Majid Pouraminian | Islamic Azad University, Ramsar Brach, (original) (raw)

Papers by Majid Pouraminian

Advances in Bridge Engineering

This paper investigates the effects of earthquakes’ duration, intensity, and magnitude on the sei... more This paper investigates the effects of earthquakes’ duration, intensity, and magnitude on the seismic response of reinforced concrete (RC) bridges retrofitted with seismic bearings, such as elastomeric bearings (EB), lead rubber bearings (LRB), and friction pendulum bearings (FPB). In order to investigate the effects of the seismic isolation, the condition of the deck with a rigid connection on the cap beams and abutments (i.e., without isolation) was investigated as the first model. The EB, LRB and FPB bearings are used between the superstructure and substructure of the studied bridge in the second, third and fourth models, respectively. First, the effects of using seismic bearings on the seismic retrofit of an RC bridge under the Tabas earthquake were investigated. The results of the nonlinear dynamic analysis showed that the use of seismic bearings leads to seismic retrofit of the studied bridge, and FPB and LRB had the best results among the studied isolation equipment, respecti...

Journal of Vibration and Control

Dual earthquake-resistant archetypes suffer residual damage following a severe earthquake leading... more Dual earthquake-resistant archetypes suffer residual damage following a severe earthquake leading to socio-economic drawbacks. A vertical isolated rocking core-moment frame (VI-RCMF) provides a resilience technique to curtail the seismic vulnerability using the isolation of subsystems. Viscous dampers, installed at each floor level of the VI-RCMF archetype, separate moment frame (MF) from rocking-core (RC). The self-centering RC performs as a passive strong-back core, which can uplift on its toes. Although the VI-RCMFs have exhibited superior performance compared to non-isolated dual frames, there are analytical challenges to come up with the optimal design due to the complex interaction of subsystems. This paper presents an optimization framework for quantifying the optimal design parameters of VI-RCMFs. Accordingly, the simultaneous perturbation stochastic approximation (SPSA) method is employed as the optimization algorithm. The objective function is defined to minimize the displ...

This paper investigated the effects of the duration, intensity, and magnitude of earthquakes in s... more This paper investigated the effects of the duration, intensity, and magnitude of earthquakes in seismic retrofitting of RC bridges using seismic bearings. First, the seismic retrofit of an RC bridge using seismic bearings under the Tabas earthquake was investigated. Seismic bearings included elastomeric bearing (EB), lead rubber bearing (LRB), and friction pendulum bearing (FPB). In order to investigate the effects of this equipment, the condition of the deck with a rigid connection on the cap beams and abutments was investigated in another model. The results of the studies showed that the use of seismic bearings leads to seismic retrofit of the studied bridge, and FPB and LRB had the best results among the studied equipment, respectively. The same models were studied subjected to the Landers earthquake. The magnitude is equal to Landers and Tabas earthquakes, but the duration and intensity of the Landers earthquake are much larger than Tabas earthquake. The Landers earthquake cause...

Journal of Building Pathology and Rehabilitation

Civil and Environmental Engineering Reports

Nowadays, the use of smart materials in structures is a major concern to structural engineers. Th... more Nowadays, the use of smart materials in structures is a major concern to structural engineers. The act of benefiting from numerous advantages of these materials is the main objective of researches and studies focused on seismic and structural engineering. In the present study, in addition to the development of finite element models of several steel frames using ABAQUS software, the effect of shape memory alloys (SMAs) on superelastic behavior and the various types of eccentric braces will be checked. Moreover, it was observed that the use of SMAs within various types of bracing systems of steel frames leads to a decrease in the reduction factor of the frames. Also, the eccentric bracing in which SMAs are utilized in the middle of bracing led to the highest effect on reduction of lateral drift of the frames and decrease of reduction factor. The obtained results indicated that the application of smart materials led to increasing of strain energy and base shear of the first plastic hin...

Journal of the Croatian Association of Civil Engineers, 2015

Shape optimisation of concrete open spandrel arch bridges An open spandrel arch bridge is analyse... more Shape optimisation of concrete open spandrel arch bridges An open spandrel arch bridge is analysed in this paper. A computer code is written to create a model from geometrical data, so as to solve the optimisation problem. An optimum design procedure is conducted in the paper, and the total material volume of the bridge substructure is adopted as an objective function. The substructure includes the column and the reinforced-concrete arch. Finally, the optimization technique is implemented using the Simultaneous Perturbation Stochastic Approximation algorithm.

