Analysis of Structural Stability for H-Section Made of SM 400 According to Lengths and Boundary Conditions at High Temperatures

2014 ◽  
Vol 543-547 ◽  
pp. 3857-3860
Author(s):  
In Kyu Kwon
Keyword(s):  
Boundary Condition ◽  
Thermal Properties ◽  
Boundary Conditions ◽  
Fire Resistance ◽  
Mechanical And Thermal Properties ◽  
Structural Elements ◽  
Limited Size ◽  
Testing Facility ◽  
Main Factors ◽  
Proper Theory

A fire can cause serious damage to steel framed buildings so most of countries have fire regulations specifying fire resistance for structural elements. Fire resistance generally has been evaluated by a limited size testing facility. However, the size of columns and beams are different based on various conditions. Especially, the height of column and boundary condition are the main factors that govern the fire resistance of structural elements. To make a basic database for the H-section made of an ordinary grade structural steel, SM 400, an analysis was conducted by using mechanical and thermal properties with a proper theory. The fact findings suggested that the fire resistance for longer and fixed to fixed column were required a new guide line for covering of fire protective materials.

Thermal Analysis of Reinforced Concrete Structural Elements

2013 ◽  
Vol 4 (4) ◽  
pp. 227-244 ◽  
Author(s):  
Hitesh Lakhani ◽  
Praveen Kamath ◽  
Pradeep Bhargava ◽  
Umesh Sharma ◽  
G Reddy
Keyword(s):  
Thermal Analysis ◽  
Boundary Condition ◽  
Thermal Properties ◽  
Reinforced Concrete ◽  
Boundary Conditions ◽  
Experimental Result ◽  
Structural Elements ◽  
Radiation Boundary Condition ◽  
Element Analysis ◽  
Significant Difference

The paper presents a comparative study of thermal properties of reinforced concrete structural elements. A total of 2 beams and 2 columns were selected from literature [1-3]. Thermal profiles of these elements were predicted using different thermal properties and were compared with the experimental results. The thermal analysis is carried out numerically using finite element analysis package, ABAQUS [4]. Comparisons of different analyses results have been made with the main focus laid on the effect of the boundary conditions i.e. prescribed temperature boundary condition, convection and radiation. During the heating phase, there was slight difference in the temperatures predicted using the two boundary conditions, whereas during cooling phase, there was a significant difference: the convective and radiation boundary condition yielded better results. A reduction in discrepancy between the simulated and experimental result was observed on using thermal properties as per the formulation in Eurocode2 which took into account the moisture content.

Conduction of heat in a solid with periodic boundary conditions, with an application to the surface temperature of the moon

1953 ◽  
Vol 49 (2) ◽  
pp. 355-359 ◽  
Author(s):  
J. C. Jaeger
Keyword(s):  
Boundary Condition ◽  
Thermal Properties ◽  
Circular Cylinder ◽  
Boundary Conditions ◽  
Surface Temperature ◽  
Numerical Method ◽  
Periodic Boundary ◽  
Periodic Boundary Conditions ◽  
The Moon ◽  
Non Linear

The object of this note is to indicate a numerical method for finding periodic solutions of a number of important problems in conduction of heat in which the boundary conditions are periodic in the time and may be linear or non-linear. One example is that of a circular cylinder which is heated by friction along the generators through a rotating arc of its circumference, the remainder of the surface being kept at constant temperature; here the boundary conditions are linear but mixed. Another example, which will be discussed in detail below, is that of the variation of the surface temperature of the moon during a lunation; in this case the boundary condition is non-linear. In all cases the thermal properties of the solid will be assumed to be independent of temperature. Only the semi-infinite solid will be considered here, though the method applies equally well to other cases.

scholarly journals APPLICATION OF EARTH AND STRAW MIXTURES IN MODERN BUILDING

2016 ◽  
Vol 1 (15) ◽  
Author(s):  
Ivan Hegediš ◽  
Neđo Đurić ◽  
Arpad Čeh ◽  
Golub Karaman ◽  
Danilo Vunjak ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Energy Consumption ◽  
Architectural Design ◽  
Mechanical And Thermal Properties ◽  
Structural Elements ◽  
Wooden Frame ◽  
Energy Consumption Reduction ◽  
Consumption Reduction ◽  
Modern Building

