scholarly journals Fire Resistance Increase of Structural Steel through the Modification of its Chemical Composition

2015 ◽  
Vol 108 ◽  
pp. 277-284 ◽  
Author(s):  
Mariusz Maślak ◽  
Ryszard Skiba
Keyword(s):  
Chemical Composition ◽  
Structural Steel ◽  
Fire Resistance ◽  
Resistance Increase

scholarly journals Replacement of floor structures in capital repair with the use of not extractable void formers

2019 ◽  
Vol 97 ◽  
pp. 06045 ◽  
Author(s):  
Grigoriy Afanasyev
Keyword(s):  
Fire Resistance ◽  
Technology Development ◽  
Residential Buildings ◽  
Capital Repair ◽  
Performance Technology ◽  
Confined Spaces ◽  
Resistance Increase ◽  
The Government ◽  
The Stability

Urgency of the floor structures replacement is driven by the program of capital repair of the residential buildings adopted by the government and stipulates replacement of wood coverings by armored concrete floors that enable increase of stability, fire-resistance and cost effectiveness. Wood partitions and other elements of planning made of materials with low fire-resistance are also subject to replacement. It has been shown that the use of void formers allows reducing consumption of concrete, reinforcement, reduces duration of building and energy consumption. Thereby the stability and fire-resistance increase of the buildings under renovation is achieved. Solving these tasks is the objective of the represented work. It is worth noting that when renovating buildings the data about the use of not extractable void formers are absent. The technology development is an author’s initiative. The goal of the investigations consists in analyzing the works of the domestic and foreign scientists that make it possible to assess effectiveness of the technology when erecting buildings of cast in-situ reinforced concrete with the use of void formers. The submitted work has carried out the adaptation of the works performance technology in confined spaces of capital repair. Optimization of the void formers selection has been made, node points of the slabs’ resting on brick walls have been developed, the technology of dismantlement, form work, reinforcing, installation of void formers and concrete pouring has been developed. The complex of the works provides for obtainment of floor structures with the lesser consumption of concrete and reinforcement..

A Comparison Study of Fire Resistance of High Strength Structural Steels According to Boundary Condition

2014 ◽  
Vol 901 ◽  
pp. 11-14
Author(s):  
In Kyu Kwon
Keyword(s):  
High Temperature ◽  
Structural Steel ◽  
Fire Resistance ◽  
High Strength ◽  
Material Strength ◽  
Mechanical And Thermal Properties ◽  
Comparison Study ◽  
Load Bearing Capacity ◽  
High Rise ◽  
Resistance Performance

Material strength is one of the most important factors in designing a building. For this reason, many structural steel manufacturers have been trying to develop it. In Korea, SM 570 is one high structural steel that has many merits such as longer span and reduction of construction cost for steel works. However, the fire resistance performance of H-section made of SM 570 has not been evaluated. Especially, in high-rise steel building that can be built with various joint systems like hinged to hinge, hinge to fixed, and fixed to fixed. However, the performance of fire resistant is limited. In this paper, to evaluate the fire resistance of H-section made of SM 570, the advanced fire design was conducted using regressive equation of the mechanical and thermal properties at high temperature, compared with those made of an ordinary structural steel, SS 400. The facts show that hinge to hinge had the lowest load bearing capacity at high temperature. Therefore, to keep the same fire resistance with other types boundary conditions, the more passive fire materials are required.

Effect of finishing rolling temperature on fire resistance and dynamic strain aging behavior of a structural steel

2008 ◽  
Vol 43 (17) ◽  
pp. 6005-6011 ◽  
Author(s):  
Welbert Ribeiro Calado ◽  
Odair José dos Santos ◽  
Cynthia Serra Batista Castro ◽  
Ronaldo Neves Barbosa ◽  
Berenice Mendonça Gonzalez
Keyword(s):  
Structural Steel ◽  
Dynamic Strain Aging ◽  
Fire Resistance ◽  
Strain Aging ◽  
Rolling Temperature ◽  
Dynamic Strain ◽  
Aging Behavior

