Calculations on the fire resistance of steel reinforced concrete (SRC) columns

2005 ◽  
pp. 1017-1022 ◽  
Author(s):  
Y ZHENG ◽  
L HAN
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Steel Reinforced Concrete

Calculation of Ultimate Bearing Capacity of Prestressed Steel Reinforced Concrete Structure under Fire

2011 ◽  
Vol 250-253 ◽  
pp. 2857-2860 ◽  
Author(s):  
Yu Zhuo Wang ◽  
Chuang Guo Fu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Fire Resistance ◽  
Concrete Structure ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Ultimate Bearing Capacity ◽  
Reinforced Concrete Structure ◽  
Steel Reinforced Concrete ◽  
Resistance Performance

Prestressed steel reinforced concrete structure, compared with other concrete structure has its unique advantages. So it is mainly used in large span and conversion layers. With the popularization of this structure,more attention should be payed on fire resistance performance. On the basis of reasonable assume,two steps model is used as concrete high strength calculation model. Simplified intensity decreased curve is used as rebar,steel and prestressed. Two ultimate bearing capacity formulas of prestressed steel reinforced concrete beam are established. One is for the beam whose tensile area is under fire, the other is for the beam whose compression area is under fire. Prestressed steel reinforced concrete structure has both prestressed concrete structure’s advantages and steel reinforced concrete structure ’s advantage. Steel reinforced concrete is used to improve the bearing capacity of the structure. Prestressed steel is used to improve the ultimate state of structure’s performance during normal use. Thereby structure’s performance is better to play. There are many similarities between prestressed steel reinforced concrete structure and steel reinforced concrete structure about fire resistance performance. Because of prestressed steel reinforced concrete structure’s own characteristics, there are still many problems about fire resistance. This paper mainly presented bending terminal bearing capacity of prestressed steel reinforced concrete beam under fire. Established simplified formulae for calculation, it is meet the engineering accuracy requirement.

Experimental and numerical investigations of fire resistance of continuous high strength steel reinforced concrete T-beams

2015 ◽  
Vol 78 ◽  
pp. 142-154 ◽  
Author(s):  
Qingfeng Xu ◽  
Chongqing Han ◽  
Yong C. Wang ◽  
Xiangmin Li ◽  
Lingzhu Chen ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Reinforced Concrete ◽  
Numerical Investigations

scholarly journals Analysis of Concrete-Filled Steel Tube Reinforced Concrete Column-Steel Reinforced Concrete Beam Plane Frame Structure Subjected to Fire

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yanhong Bao ◽  
Bowen Chen ◽  
Lei Xu
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Load Ratio ◽  
Reinforced Concrete Beam ◽  
Steel Tube ◽  
Frame Structure ◽  
Fire Load ◽  
Steel Reinforced Concrete ◽  
Plane Frames ◽  
Plane Frame

The ABAQUS finite-element analysis platform was used to understand the mechanical behavior of concrete-filled steel tube reinforced concrete (CFSTRC) columns and steel reinforced concrete (SRC) beam plane frames under fire conditions. Thermal parameters and mechanical constitutive model of steel and concrete materials were reasonably selected, the correct boundary conditions were chosen, and a numerical model for the thermal mechanical coupling of CFSTRC columns and SRC beam plane frame structure was established. The finite-element model was verified from related experimental test results. The failure modes, deformation, and internal force distribution of the CFSTRC column and SRC beam plane frames were analyzed under ISO-834 standard fire conditions and with an external load. The influence of beam and column fire-load ratio on the fire resistance of the frame structure was established, and the fire-resistance differences between the plane frame structures and columns were compared. The CFSTRC column-steel reinforced concrete beam plane frame may undergo beam failure or the column and beam may fail simultaneously. The frame structure fire-resistance decreased with an increase of column and beam fire-load ratio. The column and beam fire-load ratio influence the fire resistance of the frames significantly. In this numerical example, the fire resistance of the frames is less than the single columns. It is suggested that the fire resistance of the frame structure should be considered when a fire-resistant structural engineering design is carried out.

