Ali Kheyroddin

Ali Kheyroddin
Semnan University · Department of Structural Engineering

Distinguished Professor of Structural Engineeing

About

442
Publications
159,506
Reads
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4,711
Citations
Introduction
Ali Kheyroddin obtained his PhD degree from McGill University, Canada at 1996. Currently, he is a professor of Structural Engineering in Semnan University, Iran, and he is also the member of Center of Excellence for Engineering and Management of Civil Infrastructures, University of Tehran, Iran. He was an invited visiting scholar in the University of Texas at Arlington, USA (2015), and he was the chancellor of the Semnan University for 8 years. His research interests include design of RC structures, tall buildings, rehabilitation of existing buildings and design of earthquake resistant buildings. He is the author of ten books, more than 180 ISI and ISC journal papers, and more than 370 conference papers. He is also Editor in Chief of Journal of Rehabilitation in Civil Engineering.
Additional affiliations
January 1991 - June 2016
Visiting Scholar at the University of Texas at Arlington, Texas, USA, & Semnan University
Position
  • Professor (Full)
August 1989 - January 2015
Semnan University
Position
  • Reinforced concrete, Tall building, Earthquake engineering,Rehabilitation of structures
August 1989 - January 2015
Semnan University
Position
  • Reinforced Concrete, Tall Buildings, FEM, Earthquake Engineering

Publications

Publications (442)
Article
The Externally Bonded Reinforcement on Grooves (EBROG) method represents an advancement in externally bonded reinforcement (EBR) techniques, specifically addressing the challenge of premature debonding often encountered in conventional Fiber Reinforced Polymer (FRP) applications directly bonded to concrete. This article introduces a novel and strai...
Article
Nowadays, the helipad is considered on the roofs of tall buildings to accommodate air taxi services or evacuation in case of a major fire outbreak. On the other hand, lateral load systems play an essential role in tall buildings. In tall buildings, the reinforced concrete end shear walls connect the ends of two reinforced concrete shear walls in al...
Article
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This study aimed to rigorously evaluate the impact of tuned mass dampers (TMDs) on structural response under seismic excitation. By strategically placing TMDs at various levels within the structures, the research sought to determine their effectiveness in mitigating structural movement. A single-degree-of-freedom (SDOF) system incorporating TMDs wa...
Presentation
Full-text available
Nowadays, many factors affect the design process of tall buildings. Therefore, the architectural concept sometimes causes irregular plans, complex forms, and structural design challenges. On the other hand, lateral loads have more critical effects on lateral load resistance systems. In all stories, the end shear wall was used for the lateral load s...
Presentation
Full-text available
According to architectural and economic requirements, tall buildings are designed in different forms. On the other hand, the non-uniform, irregular, and complex forms cause some challenges in structural designs, especially in lateral load resistance systems. In this regard, the end shear wall was utilized for the lateral load system. The end shear...
Article
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The concurrent utilization of both concrete and steel stories within buildings results in the establishment of a hybrid lateral load-resistant system throughout its height. Different seismic codes do not provide specific values for the seismic factors to be used in the design of mixed concrete/steel buildings. Through these parameters, the nonlinea...
Article
This study aimed to evaluate the behavior of the end shear wall under earthquake excitations, considering its chaotic behavior in the structure. The end shear wall decreased tensions and improved structural performance in lateral excitations of tall buildings by connecting the end of shear walls in all stories due to more tensions at the end flange...
Article
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This study aims to explore the optimal strut-and-tie-model (STM) for strengthening reinforced concrete (RC) corbels with carbon fiber-reinforced polymer (CFRP), utilizing finite element (FE) analysis. While previous studies have only examined a single type of FRP sheet arrangement, this research fills a gap by investigating the effect of four confi...
Article
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Reinforced concrete slabs are often subjected to impact loads. Due to a relatively low tensile strength and energy dissipating characteristics, the impact resistance of slabs is considered poor. In this paper, reinforced concrete one-way slabs are prepared and experimentally investigated under impact loading. Since failure in slabs under impact loa...