Historical brick minarets are the main elements of Iranian architecture and exist throughout the ... more Historical brick minarets are the main elements of Iranian architecture and exist throughout the country in different dimensions and heights. In this paper, GASKAR brick minaret with a height of 16.11 meters has been modeled with the finite element software by APDL programming and precise discretization in order to achieve an accurate damage pattern. Then the demand for wind load and earthquake load is determined according to the national building codes and applied to the minaret structure. Macro-modeling has been used to model the masonry materials domain. Nonlinear properties are also assigned to masonry materials. The results showed that the minaret is safe against both of the design wind load (90km/h) and the fastest recorded wind in the world(205km/h). If up to 12 times the design wind load is applied to the surface of the minaret, the nonlinear behavior of the building will begin. The minaret is also vulnerable to earthquakes and minor damage has occurred at the bottom of the minaret, indicating that the minaret is at risk of collapse.

Civil and Environmental Engineering Reports, 2021

In the paper, the effects of different percentages of additives (perlite, LECA, pumice) on the me... more In the paper, the effects of different percentages of additives (perlite, LECA, pumice) on the mechanical properties of structural lightweight aggregate concrete were tested and evaluated. For the research, 14 mixing designs with different amounts of aggregate, water, and cement were made. Experimental results showed that the specific gravity of lightweight structural concrete made from a mixture of LECA, pumice, and perlite aggregates could be 25-30% lighter than conventional concrete. Lightweight structural concrete with a standard specific gravity can be achieved by using a combination of light LECA with perlite lightweight aggregates (LA) and pumice with perlite in concrete. The results indicated that LECA lightweight aggregates show more effective behavior in the concrete sample. Also, the amount of cement had a direct effect on increasing the strength regardless of the composition of LAs. The amount of cement causes compressive strength to increase. Furthermore, the stability ...

Civil and Environmental Engineering Reports, 2021

In this paper, several analytical models are presented for the optimal design of a trapezoidal co... more In this paper, several analytical models are presented for the optimal design of a trapezoidal composite channel cross-section. The objective function is the cost function per unit length of the channel, which includes the excavation and lining costs. To define the system, design variables including channel depth, channel width, side slopes, freeboard, and roughness coefficients were used. The constraints include Manning’s equation, flow velocity, Froude number, and water surface width. The Simultaneous Perturbation Stochastic Approximation (SPSA) algorithm was used to solve the optimization problem. The results are presented in three parts; in the first part, the optimal values of the design variables and the objective function are presented in different discharges. In the second part, the relationship between cost and design variables in different discharges is presented in the form of conceptual and analytical models and mathematical functions. Finally, in the third part, the cha...

Journal of Building Pathology and Rehabilitation, 2021

In this study, the geometrical parameters of T-connection are assessed under fire loading. In the... more In this study, the geometrical parameters of T-connection are assessed under fire loading. In the following, ST37 material has been used in the modeling procedure of T-connection. Meanwhile, fire loading is conducted according to the Eurocode standard and the temperature-time curve is applied based on the ISO 834 standard. In this research, nine prototypes of T-connection are modeled in ABAQUS software by considering the geometrical parameters such as the diameter and number of bolts, length, and thickness of T-connection. By comparing the results of nine models, the higher amounts of stress are seen in the beam-to-column connections with increasing connection length. By changing each of the parameters, the failure modes are altered relative to the thickness of connections under fire loading. Although the number of bolts parameter is effective in order to reduce the displacement and ductility in the connections, and increasing the absorption capacity and the amount of stiffness and strength in higher temperatures. The obtained results showed that by increasing the bolt diameter of the COL. M16-N4-TST15 and COL.M20-N4-TST15 samples, the displacement value is reduced 10% and 14%, respectively, compared to the reference sample. Also, by enhancing the bolt number of the COL.M22-N4-TST15 and COL.M12-N8-TST15 samples, the displacement value is decreased 17% and 30%, respectively, in comparison with the reference sample. Meanwhile, when the T-connection thickness of COL.M20-N4-TST20 and COL.M20-N4-TST25 samples is increased, the displacement value is decreased by 19% and 22%, respectively, compared to the reference sample.

