation
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