Article
Lateral load resistance systems are among the essential issues, which have various types in reinforced concrete tall buildings. The end shear wall is used to decline tensions and improve shear wall performance in tall buildings by connecting the end of shear walls in all stories due to more tensions in the end flanges of shear walls. Therefore, thi...
Article
The recent earthquakes in Afghanistan, Turkey, Syria, and most regions of the world show buildings inadequacy in bearing the earthquakes forces. Knowing the performance of hospital systems earthquakes is important. Seismic vulnerability assessment estimates the amount and probability of damage to buildings under an earthquake's possible effects. Th...
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The purpose of this study is to use multivariate adaptive regression spline (MARS) and extreme learning machine (ELM) artificial intelligence models to estimate the compressive strength of the circular concrete columns wrapped with FRP sheets. In addition, to improve the accuracy of these models, the particle swarm optimization (PSO) algorithm was...
Article
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The lack of adequate space for sewage sludge disposal has become a significant challenge in many countries. Landfilling and using sewage sludge as fertilizer in agricultural lands are the main methods for disposal. However, these methods can result in soil and groundwater contamination as well as heavy metal and microbial pollution in soil. An alte...
Article
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In this essay, the progressive collapse resistance of the reinforced concrete wall-frame structures was evaluated with and without considering the soil–structure interaction. The vulnerability of the frames against progressive collapse was investigated with the middle column removal scenario from the first story, based on the sensitivity index. To...
Article
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A critical zone is formed at the junction of the lower concrete and upper steel sections in mixed concrete/steel structures in terms of gravity and lateral loads caused by the support reactions of the steel frame. There are two common approaches to transition from concrete section to steel one in this critical zone: the first is the direct pin conn...
Article
Many parameters affect the behavior of tall buildings under seismic loads, some of which are the main shock-after shock records and using some lateral load resistance systems in reinforced concrete tall buildings. End shear walls are a kind of shear walls, connecting their end in tall buildings. This study was conducted on two 30-story reinforced c...
Article
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The application of fiber-reinforced polymer bars is rapidly rising in concrete structures because of corrosion resistance and high tensile strength. By contrast, concrete structures reinforced with Fiber-Reinforced Polymer (FRP) bars illustrate less ductility and brittle failure without warning than reinforced concrete structures with conventional...
Article
The HPFRCC is defined by a stress-strain response in tension, which demonstrates multiple cracking and strain-hardening behavior. This experimental study aims to investigate the splitting tensile strength (STS), compressive strength (CS), and bulk density (BD) of HPFRCC. The CS of concrete should provide an accurate basis for the STS prediction. Th...
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The main objective of this study is to investigate the structural performance of reinforced concrete (RC) beam specimens strengthened with 3D-fiberglass as compared with fiber-reinforced polymers (FRP) sheets. For this purpose, six RC beams were fabricated, strengthened, and tested under a four-point bending machine. One of the beams served as the...
Article
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In this essay, to investigate the progressive collapse of the reinforced concrete (RC) frames, a nonlinear static pushdown analysis was performed with column removal scenarios from the first story. At first, a numerical model was simulated and verified with the experimental model in SeismoStruct software without soil–structure interaction (SSI). Af...
Article
This experimental study is focused on the cement mortar (CM) specimens containing the quartz grains (QG) and natural zeolite (NZ), exposed to the magnetic field (MF) with densities of 0, 0.3, and 0.5 Tesla (T) to investigate the mechanical and microstructural properties using the compressive and bending strength tests as well as the scanning electr...
Article
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Shear wall is one of the common lateral bracing systems in reinforced concrete structures. A coupling beam can be used due to architectural limitations for connecting two or multiple separate walls. Coupling beams are the most vulnerable elements of coupled shear wall systems. Therefore, beams could be designed to act as replaceable fuses in the sy...
Article
To date, no research attempts have been made to evaluate rate of axial load in columns changed due to vertical component of earthquake or increase in vertical distributed loads on the load-resisting bay due to the change of use of the building. Accordingly, this study is intended to investigate the effect of rise in these two parameters on general...
