
Mohammad YekrangniaShahid Rajaee Teacher Training University | SRTTU · Department of Civil Engineering
Mohammad Yekrangnia
Doctor of Philosophy
University's Director of Entrepreneurship;
Director of the Structural and Earthquake Engineering Group
About
116
Publications
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Introduction
Mohammad Yekrangnia, is a faculty member of Civil Engineering Department, Shahid Rajaee University. He co-authored five books and published over 70 peer-reviewed papers in reputed international journals and conferences. His research interests include seismic retrofit of buildings, masonry buildings, seismic risk analysis, infilled frames, and historic buildings. He is specialized in advanced numerical modelling of structures and also various types of laboratory and in-situ testing methods.
Additional affiliations
September 2009 - May 2017
Education
September 2020 - September 2020
Publications
Publications (116)
The construction industry is expected to be transformed due to its significant contribution to the consumption of natural resources, emissions, and solid waste. Despite its slow progression in achieving sustainable development goals (SDGs), in recent years, engineers have been adopting several techniques to address sustainability issues. Among the...
The advancement of geopolymer concrete technology presents a sustainable solution to address the challenges associated with the significant carbon footprint of the construction industry. This research uses machine learning methods to predict the compressive strength of fly ash-based geopolymer concrete using a wide range of experimental results. Fu...
This study evaluates gravity‐induced progressive collapse performance and damage mitigation strategies in modular steel buildings (MSBs) A typical three‐dimensional six‐story structure was modeled and analyzed using the finite element method, focusing on the instantaneous removal of a corner module. The study includes a parametric evaluation of the...
This paper presents an exploratory parametric study on the flexural capacity of an innovative cold-formed steel (CFS) stacked built-up beam section. The built-up section consists of lipped channel sections mounting vertically and screwed together through their lips and webs. Using the Direct Strength Method (DSM), a parametric study of this section...
In this study, two formulations have been suggested for the calculation of the shear capacity of stiffened steel plate shear wall (SSPSW) containing two rectangular openings by integrating verified finite element results, machine learning (ML) models, and gene expression programming. In this regard, a comprehensive nonlinear finite element analysis...
This paper reports a comprehensive study on the performance of the in-plane behavior of masonry walls. The use of wire rope and neoprene as a method for reinforcing existing masonry walls is proposed in this paper. The performances of the five walls with and without reinforcement were evaluated using experimental tests and numerical models. The fir...
This study employs soft computing techniques, including artificial neural network (ANN) models and gene expression programming (GEP), to enhance the prediction of ultimate load in timber pull-out tests under varying environmental conditions. A comprehensive dataset of 202 samples in normal environmental conditions and 324 samples under harsh condit...
The punching shear resistance mechanism of reinforced concrete slabs with glass fiber-reinforced polymers (GFRP-RC) is weaker than that of steel-RC slabs. The reduced shear strength and modulus of elasticity of GFRP reinforcement which led to greater tensile strains of the reinforcement and shallower compressive zone reduce the contribution of conc...
This paper aims to evaluate the seismic risk of the masonry school buildings located in the Tehran metropolis over the next 50 years and to prioritize them for seismic retrofitting toward optimal seismic risk mitigation. Tehran ranks among the world's largest cities facing a significant seismic hazard, and masonry buildings are identified as among...
This laboratory study investigates the effect of using steel and glass fiber reinforced polymer (GFRP) rebars in shear walls with aspect ratios less than two. The study evaluates six full-scale shear walls subjected to constant axial load and cyclic lateral loading, with aspect ratios of 1.08 and 1.75. The aim is to analyze how the use of steel and...
In this research a reliability-based method is proposed for the overlay design of flexible pavement. AASHTO’s method was used to compare with the proposed approach. According to the AASHTO procedure, the required overlay thickness was approximately half of that determined using the proposed method with an equal reliability level, while maintaining...
This research aims to predict the maximum shear capacity of Composite Steel Plate Shear Walls (CSPSWs) through nonlinear Finite Element (NLFE) analyses and Response Surface Method (RSM). The variables are concrete thickness and compressive strength, steel infill plate thickness, and yield stress. A parametric study was performed on CSPSW comprising...
