scholarly journals Feature of fire resistance calculation of steel structures with intumescent coating

2018 ◽  
Vol 230 ◽  
pp. 02036 ◽  
Author(s):  
Alexey Vasilchenko ◽  
Yuriy Otrosh ◽  
Nikolay Adamenko ◽  
Evgeny Doronin ◽  
Andrey Kovalov
Keyword(s):  
Fire Resistance ◽  
Steel Structure ◽  
Steel Structures ◽  
Metal Structure ◽  
Heating Time ◽  
Steel Frame ◽  
Frame Structures ◽  
Intumescent Coating ◽  
Intumescent Coatings ◽  
Steel Frame Structures

The problem of estimation of fire resistance of steel frame structures with intumescent coatings is considered. It implies that both physical properties of a covering (its thickness and structure) and mechanical properties of a metal structure change critically at heating. All above changes should be considered to maintain the standard values of fire resistance of a construction at calculation. Usually, known technical characteristics of fire resistance of intumescent coverings are used for estimation of fire resistance of steel structures with intumescent coverings. Importance of taking into account the influence of strength loss time at heating of a steel structure on calculation of fire resistance limit of system “intumescent fireproof coating steel structure” is shown in the article. On an example of calculation of heating time to the critical temperature of steel columns and beams protected by intumescent coating, it is shown that own heating time of steel structures before they lose strength makes 10 to 16 % from a settlement limit of fire resistance. This fact should be considered at the forecast of fire resistance of steel frame structures with intumescent coatings.

A Second-Order Inelastic Analytical Method on Semirigid Connections Steel Frame

2010 ◽  
Vol 163-167 ◽  
pp. 760-765
Author(s):  
Jian Liu ◽  
Xiang Yun Huang ◽  
Ji Ping Hao ◽  
Guan Gen Zhou ◽  
Deng Feng Peng
Keyword(s):  
Axial Force ◽  
Steel Structure ◽  
Steel Frame ◽  
Second Order ◽  
Frame Structures ◽  
Stability Function ◽  
Inelastic Analysis ◽  
Semirigid Connections ◽  
Steel Frame Structures ◽  
Shearing Deformation

A second-order inelastic analysis of semirigid connection steel frame structures is developed. Therein, shearing deformation and axial force simultaneously are considered. A new stability function considered shearing deformation and axial force simultaneously is proposed and the analysis methods for steel structure of semirigid connection based on the structural ultimate bearing capacity are established. The calculatical programe of second-order inelastic analysis semirigid connection steel frame structures is compiled. The numerical examples of steel frames for semirigid connection are analysed using the second-order inelastic analysis in the paper. Load–displacements predicted by the proposed analysis compare well with those given by other approaches. The analysis results show that the proposed method is suitable for adoption in practice.

Effect of Residual Deformation of a Steel Column on its Fire Resistance under Combined Exposure "Explosion-Fire"

2019 ◽  
Vol 968 ◽  
pp. 288-293 ◽  
Author(s):  
Alexey Vasilchenko ◽  
Evgeny Doronin ◽  
Boris Ivanov ◽  
Vladimir Konoval
Keyword(s):  
Fire Resistance ◽  
Residual Deformation ◽  
Fire Retardant ◽  
Steel Structure ◽  
Steel Structures ◽  
Heating Time ◽  
Industrial Facilities ◽  
Steel Columns ◽  
Steel Column ◽  
The Stability

Calculations on the example of a steel column showed that with the combined effect of an explosion that causes deformation and subsequent fire, even without damaging the fire-retardant coat, there is a significant decrease in the fire resistance of the structure due to a decrease in the critical temperature. It is shown that, on the basis of the methodology proposed in this work, for hazardous operations industrial facilities, it is possible to predict the stability of steel columns in crash explosions followed by fire, as well as to recommend the values ​​of workloads and parameters of fire-retardant coats providing the necessary stability. It is also shown that when calculating the fire resistance limit of a steel structure with intumescent fire-retardant coat, it is necessary to take into account the proper heating time of steel structures until they lose strength.

scholarly journals Seismic retrofit of steel frame structures

2020 ◽  
Vol 15 (2) ◽  
pp. 106-117
Author(s):  
Magdy Ismail
Keyword(s):  
Seismic Hazard ◽  
Numerical Study ◽  
Steel Structures ◽  
Seismic Retrofit ◽  
Steel Frame ◽  
Frame Structures ◽  
Base Shear ◽  
Seismic Force ◽  
Moment Resisting ◽  
Steel Frame Structures

