Mojtaba Labibzadeh

Mojtaba Labibzadeh
Shahid Chamran University of Ahvaz | scu · Faculty of Civil Engineering and Architecture (Ahvaz)

PhD

About

52
Publications
13,702
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238
Citations
Citations since 2016
26 Research Items
163 Citations
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530
2016201720182019202020212022051015202530

Publications

Publications (52)
Article
Preventing damages and reducing the consequences of natural disasters such as earthquakes are nowadays considered as the most important considerations in improving the existing structures or designing new ones. A steel plate shear wall (SPSW) is one of the systems that resist lateral loads. Despite its significant benefits such as load capacity, pl...
Article
In this work, the parametric study is performed on the numerical models of one-storey and four-storey composite shear walls that are made in real dimensions. In this regard, the structural performance of double skin composite shear walls (DSCSW) and Reinforced DSCSW (RDSCSW) under monotonic/cyclic loading are examined and their behavior are compare...
Article
Purpose This study aims to investigate the effects of using circular spirals as the longitudinal reinforcing bars on the performance of the concrete beams subjected to four-point bending load. Design/methodology/approach The effects of using circular spirals as the longitudinal reinforcing bars on the performance of the concrete beams subjected to...
Article
Steel plate shear in combination with X-shaped restrainers (XSPSW) is one of the new structural systems considered to resist earthquakes and that has better a hysteretic behavior than a simple plate shear wall. In this work, the two-story frame with three openings equipped with a novel XSPSW and USPSW system is subjected to cyclic and real earthqua...
Article
Purpose This paper aims to study, the effects of opening shape, size and position as well as the aspect (height-to-length) ratio on the shear capacity, stiffness, ductility and energy dissipation capacity of triple-skin profiled steel-concrete composite shear wall (TSCSW) and investigate and compare them to those of concrete-stiffened steel plate s...
Article
This paper presents three-dimensional (3D) nonlinear finite element analyses of pile foundations in saturated sand deposits subjected to submerged explosions. In this contribution, the explosive response and failure analysis of reinforced concrete piled foundations and blast induced wave propagation are investigated. The arbitrary Lagrangian-Euleri...
Article
The behavior of three various types of steel plate shear walls includes flat, trapezoidal, and sinusoidal is compared to each other under the same quasi-static cyclic loading protocol using the ABAQUS finite element software package. To verify the numerical method, the results obtained from the two numerical models are compared to the corresponding...
Article
The performance of a new type of concrete columns reinforced with multi-tied spiral transverse reinforcements called MTSTR columns has not yet been investigated and compared with other types of columns under eccentric loads. In this regard, three types of concrete columns, concrete-filled steel tube column (CFST), traditional concrete column (TCC)...
Article
Full-text available
This paper presents the applicability of Reduced Length Buckling-Restrained Braces (RLBRBs) in combination with strut elements in deep excavations. Strut members are used as part of the lateral load resisting system. By proposing a new type of RLBRB section, the advantages of RLBRBs are demonstrated in dynamic soft soil-structure interactions. A nu...
Article
This paper is the first to present the results of a numerical comparison between the performances of two newly developed concrete columns namely: multi-tied spiral transverse reinforced (MTSTR) column and concrete-filled steel tube (CFST) column under eccentric compressive loads. The behavior of MTSTR columns under eccentric loads has not been stud...
Article
This study was designed to find an analytical formula for predicting the ultimate shear strength of a novel kind of complex steel-concrete shear walls known as double steel plate complex shear wall (DSCSW). The performance of these compound walls is now under research and no adequate design provisions are available. Three types of analytical formul...
Article
In this study, it was attempted to investigate the efficiency of a new type of composite shear walls named as Double Skin profiled Composite Shear walls (DSCSWs) in practice. To this end, 22 Finite Elements (FE) models of DSCSWs with practical geometries have been modeled using ABAQUS/CAE/Explicit v.6.14. These models were developed based on an enh...
Article
Full-text available
In the present study, a new technique in Discrete Least Squares Meshless method; DLSM; has been adopted for stress assessment of two-dimensional elastic domains including a non-growing crack. DLSM is a real meshless method that does not require mesh both in approximation step and in numerical integration step of the solution procedure due to the us...