Article
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A building that contains two different lateral resisting systems in its height exampling a Reinforced Concrete (RC) moment frame for the lower and a steel moment frame for the upper floors, respectively is called a mixed concrete/steel building. At the intersection of the two parts of RC and steel, there is a floor called a transition story made of...
Chapter
In this study, the seismic and static performance of post-installed anchors (bars) using chemical bonding (epoxy adhesive mortar) in cracked and uncracked reinforced concrete was analyzed using Hilti International software (Hilti PROFIS Anchor soft.). For this purpose, 52 concrete specimens with different anchor diameters, bar installation depth, a...
Article
Full-text available
A building that contains two different lateral resisting systems in its height exampling a Reinforced Concrete (RC) moment frame for the lower and a steel moment frame for the upper floors, respectively is called a mixed concrete/steel building. At the intersection of the two parts of RC and steel, there is a floor called a transition story made of...
Article
Full-text available
Lateral bearing systems affect tall structures’ behavior against lateral forces. Shear walls are one of the influential structural members against lateral forces. However, the ends of shear walls undergo severe stress under lateral forces connected to a reinforced concrete shear wall called end shear wall to improve the end structure behavior of th...
Article
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Concrete and cementitious composites have far been the main and most widely used construction materials throughout the world due to their outstanding features, such as high structural properties, accessibility and relatively low production costs. However, these materials are prone to degradation caused either by automatic cracking or external excit...
Article
In the present study, four set of full scale specimens have been cast to investigate the effects of handmade GFRP shear bands on punching behavior of single footings. To do so, the specimens’ reinforcement was designed so that the punching failure governed. Besides, two types of concrete mixture, i.e. normal concrete (NC) and self-compacting lightw...
Article
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strength steel effects on the behavior of special shear walls. Magazine of Civil Engineering Abstract. In this research, the effects of applying high-strength steel (HSS) bars as horizontal and vertical bars of the web, and as the flexural and shear bars of the boundary elements on the behavior (load-displacement and maximum moment) of shear walls,...
Article
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Development of technology facilitates construction of tall buildings. One of the common kinds of them is Tubular systems, divided into different types: framed tube, tube-in-tube, trussed tube and bundled tube systems. The main problem of tubular systems is the shear lag phenomenon that decreases the bending rigidity and moment resistance of the...
Article
Viscous dampers (VDs) are currently used an effective earthquake risk reduction measure. Due to the high cost of this type of dampers, an optimal damper layout across the stories will specifically improve the seismic response and reduce building costs. This paper introduces a new simple three-stage method to determine the optimal placement of VDs o...
Article
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In this study, the effect of middle, side and corner openings on the reinforced concrete two-way slabs was investigated. Three reinforced concrete slabs with dimensions of 1500 × 1500 × 120 mm are physically prepared and then experimentally and numerically investigated using finite element analysis under vertical monotonic loading. In each specimen...
Article
Seismic response of Reinforced Concrete (RC) beam-column joints has always been evaluated by researchers due to their undeniable influence on the overall behavior of RC building frames under seismic loads. In the present study, an attempt has been made to predict displacement ductility ratio of RC joints using machine learning- (Artificial Neural N...
Article
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In the recent decades, researchers have shown an increased interest in the reusing recycled concrete aggregate generated by buildings’ demolitions because of the undeniable economic and environmental benefits. The main objective of this research is therefore to evaluate the influence of replacing natural fine and coarse aggregate on the 3-, 7- and...
Article
Mechanical properties of steel reinforcement bars, which have a critical effect in the overall performance of reinforced concrete (RC) structures, should be reported and assessed before being used in structural elements. Determining bars’ properties could be time-consuming and expensive specifically in the case of incorporating splices. Therefore,...
Article
This paper investigated the cyclic performance of arched steel haunches as a new strategy in the seismic retrofitting of reinforced concrete frames and focused on the slenderness ratio effect. A series of cyclic loading were conducted on six test specimens in two groups with the same nominal length and different axial eccentricities of 0.1 and 0.2...