This study aims to investigate failure mechanism of historical tomb of Shahab-edin Ahary elements... more This study aims to investigate failure mechanism of historical tomb of Shahab-edin Ahary elements and determines areas prone to structural failure. Since Ahar is one of the most earthquake-prone cities of Iran with relative risk of large earthquakes, the presence of multiple faults in this area as well as historical, cultural and tourism importance of the building, makes its vulnerability assessments and retrofitting inevitable. Because of low adhesion strength of masonry used in the building and regarding its vulnerability records on previous earthquakes, the building seems weak against relatively intense earthquakes. The aim of this study is to investigate vulnerability of this building against possible earthquakes. Selected earthquakes for seismic loading are modified for the maximum horizontal acceleration obtained for this region. Various results have been studied after utilize finite element model using Ansys software and various analyses.

This study analytically and experimentally investigates the leakage in homogenous earth dam (clay... more This study analytically and experimentally investigates the leakage in homogenous earth dam (clay) reinforced by recycled PET. First, the effect of PET addition on permeability of clay in geotechnical laboratory is evaluated, according to the results of first step, a physical model of homogenous earth dam is prepared in laboratory flume, both in PETs or without PETs and measured the water height in dam body using piezometers installed on flume body and also leakage discharge was calculated. Third, phreatic line formed in the body of dam and the pore pressure of it was analyzed regarding the first and second phases. The impact of output discharge reduction on dam stability was also studied in software; PET addition impact on output discharge reduction was 23.14%. Discharge reduction lead to increase of dam stability.

Journal of Building Pathology and Rehabilitation, 2021

امروزه مهاربندهای کمانش‌تاب (BRB) باتوجه به عدم کمانش در فشار، به عنوان سیستم مقاوم در برابر باره... more امروزه مهاربندهای کمانش‌تاب (BRB) باتوجه به عدم کمانش در فشار، به عنوان سیستم مقاوم در برابر بارهای جانبی در نظرگرفته می‌شود. ولی این مهاربندها دارای معایبی نیز می باشند. ازجمله این معایب ایجاد تغییر شکل‌های ماندگار در سازه بعد از پایان بارگذاری و همچنین هزینه بر بودن تعویض این اعضا پس از خرابی و جاری شدن هسته‌ی فولادی این مهاربندها می باشد. از این ‌رو استفاده از آلیاژهای حافظه‌دار شکلی (SMAs) در سیستم‌های مهاربندی کمانش‌تاب با توجه به ویژگی‌های خاص این آلیاژها، می‌تواند گام مؤثری در بهبود پاسخ‌های لرزه‌ای باشد. در این تحقیق، ابتدا 2 قاب با تعداد طبقات 6 و12 دارای مهاربند‌های کمانش‌تاب در نرم-افزار ETABS بر اساس ضوابط آیین‌نامه‌ای به صورت سه‌بعدی طراحی و سپس قاب کناری آن‌ها در نرم‌افزار OpenSees به‌صورت دو بعدی در دو حالت با و بدون آلیاژ حافظه دار شکلی مدل‌سازی شده‌اند و در نهایت نقش آلیاژهای حافظه‌دار شکلی در آن‌ با استفاده از تحلیل‌های دینامیکی غیرخطی افزایشی (IDA) تحت 7‌زوج شتاب‌نگاشت دور از گسل پیشنهادی دستورالعمل FEMA P695 بررسی‌شده‌اند. بر اساس منحنی‌های IDA، ظرفیت فروریزش قاب...

This study follows two objectives: first, determining the effect of defining master dynamic degre... more This study follows two objectives: first, determining the effect of defining master dynamic degrees of freedom on vibrational properties and increase structure analysis running speed, and second, estimation of response accuracy and vibrational properties of simplified dynamic finite element model of the bridge by one-dimensional elements and lump masses. After designing simplified model of bridge with nine lump masses, the estimation error rate in dominated period of the structure is examined in both accurate model and lump mass. The mass and stiffness matrices derived from analysis of ANSYS software are also shown. The responses of accurate and simplified models are studied, and it was observed that the simplified finite element model has reasonable estimation of vibrational properties of the bridge.