Article
Full-text available
In this research, the trends of degradation of stiffness and compressive strength of mass concrete of the Dez concrete arch dam, over time have been evaluated using a new and robust method. In previous studies of the corresponding author, he was successful to estimate the degradation of the stiffness of dam’s concrete at the end of a selected time...
Article
Full-text available
The main purpose of this study is to investigate the effects of the stress path, size and shape of the specimen, on the optimum values of the plastic input parameters of Concrete Damaged Plasticity-CDP-model of the ABAQUS software. This study concentrates on eccentricity, dilatation angle and viscosity input parameters. To finding optimum values of...
Article
Full-text available
Purpose The purpose of this paper is to present a new method for determining the input parameters of the concrete damaged plasticity (CDP) model of ABAQUS standard software. The existing available methods in the literatures are case sensitive, i.e., they give different input parameters of CDP for a unique concrete class used in different finite el...
Conference Paper
Full-text available
This paper is investigating the effect of element type used for finite element modeling of behavior of reinforced concrete beam subjected to four-point bending test. To this end two finite element (FE) models were simulated by the ABAQUS standard software. The only difference between these two FE models was the selection the element type to the rei...
Conference Paper
Full-text available
this study deals with the effect of the stress paths on the optimum values of the input parameters of a sophisticated material model for concrete in the ABAQUS standard software. This material model is Concrete Damaged Plasticity or in abbreviated form as CDP model. CDP model's input parameters are categorized into three parts: elastic, plastic and...
Conference Paper
Full-text available
Keywords: Concrete Damage Plasticity, size effects, three point bending test, ABAQUS-Introduction Concrete is a complicated material to be modelled within finite element packages. A proper material model in finite element model should inevitably be capable of representing both elastic and plastic behavior of concrete in compression and tension. The...
Article
Full-text available
A new approach in meshless methods has been introduced for stress assessment around a crack in two-dimensional elastic solids. This method with the name VDLSM (Voronoi Based Discrete Least Squares Meshless) is a pure meshless method which does not implement nodal mesh for trial and test functions. Rather, it uses a collection of the scattered nodal...
Article
Full-text available
In the present study, the author's previously developed micro-planes concrete damage model has been implemented in the Discrete Least Squares Meshless method (DLSM) for assessment of the crack performance in concrete domains. DLSM is a true meshless method needing no partition in the local approximation as well as in the assembling of the local app...
Article
Full-text available
In this paper, an assumption used in the recent work of the author and his contributors considers the long-term concrete damage of the Dez arch dam as a homogeneous and isotropic process, was investigated in more detail and was adjusted. To this end, the vertical dam sections were divided into nine and six subsections along the thickness and height...
Article
Full-text available
A new technique is used in Discrete Least Square Meshfree(DLSM) method to remove the common existing deficiencies of meshfree methods in handling of the problems containing cracks or concave boundaries. An enhanced Discrete Least Squares Meshless method named as VDLSM(Voronoi based Discrete Least Squares Meshless) is developed in order to solve the...
Article
Full-text available
In this research, the effect of the lateral and corner openings as well as the impact of using a kind of FRP sheets known as Carbon Fibre-Reinforced Polymer sheets (CFRPs) as a retrofitting approach on the RC two-way slabs' bearing capacity was investigated. To this end, at first, an enhanced finite-element (FE) model of an actual laboratory sample...
Article
Full-text available
In this study, an enhanced finite element (FE) model enriched with a concrete constitutive material formulation was developed for investigating the effects of CFRPs (carbon fiber reinforced polymers) on the retrofitting of reinforced concrete (RC) two-way slabs with lateral and corner openings. For concrete behavior simulation, a sophisticated mate...
Article
Full-text available
The effects of the lateral and corner openings as well as the impact of using carbon fibre reinforced polymer sheets (CFRPs) on the RC two-way slabs' bearing capacity were investigated. To this end, at first, an enhanced finite element model of an actual laboratory sample of a reinforced concrete slab with central opening was simulated and verified...
Article
Full-text available