Predicting fire resistance of SRC columns through gene expression programming

2020 ◽  
Vol 12 (2) ◽  
pp. 125-140
Author(s):  
Meisam Hassani ◽  
Mohammad Safi ◽  
Reza Rasti Ardakani ◽  
Amir Saedi Daryan
Keyword(s):  
Gene Expression ◽  
Experimental Data ◽  
Reinforced Concrete ◽  
Fire Resistance ◽  
Elevated Temperatures ◽  
Gene Expression Programming ◽  
Effective Parameters ◽  
Content Type ◽  
Geometrical Properties ◽  
Steel Reinforced Concrete

Purpose This paper aims to predict the fire resistance of steel-reinforced concrete columns by application of the genetic algorithm. Design/methodology/approach In total, 11 effective parameters are considered including mechanical and geometrical properties of columns and loading values as input parameters and the duration of concrete resistance at elevated temperatures as the output parameter. Then, experimental data of several studies – with extensive ranges – are collected and divided into two categories. Findings Using the first set of the data along with the gene expression programming (GEP), the fire resistance predictive model of steel-reinforced concrete (SRC) composite columns is presented. By application of the second category, evaluation and validation of the proposed model are investigated as well, and the correspondent time-temperature diagrams are derived. Originality/value The relative error of 10% and the R coefficient of 0.9 for the predicted model are among the highlighted results of this validation. Based on the statistical errors, a fair agreement exists between the experimental data and predicted values, indicating the appropriate performance of the proposed GEP model for fire resistance prediction of SRC columns.

scholarly journals Determination of features of composite steel and concrete slab behavior under fire condition

2021 ◽  
Vol 6 (7 (114)) ◽  
Author(s):  
Valeriia Nekora ◽  
Stanislav Sidnei ◽  
Taras Shnal ◽  
Olga Nekora ◽  
Iryna Dankevych ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Temperature Distribution ◽  
Fire Resistance ◽  
Temperature Regime ◽  
Strain State ◽  
Concrete Slabs ◽  
Standard Temperature ◽  
Steel Reinforced Concrete ◽  
Steel Sheets ◽  
Reinforced Concrete Slabs

Methods for calculating the fire resistance of steel-reinforced concrete slabs made using profiled steel sheets under the influence of a standard temperature regime for more than 120 minutes are considered and analyzed. Research has been carried out to determine the heating parameters and the stress-strain state of steel-reinforced concrete slabs made using profiled steel sheets under fire conditions for more than 120 minutes. The results of this study allow to obtain indicators of temperature distribution for assessing the fire resistance of such structures for fire resistance classes above REI 120. Accordingly, the results obtained are a scientific basis for improving the existing method for calculating the fire resistance of steel-reinforced concrete slabs made using profiled steel sheets. The temperature distribution in the cross-section of structures was obtained using a general theoretical approach to solving the problem of heat conduction using the finite element method. Using the obtained temperature distributions, the parameters of the stress-strain state were determined based on the method of limiting states. To carry out the calculations, appropriate mathematical models were created that describe the effect of the standard temperature regime of a fire, to determine the temperature distribution at every minute in the sections of steel-reinforced concrete slabs with profiled steel sheets. A method is proposed for dividing the section into zones to take into account the decrease in the indicators of the mechanical properties of concrete and steel. A simplified method for the design assessment of steel-reinforced concrete slabs made using profiled steel sheets is proposed, which is consistent with the current EU standards and can be effectively used to analyze their fire resistance when establishing their compliance with the fire resistance class REI 120 and higher.

scholarly journals Evaluation of the fire resistance of steel-reinforced concretefilled steel tubular columns with a circular cross-section

2022 ◽  
Vol 2153 (1) ◽  
pp. 012005
Author(s):  
J P Rojas Suárez ◽  
J A Pabón León ◽  
M S Orjuela Abril
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Cross Sections ◽  
Fire Resistance ◽  
Circular Cross Section ◽  
Experimental Tests ◽  
Steel Reinforced Concrete ◽  
Tubular Columns ◽  
Temperature Levels ◽  
Physical Phenomena

