scholarly journals MODELLING COLUMN BASES OF SEMI-RIGID STEEL FRAMES: STIFFNESS AND STRENGTH CALCULATION / PUSIAU STANDŽIŲ PLIENINIŲ RĖMŲ PĖDŲ MODELIAVIMAS, STANDŽIO IR STIPRIO NUSTATYMAS

2012 ◽  
Vol 4 (4) ◽  
pp. 300-305
Author(s):  
Žilvinas Bučmys ◽  
Rimtautas Dališanskis
Keyword(s):  
Finite Element ◽  
Nonlinear Analysis ◽  
Steel Frames ◽  
Base Plate ◽  
Linear Analysis ◽  
Calculation Methods ◽  
Anchor Bolt ◽  
Solid Works ◽  
Column Bases ◽  
Column Base

The paper examines the models and stiffness efficiency of the column base of semi-rigid steel frames, reviews stiffness calculation methods and calculates the rotation of column base connection in two ways: analytical, according to LST EN 1993-1-8, and finite element, applying nonlinear analysis. Two groups of modelling have been made: the first group deals with changes in the thickness of the base plate; the second one shows a different diameter of the anchor bolt. The obtained results reveal the influence of the base plate and anchor bolt on the stiffness of column base connection. The article discusses differences in the euro code and linear analysis: minimum difference makes 61,6% and maximum – 73,7%. For calculating the strength of the column base, a conservative model has been employed, i.e. according to the Eurocode, the received values are smaller compared to nonlinear analysis: minimum difference makes 37,0% and maximum – 49,0%. Santrauka Nagrinėjamas pusiau standžių plieninių rėmų pėdų modeliavimas ir standumo nustatymo efektyvumas. Apžvelgti kolonos pėdų standumo nustatymo metodai. Apskaičiuotas kolonos pėdos pasisukimas dviem būdais: pagal analitines išraiškas, kurios pateiktos LST EN 1993-1-8 dalyje, ir baigtinių elementų programą „Solid Works“ taikant netiesinę analizę. Sumodeliuotos dvi grupės: pirmojoje keičiamas pėdos pamatinės plokštės storis, o kitoje – inkarinio varžto skersmuo. Rezultatai rodo kolonos pėdos komponentų inkarinio varžto ir pamatinės plokštės įtaką bazės kampiniam posūkiui. Iš gautų rezultatų matyti, kad pagal Eurokodą ir netiesinę analizę kampiniai posūkiai skiriasi. Mažiausias skirtumas yra 61,6 %, o didžiausias – 73,7 %. Atliekant pėdos stiprumo skaičiavimus taikomas konservatyvus modelis – skaičiuojant pagal Eurokodą 3 gautos mažesnės reikšmės negu taikant netiesinę analizę. Mažiausias skirtumas yra 37,0 %, o didžiausias – 49,0 %.

The Nonlinear Finite Element Analysis of the Rigid Steel Column Base Connection with Anchor Bolt under Biaxial Bending

2015 ◽  
Vol 733 ◽  
pp. 460-463
Author(s):  
Fan Zhou ◽  
Cheng Yu Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Interaction Analysis ◽  
Nonlinear Finite Element Analysis ◽  
Nonlinear Finite Element ◽  
Biaxial Bending ◽  
Element Analysis ◽  
Anchor Bolt ◽  
Steel Column ◽  
Column Base

The nonlinear finite element analysis of the rigid steel column base connection with anchor bolt under biaxial bending, including the column base stiffeners, base plate, anchor bolts and other nonlinear interaction analysis, to provide a frame of reference for the rigid steel column base connection’ designed.

scholarly journals MECHANICAL PRORERTIES OF EXPOSED COLUMN BASE CONNECTIONS FOR L-SHAPED COLUMNS FABRICATED USING CONCRETE-FILLED STEEL TUBES

2021 ◽  
Keyword(s):  
Finite Element ◽  
Base Plate ◽  
Hysteresis Phenomenon ◽  
Hysteretic Model ◽  
Backbone Curve ◽  
Element Analysis ◽  
Plate Size ◽  
Physical Response ◽  
Base Connections ◽  
Column Base

