A Case Study Of The Use Of Ultrasonic Peening For Upgrading A Welded Steel Structure

2011 ◽  
Vol 55 (9-10) ◽  
pp. 56-67 ◽  
Author(s):  
Stephen J. Maddox ◽  
M. J. Doré ◽  
Simon D. Smith
Keyword(s):  
Steel Structure ◽  
Welded Steel ◽  
Ultrasonic Peening

scholarly journals Assessment of technical condition and repair of steel structure elements on the example of fire damage in a warehouse building

2019 ◽  
Vol 284 ◽  
pp. 02001
Author(s):  
Andrzej Ambroziak ◽  
Paweł Piotrkowski ◽  
Tomasz Heizig
Keyword(s):  
Steel Structure ◽  
External Source ◽  
Technical Condition ◽  
Actual Condition ◽  
Test Results ◽  
Structural Elements ◽  
Site Investigations ◽  
Laboratory Test Results ◽  
Repair Procedure

The paper analyses a case study on the structural assessment of warehouse building partially damaged by fire caused by external source (fire of lorries close to the building). The authors focus on the site investigations and laboratory test results prior to assessing actual condition of the structural elements. Both strengthening concept and repair procedure of a steel column are addressed here. A short literature survey in the paper regards fire damages and its impact on the entire structural systems and its members.

Soft-Sensing Model of Deformation of Welded Steel Structure Based on FLS-SVM and its Application

2014 ◽  
Vol 628 ◽  
pp. 152-156
Author(s):  
Ji Ping Lei ◽  
Jian Mei Chen
Keyword(s):  
Relative Error ◽  
Welding Current ◽  
Steel Structure ◽  
Support Vector ◽  
Adaptive Genetic Algorithm ◽  
Practical Application ◽  
Soft Sensing ◽  
Welded Steel ◽  
Welded Structure ◽  
Sensing Model

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%.

scholarly journals Sustainability Perspective to Support Decision Making in Structural Retrofitting of Buildings: A Case Study

Systems ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 78
Author(s):  
Rui A. F. Oliveira ◽  
Jorge P. Lopes ◽  
Maria Isabel Abreu
Keyword(s):  
Environmental Impact ◽  
Steel Structure ◽  
Embodied Energy ◽  
Case Study Approach ◽  
Study Approach ◽  
Building Retrofit ◽  
Building Market ◽  
Structural Option ◽  
Support Decision Making

The reuse of existing materials in buildings can give a contribution to sustainable practices such as a balance in embodied energy, water, and emission reduction. However, it is not always possible to maintain the existing structural materials because some different technical variables could hamper their usability, namely seismic reinforcement needs, fire safety protection, conservation state, and new legal requirements. The paper follows a case study approach for assessing the technical and environmental performances of structural options for old building retrofitting works. All structural options were analyzed through the results of several categories of environmental impact. Some parameters of a retrofitting management system were also used to frame in a comprehensive way the technical constraints pertaining to building retrofitting works. The structural option choice was taken by the owner with the contribution of the design team and the construction manager of the construction project as well as the results of interviews with other construction professionals, considering the variables related to technical suitability and environmental impact. The results of the study show that the steel structure is the solution that best addresses the technical constraints of the building retrofit works and minimizes environmental impact. The results of the study also suggest that the consideration of other variables other than the technical ones can contribute to the effective functioning of the renovation subsegment of the building market. Some suggestions for further studies to enhance the results of this work are put forward.

A Case Study Aiming to Mitigate Pipe Vibrations Using CFD and Dynamic Stress Analysis Approach

2020 ◽  
Author(s):  
Amar Phatak ◽  
Gaurav Bhende ◽  
Nilesh Mane
Keyword(s):  
Flow Simulation ◽  
Steel Structure ◽  
Design Stage ◽  
Operating Personnel ◽  
Real Risk ◽  
Depth Analysis ◽  
Process Plants ◽  
The Times ◽  
Engineering Practices

Abstract Piping vibrations in process plants are rarely analyzed or anticipated correctly during the ‘design Stage’. Most of the times ‘in -depth’ analysis is not carried out during ‘design stage’ except following few good engineering practices. As a result, few pipes can show excessive vibrations during operations that fall under the ‘danger’ zone. The vibrating pipe transfers the vibrations to the steel structure and these vibrations are experienced by operating personnel causing a ‘safety hazard’. The real risk is loss of containment due to unacceptable vibrations and eventual fatigue failure of pipe and or structure. The reason resulting in vibrations can be connection of pipe with rotating equipment, the vibration of structure on which the pipe is supported, flow inside the pipe, noise level or slug / water hammer. Here, the authors present a case study of a vibrating pipe beyond the accepted limit and how the pipe vibrations which are being transferred to supporting platform are minimized. The analytical results obtained by software simulations are benchmarked against actual readings measured at the site. The paper also provides the mathematics and its application to solve a practical vibration problem. It provides a systematic approach starting from generic calculations until a detailed flow simulation. In the end, it provides guidelines to select rubber and viscous dampers. The innovative part of the case study is the usage of specially designed rubber mounds which have yet not been used for pipe vibrations.

Significant Alloy Elements in Welded Steel Structures of Car Body

2012 ◽  
Vol 57 (1) ◽  
pp. 45-52 ◽  
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.

scholarly journals Aeroelastic Response of Suspended Pedestrian Bridges Made of Laminated Wood and Hemp

2020 ◽  
Vol 5 (7) ◽  
pp. 60
Author(s):  
Fabio Rizzo
Keyword(s):  
Steel Structure ◽  
Wind Tunnel Experiments ◽  
Aeroelastic Response ◽  
Flutter Speed ◽  
Pedestrian Bridges ◽  
Torsional Frequency ◽  
Structural Configurations ◽  
Steel Cables ◽  
Two Degree Of Freedom

The work described in this paper investigated, by calculating critical flutter speed, the aeroelastic response of suspended pedestrian bridges made of a laminated wood structure and hemp cables and compared them to bridges with a steel structure and harmonic steel cables. Critical flutter speed was estimated using a numerical two degree of freedom (2-DOF) generalized deck model based on finite-element modal analysis. The critical flutter speeds of two sets of 25 different structural configurations, obtained by varying the deck chord and the permanent deck loads, made of steel and of laminated wood respectively, were estimated using experimental flutter derivatives obtained from 30 wind tunnel experiments. One of the most significant results was that pedestrian bridges made of laminated wood and hemp have a higher torsional frequency than those made of steel and that this affects critical flutter speed. A case study was performed and discussed by analyzing the structural and aeroelastic response of a 250 m pedestrian bridge with a 12 m deck chord and two approximately 32 m tall towers.

Sign in / Sign up

Export Citation Format

Share Document