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On the analytical model of beam-to-column semi-rigid connections, using plate theory
, Article Thin-Walled Structures ; Volume 39, Issue 4 , 2001 , Pages 307-325 ; 02638231 (ISSN) ; Ghorbani Asl, M ; McCabe, S. L ; Sharif University of Technology
2001
Abstract
An analytical method is presented that can be used to determine the behavior of a particular steel beam-to-column extended end plate connection, in both linear and non-linear regions. This article demonstrates a closed form solution of the equations of deformation, for this type of connection. Besides, a step-by-step analytical procedure for establishment of the linear part of M-θ curve of this form of connection is developed. However, this technique can properly be extended to the non-linear regions, which is not considered in this article. The correctness of the results has been ascertained by a comparison, using non-linear finite element models as well as experimental approach; and very...
On the analytical model of semi-hinged steel connections, using plate theory
, Article Thin-Walled Structures ; Volume 40, Issue 6 , 2002 , Pages 487-501 ; 02638231 (ISSN) ; Azizpour, S ; McCabe, S. L ; Sharif University of Technology
2002
Abstract
An analytical method is presented that can be used to determine the behavior of a particular steel beam-to-column top and seat angle connection with double web angles. This article demonstrates a closed form solution of the equations of deformation, for this type of connection. Besides, a step-by-step analytical procedure for establishment of the linear part of M-θ curve of this form of connection is developed. However, this technique can properly be extended to the non-linear regions, which is not considered in this article. The correctness of the results has been ascertained by a comparison, using experimental approach as well as different analytical technique; and very good agreement has...
Gusset Plate Connectionmodels
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
Lateral forces on structures are transferred to braces as tensile and compressive loads. These loads enter the beams and columns through the gusset plates. The gusset connections to the beams and columns must be such that they be able to pass the loads through themselves. So far, five analytical models have been proposed for this connection and only one of them is recommended by AISC. These models estimate the existing forces and moments on the connection. The analytical models are: model 1 (KISS), model 2 (2A-AISC), model 3 (Thornton), model 4 (Ricker) and model 5 (Richard). Among these models, only model 3 is recommended by AISC because the others are more conservative. It should be noted...
Plastic Analysis of Steel Grillages Considering Bending-Tortion Iteraction
, M.Sc. Thesis Sharif University of Technology ; Kazemi, Mohammad Taghi (Supervisor)
Abstract
Grillage structures are used at roofs of some buildings and community halls and shopping centers and airports, or structures that used as bowers. The grillages is constructed with steel or concrete beams. In most of the carried out Researchs the twisting effect on these structures has been ignored. In this research the behavior of such structures with considering regulation and softwares limits by some simple programable assumptions is simulated. So with using MATLAB software a program extracted for grillages nonlinear analysis and its results was compared with common engineering software. In This approach in addition to pure bending, bending – torsion interaction is considered too and I...
A New, replaceable Steel Connection with High Energy Absorbing Capacity
, M.Sc. Thesis Sharif University of Technology ; Khansari, Vahid (Supervisor)Analyzing and Modeling of Novel Semi- fixed Beam to Column Connections in Steel Structures
, M.Sc. Thesis Sharif University of Technology ; Mofid, Massoud (Supervisor)
Abstract
The flexibility of beam to column connections and its effect on behavior of steel structures is one of the most important problems, which is interesting to engineers and scientists for more than 80 years. Hence many studies conducted on this topic to clarify the behavior of this type of connection. In this work, it is tried to study the behavior of double plate connections, which are welded to the beam web by finite element modeling and mathematical method. A novelty of this thesis is some top trough plate which has been implemented to column under beam flange. Based on finding of this thesis few recommendation can be made related to usage of top trough plate. In brief reduction of...
Assessment of the semi-rigid double-angle steel connections and parametric analyses on their initial stiness using FEM
, Article Scientia Iranica ; Volume 22, Issue 6 , 2015 , Pages 2033-2045 ; 10263098 (ISSN) ; Mohamadi Shooreh, M. R ; Mod, M ; Sharif University of Technology
Abstract
In this paper, the semi-rigid connections, such as Double-angle Web (DW) connections, which are welded to the beam web and bolted to the column ange, are investigated. This study tries to establish the eect of clearance setback between beam end and column ange and/or web. When the beam rotates, it is desirable to avoid bottom ange of the beam bearing against the column as this can induce large forces on the connection. The usual way of achieving this is to ensure that the connection extends at least a few millimeters beyond the end of beam. For this purpose, several connections are designed and considered based on two dierent shear capacities for the beam. For each connection, two dierent...