Abstract In the present investigation, an analysis of the fire resistance of the steel-reinforced concrete-filled steel tubular columns with circular cross-sections was carried out by means of numerical simulation. The development of the study was carried out by means of numerical simulation to predict the behavior of the column against fire. The results of the numerical model are validated by comparing the temperature levels obtained through experimental tests. From the results obtained, it is shown that the increase in the contact area between the steel and the concrete reduces the average temperature of the column, which implies a greater resistance to fire. The fire resistance of the columns with the steel profile designs are between 3.4 - 3.6 times higher compared to the column only made of concrete, which is an indication of the excellent performance of the steel-reinforced concrete-filled steel tubular columns with circular cross- sections columns. In general, the methodology proposed in this research allows the analysis of the thermal physical phenomena of the different columns used for the construction of buildings.

Calculation Of Fire Resistance Of Compressed Reinforced Concrete Elements Taking Into Account The Heat And Technical Characteristics Of Reinforcement

2020 ◽  
pp. 37-41
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Fire Resistance ◽  
Thermal Characteristics ◽  
Temperature Fields ◽  
Thermal Calculation ◽  
Steel Reinforced Concrete ◽  
Concrete Elements ◽  
Account Temperature

The calculation of fire resistance of reinforced concrete elements depends on the accuracy of the thermal calculation. When performing this calculation, the distribution of the temperature field over the cross section of the element and the strength characteristics that depend on it are determined. The temperature distribution over the section of the structure depends on such parameters as the heat capacity and thermal conductivity of the section parts, and its humidity. The article considers an approach to solving the problem of taking into account the actual temperature field when calculating the fire resistance of reinforced concrete and steel-reinforced concrete elements. Fire resistance calculations were performed for temperature fields that do not take into account the inclusion of reinforcement (concrete section), as well as for temperature fields that take into account temperature inclusions. For the section under consideration, additional coefficients are calculated, which are entered into the calculation of fire resistance when using the method STO 36554501-006-2006 "Rules for ensuring the fire resistance and fire safety of reinforced concrete structures". According to the results of this work, an increase in the bearing capacity of rectangular and square sections was noted when calculating with regard to the thermal characteristics of the reinforcement.

Performance of Steel-Reinforced Concrete-Filled Stainless Steel Tubular Columns at Elevated Temperature

2018 ◽  
Vol 19 (01) ◽  
pp. 1940002 ◽  
Author(s):  
Qinghua Tan ◽  
Leroy Gardner ◽  
Linhai Han
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Fire Resistance ◽  
Structural Engineering ◽  
Failure Modes ◽  
Elevated Temperatures ◽  
Offshore Structures ◽  
Axial Deformation ◽  
Steel Reinforced Concrete ◽  
Tubular Columns

Steel-reinforced concrete-filled stainless steel tubular (SRCFSST) columns combine the advantages of concrete-filled stainless steel tubular (CFSST) columns and steel-reinforced concrete (SRC) columns, resulting in excellent corrosion resistance, good economy, good ductility, and excellent fire resistance. Thus, SRCFSST columns have many potential structural engineering applications, especially in offshore structures. The performance of SRCFSST columns at elevated temperatures is investigated by finite element (FE) analysis in this paper. Firstly, FE models capable of capturing the full load-deformation response of structural members at elevated temperatures are developed and validated against relevant published tests on CFSST and SRC columns under fire conditions. Based on the validated FE models, the behavioral mechanisms of the SRCFSST columns under fire are explained by analysis of the sectional temperature distribution, typical failure modes, axial deformation versus time response, and load redistribution. Finally, the fire resistance of SRCFSST columns is evaluated in comparison to CFSST columns with equivalent sectional load-bearing capacity at ambient temperature or equivalent steel ratios. The results lay the foundation for the development of fire resistance design rules for SRCFSST columns.

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