Weigh-in-motion (WIM) systems provide the opportunity to measure the weight of vehicles, including individual axles, as they pass over the pavement. This study focuses on the evaluation of different WIM systems, the applications of WIM sensors, and the comparison of existing WIM sensors, particularly smart concrete sensors with
self-sensing capabil...
Glass fiber-reinforced polymer (GFRP) bar reinforced concrete structures are susceptible to bonding failure
because of the low bond strength between GFRP bars and concrete. In this study, four tree-based machine
learning models have been used to predict the flexural bond strength and failure mode of mat anchorage between
concrete and sand-coated...
This study aimed at understanding the role of vertical RC ties in the seismic performance improvement of confined masonry walls under combined in-plane, out-of-plane, and vertical loads through nonlinear static analysis. For this purpose, finite element models were developed using simplified micro modelling method which were verified against the ex...
Timber constructions face the challenge of degradation of wood and its connections when exposed to harsh environmental conditions, leading to a reduction in load-bearing capacity. It is essential to precisely estimate the load-carrying capacity of timber joints under such conditions to maintain the health and stability of the buildings. This study...
The aim of this paper is to determine the optimum amount of carbon fiber-reinforced polymer (CFRP) for strengthening columns in reinforced concrete (RC) frames suffering from weak column/strong beam condition. In this study, several parameters affecting the behavior of these frames including the level of columns’ axial force, Length and thickness o...
In this paper, the in-plane (IP), out-of-plane (OOP), and IP/OOP interactional behavior of masonry-infilled steel moment-resisting frames (MRFs) are investigated through calibrated finite element modeling and analyses. Some of the key parameters influencing the response of masonry-infilled frames (MIFs), namely panel aspect ratio, size of central w...
The lower bond strength of FRP bars to concrete compared to steel bars has remained an unsolved barrier to the widespread use of FRP-reinforced concrete under extreme loading. Additionally, the degradation of the bond between FRP reinforcement and concretes in aggressive environments adds to the existing concern. In this study, an innovative anchor...
The present study aims to determine the Rapid Visual Screening (RVS) basic scores for four representative Unreinforced Masonry (URM) and their corresponding Confined Masonry (CM) buildings. Two types of analysis were carried out on the finite element models: modal and push-over analysis. It was observed that confining URM walls with horizontal and...
Corrosion resistant FRP reinforced seawater concrete structures are attractive alternatives to conventional steel reinforced normal concrete structures. In this experimental study, the bond-slip durability of glass fibre reinforced polymer (GFRP) and steel bars embedded in seawater concrete after exposure to environmental conditions has been studie...
This study deals with the behavior of pre-cracked reinforced concrete beams exposed to a chloride environment. Three-point flexural tests were carried on 14 beam specimens. Damaged and undamaged concrete beams were exposed to chloride ions at different cycles in two manners, wetting-drying cycles and full immersion exposure conditions at the Persia...
Ordinary steel-reinforced elastomeric bearings (SREBs) are generally used for service loads. However, due to their inherent capacity and low demand of unreinforced masonry (URM) structures, they can also be used as an effective yet cost-efficient isolation system in URM buildings. To validate the improved performance of this system, a macro model o...
In the present experimental study, the effect of spiral transverse bars on failure mode and structural behavior of concrete shear walls reinforced with GFRP bars was investigated. Six full-scale shear walls in two aspect ratios (1.08 and 1.75) were tested under constant axial load and cyclic lateral loading. Two specimens were reinforced with longi...
Timber joints with glued-in rod connections provide an interesting technical solution for numerous structural applications, also under harsh environmental conditions; yet little research is available on this topic. This paper experimentally investigated the effect of exposure to seawater wetting/drying cycles and seawater wetting/drying plus UV rad...
Unreinforced masonry (URM) buildings are rather popular around the globe due to low construction costs, even though they can be prone to substantial damage caused by even moderate earthquakes. Numerous URM buildings that have experienced damages from past earthquakes require to be upgraded or at least return to their undamaged state in order to be...