Maintenance repair by welding of badly-corroded railway bridge

2018 ◽  
Author(s):  
Janusz Hołowaty
Keyword(s):  
Chemical Composition ◽  
Mild Steel ◽  
Structural Steel ◽  
Corrosion Damage ◽  
Tensile Tests ◽  
Railway Bridge ◽  
Railway Line ◽  
Steel Members ◽  
Passenger Trains ◽  
Bridge Retrofitting

Remedial repairs were carried out on a railway bridge with severe corrosion damage to its steelwork as part of a project to open the passage of freight trains to a railway line in the Upper Silesia region in southern Poland. The bridge was constructed in 1907, using rimmed mild steel for the riveted plate girder superstructures . While the bridge retrofitting plan was being drawn up, the chemical composition of its structural steel members was assessed, and the ste el'' s weldability was confirmed via tensile tests and carbon equivalents. The existing steelwork was strengthened by restoring section losses in the main girders and end cross beams. The stnuctural integrity of the badly-corroded steelwork was recovered, allowing the return of both freight and passenger trains to the railway line.

Key Program for Non-Equilibrium Phase Diagram of Ni 1 Type Steel

2011 ◽  
Vol 204-210 ◽  
pp. 1357-1361 ◽  
Author(s):  
Qing Hua Zou ◽  
Sheng Zhong Zou
Keyword(s):  
Phase Diagram ◽  
Chemical Composition ◽  
Structural Steel ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Air Cooling ◽  
Lever Rule ◽  
Dynamic Phase ◽  
New Type ◽  
Non Equilibrium

The practical air-cooling new-type dynamic phase diagram and nonequilirium lever rule of Ni 1 structural steel was established, and the relevant structure and chemical composition were analyzed, which can be used in practical production. The computer programs for drawing binary non-equilibrium phase diagram of Ni type structural steel have designed.

An Evaluation of the Fire Performance of H-Section Made of Ordinary Strength Structural Steels by Differences of Length

2014 ◽  
Vol 893 ◽  
pp. 436-439
Author(s):  
In Kyu Kwon
Keyword(s):  
Yield Strength ◽  
Structural Steel ◽  
Structural Stability ◽  
Fire Resistance ◽  
Fire Test ◽  
Structural Steels ◽  
Fire Performance ◽  
Steel Building ◽  
Resistance Performance

Fire resistance performance in steel building is very important for sustaining structural stability during a fire. However, the fire performance has been evaluated by fire test with only one length of the H-section made of an ordinary strength structural steel, such as SS 400 or SM 400. These have the same yield strength, but SM 400 has a better weldability. Therefore, the determination of fire protective materials can be difficult when the H-section made of SS 400 and SM 400 is applied into columns having different lengths are changed. In this paper, an evaluation was conducted to suggest a new guideline for the fire resistance of H-section built with an ordinary strength steels such as SS 400 and SM 400 and having variance of lengths. The results revealed the H-section made of SM 400 showed a little better fire resistance performance. Also, the longer the length of column, the less the fire resistance. Therefore, a new guideline is required to compensate the fire resistance of longer column than that from fire tested.

Study on Fire Resistance of Cement

2013 ◽  
Vol 320 ◽  
pp. 308-313
Author(s):  
Lian Wei Shan ◽  
Jun Li Zhang ◽  
Wei Li ◽  
Zhao Jing Liu ◽  
Ze Wu ◽  
...  
Keyword(s):  
Weight Loss ◽  
Compressive Strength ◽  
Chemical Composition ◽  
Theoretical Analysis ◽  
Internal Structure ◽  
Fire Resistance ◽  
Room Temperature ◽  
Strength Loss ◽  
Hydration Products

This work aims to study the effect of sintering temperatures on the compressive strength and weight of net cement. The compressive strength and quality variety of cement which undergo different sintering temperatures (400°C, 600°C, 800°C, 900°C) and sintered at different times (1h, 2h) are studied through experiments and theoretical analysis. By using XRD explore the inner of sample chemical composition and further obtain the mechanism about sample of weight loss and strength loss. The main internal components of cement are Ca (OH)2, C-S-H, Ca2SiO3 and CaCO3 at room temperature. When the temperature was up to 400°C, The internal structure of cement started to be destroyed due to its hydration products C-S-H, Ca (OH)2 and CaCO3 began to decompose slowly. Keywords: Cement, Fire resistance, Compressive strength

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