For programming and management of water resources, access to hydrometric data is necessary. Unfortunately, the quantity and quality of hydrometric data are not suitable in developing countries. These data can not show drought periods and wet periods correctly. Prediction of wet periods is an important problem for flood control while forecasting of...
Article
Full-text available
For supplying of water demands in the downstream of dams, optimization of released water from reservoir of dam is necessary. Released water from reservoir is related to discharge of inflow to reservoir, volume of evaporation from reservoir and storage of reservoir. Water demands are includes of drinkable water and agricultural water demand. If rele...
Article
Determination of water surface elevation in tidal rivers is a very complex problem. In these rivers, two phenomena are effective (fluvial flows at the upstream of them and tidal height at the downstream of them). Because of independency of these phenomena, combination of their return period needs a suitable theory. Joint probability method is a the...
Article
Full-text available
A computational model simulating the behavior of the concrete subjected to the high temperature environment has been presented here by means of micro-planes framework. The constitutive equations using damage formulations developed earlier by (Labibzadeh and Sadrnejad, 2006) have been adapted here to account for the effects of elevated temperatures....
Article
Full-text available
Karun-1dam safety was examined through carrying over a 3D finite elements analysis. The dam as well as its foundation and abutments have been modeled in a relatively exact manner. Furthermore, the vertical contraction joints were simulated in calculations. Hydrostatic, gravity and thermal effects have been taken into account as the load collections...
Article
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In recent years, the material behavior dependence of laboratory concrete specimens built with the same concrete mixture under the same load conditions to their geometrical sizes is wellestablished. This phenomenon which is observed not only in concrete but also in most quasi-brittle materials such as rock, ceramic or composite materials is now call...
Article
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Among the various numerical simulating models of plane concrete, the micro-planes models have an excellent position. These models are not as complicated as microscopic models such as discrete particles models and do not have the shortcomings of macroscopic models based on the stress or strain invariants. The object of this study is the application...
Article
Full-text available
The constitutive equations for the mechanical behavior of concrete capable of seeingdamage effects or crack growth procedure under loading/unloading/reloading was developed uponmicroplane framework. The proposed damage formulation has been built on the basis of fivefundamental types of stress/strain combinations, which essentially may occur on any...
Article
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The analysis of large structures mostly requires a complete three dimensional finite elementdiscretization. Stability of such structures includes not only the stability of structure itself but also thatof foundation as well as interconnection elements. The general instability of a structure may be affectedby two aspects, firstly, an inappropriate p...
Article
Full-text available
A recently new developed set of constitutive equations which simulating the mechanical behavior of plane concrete have been implemented for monitoring the probability of cracking phenomenon within an arch concrete dam . The applied constitutive model was build on the basis of combination of micro-plane theory and damage framework. This model had be...
Article
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Sugar cane had been one of the most important agricultural products in the province of Khuzestan in Iran Country. Because of that since a long time ago this region has been called "The sugar Cane Region" or "Khoozestan ". In the process of sugar cane refinery, yellow fibers called Bagasse are generated which are known as the wastes of this product....
Article
Full-text available
One of the phenomena observed during strong earthquakes is the pounding of adjacent buildings which has been known as the pounding in dynamic of structures science. This pounding sometimes can lead to significant pounding forces which ultimately resulted into the destruction of adjacent buildings. Various methods for prevention against to the pound...
Article
Full-text available
Dez dam stability was examined due to unexpected decrease in its reservoir level by performing a 3D finite elements analysis. The dam as well as its foundation and abutments have been modeled in a relatively exact manner. Moreover, the vertical contraction joints were simulated in the analysis. Hydrostatic, gravity and thermal forces have been take...

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