Ali Ghamari

Islamic Azad University

The use of concrete-filled steel tubular (CFST) columns and reinforced concrete (RC) shear wall mixed structures has attracted the interest of structural engineers. The connection between the composite columns, the shear-wall edge members and concrete wall are critical. The connection behavior at the interface of the different elements has been a m...

Past earthquakes had shown vulnerability of infill walls especially under out of plane (OOP) loading. Although some new infill walls show a good OOP performance, generally, they do not have the right economic justification or have complexity in construction. Therefore, in this paper, an innovative economical infill wall is presented that is not com...

Over the past few decades, concentrically braced frames (CBFs) have become a commonly used load-resistant bearing system in steel structures. CBF systems have high lateral stiffness and lateral strength; however, they have low ductility and a low seismic energy dissipating capacity. Under seismic loading, the diagonal elements of a CBF system are s...

Although concentrically braced frames (CBFs) possess high lateral stiffness and strength, the buckling of compressive members indicates that a system does not have appropriate ductility. Therefore, CBF is not a successful system for high seismic regions. Comprehensive studies have been performed on this drawback concerning CBF systems. The use of a...

Eccentrically Braced Frames (EBFs) have a capability of energy dissipation relying on horizontal link beams in main frame. Use of vertical link (V-EBF) enhances system performance; main frame damaged, easy replaces after earthquake, and it can be rehabilitated minor changes of existing structure. This paper describes experimental and analytical stu...

The susceptibility of the diagonal member of the Concentrically Braced Frames (CBFs) to buckling reducesthe energy-dissipating capacity of the CBFs. Despite of high ultimate strength and stiffness of the CBFs as considerable advantages, its shortcoming (low dissipating energy capacity) is accounted as an important dilemma for this system. Although...

In this paper, an innovative infill wall is proposed and examined experimentally and parametrically. The proposed wall has an innovative design and is constructed with lightweight concrete strengthened by waste glass. The proposed wall not only demonstrates robust performance against out-of-plane loading, but also exhibits exceptional behavior unde...

The present study was undertaken to characterize the structural behavior and ultimate flexural strength of steel plate I‐girders under pure flexural moment at elevated temperatures. A novel design procedure along with flexural design curves was proposed to predict the flexural behavior of the I‐girders and estimate corresponding ultimate flexural s...

Although the concentrically braced frames (CBFs) systems have high lateral elastic stiffness and strength, they reflect a low seismic energy absorption capacity mainly due to their diagonal buckling under compressive loading. To overcome this problem, researchers have proposed metallic shear damper as the most popular due to its satisfactory perfor...

The Steel Plate Shear Walls (SPSWs) are known as a capable system to use in steel structures due to their significant advantages. Despite extensive studies concerning this system, few researchers have scrutinized the crack effect on SPSW behavior. However, the crack dramatically affected the experimental results. In the current paper, the effect of...

The steel shear wall has been introduced as a system with high stiffness and strength and a considerable capability in absorbing seismic energy. Due to its special advantages compared to other lateral load-resistant systems, this system is being used in tall buildings more and more frequently. Ductility and energy absorption are important parameter...

Shear dampers are known as famous seismic passive energy devices due to their suitable performance against seismic loading to improve the behavior of Concentrically Braced Frames (CBFs). The CBF system suffers from low ductility due to its compression member's susceptibility to buckling. By adding the shear dampers directly to the diagonal element...

Although Steel Plate Shear Walls (SPSWs) have revealed worthy performance in past studies, the need for huge columns surrounding the infill plate is accounted as a considerable shortcoming. This problem is created due to transferring the infill plate stress to the columns by post‐bucking. Despite using the semi‐supported SPSW, the problem is solved...

The concentrically braced frame (CBF) suffered from low dissipating energy capacity although it pertains to a high lateral elastic stiffness and ultimate strength. To overcome the shortcoming, in this paper, an innovative damper made of two butterfly‐shaped plates installed at the end of the diagonal member of the CBF was considered experimentally...

Despite the high lateral stiffness and strength of the Concentrically Braced Frame (CBF), due to the buckling of its diagonal members, it is not a suitable system in high seismic regions. Among the offered methods to overcome the shortcoming, utilizing a metallic damper is considered as an appropriate idea to enhance the behavior of Concentrically...