Scrutiny of a Semi-rigid End-plate Splice Connection under Monotonic and Cyclic Loading
, M.Sc. Thesis Sharif University of Technology ; Mofid, Masood (Supervisor)
Abstract
Existing design methods for steel frames has been improved over the last three decades in order to incorporate the behavior of semi-rigid steel connections in furtherance of frame design and since the analysis and design of structures is often done based on the assumption of completely rigid or pinned behavior,therefore, the actual behavior of connections and their modeling can help to understand the actual behavior of structures.Knowledge of the initial rotational stiffness of the connection is important for elastic analysis of structures. Investigations show that structures with semi-rigid connections have many features which are the causes to prefer these kinds of connections to the...
Control of Base Metal Capacity of Welded Connections under Multiaxial Loading
, M.Sc. Thesis Sharif University of Technology ; Maleki, Shervin (Supervisor)
Abstract
Block shear failure in the parent material is considered as a common potential failure mode in welded connections used in steel structures. However, there is only little research reported on the block shear failure of welded connections under multiaxial loading. Multiaxial loading is defined as loading not parallel or perpendicular to weld lines and in the case of in planar eccentricity results in torsional loads. In this research a nonlinear finite element model is developed to study the effect of connection geometry, weld group configuration, and eccentricity of lap splice connection on block shear capacity. The case studied concerns a 3 milimeter thick structural steel plate (CSA G40.21...
Investigation and Modeling of a New type of Semi-Rigid, Steel Beam-Column Connection under Monotonic Loading
, M.Sc. Thesis Sharif University of Technology ; Mofid, Massoud (Supervisor)
Abstract
This thesis presents the investigation and development of a Finite Element Model (FEM) for a new type of Beam-Column Semi-Rigid steel connection. One of the main parts of this connection is a steel T profile inserted on top of a beam connecting it to a column by bolts. It seems that changes in the geometry of the T profile and its bolt positions can have a great influence on the rigidity or flexibility of the connection. Therefore, meaningful categories of the T profile geometry with different bolt positions have been modeled and analyzed by means of a Finite Element Modeling software ABAQUS, and their moment-rotation curves were driven. Also the Initial and Nonlinear Stiffness and the...
Investigation of Steel Plate Shear Wall Behavior with Shape Memory Alloy Connection
, M.Sc. Thesis Sharif University of Technology ; Mofid, Masoud (Supervisor) ; Mohtasham Dolatshahi, Kiarash (Co-Advisor)
Abstract
In recent decades, restoring residual deformations and adding the capability of returning to initial deformed state was investigated by many researchers. Steel Plate Shear Wall (SPSW) is one of structural earthquake resisting system that have high ductility capacity and good energy absorption property. On of major issues in SPSW systems is intense nonlinear deformation in panel’s infill web plate and this panels vertical and horizontal boundary elements. By incorporating Shape Memory Alloy (SMA) connections we can add returning to first deformed condition (self-centering) and sustain high ductility capacity to many structures. In this research the addition of SMA connections to SPSW system...
Block shear failure in welded gusset plates under combined loading
, Article Journal of Constructional Steel Research ; Volume 170 , July , 2020 ; Ghaderi Garekani, M ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Block shear failure in the base metal of welded steel connections is a potential failure mode affecting many steel structures. However, there are only a few studies on the block shear failure of welded connections under combined shear and axial loading. Combined loading is defined as a simultaneous loading parallel and perpendicular to the weld lines (or an inclined loading) in the plane of the connecting plate. In this research, a nonlinear finite element model is used to study the effect of connection geometry and weld group configuration on the block shear strength of welded connections under combined loading. In current design standards, the block shear failure planes are assumed to...
A study on microstructural changes and mechanical properties in steel rods subjected to uniform and non-uniform cooling layout using a finite element analysis
, Article Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture ; Volume 222, Issue 12 , 2008 , Pages 1639-1649 ; 09544054 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
2008
Abstract
This paper presents a mathematical model for prediction of temperature history, final microstructures, and transformation kinetics in steel rods subjected to non-uniform cooling conditions. To achieve this goal, a mathematical model based on two-dimensional finite element method is developed to solve the governing heat conduction equation with non-uniform boundary conditions. The additivity rule is coupled with the finite element analysis to assess the kinetics of austenite decomposition during continuous cooling. The effect of decarburization during heating stage is also considered in the model employing Fick's second equation. To verify the predictions, time-temperature histories during...