Fire resistance of composite columns with embedded I-section steel — Effects of section size and load level

2008 ◽  
Vol 64 (3) ◽  
pp. 312-325 ◽  
Author(s):  
Zhan-Fei Huang ◽  
Kang-Hai Tan ◽  
Wee-Siang Toh ◽  
Guan-Hwee Phng
Keyword(s):  
Fire Resistance ◽  
Load Level ◽  
Composite Columns ◽  
Section Size

scholarly journals Experimental and Analytical Study on Creep Characteristics of Box Section Bamboo-Steel Composite Columns under Long-Term Loading

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 983
Author(s):  
Shixu Wu ◽  
Keting Tong ◽  
Jianmin Wang ◽  
Yushun Li
Keyword(s):  
Load Level ◽  
Experimental Results ◽  
Creep Model ◽  
Composite Column ◽  
Composite Columns ◽  
Creep Coefficient ◽  
Creep Characteristics ◽  
Section Size ◽  
Steel Composite

To expand the application of bamboo as a building material, a new type of box section composite column that combined bamboo and steel was considered in this paper. The creep characteristics of eight bamboo-steel composite columns with different parameters were tested to evaluate the effects of load level, section size and interface type under long-term loading. Then, the deformation development of the composite column under long-term loading was observed and analyzed. In addition, the creep-time relationship curve and the creep coefficient were created. Furthermore, the creep model of the composite column was proposed based on the relationship between the creep of the composite column and the creep of bamboo, and the calculated value of creep was compared with the experimental value. The experimental results showed that the creep development of the composite column was fast at first, and then became stable after about 90 days. The creep characteristics were mainly affected by long-term load level and section size. The creep coefficient was between 0.160 and 0.190. Moreover, the creep model proposed in this paper was applicable to predict the creep development of bamboo-steel composite columns. The calculation results were in good agreement with the experimental results.

Axial restraint effects on the fire resistance of composite columns encasing I-section steel

2007 ◽  
Vol 63 (4) ◽  
pp. 437-447 ◽  
Author(s):  
Zhan-Fei Huang ◽  
Kang-Hai Tan ◽  
Guan-Hwee Phng
Keyword(s):  
Fire Resistance ◽  
Composite Columns

scholarly journals Finite Element Modelling of the Fire Resistance of Double Skin Composite Walls Subjected to Monotonic Compressive Loading

2021 ◽  
Author(s):  
Mohamed Yanis Bournas
Keyword(s):  
Finite Element ◽  
Fire Resistance ◽  
High Performance Concrete ◽  
Compressive Load ◽  
Load Level ◽  
Concrete Core ◽  
Steel Sheets ◽  
Double Skin ◽  
Composite Wall ◽  
Composite Walls

The fire resistance of double skin composite wall (DSCW) system composed of two profiled steel sheets and concrete infill is investigated through use of finite element (FE) methods. The fire resistance of DSCW when exposed to elevated temperature and a constant axial compressive load with different infill materials such as self-consolidating concrete (SCC), engineered cementitious concrete (ECC) and ultra-high performance concrete (UHPC) is investigated. The influence of parameters such as load level, thickness of steel sheets, depth of concrete core and fastener arrangement on the fire resistance of the DSCW are established. The performance of SCC-based DSCW has the best fire resistance followed by ECC and UHPC-based composite walls. The increase in load level decreases the fire resistance while the increase in depth of concrete infill increases the fire resistance of the composite wall. The fastener arrangement and steel thickness have no significant influence on the resulting fire resistance.

scholarly journals EXPERIMENTAL STUDY ON BEHAVIOR OF UNPROTECTED FOAMED CONCRETE FILLED STEEL HOLLOW COLUMN UNDER FIRE

2021 ◽  
Vol 12 (2) ◽  
pp. 189-202
Author(s):  
Bishir Kado ◽  
Shahrin Mohammad ◽  
Yeong Huei Lee ◽  
Poi Ngian Shek ◽  
Mariyana Aida Ab Kadir
Keyword(s):  
Fire Resistance ◽  
Applied Load ◽  
Fire Test ◽  
Lightweight Concrete ◽  
Steel Tube ◽  
Load Level ◽  
Exposure Test ◽  
Hollow Section ◽  
High Rise ◽  
Foamed Concrete

Reduction in self-weight and achievement of full fire resistance requirements are some of the important considerations in the design of high-rise structures. Lightweight concrete filled steel tube (CFST) column provides an alternative method to serve these purposes. Recent studies on lightweight CFST columns at ambient temperature have revealed that foamed concrete can be a beneficial and innovative alternative material. Hence, this study investigates the potential of using foamed concrete in circular hollow steel columns for improving fire resistance. A series of nine fire test on circular unfilled hollow and foamed concrete filled hollow section column were carried out. ISO 834 standard fire exposure test were carried out to investigate the structural response of these columns under fire. The main parameters considered are load level and foamed concrete density; foamed concrete density used are 1500 kg/m3 and 1800 kg/m3 at 15%, 20%, and 25% load level. All the columns tested are without any external fire protection, with concentrically applied load under fixed-fixed boundary conditions. The columns dimension was 2400 mm long, 139.7 mm diameter and steel tube thickness of 6 mm. The fire test result showed that foamed concrete increases the fire resistance of steel hollow column up to an additional 16 minutes. The improvement is more at load level above 15%, and the gain in fire resistance is about 71% when 1500 kg/m3 density foamed concrete is used. Generally, foamed concrete filled steel hollow column demonstrate a good structural fire behavior, based on the applied load and foamed concrete density. Also, inward local buckling was averted by filling the steel hollow column with foamed concrete. General method for composite column design in Eurocode 4 adopted to calculate the axial buckling load of 1500 kg/m3 foamed concrete filled columns.  These type of columns can be used for structures like airports, schools, and stadiums; taking the advantage of exposed steel for aesthetic purpose and high fire resistance. It can also be used for high rise structures; taking advantage of high fire resistance and reduction in self-weight of a structure.

