S.R. Sarafrazi

S.R. Sarafrazi
University of Birjand · Department of Civil Engineering

PhD

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29
Publications
4,109
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316
Citations

Publications

Publications (29)
Conference Paper
Full-text available
As one of the most prominent kinds of green concrete, rubberized concrete utilizing waste rubbers of used tires has captured many researchers' attention in recent years. Moreover, glasses are among other waste materials, which can harm the environment. In this paper, an experimental effort was conducted to combine utilizing glass powder with rubber...
Conference Paper
Full-text available
Polyethylene Terephthalates (PETs) are a waste material that is harmful to the environment. As a result, the scientific researchers in the civil engineering field started utilizing them in concrete construction as a worldwide and long-term industry. Moreover, the waste glass resulting from industry can affect the surroundings by their destructive e...
Article
Full-text available
The high ductile of steel moment-resisting frames (SMRFs) during earthquakes has been challenged due to the brittle fractures of their welded (rigid) beam to column connections. Consequently, SMRFs have suffered severe damages and have produced collapse in main structural members (such as beams and columns). During previous years, energy dissipativ...
Article
Full-text available
The high ductile of steel moment-resisting frames (SMRFs) during earthquakes has been challenged due to the brittle fractures of their welded (rigid) beam to column connections. Consequently, SMRFs have suffered severe damages and have produced collapse in main structural members (such as beams and columns). During previous years, energy dissipativ...
Article
Full-text available
The low-cycle fatigue performance of shear panel damper (SPD) highly depends on the geometry of its shape and the criterion considered for its design. The main contribution of the current study is to find the optimum shape of the SPD subjected to cyclic loading by considering two different objective functions. The maximum equivalent plastic strain...
Article
Full-text available
The main idea of this study is to investigate and compare the efficiency of the dynamic relaxation methods (DRMs) in the form–finding of tensile membrane structures (TMSs). The form–finding process as a main stage in the design and construction of TMSs has been considered for finding an equilibrium configuration subjected to a specific pre–stress d...
Article
Full-text available
The main idea of this study is to investigate and compare the efficiency of the dynamic relaxation methods (DRMs) in the form–finding of tensile membrane structures (TMSs). The form–finding process as a main stage in the design and construction of TMSs has been considered for finding an equilibrium configuration subjected to a specific pre–stress d...
Article
It is essential to evaluate the element accuracy in the finite element method. In the common qualitative tactic, the convergence curves are usually utilized. An algorithm is proposed in this paper that grades the element using the rate, monotony, and ultimate error in addition to inaccuracy. Based on the element scores in the different tests, the a...
Article
Full-text available
Solving a system of linear or non-linear equations is required to analyze any kind of structures. There are many ways to solve a system of equations, and they can be classified as implicit and explicit techniques. The explicit methods eliminate round-off errors and use less memory. The dynamic relaxation method (DR) is one of the powerful and simpl...
Article
Full-text available
This study focuses on the efficiency and applicability of dynamic relaxation methods in form-finding of membrane structures. Membrane structures have large deformations that require complex nonlinear analysis. The first step of analysis of these structures is the form-finding process including a geometrically nonlinear analysis. Several numerical...
Article
Full-text available
This paper proposes a hybrid of topological derivative-based level set method (LSM) and isogeometric analysis (IGA) for structural topology optimization. In topology optimization a significant drawback of the conventional LSM is that it cannot create new holes in the design domain. In this study, the topological derivative approach is used to creat...
Article
Full-text available
This study focuses on the topology optimization of structures using a hybrid of level set method (LSM) incorporating sensitivity analysis and isogeometric analysis (IGA). First, the topology optimization problem is formulated using the LSM based on the shape gradient. The shape gradient easily handles boundary propagation with topological changes....
Article
Full-text available
Surface explosions resulting from terrorist attacks will produce a hemispherical shock wave in the air, which, upon release, can affect five faces of the building which is in front of it. Given the fact that conventional buildings are usually exposed to such explosions, this study examined the effect of pressure to each face of a building on the re...
Article
Twelve new and well known dynamic relaxation methods are considered. Several benchmark frame and truss structures, with geometric nonlinear behavior, are solved by these schemes. Based on the total number of iterations and overall analysis duration, the studied techniques are graded. In this way, the efficiencies of the solvers are found and these...
Article
The stability and accuracy of two families of time integration algorithms are investigated in this study. The paper has three intended goals. The first one is to find the precise properties of the implicit higher-order accuracy methods. The capabilities of the family members are found both by analytical and numerical procedures. The second goal is...
Article
The implicit higher order accuracy (IHOA) time integration family has a high order of accuracy. However, its stability domains are very restrictive. By improving the stability conditions, the larger time steps can be utilized. In this study, two parameters are introduced in the displacement and velocity extrapolations of IHOA. In order to find the...
Article
Full-text available
One of the important issues in the study of steel frames is to find a suitable formulation for semi-rigid connections. In this paper, the explicit stiffness matrix for a two-dimensional beam-column element having end-flexibilities is derived. The effects of the lateral uniformly distributed load on the deflection are considered. Both the tensile an...
Article
Full-text available
This article develops a new time integration family for second-order dynamic equations. A combination of the trapezoidal rule and higher-order Newton backward extrapolation functions are utilized in the formulation. Five members of the suggested family are extensively studied in this article. Most members of the presented time integration family ar...

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