Article
In the past few decades, multi-story X-braced frames have frequently been used to retrofit RC buildings and have become the subject of more attention and implementation to improve the stiffness and strength of structures. In this study, a comprehensive series of inelastic analyses were undertaken to better understand the nonlinear behavior of reinf...
Article
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The construction demand for irregular structures is increasing due to the population growth of cities, limited construction areas, and the aesthetics of structures. Lack of proper understanding on the dynamic behavior of these structures during seismic events can lead to local and global failures on them. In order to investigate this issue, we used...
Article
Bar splice methods have always been studied and discussed by structural engineers due to their crucial influence on the seismic performance of RC elements and structures. In the recent decades, extensive researches have been conducted on the investigation of different splice methods such as lap, mechanical and welded splices incorporated in structu...
Article
This paper introduces arched steel haunches (ASHs) as a novel technique in the seismic retrofitting of RC frames. In this regard, parameters such as ASH initial eccentricity and width-to-thickness ratio are evaluated as two factors affecting on their cyclic behavior. A series of cyclic loading tests were performed on four specimens with single and...
Article
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It has been used to preserve structures and extend their useful life, retrofit damaged structures. Concrete slabs, as a key structural member, play an important role in the load distribution and structural behavior, and lack of resolving the damage to concrete slabs can lead to irreparable damage. In this experimental study, the one way reinforced...
Article
Shape memory materials (SMMs) are an important group of intelligent multifunctional materials used in civil engineering applications whose popularity is due to their unique capability to memorize their original shape. After deformation they can return to their initial shape under stimuli, e.g. heat. SMMs are classified into four categories: shape m...
Article
Reinforcement ratio and bar splice methods have an indubitable effect on the behavior of RC beam-column joints. The present experimental study is focused on evaluating the influence of parameters including reinforcement ratio of beams, method and number of splices on the performance of RC beam-column joints under dynamic loads. To aim this goal, fo...
Article
Full-text available
Owing to their excellent stiffness, reinforced concrete shear walls, as lateral load-bearing elements, considerably reduce the structure's seismic demand. Structural walls are designer-favorite components for their excellent stiffness and rigidity under lateral loading. Unlike steel chevron braces that buckle after a few loading cycles, shear walls...
Article
In this study, the cyclic performance of innovative less-invasive haunches, as fuse elements, called Arched Steel Haunches (ASHs) for seismic retrofitting of reinforced concrete frames was investigated. The axes of these haunches are like circle arcs, which are more geometrically compatible with architecture than straight haunches. Two physical mod...
Article
Reinforced concrete beam-column joints play a key role in transferring gravity and lateral loads from beam to column. One of the main failures of the RC joints is shear failure due to a lack of transverse reinforcements and full unconfinement in this area. In this study, steel angles and external diagonal post-tensioned bolts have been presented as...
Article
Substitution of only steel rebar with fiber-reinforced polymer (FRP) or in combination with steel rebar has been recommended to reduce corrosion effects in steel rebar. This paper has pursued the impact of hybrid concrete beams reinforced with High Strength Steel Bars (HSS) and Glass Fiber-Reinforced Polymer Bars (GFRP) manufactured employing High-...
Article
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The present study was an attempt to investigate the effect of direct and uniform magnetic field on concrete-steel rebar bond strength in fresh and hardened concrete specimens containing quartz aggregates using pull-out test. Moreover, compressive strength test was performed on all magnetic and non-magnetic specimens at 28 days of concrete age in or...
Article
Even small torsional moments can produce significant stress in beams and alter the behavior of the entire structure. Although many studies on the torsional behavior of reinforced concrete (RC) beams strengthened with fiber-reinforced polymer (FRP) sheets, there are still some uncertainties regarding the behavior of these beams under combined torsio...
Article
In this article, the outcomes from an experiential program aimed at investigating the effect of high- performance fiber reinforced cementitious composite (HPFRCC) layers and stirrups distance on flexural performance, ductility, moment redistribution, and plastic hinge length of two-span continuous concrete beams. The unique characteristics of reinf...