Advances in Bridge Engineering

Journal of Vibration and Control

Journal of Building Pathology and Rehabilitation

Civil and Environmental Engineering Reports

Journal of the Croatian Association of Civil Engineers, 2015

Civil and Environmental Engineering Reports, 2021

Journal of Building Pathology and Rehabilitation, 2021

Shiraz University, 2008

رویداد زلزله های قبلی در آذربایجان و روند قرارگیری خطواره های ساختاری جنبا در منطقه نمایانگر پهنه... more رویداد زلزله های قبلی در آذربایجان و روند قرارگیری خطواره های ساختاری جنبا در منطقه نمایانگر پهنه ای بسیار لرزه خیز است. از طرف دیگر با توجه به وجود بناهای میراث فرهنگی متعدد در استان، یکی از استان های تاریخی کشور است. زمان ساخت تعداد زیادی از بناهای شکوهمند این استان به دوره ی ایلخانی نسبت داده شده است. لذا باید نسبت به حفظ و مقاوم سازی این ثروت های ملی کوشید. هدف از این تحقیق مدلسازی نرم افزاری به روش ماکرو و بررسی آسیب پذیری تعدادی از مهم ترین بناهای دوره ی ایلخانی استان توسط نرم افزار Ansys می باشد.

Tehran University, 2008

ارگ تبریز قدمت 700 ساله دارد و در برابر تقاضای لرزه ای ساختگاه آسیب پذیر است

یکی از راه¬های مهار نیروهای رانشی در اتصالات لوله¬های تحت فشار، استفاده از بلوک¬های مهاری می¬باشد... more یکی از راه¬های مهار نیروهای رانشی در اتصالات لوله¬های تحت فشار، استفاده از بلوک¬های مهاری می¬باشد. محاسبه بلوک مهاری به روش سعی و خطا انجام شده که این امری زمانبر و طولانی است. در این پژوهش با استفاده از زبان برنامه نویسی متلب، الگوریتمی مناسب جهت طراحی بهینه بلوک مهاری ارائه شده¬ است. محاسبات یکبار برای ضخامت خاکریز 1، 5/1 و 2 متر و و یکبار برای خاک¬های رس سخت شده، ماسه خشک و خاک معمولی تکرار شد، نتایج حاصل شده نشان دادکه الگوریتم طراحی شده کارایی خود را در طراحی بلوک مهاری بادقت بالا اثبات کرده است همچنین با افزایش ضخامت خاکریز روی لوله و وزن مخصوص آن مقدار حجم بتن مصرف شده در بلوک مهاری برای اتصال خم افقی کاهش می¬یابد و هرچه مقدار زاویه اصطکاک داخلی خاک کمتر باشد، میزان حجم بتن مصرفی در بلوک مهاری افزایش می¬یابد.

Shiraz University, 2019

بررسی دقیقِ وضعیتِ ایمنی پل های تاریخی بنایی نیازمند شناختِ دقیقتر توابعِ ضمنی بار و مقاومت سازه ... more بررسی دقیقِ وضعیتِ ایمنی پل های تاریخی بنایی نیازمند شناختِ دقیقتر توابعِ ضمنی بار و مقاومت سازه ی پل است. نوآوری های این مقاله بکارگیری احتمالاتی توابع بار و مقاومت به خاطرِ ذاتِ احتمالاتی متغییرهای مستقلِ این توابع شاملِ سربار عبورگاه، ویژگی های فیزیکی و مکانیکی مصالح بدنه پل می باشد. در این مقاله وضعیت ایمنی آنها فقط در حالت حدی بهره برداری بررسی شده است.همچنین آنالیز حساسیت متغییرهای تصادفی توابع ضمنی به پاسخ تغییرشکلی و تنشی پل بررسی شده است و پارامترهای تصادفی با تاثیر بیشتر مشخص شده است. مطالعه ی موردی پل خشتی لنگرود نشان داد که ایمنی لازم برای حالت حدی بهره برداری تامین نشده است.