Performance of prestressed concrete box bridge girders under hydrocarbon fire exposure

2020 ◽  
Vol 23 (8) ◽  
pp. 1521-1533 ◽  
Author(s):  
Chaojie Song ◽  
Gang Zhang ◽  
Wei Hou ◽  
Shuanhai He
Keyword(s):  
Fire Resistance ◽  
Prestressed Concrete ◽  
Load Level ◽  
Concrete Cover ◽  
Bridge Girders ◽  
Fire Exposure ◽  
Bridge Girder ◽  
Prestressing Strands ◽  
Cover Thickness ◽  
Exposure Length

This article presents an approach for investigating performance of prestressed concrete box bridge girders under hydrocarbon fire exposure. A three-dimensional nonlinear finite element model, developed in computer program ANSYS, is utilized to analyze the response of prestressed concrete box bridge girders under combined effects of fire exposure duration and simultaneous structural loading. The model validation is performed using a scaled prestressed concrete box girder exposed to ISO834 fire in furnace. Subsequently, the validated model is used to investigate fire performance of prestressed concrete box bridge girders through taking into consideration some variables, namely concrete cover thickness to prestressing strands, prestress degree, load level, fire exposure length, and position. Through a case study, results from numerical analysis show that concrete cover thickness to prestressing strands and load level has significant effect on fire resistance of prestressed concrete box bridge girders. Increasing prestress degree in prestressing strands can speed up the progression of deflection (sudden collapse) in prestressed concrete box bridge girder toward the final fire exposure stage. Reducing fire exposure length or preventing fire exposure on mid-span zone can highly enhance the fire resistance of simply supported prestressed concrete box bridge girders. Failure of prestressed concrete box bridge girder, under hydrocarbon fire exposure conditions, is governed by rate of deflection failure criterion in particular cases.

scholarly journals Utilization of Numerical Techniques to Predict the Thermal Behavior of Wood Column Subjected to Fire Part B: Analysis of Column Temperature and Fire Resistance

2006 ◽  
Vol 306-308 ◽  
pp. 583-588
Author(s):  
Mohamed ElShayeb ◽  
Abdul Rashid Ab Malik ◽  
Fazril Ideris ◽  
Zolman Hari ◽  
Norhaida Ab Razak ◽  
...  
Keyword(s):  
Mathematical Models ◽  
Cross Section ◽  
Fire Resistance ◽  
Applied Load ◽  
The Other ◽  
Temperature History ◽  
Numerical Techniques ◽  
Column Temperature ◽  
Section Size ◽  
Failure Point

Mathematical models of Part A [1] are used to calculate the temperatures, deformations and fire resistance of rectangular, hexagonal, octagonal and I-cross section columns for the purpose of Part B. In this paper the comparison among the configurations of the column has been carried out to predict the temperature history for the column elements for preventing the spread of fire and prolonging the structural time collapse. The columns are varied in section size, among them are the rectangular, hexagonal, octagonal and I-cross section column of Keruing timber. The developed mathematical models defined the failure point as the point which the column can no longer support the applied load. From the comparison, the I-cross section column is the worst configuration than the other configuration.

scholarly journals Finite Element Modelling of the Fire Resistance of Double Skin Composite Walls Subjected to Monotonic Compressive Loading

2021 ◽  
Author(s):  
Mohamed Yanis Bournas
Keyword(s):  
Finite Element ◽  
Fire Resistance ◽  
High Performance Concrete ◽  
Compressive Load ◽  
Load Level ◽  
Concrete Core ◽  
Steel Sheets ◽  
Double Skin ◽  
Composite Wall ◽  
Composite Walls

The fire resistance of double skin composite wall (DSCW) system composed of two profiled steel sheets and concrete infill is investigated through use of finite element (FE) methods. The fire resistance of DSCW when exposed to elevated temperature and a constant axial compressive load with different infill materials such as self-consolidating concrete (SCC), engineered cementitious concrete (ECC) and ultra-high performance concrete (UHPC) is investigated. The influence of parameters such as load level, thickness of steel sheets, depth of concrete core and fastener arrangement on the fire resistance of the DSCW are established. The performance of SCC-based DSCW has the best fire resistance followed by ECC and UHPC-based composite walls. The increase in load level decreases the fire resistance while the increase in depth of concrete infill increases the fire resistance of the composite wall. The fastener arrangement and steel thickness have no significant influence on the resulting fire resistance.

Structural behaviour of concrete filled hollow steel sections exposed to parametric fire

2017 ◽  
Vol 3 (4) ◽  
pp. 160
Author(s):  
Mohammed Salah Dimia ◽  
Soumia Sekkiou ◽  
Mohamed Baghdadi ◽  
Mohamed Guenfoud
Keyword(s):  
Steel Tube ◽  
Concrete Cover ◽  
Critical Conditions ◽  
Structural Behaviour ◽  
Natural Fire ◽  
Composite Columns ◽  
Section Size ◽  
Fire Scenarios ◽  
Steel Sections ◽  
Cooling Phase

This article analyzes steel-concrete composite columns subjected to natural fire scenarios in order to verify that the possibility of structural collapse during or after the cooling phase is real. The main objectives of this study are: first, to highlight the phenomenon of delayed collapse of this type of columns during or after the cooling phase of a fire, and then analyze the influence of some determinant parameters, such as section size, tube thickness, reinforcement (ratio), concrete cover and column length. The results show that critical conditions with respect to delayed failure arise for massive sections, small values of the steel tube thickness and for columns with massive section.

Sign in / Sign up

Export Citation Format

Share Document