Abstract:Moment resisting frames are considered as an effective seismic force resisting system that is used for steel structures. Some of these structures that were built in high seismic hazard zones were designed according to old strength-based design codes. Currently, these structures do not meet the requirements of the new seismic codes. Therefore, the seismic retrofit of these structures is mandatory and cannot be overlooked. Steel braces and concrete-steel composite elements are common solutions for enhancing the seismic behavior of existing steel frame structures. This paper presents a numerical study that evaluates different possible techniques for the seismic retrofit of existing steel moment-resisting frame structures. The study investigates the performance of three multi-story buildings with different heights that are located in a high seismic hazard zone. Three retrofit techniques were introduced including; 1) X-Steel braces, 2) buckling restrained composite braces, and 3) composite concrete-steel plate shear walls. The seismic performance enhancement of the studied structures was evaluated in terms of the structure’s fundamental period, maximum inter-story drift and maximum base shear-to-weight ratios. Moreover, the cost of retrofitting material was estimated for each technique and they were compared to select the retrofit technique with the least constitutive material cost.

scholarly journals SAOSYS TOOLBOX AS MATLAB IMPLEMENTATION IN THE ELASTIC‐PLASTIC ANALYSIS AND OPTIMAL DESIGN OF STEEL FRAME STRUCTURES

2010 ◽  
Vol 16 (1) ◽  
pp. 103-121 ◽  
Author(s):  
Valentinas Jankovski ◽  
Juozas Atkočiūnas
Keyword(s):  
Optimal Design ◽  
Finite Elements ◽  
Deformable Body ◽  
Steel Structures ◽  
Steel Frame ◽  
Frame Structures ◽  
Industrial Building ◽  
Steel Frame Structures ◽  
Internal Forces ◽  
Strength And Stiffness

The improved mathematical model of steel frame structures’ design is created. The loading is simple, and plastic strains are evaluated. Energy principles of deformable body mechanics and mathematical programming theory are employed. Equilibrium finite elements with interpolation functions of internal forces are used for discretization. The elements are designed using HE, IPE, RHS steel profile assortments and considering dispersion of geometrical characteristics of profile assortment sets. Optimal design of steel structures is realized by using the experimental tool system JWM SAOSYS Toolbox v0.42, which was created by the authors in MATLAB environment. SAOSYS architecture operates with object‐oriented finite elements pseudo‐polymorphously. The possibilities of this system are demonstrated by considering a numerical example of optimal design of industrial building frame with strength and stiffness constraints. The assumption of small displacements is adopted for computations. Santrauka Pasitelkus deformuojamo kūno mechanikos energinius principus ir matematinio programavimo teorija, sudarytas minimalaus tūrio strypiniu plieniniu konstrukciju, patyrusiu ir plastines deformacijas, projektavimo nuo vienkartes apkrovos uždavinio patobulintas matematinis modelis. Diskretizacijai naudojami pusiausvirieji baigtiniai elementai su iražu interpo‐liavimo funkcijomis. Elementai projektuojami iš sortimentiniu HE, IPE, RHS plieniniu profiliuočiu, atsižvelgiant i profi‐liuočiu aibiu geometriniu charakteristiku sklaida sortimentuose. Optimalus plieniniu konstrukciju projektavimas realizuojamas autoriu MATLAB aplinkoje sukurta eksperimentine sistema JWM SAOSYS Toolbox v0.42. SAOSYS architektūra pseudopolimorfiškai operuoja objektiškai orientuotais baigtiniais elementais. Sistemos SAOSYS galimybes atskleidžiamos pramoninio pastato remo optimalaus projektavimo su stiprumo ir standumo apribojimais pavyzdžiu. Skaičiuota atsižvelgus i mažu poslinkiu prielaidas.

Dynamic Characteristics of Base-Isolated Steel Frame under Seismic Ground Motion

2011 ◽  
Vol 255-260 ◽  
pp. 2341-2344
Author(s):  
Mohammad Saeed Masoomi ◽  
Siti Aminah Osman ◽  
Ali Jahanshahi
Keyword(s):  
Ground Motion ◽  
Base Isolation ◽  
Time History ◽  
Steel Structure ◽  
Steel Structures ◽  
Steel Frame ◽  
Nonlinear Time History Analysis ◽  
Seismic Load ◽  
Vector Method ◽  
Seismic Ground Motion

This paper presents the performance of base-isolated steel structures under the seismic load. The main goals of this study are to evaluate the effectiveness of base isolation systems for steel structures against earthquake loads; to verify the modal analysis of steel frame compared with the hand calculation results; and development of a simulating method for base-isolated structure’s responses. Two models were considered in this study, one a steel structure with base-isolated and the other without base-isolated system. The nonlinear time-history analysis of both structures under El Centro 1940 seismic ground motion was used based on finite element method through SAP2000. The mentioned frames were analyzed by Eigenvalue method for linear analysis and Ritz-vector method for nonlinear analysis. Simulation results were presented as time-acceleration graphs for each story, period and frequency of both structures for the first three modes.

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