هدف از مقاله ی حاضر تحلیل سازه ی پل بنایی تاریخی در حالت حدی سرویس دهی می باشد. عدم قطعیت های مقا... more هدف از مقاله ی حاضر تحلیل سازه ی پل بنایی تاریخی در حالت حدی سرویس دهی می باشد. عدم قطعیت های مقاومت مصالح پل، جرم پل و بار ترافیک عبورگاه پل به عنوان عدم قطعیت های شناختی مد نظر قرار گرفته است. برای تحلیل سازه قطعی از نرم افزار اجزای محدود و برای شبیه سازی تحلیل احتمالاتی از مونت کارلو- لاتین هایپر کیوب استفاده شده است. تعداد متغییرهای تصادفی ورودی و خروجی برنامه تهیه شده به ترتیب 18 و 6 عدد می باشند. از توزیع استاندارد گوس و لگاریتمی برای تعریف توابع چگالی احتمال متغییرهای ورودی مساله استفاده شده است. مطالعه ی موردی پل خشتی لنگرود که در میراث فرهنگی کشور ایران ثبت ملی شده انجام گرفته است. در نهایت احتمال خرابی بدست آمده بصورت عدد شاخص ایمنی بیان شده است. برای حالت سرویس دهی مقدار شاخص کمتر از شاخص خسارت هدف استاندارد ISO13822 است و پل تاریخی ایمنی لازم را ندارد.

Shiraz University, 2019

در این مقاله، بهینه‌سازی شکل کانال ذوزنقه‌ای مرکب با الگوریتم ژنتیک مورد بررسی قرار گرفت. تابع هد... more در این مقاله، بهینه‌سازی شکل کانال ذوزنقه‌ای مرکب با الگوریتم ژنتیک مورد بررسی قرار گرفت. تابع هدف، هزینه ساخت شامل هزینه‌های خاکبرداری و هزینه‌های پوشش کف و کناره‌های کانال، متغیرهای طراحی شامل عمق آب، عرض کف، شیبهای کناری و قیود شامل قید معادله مانینگ جهت برقراری جریان یکنواخت با ضریب زبری معادل هورتن و قید عدد فرود جهت اطمینان از برقراری جریان زیر بحرانی می باشد. در ادامه روند بهینه سازی با دبی های مختلف انجام شد . با افزایش دبی کانال، عرض کانال، ارتفاع کانال افزایش عدد فرود و هزینه ساخت افزایش و شیب (1/z) کانال کاهش می یابد.

Shiraz University, 2019

استفاده از تیرهای غیرمنشوری یکی از شیوه های بهینه سازی تیرها می¬باشد. در این مقاله با کمک الگوری... more استفاده از تیرهای غیرمنشوری یکی از شیوه های بهینه سازی تیرها می¬باشد. در این مقاله با کمک الگوریتم جایا بهینه سازی تیرهای غیرمنشوری با هدف کاهش وزن تیر انجام گرفته است. تعداد متغییرهای طراحی 8 عدد می باشد. برای تحلیل سازه رابطه اجزای محدود در نرم افزار متلب کدنویسی شده است. همچنین از روش جبهه پارتو به منظور بهینه سازی دوهدفه تیر غیرمنشوری نیز استفاده شده است. توابع هدف شامل وزن تیر و خیز ماکزیمم تیر در نظر گرفته شده است که هدف کمینه سازی این دو تابع می باشد.

Today there are many algorithms to solve optimization problems. In the meantime, meta-heuristic a... more Today there are many algorithms to solve optimization problems. In the meantime, meta-heuristic algorithms have been faced with the popularity of researchers. Over the past three decades, there are many metaheuristic algorithms. The presentation of each of these algorithms may be randomly implemented by other researchers in solving various problems of science. The Football Game Algorithm (FGA) is also proposed as a new meta-heuristic algorithm based on simulating the behavior of football players during a game to find the best mode for scoring goals under the supervision of the coach. In the present research, for the first time, this algorithm has been investigated in civil engineering structures including cantilever beam as a benchmark structure and compared to the results of the powerful particle swarm optimization algorithm (PSO) and the constrained minimization ( fmincon) of the toolbox of MATLAB. Also, because of the random intrinsic nature of the algorithms used in the research, for the statistical study of the structure of the benchmark structure, 30 times have been performed to investigate the sensitivity of their response. The results show that in spite of the random nature of the algorithm, the objective function changes are not tangible. After optimizing the size of the benchmark structure, it was found that savings of 8% to 70% The computational time ability of the algorithm to determine the absolute optimal response and the lower sensitivity to the random nature of the algorithm is dependent on the features of the game play algorithm in relation to the particle swarm algorithm and optimization.