Building with earth is widespread and still mostly based on traditional experiences. Increasing demandsin energy consumption reduction during the construction and exploitation of buildings put more andmore in the focus the good features of houses built with earth.Testing of earth mixtures with othernatural materials showed that it can get even a quality of bricks, which indicates the lack of appropriatestandards for this type of construction.Testing are performed with mixes of earth and straw intended forrammed earth and adobe construction.This method of preparation and construction applies in alternate construction with straw bales and it isalso used in the construction of prefabricated panels with wooden frame filled with a mixture earth andstraw where it is possible to build prefabricated structures or as a filling of wall screens in skeletalstructural system of larger dimensions and number of floors.Laboratory tests have shown that the mechanical and thermal properties of this material fulfilled thehigh demands for the construction of modern buildings. Based on the presented results it can proceedthe development and testing of structural elements for that kind of building.Also, based on results, in the article the authors presented possibilities of architectural design ofvarious building possibilities of objects, as practical examples of prefabrication applied in somecountries.

Comparison Study of Structural Stabilities for H-Section Columns Built with Ordinary Grade Strength Structural Steels According to Boundary Conditions and Lengths at High Temperature

2014 ◽  
Vol 937 ◽  
pp. 424-427
Author(s):  
In Kyu Kwon
Keyword(s):  
Boundary Condition ◽  
High Temperature ◽  
Boundary Conditions ◽  
Fire Resistance ◽  
Structural Steels ◽  
Structural Members ◽  
Steel Buildings ◽  
Standard Fire ◽  
Fire Curve ◽  
Resistance Performance

Fire resistance performance of structural members has been evaluated from each singular section and standard fire curve since the beginning of fire tests. However, the need of the exact fire resistance of H-section columns applied in the steel buildings has increased. The main reason for this is there is a difference between the conditions being conducted during the fire test and that from real situation. In this paper, the structural stability of H-section column made of an ordinary strength grade structural steels, SS 400, SM 400, and SM 490 at high temperature were evaluated and compared with boundary conditions and column’s length. This was done in order to suggest a new guideline for the application of fire protective materials in steel column in which the boundary conditions and column lengths are different from that tested with hinge to hinge and 3500 mm. The findings from this study showed hinge to hinge boundary condition was more conservative. And fire resistance performance of longer columns in the case of hinge to fixed and fixed to fixed boundary condition than from 3500 mm and hinge to hinge boundary condition can sustain at high temperature without adding fire protective materials.

A Study of Fire Resistance According to Boundary Condition of Ordinary Grade Structural Steels

2014 ◽  
Vol 510 ◽  
pp. 97-100
Author(s):  
In Kyu Kwon
Keyword(s):  
Boundary Condition ◽  
High Temperature ◽  
Fire Resistance ◽  
Structural Steels ◽  
Mechanical And Thermal Properties ◽  
Allowable Stress ◽  
Standard Fire ◽  
Fire Engineering ◽  
The Difference ◽  
Fire Curve

Building construction has been developed with an increase of steel application at main members, but the weakness should be resolved with a proper fire resistance. The fire engineering method is regarded as an alternative way to evaluate the fire resistance with mechanical and thermal properties at high temperature. In this paper, the fire resistance of H-section built with ordinary grade structural steels such as SS 400 and SM 490 those are representative structural steels at the construction market were analyzed by the difference of boundary conditions. The study showed that the H-section made of SM 490 represented little difference in reduction ratio of an allowable stress at one hour standard fire curve. And the hinge to hinge boundary condition from both H-sections was the lowest. As the grade of structural steel rises, the difference in an allowable stress at high temperature according to grade of structural steels is inclined to increase.

A Comparative Study on the Fire Resistance of Ordinary Grade Structural Steels

2014 ◽  
Vol 904 ◽  
pp. 228-231
Author(s):  
In Kyu Kwon
Keyword(s):  
Heat Transfer ◽  
Fire Resistance ◽  
Fire Test ◽  
Structural Steels ◽  
Mechanical And Thermal Properties ◽  
Structural Elements ◽  
Heat Transfer Theory ◽  
Eurocode 3 ◽  
The Cost ◽  
Fire Design

Fire resistance of structural elements such as columns and beams has been evaluated by the fire test. However, needs of fire design based on analysis using a heat transfer theory and a stress analysis are increasing because the design can reduce not only the period of the fire test but the cost of it. The reliability of the analysis would be totally dependent on the mechanical, thermal databases of their structural steels. This paper evaluates the fire resistance of ordinary grade structural steels manufactured from Korea by examining the mechanical and thermal properties of SS 400, SM 400, and SM 490 at high temperature and comparing them with those defined in Eurocode 3. The results showed that the ordinary structural steel had almost the same characteristics as those in Eurocode 3.

