Amin Gholizad

• Ph.D.
• University of Mohaghegh Ardabili

This research assesses the effect of inter-story seismic isolators on the seismic performance of composite steel-concrete structures. Two buildings, one with 5 stories and another with 9 stories, were analyzed under three scenarios: (1) without isolators, (2) with lead-core rubber isolators having a natural period of 2.5 seconds, and (3) with a 3-s...

A novel hybrid optimization algorithm, chaos game optimization–differential evolution (CGO-DE), is developed in this study for the size optimization of structures. The key contribution lies in the synergistic combination of chaos game optimization (CGO) and differential evolution (DE), using their respective strengths in exploration and exploitatio...

Numerous studies have been conducted in the past to enhance the seismic performance of reinforced concrete (RC) beam-to-column joints (BCJs) through various approaches to strengthen the connection for plastic hinge relocation. Despite the widespread adaption of the local weakening method in steel beam-to-column connections, its application in reinf...

This study assesses and compares the performance of two types of dampers, namely Tuned Mass Dampers (TMD) and Friction Tuned Mass Dampers (FTMD), in reducing displacement and acceleration of the top story of structures during seismic events. The study involves modeling a two-dimensional steel frame in three different scenarios: without control, wit...

Isolators and dampers are devices that dissipate energy and reduce the seismic response of structures during strong earthquakes. Lead Rubber Bearings (LRBs) and Tuned Mass Dampers (TMDs) are two common types of these devices. Studying non-linear behavior and seismic properties of structural systems equipped with this type of isolators and dampers c...

Non-destructive damage detection methods analyze the output data collected from sensors to track the changes in the dynamic characteristics of the structure and detect the occurrence of damages. continuous recording and analysis of data to be aware of its safety and serviceability requires a network of sensors that are selected optimally and intell...

Long-span structures like bridges experience different movements at the supports because of the wave-passage, incoherence, and site-response effects. In this study, spatially varying ground motions were used to evaluate the seismic vulnerability of different RC bridges. To gain the goal, three prototypes of Caltrans reinforced concrete curve bridge...

پل ها نقش بسیار حیاتی در توسعه اقتصادی داشته به طوریکه آسیب دیدن آنها می تواند عواقب جبران ناپذیری به همراه داشته باشد. لذا طراحی دقیق آن بسیار حایز اهمیت است. مطالعات انجام شده طی سه دهه گذشته حاکی از آن است که پاسخ لرزه ای واقعی بدست آمده برای پل های با دهانه بلند با آنچه که بر اساس روش های تحلیلی اشاره شده در آیین نامه های حاضر بدست آمده متفاوت...

Long-span bridges, as vital structures, play an important role in economic development. Previous studies revealed that the seismic responses of such structures, under non-uniform excitations, are different from the same result due to uniform excitations. Furthermore, the results of several earthquake-damaged bridges showed that their seismic behavi...

The subject of structural health monitoring and damage identification of structures at the earliest possible stage has been a noteworthy topic for researchers in the last years. Modal strain energy (MSE) based index is one of the efficient methods which are commonly used for detecting damage in structures. It is also more effective and economical t...

The subject of structural health monitoring and damage identification of structures at the earliest possible stage has been a noteworthy topic for researchers in the last years. Modal strain energy (MSE) based index is one of the efficient methods which are commonly used for detecting damage in structures. It is also more effective and economical t...

Damage detection of structures is one of the most important topics in structural health monitoring. In practice, the response is not available at all structural degrees of freedom, and due to the installation of sensors at some degrees of freedom, responses exist only in limited number of degrees of freedom. This paper is investigated the damage de...

Damage detection of bridge structures during their operating lifetime is essential. In this paper, two approaches, All Degrees of Freedom and Reduction of the Degrees of Freedom methods, are used to detect the damages in structures. The first method considers All Degrees of Freedom of the structure and the second method, Reduction of the Degrees of...

The modal strain energy method is one of the efficient methods for detecting damage in the structures. Due to existing some limitations in real-world structures, sensors can only be located on a limited number of degrees of freedom (DOFs) of a structure. Therefore, the mode shape values in all DOFs of structures cannot be measured. In this paper, a...

The design of tuned-mass dampers is based on minimising lateral displacement (displacement-based design) and then maximising performance (reliability-based design). The research study reports that genetic algorithms (GAs) were used to solve this optimisation problem. The performance of displacement-based designs was evaluated using Monte Carlo simu...

