scholarly journals Research of strength capabilities of building steels under temperature effects

2021 ◽  
Vol 2131 (2) ◽  
pp. 022019
Author(s):  
N L Vernezi ◽  
E E Kosenko ◽  
V V Kosenko ◽  
D B Demchenko ◽  
A V Cherpakov
Keyword(s):  
Low Temperatures ◽  
Temperature Effects ◽  
Information Technologies ◽  
High Strength Steels ◽  
High Strength ◽  
Building Structures ◽  
Load Bearing ◽  
Russian Industry ◽  
The World

Abstract The use of information technologies in construction makes it possible to assess the strength capabilities of various classes of reinforcement in order to use the full strength potential of steels laid down at the production stage. The information obtained during the study of the properties of steels is important both for building structures and for metals used in the manufacture of load-bearing car bodies, in the construction of which high-strength steels are also used. In terms of the quality of the steels produced, the Russian industry is among the leaders in the world along with the largest European companies. The high characteristics of steel make it possible to expand the range of their application, both in conditions of elevated and in conditions of low temperatures.

scholarly journals Use of Fine-Grained Heat-Strengthened Steels to Increase the Operation Qualities of Bunker Capacities from Thin-Walled Galvanized Profiles

2021 ◽  
pp. 84-93
Author(s):  
Y. I. Hezentsvei ◽  
D. O. Bannikov
Keyword(s):  
Low Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Numerical Calculations ◽  
Structural Scheme ◽  
Plan View ◽  
Fine Grained ◽  
Steel Sheets ◽  
Stiffening Ribs ◽  
Corrugated Sheets

Purpose. The work is aimed to study the use efficiency of fine-grained heat-strengthened steels (mainly 10G2FB) for steel bunker capacities. At the same time, the structural scheme of such a structure using corrugated steel sheets is considered as the main variant. Methodology. To achieve this purpose, a series of numerical calculations was carried out for a steel bunker capacity of a pyramidal-prismatic type with overall dimensions in plan view of 6×5.2 m and a total height of 4.5 m. The capacity was designed for complicated working conditions, in particular, increased loads, including long-term dynamic ones. The potential possibility of operating the container under conditions of high or low temperatures was also taken into account. At the same time, both the traditional structural scheme of a bunker capacity with horizontal stiffening ribs and the developed structural scheme based on corrugated steel sheets were analyzed. The calculations were carried out by the finite element method based on the SCAD for Windows project complex. Findings. Based on the results of the analysis and comparison of the data obtained in numerical calculations, it was found that the use of fine-grained heat-strengthened high-strength steels (for example, steel 10G2FB) for bunker capacities, both the traditional structural scheme with stiffening ribs and the developed structural scheme based on corrugated sheets, allows reducing material consumption by about 30% in both cases. At the same time, due to the good performance of fine-grained heat-strengthened steel 10G2FB, both at high and at low temperatures, it can be effectively used for steel bunker capacities that work in difficult conditions. Originality. The possibility and efficiency of the use of fine-grained, heat-strengthened high-strength steels for the construction of a steel bunker capacity is estimated. At the same time, such an estimation was given not only for structures of the traditional structural scheme with horizontal stiffening ribs, but also for bunkers with a developed structural scheme based on corrugated sheets. Practical value. From a practical point of view, quantitative parameters of the stress-strain state were obtained during investigations of various design variants for a steel bunker capacity. The data are presented in a compact form that is easy to evaluate and compare. They allow us to state about the improvement of the operation characteristics of capacities and the potential reduction of the risks of their failures and accidents during operation.

