Fire Resistance Evaluation of Reinforced Concrete Columns Using Axial Load Ratio and Slenderness Ratio

2014 ◽  
Vol 905 ◽  
pp. 268-272
Author(s):  
In Hwan Yeo ◽  
Bum Yean Cho ◽  
Jae Hong An ◽  
Byung Youl Min
Keyword(s):  
Fire Resistance ◽  
Axial Load ◽  
Slenderness Ratio ◽  
Load Ratio ◽  
Cost Effective ◽  
Concrete Columns ◽  
Accurate Estimation ◽  
Structural Members ◽  
Standard Fire ◽  
Resistance Performance

Since the column members in buildings deal with both vertical and horizontal loads, appropriated amount of load should be estimated in order to evaluate the fire resistance performance of the columns under loaded condition. However, according to the ISO 834, the international standard for the evaluation of structural members, the fire resistance performance evaluation of column members is only based on the displacement and displacement rate under loaded condition in a standard fire. The purpose of this study is to suggest appropriate axial load ratios for the evaluation of fire resistance performance. The test conducted in this study produced appropriate axial load ratios for different slenderness ratios. They are expected to contribute to more accurate estimation of fire resistance performance and more efficient and cost-effective structural design.

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.

Study on Estimate of Load Ratio of Doubly Reinforced Concrete Beam Exposed to the Standard Fire

2017 ◽  
Vol 737 ◽  
pp. 465-470
Author(s):  
Jae Hong An ◽  
In Hwan Yeo ◽  
Ki Soo Jeon ◽  
Ki Ho In
Keyword(s):  
South Korea ◽  
Fire Resistance ◽  
Concrete Beam ◽  
Load Ratio ◽  
Reinforced Concrete Beam ◽  
High Rise ◽  
Standard Fire ◽  
Loading Ratio ◽  
Resistance Performance ◽  
Reinforcement Beam

There are a lot of concerns on safety structure performance by being buildings to be large and high-rise. In particular, damage due to the fire recently leads to a large disaster and therefore a variety of countries operate the regulation on the fire resistance performance depending on the building structure. There are differences on the fire resistance design in each country but 50% of the design load is suggested to be reasonable for the normal temperature during the fire by applying the concept of the loading ratio to the fire resistance design of structures. Since the loading ratio is the factor having a major impact on the evaluation of the fire resistance performance, it should be preferentially considered. The study on setting up the loading ratio to evaluate the fire resistance performance and safety of structures has yet to be fully furnished in South Korea. Therefore, in this paper, the loading ratio proper for the construction status in South Korea is to be taken into account and then the ratio is to be proposed on the single reinforcement beam.

Fire Resistance of Reinforced Concrete Columns with Square Cross Section

2007 ◽  
Vol 10 (4) ◽  
pp. 353-369 ◽  
Author(s):  
Bo Wu ◽  
Zhou Hong ◽  
Gui-He Tang ◽  
Chao Wang
Keyword(s):  
Cross Section ◽  
Fire Resistance ◽  
Axial Load ◽  
Load Ratio ◽  
Concrete Columns ◽  
Eccentricity Ratio ◽  
Explosive Spalling ◽  
Strength Concrete ◽  
Axial Load Ratio ◽  
Simulation Results

Calculation of the fire resistance of 480 square cross section normal strength concrete (NSC) columns and 480 high strength concrete (HSC) columns, made with siliceous aggregate, is presented in this paper. The variables considered in the study include concrete strength (NSC and HSC), dimension of column cross section, axial load ratio, load eccentricity ratio (i.e., ratio of load eccentricity to dimension of column cross section), and steel ratio (i.e., ratio of longitudinal reinforcement to cross-sectional area of column). Explosive spalling of HSC exposed to fire is also considered approximately. Simulation results show that: (1) increasing the dimension of column cross section, reducing the axial load ratio, and reducing the load eccentricity ratio are all effective measures for improving the fire resistance of both NSC and HSC columns subjected to concentric axial load or eccentric axial load; (2) increasing the steel ratio has no significant influence on the fire resistance of concentrically loaded NSC and HSC columns, but has some positive effect on the fire resistance of eccentrically loaded NSC and HSC columns; (3) explosive spalling of HSC has a significant detrimental influence on the fire resistance of HSC columns. Based on simulation results, a simplified formula is empirically developed to enable determination of the fire resistance of both NSC and HSC columns, and is shown to be applicable to concrete columns with square cross section.

Fire Resistance Performance of Welded Built-up Square CFT Columns with Reduced Intumescent Paint

2015 ◽  
Vol 6 (2) ◽  
pp. 103-112
Author(s):  
SunHee Kim ◽  
KyongSoo Yom ◽  
SungMo Choi
Keyword(s):  
Stress Concentration ◽  
Fire Resistance ◽  
Axial Load ◽  
Load Ratio ◽  
Functional Design ◽  
Steel Tubes ◽  
Composite Effect ◽  
Axial Load Ratio ◽  
The Law ◽  
Resistance Performance

Welded built-up square CFT columns are widely employed in construction field thanks to their structural efficiencies by avoiding stress concentration area and improving workability in fabrication and maximizing the composite effect enabled by bent ribs. Although welded built-up square CFT columns have structural advantages over other members and are widely used, they are classified as non-fireproof in Korea because the steel tubes are directly exposed to a fire. Thus, fire coating required for the columns by the law results in inefficient design. This study suggests welded built-up square CFT columns with reduced coating to enable improved fire-resistance performance for 2˜3 hours. The purpose of the study is to analyse their fire-resistance performance using the variable of axial Load ratio which is the major factor in the performance and suggest efficient functional design with reduced coating.