Article
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Reductions in materials consumption through the use of high-strength materials is important in building construction. However, high-strength steel applications have possible challenges such as their effects on bond behaviour and structural ductility. The bond behaviour, total energy capacity and failure modes of headed and straight high-strength an...
Article
Non-ductile reinforced concrete frames are commonly found in older buildings in many parts of the world. These structures designed for gravity loads, have limited lateral strength and ductility, are prone to excessive one-way lateral movement and soft-story mechanism. This paper focuses on the retrofit of an existing reinforced concrete frame, usin...
Article
Bar splices play an important role on the performance of RC structures by transferring loads from one bar to another. Therefore, applying an appropriate method to achieve satisfactory stress transmission has become a major concern for structural designers. In the present study, the application of lap and forging splice methods in RC columns is eval...
Article
In this paper, seven beams were reinforced with the steel and Glass Fiber Reinforced Polymer (GFRP) bars in a hybrid system and the experimental behavior of beams was investigated. Three groups of beams were reinforced, including only-GFRP, only-steel, and hybrid steel-GFRP rebar subjected to four-point bending tests, respectively. To enhance the d...
Article
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Fiber-reinforced concrete (FRC), which has become quite popular in recent years, improves many of concrete's mechanical properties. It uses fibers discretely and is utilized in different structures. This paper proposes, between steel fibers and concrete, a fiber interfacial transition zone (FITZ) which is the most vulnerable part of steel FRC (SFRC...
Article
باتوجه به اهميت پل ها به عنوان شريان هاي حياتي و لزوم خدمت رساني آن ها بعد از وقوع زلزله، طراحي مناسب اين دست سازه ها امري مهم مي باشد. در همين راستا يك گام مهم براي پيش بيني عملكرد اين نوع سيستم هاي سازه اي تحت شرايط مختلف بارگذاري، تعيين محل پاسخ غير ارتجاعي مي باشد. در پايه پل ها، اين تغيير شكل هاي غير ارتجاعي عمدتا در طولي محدود به نام مفصل پلا...
Article
Full-text available
Residential buildings consume a major portion of energy resources and hence are seriously involved in environmental pollution. In Iran, fossil fuel consumption is growing, such that it increased by more than 400% from 1990 to 2018. One of the fundamental solutions for reducing fossil fuel consumption and creating a healthy environment inside and ou...
Article
Full-text available
In the current study, the influence of beam and column dimensions on the seismic response of joints is numerically evaluated by changing beam and column dimensions in ABAQUS. Three wide column-beam joints were modeled and verified using the experimental studies available in the literature. Dimensions of verified models were then changed to evaluate...
Article
Full-text available
The Linked Column Frame (LCF) system consists of the main lateral load bearing system of the structure called the Linked Column (LC) frame; the structural system is Moment Resisting (MF) frame acts as gravity load bearing system. This system can use to retrofit the reinforced concrete (RC) or steel frame. This paper presents the results of an exper...
Article
Deep beams are generally used as main load-bearing beams or pile caps which are very common in high rise buildings. The span to height ratio of beams is an essential parameter in their flexural and shear behaviors. The usage of composite concretes conjuncture with fibers enhances the deep beams to overcome the relative brittleness and fragility of...
Article
One of the essential points of interest for designers in constructing the tall building is to create a large entrance to the lower floors of the building. Such large openings are mainly because of architectural issues such as high traffic congestion, aesthetics, and parking. Creating these large openings, if accompanied by the removal of a column,...
Article
Full-text available
This study investigated the effects of applying a uniform magnetic field (UMF) of flux density 500 mili Tesla (mT) to fresh and hardened concrete specimens with steel fibers at volume ratios of 1 and 1.5% on mechanical and microstructural properties. To attain these objectives, compressive and splitting tensile strengths tests were carried out on t...
