CASE STUDIES OF WELDED STEEL STRUCTURE FAILURES

To effectively achieve rapid and high-precision measurements of the deformation of steel welded structure, multiple sets of the actual experimental data of steel welded structure are used as the samples, the soft-sensing model of deformation of welded steel structure, which uses the welding current I, the welding voltage U, the welding speed v and the flow of gas qm as arguments, is established by fuzzy least squares support vector machine, and adaptive genetic algorithm is used to optimize the number of positive gasification rules c and the parameters of kernel function σ, training, testing and practical application results show, the optimization of 200 steps, the training relative error which become saturated is 2.43%, the testing relative error is less than 2.45%.

Download Full-text

Significant Alloy Elements in Welded Steel Structures of Car Body

Archives of Metallurgy and Materials ◽

10.2478/v10172-011-0151-4 ◽

2012 ◽

Vol 57 (1) ◽

pp. 45-52 ◽

Cited By ~ 7

Author(s):

T. Węgrzyn ◽

R. Wieszała

Keyword(s):

Steel Structure ◽

Steel Structures ◽

Filler Materials ◽

Main Role ◽

Welded Steel ◽

Car Body ◽

Welding Method ◽

Welding Steel ◽

Selection Of

Significant Alloy Elements in Welded Steel Structures of Car Body Structure, safety and exploitation conditions of welding steel in car body depend on many factors. The main role of that conditions is connected with car body material, welding technology, state of stress and temperature. Because of that, a good selection of steel and welding method is very important for proper steel structure. Low alloy steel is used for car body structure, very often with small amount of carbon and the amount of alloy elements such as Ni, Mn, Mo, Cr and V in car body and welded joints. Depending on the kind of steel which is used, a proper welding method and adequate filler materials should be applied. The present paper describes the influence of Mn, Ni, Mo, Cr, V in WMD (Weld Metal Deposit) on the behaviour of steel structure especially for low temperature service.

Download Full-text

Impact of steel quick connection system on steel erection labor productivity: case studies and simulation based analyses

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2014-0079 ◽

2014 ◽

Vol 41 (12) ◽

pp. 1036-1045 ◽

Cited By ~ 3

Author(s):

Yongwei Shan ◽

Jung Yeol Kim ◽

Paul M. Goodrum ◽

Carlos H. Caldas ◽

Carl Haas

Keyword(s):

Structural Steel ◽

Case Studies ◽

Steel Structure ◽

Information Modeling ◽

Construction Sites ◽

Construction Productivity ◽

Building Information ◽

Connection System ◽

Steel Connection ◽

The Impact

Traditional steel connection systems rely on on-site welding and bolting, which are labor intensive and require skilled craft workers. Reducing welding and bolting efforts in structural steel erection presents an opportunity to improve steel structure construction productivity. A series of steel quick connection systems (SQCS) have been introduced in the market in the last few years, either through research prototypes or commercial products. However, their real benefits need to be confirmed and quantified at actual construction sites. Hence, the main goal of this study was to evaluate the impact of steel quick connection systems on construction productivity and cost. To accomplish this goal, the authors performed analyses of data from nine SQCS projects and conducted two case studies. The authors also utilized a building information modeling based simulation to compare the schedule impact of SQCS and conventional structural steel connections systems. This paper describes the details of this study and its findings.

Download Full-text

Strength Analysis of a Steel Structure of Weights Boxes by Means of Simulation Computations

LOGI – Scientific Journal on Transport and Logistics ◽

10.1515/logi-2017-0002 ◽

2017 ◽

Vol 8 (1) ◽

pp. 11-19

Author(s):

Miroslav Blatnický ◽

Ján Dižo ◽

Stasys Steišūnas

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Total Mass ◽

Mass Measurement ◽

Steel Structure ◽

Theory Of Elasticity ◽

The Other ◽

Strength Analysis ◽

The Finite Element Method ◽

Welded Steel

Abstract In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

Download Full-text

The Prediction Method of S-N Curve for Welded Steel Structure Using Critical Distance Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.193-194.1436 ◽

2012 ◽

Vol 193-194 ◽

pp. 1436-1439

Author(s):

De Qing Guan ◽

Yan Hui Pan

Keyword(s):

Residual Stress ◽

Fatigue Strength ◽

Numerical Analysis ◽

Engineering Application ◽

Prediction Method ◽

Steel Structure ◽

Critical Distance ◽

Residual Stress Field ◽

Welded Steel ◽

Volume Method

The welded steel structure is used as the research object in this paper. On the basis of numerical analysis of welded steel structure in 3-D residual stress field, the predicted method of the fatigue strength and S-N curve for welded steel structure is set using the volume method of the critical distance theory. The fatigue strength and S-N curve of the typical the welded steel structure including butt, misaligned welded and T-shape joints are got through theory prediction. The predicted value coincides with the experimental value. This method can be reduced fatigue test, saved funds and provided reference for engineering application.

Download Full-text