Experimental Study on the Influence of Boundary Condition on the Behavioral Characteristics of CFT Square Columns under Constant Axial Load upon a Fire

2011 ◽  
Vol 82 ◽  
pp. 521-526 ◽  
Author(s):  
Heung Youl Kim ◽  
Kyung Hoon Park ◽  
Ki Hyuk Kwon
Keyword(s):  
Boundary Condition ◽  
Cross Section ◽  
Fire Resistance ◽  
Axial Load ◽  
Load Ratio ◽  
Steel Tube ◽  
Section Size ◽  
Cft Column ◽  
Major Factors ◽  
Resistance Performance

The temperature of the steel tube of a CFT column rises rapidly upon a fire causing the deterioration of its strength, while the concrete inside of the tube having large heat capacity provides fire-resistance performance. In order to employ CFT columns as fire-resistant structure, it is necessary to conduct studies on the factors exerting influence on structural capacities and the influence associated with each condition. Concrete’s compressive strength, cross-section size, axial load ratio and boundary condition are the major factors which are influential in fire-resistance performance. In particular, boundary condition between columns and beams is one of the major factors which decide fire-resistance performance because it exerts influence on load carrying capacity. The result of the test conducted in this study showed that fire-resistance time of 106 minutes was secured in the specimens with clamped ends and that of 89 minutes in those with pinned ends when cross-section size was 360mm by 360mm. In the specimens with cross-section size of 280 mm × 280mm, fire-resistance time of 113 minutes was secured under the condition of clamped ends and that of 78 minutes was secured under the condition of pinned ends.

Study on the Data-Bases for Fire Engineering Design of Structural Steels Members

2012 ◽  
Vol 628 ◽  
pp. 156-160
Author(s):  
In Kyu Kwon ◽  
Hyung Jun Kim ◽  
Heung Youl Kim ◽  
Bum Yean Cho ◽  
Kyung Suk Cho
Keyword(s):  
Bearing Capacity ◽  
Fire Resistance ◽  
Engineering Method ◽  
Fire Tests ◽  
Structural Members ◽  
Data Bases ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
In Fire ◽  
Resistance Performance

Structural steel has been used since the early 1970’s in Korea as primary structural members such as columns, beams, and trusses. The materials have much higher strength such as fast construction, high load bearing capacity, high construction quality but those have a fatal weakness as well. Load-bearing capacity is going down when the structural members are contained in fire condition. Therefore, to protect the structural members made of steels from the heat energy the fire resistance performance required. Generally, the fire resistance performance have evaluated from the exact fire tests in fire furnaces. But the evaluation method takes much more time and higher expenses so, the engineering method requires. The engineering method not only adopts a science but also an engineering experience. In this paper, to make various data-bases for evaluation of structural members such as columns(H-section, RHS), beams, loaded fire tests were conducted and derived not only each limiting temperature but also fire resistance respectively.

Drywall Thermal Properties Exposed to High Temperatures and Fire Condition

2013 ◽  
Vol 62 (1) ◽  
Author(s):  
Md Azree Othuman Mydin
Keyword(s):  
Thermal Properties ◽  
High Temperatures ◽  
Fire Resistance ◽  
Residential Buildings ◽  
Cost Effective ◽  
Standard Fire ◽  
Performance Requirements ◽  
Cost Effective Technique ◽  
Fire Barrier ◽  
In Fire

Drywall is a widespread fire barrier used in house and general building construction. Drywall partitions and ceiling membranes are possibly the most common fire resistant construction approach employed in an extensive range of building types. The utilization of drywall board as prime fire protection of light-flame wood or steel construction is ubiquitous. Drywall board based systems are among those now broadly used, as walls or ceilings and it is principally employed as lining material in light-weight construction, which is a competent and cost effective technique of providing flexible partitioning assemblies in commercial and residential buildings. The thickness of the drywall board lining and the configuration of the framing can be flexibly changed to meet specified fire performance requirements. The use of such systems is increasing every day and there demands to be more research on their properties and behaviour. This paper will presents the properties of drywall board which will includes the assemblies and standard fire tests and the thermal properties of drywall in general and includes suggested properties of drywall by different researchers. Drywall boards shrink and crack at high temperatures, and this leads to collapse of parts of the drywall boards in fire. Fall-off of gypsum in fire affects the fire resistance of the assembly considerably, and cannot be overlooked when evaluating the fire resistance of drywall assemblies

Fire resistance performance of steel composite hollow RC column with inner tube under ISO 834 standard fire

2014 ◽  
Vol 15 (4) ◽  
pp. 543-555 ◽  
Author(s):  
Deok Hee Won ◽  
Woo Sun Park ◽  
In-Sung Jang ◽  
Sang-Hun Han ◽  
Taek Hee Han
Keyword(s):  
Fire Resistance ◽  
Rc Column ◽  
Standard Fire ◽  
Steel Composite ◽  
Resistance Performance
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