Article
Full-text available
Today, many strategies have been proposed to improve the behavior of tall buildings under seismic load. Drifts, torsion, and structure period are essential parameters affecting high-rise building behavior. In addition, the stress concentration at the end wing of shear walls is another critical subject in high-rise buildings, which was resolved usin...
Article
In this study, the influences of bidirectional carbon fiber–reinforced polymer (CFRP) confinement along with polypropylene fibers on the impact resistance of concrete samples were experimentally studied. Forty-nine concrete cylindrical samples (with compressive strengths of 20, 30, and 40 MPa) with polypropylene fibers (with content ratios of 0 %,...
Article
Full-text available
Corrosion phenomena is one of the main deterioration causes, which remarkably affects the behavior of structural reinforced concrete (RC) members in seismic regions. Researches on reducing rehabilitation cost, performance assessment, and accurate modelling of corrosion-affected RC structures are progressively becoming popular in recent years. Corro...
Preprint
Full-text available
In this study, the influences of bidirectional carbon fiber–reinforced polymer (CFRP) confinement along with polypropylene fibers on the impact resistance of concrete samples were experimentally studied. Forty-nine concrete cylindrical samples (with compressive strengths of 20, 30, and 40 MPa) with polypropylene fibers (with content ratios of 0 %,...
Article
Full-text available
Using high-strength reinforcements (HSRs) has several benefits in terms of financial and execution considerations. However, possible effects of HSR application on structural behavior such as ductility, energy dissipation, and damage process are not fully known for the researchers. In this study, firstly the HSR effects on the cyclic behavior, crack...
Article
Full-text available
ABSTRACT Owing to their excellent stiffness, reinforced concrete shear walls, as lateral load-bearing elements, considerably reduce the structure's seismic demand. Structural walls are designer-favorite components for their excellent stiffness and rigidity under lateral loading. Unlike steel chevron braces that buckle after a few loading cycles, sh...
Article
Full-text available
In this paper, the effects of macro-synthetic steel fibers and bidirectional carbon fiber-reinforced polymers (CFRPs) on the impact resistance of concrete specimens were studied. 54 concrete cylindrical specimens with different compressive strengths (20, 30, and 40 MPa) and with different fiber content ratios (0 %, 1 %, 1.5 %, and 2 %) were tested...
Preprint
Full-text available
Residential buildings consume a major portion of energy resources and hence are seriously involved in environmental pollution. In Iran, the consumption of fossil fuels is on the rise, to the extent that it has grown by more than 400% from 1990 to 2018. One of the fundamental solutions for reducing fossil fuel consumption and creating a healthy envi...
Article
Full-text available
Developments in polymer technology have introduced new choices such as using fibers and fiber-reinforced polymers (FRP) to improve the impact behavior of concrete structures. In this research, 52 concrete samples (half of which wrapped with glass fiber-reinforced polymers-GFRP) with different compressive strengths (20, 30, and 40 MPa) and polypropy...
Article
Full-text available
One of the common methods to create bond strength in reinforced concrete is providing development length. The bond strength of glass fiber reinforced polymer (GFRP) bar is inherently poor due to its shape, as well as its inadequate mechanical interlocking with concrete. Therefore, providing sufficient development length in this bar is different and...
Article
Full-text available
The effects of high-strength steel (HSS) on the damage indices (DIs) of four special moment frames and three beam–column connection (BCC) specimens under cyclical loading were experimentally studied. The specimens with HSS rebars (with yield strengths of 500 MPa and 580 MPa) were designed and constructed based on the special seismic provisions of A...
Research
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Shear failure is the major factor involved in the failure of structures and may occur in short columns. In this article, six reinforced concrete short columns are prepared and experimentally and numerically investigated using finite element analysis under cyclic lateral displacement. Since the failure occurred in short columns under earthquake is i...
Article
Full-text available
Generally, in reinforced concrete (RC) core wall buildings, the formation of one plastic hinge at the base is preferred; this is called the single plastic hinge (SPH) approach. During a severe earthquake, this approach results in significant moment demand in the upper regions of the wall due to the effect of higher modes of vibration. This study co...