The response of exposed column base connections for L-shaped column is investigated through finite element analysis (FEA) in this paper which is affected by complex interactions among different components. Three finite element models are constructed to simulate the response of these connections under axial and cyclic horizontal loading, which interrogate a range of variables including anchor rod strength, base plate size and thickness. The results of the simulations provide insights into internal stress distributions which have not been measured directly through experiments. The key findings indicate that thicker base plates tend to shift the stresses to the toe of the base plate, while thinner plates concentrate the stresses under the column flange. Base on the analytical results, a hysteretic model is proposed to describe the cyclic moment-rotation response of exposed column base connections. The core parameters used to define the backbone curve of the hysteretic model are calibrated through configurational details. The comparison between the simulation and the calculated values indicates that the hysteretic model is suitable to characterize the key aspects of the physical response, including pinching, recentering and flag-shaped hysteresis phenomenon. Limitations of the model are outlined.

scholarly journals Elaboration of Design and Optimization Methods for a Newly Developed CFRP Sandwich-like Structure Validated by Experimental Measurements and Finite Element Analysis

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4348
Author(s):  
György Kovács
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cost Optimization ◽  
Base Plate ◽  
Optimization Method ◽  
Industrial Applications ◽  
Experimental Measurements ◽  
Light Weight ◽  
Calculation Methods ◽  
Element Analysis

Nowadays, the application of composite materials and light-weight structures is required in those industrial applications where the primary design aims are weight saving, high stiffness, corrosion resistance and vibration damping. The first goal of the study was to construct a new light-weight structure that utilizes the advantageous characteristics of Carbon Fiber Reinforced Plastic (CFRP) and Aluminum (Al) materials; furthermore, the properties of sandwich structures and cellular plates. Thus, the newly constructed structure has CFRP face sheets and Al stiffeners, which was manufactured in order to take experimental measurements. The second aim of the research was the elaboration of calculation methods for the middle deflection of the investigated sandwich-like structure and the stresses that occurred in the structural elements. The calculation methods were elaborated; furthermore, validated by experimental measurements and Finite Element analysis. The third main goal was the elaboration of a mass and cost optimization method for the investigated structure applying the Flexible Tolerance optimization method. During the optimization, seven design constraints were considered: total deflection; buckling of face sheets; web buckling in stiffeners; stress in face sheets; stress in stiffeners; eigenfrequency of the structure and constraints for the design variables. The main added values of the research are the elaboration of the calculation methods relating to the middle deflection and the occurred stresses; furthermore, elaboration of the optimization method. The primary aim of the optimization was the construction of the most light-weighted structure because the new light-weight sandwich-like structure can be utilized in many industrial applications, e.g., elements of vehicles (ship floors, airplane base-plate); transport containers; building constructions (building floors, bridge decks).

Finite Element Analysis of Axially Loaded Column Plated Column Base

2012 ◽  
Vol 166-169 ◽  
pp. 649-652
Author(s):  
Zheng Gang Fang ◽  
Ji Ping Hao ◽  
Jiao Jiao Shi ◽  
Wei Hui Zhong
Keyword(s):  
Finite Element ◽  
Effective Length ◽  
Rotational Stiffness ◽  
Finite Element Software ◽  
Effective Length Factor ◽  
Rotational Restraint ◽  
Axially Loaded ◽  
Loaded Column ◽  
Column Bases ◽  
Column Base

At present, according to Code for Design of Steel Structures（GB50017—2003）,for axially loaded column with plated column base, the column bases are considered as hinged supports, but possess actually remarkable rotational restraint. The effective length of columns can be decreased when the constraint function of plated column base is considered in calculation. The calculation of effective length factor of columns is usually according to the approximate formula which is deduced by the rotational stiffness. Axially loaded column plated column base models were established with the finite element software, the effective length factor of columns was obtained by the method which can avoid calculating rotational stiffness of plated column bases, the influence factors on the rotational restraint of axially loaded column plated column base, such as the base plate thickness, the diameter of anchors, the column section size were also analyzed in this paper.

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