Improved calculation method for insulation-based fire resistance of composite slabs

2019 ◽  
Vol 105 ◽  
pp. 144-153 ◽  
Author(s):  
Jian Jiang ◽  
Adam Pintar ◽  
Jonathan M. Weigand ◽  
Joseph A. Main ◽  
Fahim Sadek
Keyword(s):  
Fire Resistance ◽  
Calculation Method ◽  
Composite Slabs

scholarly journals Numerical simulation of the fire resistance of composite slabs with steel deck

2018 ◽  
Vol 7 (2.23) ◽  
pp. 83 ◽  
Author(s):  
Paulo A. G. Piloto ◽  
Lucas M.S. Prates ◽  
Carlos Balsa ◽  
Ronaldo Rigobello
Keyword(s):  
Numerical Simulation ◽  
Fire Resistance ◽  
Calculation Method ◽  
Simple Calculation ◽  
Concrete Layer ◽  
Composite Slabs ◽  
Composite Solution ◽  
Steel Deck ◽  
Loadbearing Capacity ◽  
Methods Numerical

This investigation is related with the fire resistance of composite slabs with steel deck. This composite solution consists of a concrete topping cast on the top of a steel deck. The concrete is typically reinforced with a steel mesh and may also contain individual rebars. The deck also acts as reinforcement and may be exposed to accidental fire conditions from the bottom. This composite solution is widely used in every type of buildings and requires fire resistance, in accordance to regulations. The fire resistance is specified by the loadbearing capacity (R), insulation (I) and integrity (E). The fire rating for (R) and (E) is not in the scope of this investigation. The fire rating for insulation (I) is evaluated by two different methods (numerical simulation and simple calculation). The fire rating is calculated for 32 different geometric configuration, in order to evaluate the effect of the thickness of the concrete layer and the thickness of steel deck. The fire resistance (I) increases with the thickness of the concrete when using both methods, but the simple calculation method seems to be unsafe for all the cases, requiring a revision for the formulae presented in Annex D of EN1994-1-2. A new proposal is presented.  

scholarly journals Fire resistance of timber-concrete composite slabs

2020 ◽  
Vol 53 (4) ◽  
Author(s):  
Anita Ogrin ◽  
Tomaž Hozjan
Keyword(s):  
Fire Resistance ◽  
Composite Slabs

Practical Calculation Method for the Bearing Capacity at High Temperature of Concrete Filled Steel Tubular Columns Subjected to Fire

2014 ◽  
Vol 1065-1069 ◽  
pp. 1358-1362
Author(s):  
Jin Sheng Han ◽  
Hao Ran Liu ◽  
Shu Ping Cong
Keyword(s):  
High Temperature ◽  
Bearing Capacity ◽  
Fire Resistance ◽  
Calculation Method ◽  
Engineering Application ◽  
Practical Calculation ◽  
Tubular Columns ◽  
Calculation Results ◽  
Simplified Calculation ◽  
Simplified Calculation Method

The fire resistance of concrete filled steel tubular column is usually obtained by the numerical analysis method, which is difficult to operate and not convenient in the actual civil engineering. So it is necessary to study the simplified calculation method. A large number of numerical simulation results of the temperature distribution of the section and the bearing capacity at high temperature of the concrete filled steel tubular columns are analyzed. The influences of secondary parameters are simplified. The simplified calculation method at 150 min and 180 min for the bearing capacity at high temperature of concrete filled steel tubular columns subjected to axial compression and fire is presented on the basis of comprehensive analysis of the numerical calculation results. The calculation results can be used as the basis to judge the fire resistance. It is shown by the comparison with the experimental results that the precision of the simplified calculation method can meet the requirements of engineering application.

scholarly journals Recalculation of Laboratory Tests with the Extended Zone Method

2016 ◽  
Author(s):  
Marcus Achenbach ◽  
Guido Morgenthal
Keyword(s):  
Fire Resistance ◽  
Calculation Method ◽  
Laboratory Tests ◽  
Concrete Columns ◽  
Not Given ◽  
Zone Method ◽  
Compression Members ◽  
Design Software ◽  
Extended Zone

The Advanced Calculation Method given in EN 1992-1-2 is accepted by engineers and building authorities for the determination of the fire resistance of reinforced concrete structures. It has been developed originally for the recalculation of laboratory tests: the time of failure is calculated for a given layout of reinforcement. But in the structural analysis of concrete columns, the area of reinforcement has to be calculated for a desired fire resistance. Design methods and strategies, which are suitable for the design of concrete compression members, require constant material properties and strain limits, which are not given for the Advanced Calculation Method. Therefore Achenbach and Morgenthal have proposed an extension of the Zone Method by Hertz, suitable for the implementation in commercial design software. In this paper, this Extended Zone Method is used to recalculate laboratory tests to determine the accuracy of this method. A statistical analysis of the results is performed to evaluate the statistical key data of the Extended Zone Method.