Analytic Study of Structural Stability at High Temperature of Structural Beam Made of SM 400

2014 ◽  
Vol 977 ◽  
pp. 378-381
Author(s):  
In Kyu Kwon
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Thermal Stress ◽  
High Temperature ◽  
Structural Stability ◽  
Fire Resistance ◽  
Analytic Study ◽  
Structural Elements ◽  
Building Fire ◽  
Resistance Performance

A fire occurred in the steel framed building could be yielded an unexpected disasters including loss of human lives and damages of properties. Therefore, to evade the tragedies from the building, fire resistance performance of structural elements is required and specified into each nation’s building regulation. Especially, the structural beam plays a key role to transfer the load applied on the floor to column. In this study, to estimate the fire resistance performance of structural beam made of SM 400, analysis using not only mechanical, thermal properties at high temperature of the SM 400 but theories of heat transfer and thermal stress were conducted. The result of this study showed that as the lengths of beam are increased, the structural stability become getting worse. Therefore, it is not recommended to use the same thickness of fire protective materials derived from prototype’s length, 4100 mm to longer beam.

A Study of the Fire Resistance against Structural Materials of H-Section Made of SS 400 by Boundary Conditions at High Temperature

2014 ◽  
Vol 886 ◽  
pp. 51-54
Author(s):  
In Kyu Kwon
Keyword(s):  
Boundary Condition ◽  
High Temperature ◽  
Boundary Conditions ◽  
Stress Analysis ◽  
Structural Steel ◽  
Fire Resistance ◽  
Engineering Method ◽  
Allowable Stress ◽  
Materials Properties ◽  
Fire Engineering

Fire resistance of H-section by types of boundary condition such as hinge to hinge, hinge to fixed, and fixed to fixed at high temperature can be different. However, the study of evaluation is very limited. In this study, to estimate the fire resistance of H-section made of ordinary structural steel, SS 400, a fire engineering method was used with applying materials properties at high temperature and a heat analysis, a stress analysis. The results showed that hinge to hinge boundary condition was the lowest at an allowable stress at high temperature. Therefore, the application of the hinge to hinge is more conservative boundary condition in H-section connection in high temperature.

scholarly journals Modifying composition of plastering mortar for the purpose of enhancing fire resistance of building structures by means of silicate additives

2019 ◽  
Vol 97 ◽  
pp. 03014
Author(s):  
Nikita Levashov ◽  
Marina Akulova ◽  
Yulia Sokolova
Keyword(s):  
Thermal Properties ◽  
Fire Resistance ◽  
Water Glass ◽  
Setting Time ◽  
The Other ◽  
Mechanical And Thermal Properties ◽  
Building Structures ◽  
Mixing Ratio ◽  
Optimum Choice ◽  
Cement Binder

The present paper deals with modifying composition of plastering mortar for the purpose of enhancing fire resistance of building structures by means of silicate additives. Interaction of soluble water glass with cement binder elongates the initiation of setting time and reduces the time of final setting that could be explained by the opposed action of each component. One of the components facilitates the increase in the mobility of the mortar while the other, as opposed, is fastening rapidly. The optimum choice of the mixing ratio in the mortar would enhance both physical-mechanical and thermal properties.

A Study on Comparison of Mechanical, Thermal Properties of High Strength Structural Steels at High Temperature

2014 ◽  
Vol 902 ◽  
pp. 3-6
Author(s):  
In Kyu Kwon
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Fire Resistance ◽  
High Strength ◽  
Structural Steels ◽  
Mechanical And Thermal Properties ◽  
Protective Material ◽  
Eurocode 3 ◽  
Resistance Performance

As the strength of structural steels is increasing, the performance of fire resistance should be evaluated clearly and suggested. While their application has been expanded, the evaluation of the fire resistance is inclined to adopt that derived from ordinary strength steels. In order to compare the fire resistance performance of high strength structural steels at high temperature, databases such as mechanical and thermal properties at elevated temperature were compared with those of Eurocode 3. After comparison, it is recommended that the passive protective material is more needed than those for the ordinary strength structural steels to meet the fire resistance requirement.

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