Though concentrically braced frames pertain to high elastic stiffness and strength, their low ductility has been introduced as a no-desirable system in the high seismic risk zone. Utilizing passive energy dampers as a capable and economical idea, the shortcoming can be solved. Experimental and numerical studies on the pipe dampers confirmed their s...

Today, the use of recyclable materials has been the focus of researchers around the world. The use of recycled concrete aggregates, although beneficial for environmental reasons, brings many problems. One of the basic factors is the presence of old mortar and impurities in these aggregates. Therefore, it is necessary to conduct comprehensive studie...

Studies on corrugated steel shear walls (CSSWs) generally indicate a noticeable increase in energy absorption, as well as an increasing shear buckling capacity of corrugated plates more than the flat plates. In this article, the effect of changing the angle of the trapezoidal panel on the behavior of CSSWs has extensively been investigated. Three s...

Foamed concrete is a lightweight construction material that has gained popularity due to its excellent thermal and acoustic insulation properties. Foamed concrete production involves using cement as a binding agent, which results in a high carbon footprint. In response to sustainable development goals (SDG), there has been a growing interest in exp...

Concentrically braced frame (CBF) systems are susceptible to buckling (which causes a decrease in energy absorption), although this system has considerable lateral stiffness and strength. To over this shortcoming, researchers have suggested the use of I-shaped steel dampers as a practical idea that prevents buckling and increases the energy absorpt...

Among the existing passive energy dampers, I-shaped shear dampers had shown suitable performance in experimental and numerical studies. Although they improve the dissipating energy and ductility of concentrically braced frames (CBFs), they reduce the stiffness and ultimate strength of the system. Three approaches are generally used to overcome the...

Observations of past earthquakes as well as numerical and experimental studies have confirmed the acceptable performance of Steel Plate Shear Walls (SPSW). Although the SPSW has a number of advantages, it has two major flaws: low elastic-buckling capacity of the infill plate and significant stresses generated by the infill plate on the boundary col...

Fire can be an adverse event with tangible costs for property and human life. In addition to its physical costs, fire has a range of obvious adverse consequences on the environment. One of the fire’s adverse outcomes is its effect on the structures. Corrugated Steel Plate Shear Walls (SPSWs) are environmentally friendly since they can be manufactur...

Despite the considerable lateral stiffness and strength of the Concentrically Braced Frame (CBF), it suffers from low ductility and low seismic dissipating energy capacity. The buckling of the diagonal members of the CBF systems under cyclic loading ended up to the shortcoming against seismic loading. Comprehensive researches have been performing t...

Although concentrically braced frame (CBF) systems enjoy high elastic stiffness and lateral strength, they show a low seismic energy absorption capacity. This dilemma is due to the buckling of CBFs’ diagonal members under compressive loading. To overcome the shortcoming, researchers have proposed the use of dampers to improve the behavior of CBF sy...

Although Concentrically Braced Frame (CBF) is a system with high lateral stiffness, buckling under compressive forces has made it a system with weakness in ductility and not appropriate enough for high seismic zones. Many researchers put a lot of effort into improving the performance of this system by using different methods. Using metallic dampers...

Despite the considerable advantages of the Steel Plate Shear Wall (SPSW), this system suffers from two shortcomings; the imposed large stresses from the infill plate to the boundary columns and the low elastic bucking capacity of the infill plate. Although several techniques have been proposed to solve this problem, they have their own limitations....

An innovative passive energy damper is introduced and studied experimentally and numerically. This damper is designed as the main plate for energy absorption which is surrounded by an octagon cover. In addition to simplicity in construction, it can be easily replaced after a severe earthquake. Experimental test results, as well as finite element re...

In reinforced concrete (RC) frames, the applied seismic energy is dissipated through the ductile behavior of RC moment resisting frames. The main elements of the RC frames carry the gravity loads in addition to the seismic loads. Since the RC frames are sensitive to gravity loads, the ductility of the frames is reduced by increasing the gravity loa...

The buckling resisting brace (BRB) is an efficient system against lateral loads that enjoy high seismic energy absorption capacity. Although desirable behavior of BRBs has been confirmed, the stiffness of the system is not desirable that it can be compensated by changing the configuration of BRB braces. In so doing, the configuration in the form of...

Concentrically braced structures are one of the most common resistant systems in steel structures due to their high stiffness and lateral strength. However, when these structures are subjected to moderate and severe earthquakes, their compression member begins to buckle. Also, buckling of compression members in Concentrically Braced Frames (CBFs) d...