One of the methods for assessing the potential of progressive collapse occurrence is the APM method. This method is done by direct removing of one or several columns. However, in this method, the damage of adjacent elements of removed columns under blast conditions was ignored and this issue can lead to an incorrect prediction of progressive collap...

There is rising concern among researchers regarding the suitability of structural design for abnormal load resistance. Abnormal loading generated by a blast or impact can cause local damage to a structure that could affect the entire structural system. Structures must be designed to prevent such disproportional consequences. Research has focused on...

Displacement- and reliability-based designs of tuned mass damper (TMD) for a shear building are studied herein. Different sources of uncertainties such as earthquake records and their peak ground accelerations (PGA), masses of floors, cross-sectional dimensions of structural members, damping of the structure and modulus of elasticity are considered...

Although many studies have been carried out to optimize the performance of space structures, no research has been undertaken into nondestructive evaluation and health control of space structures. Multiplicities of structural elements and joints are the main challenges in damage detection of space structure. In this research, a new two-dimensional (...

Concrete Filled Double Steel Tubes are mostly used in bridge piers, tall buildings, offshore and coastal structures and power transmission towers. Finite element analyses via ABAQUS software have been performed aiming to evaluate the strength, ductility and plastic deformation of CFDST columns with different hollow ration and stiffeners configurati...

High performance and reliability of refurbish able knee braced steel frames has been confirmed in previous researches trying to get an optimal design for its configuration. Buckling of diagonal member which affects the hysteretic behavior of KBF under cyclic loadings has not been foreseen in previous evaluations of this system. This deficiency can...

High performance and reliability of refurbish able knee braced steel frames has been confirmed in previous researches trying to get an optimal design for its configuration. Buckling of diagonal member which affects the hysteretic behavior of KBF under cyclic loadings has not been foreseen in previous evaluations of this system. This deficiency can...

The uncertain nature of future ground motions is leading to development of probabilistic structural damage estimation procedures. Fragility curves are useful tools for showing the probability of structural damage due to earthquakes as a function of ground motion indices. The contribution of this study is to develop the fragility curves for mid-rise...

Structural systems will normally fail as a consequence of a chain of different components failure es. In this paper, fatigue reliability of fixed offshore platforms is investigated by analyzing different failure scenarios. In order to evaluate the occurrence probability of a special scenario, it is divided into a finite number of sub-scenarios. All...

The awareness of fatigue degradation in metallic structures started in the mid 19th century with the occurrence of fatigue failures in the railway industry. In later years, fatigue failure of pentagon-type semi-submersible “Alexander L. Kielland" platform, caused an increased focus on fatigue problems in the offshore industry. In this paper, a seco...

The awareness of fatigue degradation in metallic structures started in the mid 19th century with the occurrence of fatigue failures in the railway industry. In later years, fatigue failure of pentagon-type semi-submersible “Alexander L. Kielland" platform, caused an increased focus on fatigue problems in the offshore industry. In this paper, a seco...

Performances of tuned mass dampers and friction dampers to mitigate the wave induced vibrations in jacket type offshore platforms have been compared in this study. Due to the random nature of ocean waves, a full stochastic analysis method has been used to evaluate the response of the structures equipped with these devices. A stochastic linearizatio...

The performance of friction dampers to mitigate the wave-induced vibrations in jacket-type offshore platforms has been investigated in this study. Due to the random nature of ocean waves, a full stochastic analysis method has been used to evaluate the response of the structures equipped with these devices. A stochastic linearization technique has a...

Considering the stress cycles in the joints and members due to wave induced forces on offshore platforms, fatigue analysis is therefore one of the most important analyses in the offshore platforms design. Although most of the steel jacket type platforms are designed and located in areas with relatively high ratios of operational sea-states, for max...

The performance of friction dampers to mitigate the wave induced vibrations in jacket type offshore platforms has been investigated in this study. Due to the random nature of ocean waves, a full stochastic analysis method has been intended to evaluate the response of the structures utilized with these devices and also a stochastic linearization tec...

Considering the stress cycles in joints and members due to wave induced forces on offshore platforms, fatigue analysis is therefore one of the most important analyses in offshore platforms design. Most of steel jacket type platforms located in areas with relatively high ratios of operational sea-states to maximum design environmental events; fall i...