Government and Inter-Organizational Collaboration as Strategies for Administrative Reform in Mexico

2013 ◽  
pp. 79-101
Author(s):  
Luis F. Luna-Reyes ◽  
J. Ramon Gil-Garcia
Keyword(s):  
Citizen Participation ◽  
Information Technologies ◽  
Administrative Reform ◽  
Electronic Government ◽  
Public Servants ◽  
Sector Reform ◽  
Reform Strategy ◽  
The World ◽  
Mexican Government

The use of Information Technologies in government as a strategy for public sector reform has increased in the last few years. Governments around the world are attempting to obtain the benefits of what is now called “electronic government.” However, Information Technologies are only one component of what should be a much more complex reform strategy involving changes in organizational characteristics, institutional arrangements, and contextual factors. Based on a survey of public servants from the federal Mexican government and using institutional theory as the analytical lense, this chapter presents descriptive results about the characteristics, objectives, results, and success of inter-organizational electronic government initiatives. Overall, the projects were considered successful, and some of these aspects could be considered important for administrative reform efforts. The areas identified with the greatest success were (1) improvement in the quality of service, (2) creation of a more transparent government, and (3) creation of the necessary infrastructure for the use of Information Technologies. In contrast, the areas with room for improvement were (1) fostering citizen participation, (2) cost reduction, and (3) increased agency productivity.

scholarly journals RESIDUAL STRENGTH OF STRUCTURAL STEELS: SN400, SM520 AND SM570

2016 ◽  
Author(s):  
In-Rak Choi ◽  
Kyung-Soo Chung
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperatures ◽  
High Strength Steels ◽  
High Strength ◽  
Building Construction ◽  
Steel Plates ◽  
Seismic Resistance ◽  
Building Structures ◽  
Reliable Performance ◽  
Strength And Stiffness

<p>This paper presents post-fire mechanical properties of mild to high-strength steels commonly used in building structures in Korea. Steel is one of the main materials for building construction due to fast construction, light weight, and high seismic resistance. However, steel usually loses its strength and stiffness at elevated temperatures, especially over 600°C. But steel can regain some of its original mechanical properties after cooling down from the fire. Therefore, it is important to accurately evaluate the reliable performance of steel to reuse or repair the structures. For this reason, an experimental study was performed to examine the post-fire mechanical properties of steel plates SN400, SM520 and SM570 after cooling down from elevated temperatures up to 900°C. The post-fire stress-strain curves, elastic modulus, yield and ultimate strengths and residual factors were obtained and discussed.</p>

Forming of Automotive Parts with Nuts Clinch Process in Comparison to Welding of Nuts

2014 ◽  
Vol 611-612 ◽  
pp. 1503-1510
Author(s):  
Pawel Balon ◽  
Andrzej Świątoniowski
Keyword(s):  
Mass Production ◽  
High Strength Steels ◽  
Dynamic Strength ◽  
High Strength ◽  
Plastic Properties ◽  
Joining By Forming ◽  
Automotive Parts ◽  
Set Up ◽  
Increased Strength

In this paper authors present joining by forming method for screws and nuts. Self-clinching nut process was compared to a traditional nut welding method after drawing the requested shape in order to analyse quality of junction. That process is very often carried out for High Strength Steels which usually contain decreased plastic properties and increased strength. It usually causes a problem to set up the self-clinching process. Currently, there are a few companies specialising only in this kind of processes, however correct designing of such tool requires taking into account many factors such as choose of joining method by forming and proper connector type. Despite many difficulties, this method allows for joining hard welded steels and most of all for minimization of operations amount in mass production. Operations of joining by forming of nuts and screws, gives significant savings of anticipated costs with simultaneously guarantees high static and dynamic strength.

Effect of Electrode Force Change on Spot Weld Quality of AHSS Using Servo Gun

2011 ◽  
Vol 189-193 ◽  
pp. 3359-3363 ◽  
Author(s):  
Cai Ping Liang ◽  
Xiao Hang Liu ◽  
Yue Wei Bai
Keyword(s):  
Spot Welding ◽  
High Strength Steels ◽  
Welding Current ◽  
High Strength ◽  
Weld Quality ◽  
Tensile Shear ◽  
Force Curve ◽  
Electrode Force ◽  
Different Thickness

Due to bad welds including small button, weld expulsion, and weld whisker etc., it is studied that the effect of constant and variable electrode force with servo gun on the weld quality of high strength steels with different thickness and materials. The results show that the electrode force plays an important role in resistance spot welding of AHSS as well as that of mild steels. Under the same welding current and time, better welds with higher tensile shear strength and larger nugget size can be obtained by optimizing electrode force curve using servo gun. The solutions could supply reference to study the prospect of servo gun in the joining of high strength steels.

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