This paper presents a combination of corrugated and flat plates to construct a seismically efficient compound section for steel shear walls. To assess the efficiency of the proposed section, a numerical and parametrical study was conducted using Finite Element (FE) software ABAQUS. The parametrical study included 45 different FE models consisting o...

Steel Plate Shear Walls (SPSWs) have high stiffness, strength, and considerable energy absorption capability, which have persuaded engineers to utilize the system in their practical projects. Some significant characteristic SPSWs have remained unknown despite worthwhile experimental and numerical studies. One of these unknown aspects is the effect...

It seems necessary to develop a simplified design approach in order to evaluate the shear strength of web panels under fire condition as the size of furnaces is limited, the cost of experiments aimed at testing the fire resistance of structures is quite high and access to simulation software packages such as ANSYS and ABAQUS is not always guarantee...

This paper relies on the finite element method to find the safe factor considering the economical aspect to design members outside the short shear links with/without stiffeners constructed from low-yield-point (LYP) steels with nominal yield strength of 100 and 225 MPa. To this end, 147 I-shaped shear links with link length ratios in the range of 0...

In this study, the performance of rectangular added damping and stiffness (RADAS) dampers has been introduced in the diagonal element site to avoid brace buckling and energy dissipation by dampers. The innovation of this research is in the type of site of steel plates and the way of connection in the vicinity of gusset plates which can be easily re...

In this study, High Performance Steel Plate Shear Wall (HPSPSW) were properly determined using numerical and paramedical approaches. The properties of HPSPSW and LYP (Low Yield Point) steel (LHPSPSW) were measured. In so doing, 27 numerical models were analyzed and evaluated. The numerical results indicated that the SPSW has a higher stiffness, ult...

پس از زلزله نورتریج مشخص گردید که اتصالات تیر به ستون در قاب‌های خمشی ضعیف است و نیاز به اصلاح و بازنگری دارد. در سال‌های اخیر استفاده از اتصالات پیچی گسترش یافته و تقریبا جایگزین اتصالات جوشی شده است. آیین نامه آمریکا (AISC358-16) اتصال جدیدی به نام اتصال سیپسون معرفی کرد که یک اتصال نیمه صلب با ایده کنترل خسارت می‌باشد. اتصال پیشرو نوع جدید و هوش...

Steel Plate Shear Wall (SPSW) has a good ductility, high strength and stiffness, and considerable energy absorption capability. These advantages have been confirmed in experimental and numerical studies. Despite the mentioned advantages, needing to use of huge columns surround of infill plate is the main limitation of SPSWs. Although High Performan...

The book provide the techniques on the analysis and design of structures based on the ETABS-2018. It is utilizable for students, designers (professional and armature), and teachers.

Adding fibers improves concrete performance in respect of strength and plasticity. There are numerous fibers for use in concrete that have different mechanical properties, and their combination in concrete changes its behavior. So, to investigate the behavior of the fiber reinforced concrete, an in vitro study was conducted on concrete with differe...

Experimental and numerical studies on Steel Plate Shear Wall (SPSW) and its successful performance under last earthquakes have introduced this system as a lateral bearing system. There are lots of unknown information about SPSW despite of numerous studies that have were done. The effect of crack on the SPSW behavior is one of unknowns about SPSW th...

In spite of existing comprehensive studies on the behavior of steel plate shear wall (SPSW), some aspects of the SPSW have remained unknown, yet. One of the important aspects that is unknown is the crack effect on the SPSW behavior in linear and nonlinear zones. Some experimental studies have been reported that SPSWs were fractured due to crack pro...

In spite of the good performance of the steel plate shear wall (SPSW) in recent earthquakes and experimental studies, the need for huge columns to surround the infill plate is a major shortcoming of the system. This shortcoming can be resolved by using semi-supported SPSW. The semi-supported SPSW has secondary columns that prevent the transfer of s...

Steel plate shear walls (SPSWs) have shown a desirable performance in experimental studies and past earthquakes. The advantages of the SPSW and its good performance against lateral loads persuade designers to utilize the system in their practical projects. Some important aspects of the SPSW have remained unknown in spite of valuable experimental an...

Steel plate shear wall (SPSW) had shown a good performance against lateral load in laboratories and last earthquakes. Despite its high shear stiffness, its low bending stiffness is the main concern about this system. Outriggers in conjunction with coupled SPSW that is investigated in this paper form an effective system with a high shear and bending...