Fire resistance of composite slabs with steel deck under natural fire

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Paulo A.G. Piloto ◽  
Carlos Balsa ◽  
Felipe Macedo Macêdo Gomes ◽  
Bergson Matias
Keyword(s):  
Fire Resistance ◽  
Numerical Models ◽  
Three Dimensional ◽  
Composite Slab ◽  
Content Type ◽  
Natural Fire ◽  
Fire Scenario ◽  
Composite Slabs ◽  
Cooling Phase ◽  
Steel Deck

PurposeMost of the numerical research and experiments on composite slabs with a steel deck have been developed to study the effect of fire during the heating phase. This manuscript aims to describe the thermal behaviour of composite slabs when submitted to different fire scenarios, considering the heating and cooling phase.Design/methodology/approachThree-dimensional numerical models, based on finite elements, are developed to analyse the temperatures inside the composite slab and, consequently, to estimate the fire resistance, considering the insulation criteria (I). The numerical methods developed are validated with experimental results available in the literature. In addition, this paper presents a parametric study of the effects on fire resistance caused by the thickness of the concrete part of the slab as well as the natural fire scenario.FindingsThe results show that, depending on the fire scenario, the fire resistance criterion can be reached during the cooling phase, especially for the thickest composite slabs. Based on the results, new coefficients are proposed for the original simplified model, proposed by the standard.Originality/valueThe developed numerical models allow us to realistically simulate the thermal effects caused by a natural fire in a composite slab and the new proposal enables us to estimate the fire resistance time of composite slabs with a steel deck, even if it occurs in the cooling phase.

A Design Model for the Fire Resistance of Timber-Concrete Composite Slabs

2001 ◽  
Vol 85 (10) ◽  
pp. 35-40 ◽  
Author(s):  
Andrea Frangi ◽  
Mario Fontana
Keyword(s):  
Fire Resistance ◽  
Design Model ◽  
Composite Slabs

Effect of the load level on the resistance of composite slabs with steel decking under fire conditions

2020 ◽  
Vol 38 (2) ◽  
pp. 212-231
Author(s):  
Paulo AG Piloto ◽  
Carlos Balsa ◽  
Lucas MC Santos ◽  
Érica FA Kimura
Keyword(s):  
Experimental Data ◽  
Fire Resistance ◽  
Parametric Analysis ◽  
Simple Calculation ◽  
Load Level ◽  
Calculation Methods ◽  
Composite Slabs ◽  
Perfect Contact ◽  
Steel Deck ◽  
Calculation Models

The fire resistance of composite slabs with steel decking, in Europe, is usually defined using simple calculation models provided by the Eurocode EN 1994-1-2. For assessing the methodology of these simple calculation methods, a new advanced calculation method is presented, using the software ANSYS. The numerical model is first validated with experimental data reported on bibliography and then a parametric analysis is conducted to better understand the effect of the load level on the composite structure under fire. The validation of the simulations consisted of three different models: the first model considers perfect contact between the steel deck and the concrete topping, and the two following models consider the existence of an air gap between these materials, acting as a thermal resistance on the temperature field through the thickness of the slab. The numerical results show good approximation to the experimental results, mainly when using the non-perfect contact model, reaching 3.88% and 16.91% of difference with respect to the insulation and load-bearing criteria, respectively. Based on the validation models, a parametric study is presented, modifying the load level from 10% up to 75%. New simple calculation models are presented to define the fire resistance of composite slabs, considering the load level, and the debonding effect between the concrete and the steel deck.

Comparative experimental study of fire resistance of two-way restrained and unrestrained precast concrete composite slabs

2020 ◽  
Vol 118 ◽  
pp. 103225
Author(s):  
Qingfeng Xu ◽  
Lingzhu Chen ◽  
Xiangmin Li ◽  
Chongqing Han ◽  
Yong C. Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fire Resistance ◽  
Precast Concrete ◽  
Composite Slabs
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