Effectiveness of Polypropylene and Steel Fibers in Enhancing Fire Resistance of High-Strength Concrete Columns

2018 ◽  
Vol 144 (3) ◽  
pp. 04017224 ◽  
Author(s):  
Wasim Khaliq ◽  
Venkatesh Kodur
Keyword(s):  
Fire Resistance ◽  
High Strength Concrete ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Fibers ◽  
Strength Concrete ◽  
High Strength Concrete Columns

Fire Resistance Performance of High-Strength Concrete Columns Reinforced with Pre-Stressed Wire Ropes

2013 ◽  
Vol 470 ◽  
pp. 880-883 ◽  
Author(s):  
Heung Youl Kim ◽  
Hyung Jun Kim ◽  
Kyung Hoon Park ◽  
Bum Youn Cho ◽  
Jae Sung Lee
Keyword(s):  
Fire Resistance ◽  
High Strength Concrete ◽  
High Strength ◽  
Concrete Columns ◽  
Concrete Column ◽  
Wire Ropes ◽  
Strength Concrete ◽  
Design Load ◽  
Resistance Performance ◽  
High Strength Concrete Columns

In this study, the fire resistance performance of high-strength concrete columns was evaluated to see the influence of lateral confinement reinforcement with wire ropes for improving ductility, fire resistance reinforcement with fiber cocktail and load ratio. For this, loaded fire test was conducted under ISO834 standard fire condition. The axial ductility of the 60MPa high-strength concrete column reinforced with pre-stressed wire ropes was improved and its fire resistance performance was also improved by 23% compared with its counterpart without wire ropes. The appropriate load for the 60MPa concrete column reinforced with wire ropes was found to be 70% of design load. The fire resistance performance of the 100MPa high-strength concrete column reinforced with pre-stressed wire ropes and fiber-cocktail was improved as much as 4 times compared with that reinforced with tie bars only. The appropriate load for the 100MPa columns was found to be less than 70% of design load in order for the columns to secure required fire resistance performance.

Reliability Analysis of High-Strength Concrete Columns during a Fire

2014 ◽  
Vol 629-630 ◽  
pp. 273-278 ◽  
Author(s):  
Jian Zhuang Xiao ◽  
Qing Hai Xie ◽  
Yi Zhao Hou ◽  
Zhi Wei Li
Keyword(s):  
Reliability Analysis ◽  
Fire Resistance ◽  
High Strength Concrete ◽  
Elevated Temperatures ◽  
Axial Loading ◽  
High Strength ◽  
Concrete Columns ◽  
Explosive Spalling ◽  
Strength Concrete ◽  
High Strength Concrete Columns

A reliability analysis was conducted on high-strength concrete (HSC) columns during a fire. The influences of fire’s randomness and explosive spalling of concrete were investigated. The fire resistance for axial loading capacity of HSC columns was in terms of steel yield strength and concrete compressive strength with considering the effect of elevated temperatures. The load random variables included dead load and sustained live load. The JC method was applied to calculate the reliability index of the fire resistance of axially loaded HSC columns. It was found that the randomness of fire and explosive spalling of concrete had a significant influence on reliability of HSC columns.

scholarly journals PERFORMANCE OF HIGH STRENGTH CONCRETE COLUMNS REINFORCED WITH HYBRID STEEL FIBER UNDER DIFFERENT LOADING CONDITIONS

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Emdad K.Z. Balanji ◽  
M. Neaz Sheikh ◽  
Muhammad N.S. Hadi
Keyword(s):  
High Strength Concrete ◽  
Steel Fiber ◽  
Reference Group ◽  
High Strength ◽  
Concrete Columns ◽  
Steel Fibers ◽  
Loading Conditions ◽  
Strength Concrete ◽  
High Strength Concrete Columns ◽  
Strength And Ductility

The strength and ductility of high strength concrete columns improve with the addition of steel fiber. This paper reports the behavior of circular High Strength Concrete (HSC) columns reinforced with Hybrid Steel Fibers (HSF) under different loading conditions. In this study, HSF consisted of a combination of macro steel fibers and micro steel fibers. A total of eight circular specimens of 205 mm diameter and 800 mm height were cast and tested. All specimens were reinforced with same amount of steel reinforcements. The specimens were divided into two groups of four specimens. Group RC (reference group) contained no steel fibers. Group HSF (hybrid steel fibers) contained 2.5% by volume of HSF. From each group one specimen was tested under concentric loading, one under 25 mm eccentric loading, one under 50 mm eccentric loading, and one under four-point loading. The results showed that the specimens reinforced with HSF achieved higher strength and ductility compared to RC specimens under different loading conditions. It was also observed that the presence of HSF delayed the spalling of the concrete cover.

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