In spite of extensive experimental and numerical investigations on steel shear walls, many ambiguities regarding the behavior of these walls still exist. One of these unknown characteristics, which have been less researched, is the effect of cracks on system behavior. Experimental studies have reported fracture on the corner of Steel Plate Shear Wa...

In this paper, the effect of a combinatorial lateral resisting system, composed of special truss moment frame (STMF) and outriggers, on the behavior of tall buildings is investigated. Outriggers in conjunction with STMFs form an effective system with a great stiffness as well as strength. The STMFs are efficient in controlling the lateral shear dis...

Passive steel dampers have shown favorable performance in last earthquakes, numerical and experimental studies. Although steel dampers are more affordable than other types of damper, they are not economically justified for ordinary buildings. Therefore, in this paper, an innovative steel damper with shear yielding mechanism is introduced, which is...

The excellent hysteretic behavior of Eccentrically Braced Frames (EBFs) using shear links have made these systems an effective alternative for both moment resisting frame as well as concentrically braced structures. In common practical horizontal shear links are located either at the middle or at the ends of the beam section. However, large deforma...

Inactive energy dampers organize efficient and economical systems for lateral bracing. In kind of any inactive dampers, steel dampers are very acceptable because those are comfortable performance, good economical and resorting materials. Another reason, these dampers displaied resonable reaction in laboratories and old earthquakes. However the damp...

Inactive energy dampers organize efficient and economical systems for lateral bracing. In kind of any inactive dampers, steel dampers are very acceptable because those are comfortable performance, good economical and resorting materials. Another reason, these dampers displaied resonable reaction in laboratories and old earthquakes. However the damp...

Design of steel structure under blast loading

The excellent hysteretic behavior of Eccentrically Braced Frames (EBFs) using shear links have made these systems an effective alternative for both moment resisting frame as well as concentrically braced structures. In common practical horizontal shear links are located either at the middle or at the ends of the beam section. However, large deforma...

Numerical investigations carried out into the effect of crack and its growth on the seismic behavior of steel shear walls are presented in this paper. Twenty two steel shear walls with initial central or edge crack were modeled using general purpose finite element programs of ANSYS and ABAQUS. The numerical method used in this study is extended fin...

میراگرهای غیر فعال انرژی به عنوان یک سیستم کارا در برابر بارهای لرزه ای شناخته شده اند. در میان انواع میراگرهای غیرفعال، میراگرهای فولادی به دلیل سهولت اجرا، اقتصادی بودن و در دسترس بودن امکانات ساخت از مقبولیت بیشتری برخوردار است. از طرفی این نوع میراگرها، عملکرد مناسبی در آزمایشگاهها و زلزله های گذشته داشته اند. هر چند این نوع میراگرها نسبت به سا...

Steel shear wall (SSW) was properly determined using numerical and experimental approaches. The properties of SSW and LYP (low yield point) steel shear wall (LSSW) were measured. It is revealed that LSSW exhibits higher properties compared to SSW in both elastic and inelastic zones. It is also concluded that the addition of CFRP (carbon fiber reinf...

In this paper behavior of steel shear wall Composited (CSSW) with carbon fiber polymer in different angles have investigated. The present experimental and numerical studies conducted to carry out the effects of fiber polymer, angle of fiber polymer. Results showed that the CFRP enhance the behavior of CSSW. Despite the advantages of CSSW, there are...

In this paper, a new passive energy damper with torsional mechanism was introduced and studied in numerical and experimental approaches. Experimental results showed a stable hysteresis loop for damper. The requirement recommendations and mathematical formulas to analysis and design was presented. Those formulas have a good accuracy to predict the d...

In this study, nonlinear behavior of steel shear walls (SSW) and composite steel shear wall reinforced with carbon fibers (CSSW) was investigated. Experimental and numerical studies were carried out to evaluate the effects of fiber content/angle and panel width on the properties of these walls. Results showed that wider panel widths enhance the beh...

Due to unique properties of carbon fibres, composites reinforced with these fibers often are used in various structural applications. And other hand steel shear walls (S.S.W) had been a good performance in laboratories and last earthquake. The S.S.W infill buckle under small lateral loading, so to solve this problem, strengthen of S.S.W by CFRP was...