In this paper, a post-earthquake damage assessment method for 11 different structural systems is proposed. The method is mainly based on residual inter-story drift ratios of all structural elements in the building, an important response parameter due to its simplicity of measure after the earthquake. nearly 2000 test specimens representing structur...
Cold-formed steel (CFS) Tab connections are popular due to their rapid fastening and ease of installation, and their applications have increased recently in Pacific countries, including Australia and New Zealand. This type of connection consists of a Tab plate formed from the web of the supporting beam and is screwed to the joist web, providing a d...
This paper presents the results from an experimental and numerical study on the effects of square openings on Steel Plate Shear Wall (SPSW) systems. For this purpose, seven specimens were tested under quasi-static loading. In addition to a specimen with solid panel, the effects of the opening's location and size were studied through testing six spe...
In seismic design procedure, the idea of considering uniform inelastic behavior for all stories displaces materials from unnecessary locations to stories needed for damage reduction and leads to a more economic design. In this paper, a parametric study was done to assess the seismic performance of structures designed based on uniform ductility patt...
Unreinforced masonry structures are a common building type in Iran due to the low cost of the materials and constructions, yet, deficiencies were noted in recent years regarding its' performance against strong earthquakes. Due to the importance of serviceability in building such as schools and governmental institutions, repairing the said structure...
In this research cyclic performance of a newly developed energy dissipating device is investigated through finite element studies. The device is constructed using yielding steel Cushions and bond-ed rubber cubes. The Cushions dissipate the induced energy of earthquakes while the rubber cubes provide lateral constraint and post-elastic stiffness for...
This study deals with the behavior of reinforced concrete beams exposed to elevated temperatures having different pre-existing damage levels. Three-point flexural tests were carried on 15 beam specimens, having three levels of pre-existing damages and exposed to room temperature and elevated temperatures of 200 °C, 400 °C, 600 °C, and 800 °C, to de...
This study examines the use of timber as a filler material for steel and pultruded GFRP tube elements and the performance of these sections is compared to solid timber columns, hollow steel and hollow pultruded GFRP tube element after exposure to elevated temperature. In total, 102 specimens were fabricated and exposure to elevated temperature rang...
In this paper, the seismic behavior of masonry walls retrofitted utilizing the centercore technique was numerically investigated through calibrated finite element modeling and analyses. A parametric study was conducted considering control walls without retrofit and retrofitted walls with centercore rebars both anchored and not anchored to the found...
Seismic performance of a representative single-story confined unreinforced masonry school building in Tehran, Iran is evaluated by means of incremental dynamic analyses according to FEMA P-58 framework. For this purpose, fragility curves are derived for each of the constituent walls of the building. The in-plane behavior of the walls is considered...
This paper presents the results of evaluating the effects of the location and size of rectangular opening on the cyclic performance of steel plate shear wall (SPSW) systems through an experimental study. A total of seven 1:6 scale SPSW specimens were tested under quasi-static cyclic loads. Apart from a solid (without opening) specimen, six specimen...
A B S T R A C T
In this study, nonlinear finite element (NLFE) analysis is conducted to determine the maximum shear capacity (Vmax) of stiffened steel plate shear walls (SSPSW) with rectangular openings. Results of a wide range of para-metric study are presented using developed response surface method (RSM), which quantified the effect of prominen...
This study aims to propose a multi-strut macro-model, capable of simulating the overall force-displacement behaviour of infilled frames with various opening configurations. For this purpose, the results of finite element modelling calibrated against several experimental data are employed to determine the characteristics of a multiple-strut model fo...
Ammonium polyphosphate (APP) is one of the most widely used halogen-free flame retardant, added in various resins to improve the fire properties, such as flame and smoke spread ratings and LOI, of fiber-reinforced polymer (FRP) composites. This paper experimentally investigates the effects of using APP, as a fire-retardant filler, on mechanical pro...
This paper presents the results of a series of shake table tests carried out on a half-scale single-story unreinforced masonry building with asymmetric openings. First, the unretrofitted building is subjected to seven increasing steps of bidirectional seismic excitation. The damaged building is then rehabilitated using steel mesh and shotcrete laye...
Unreinforced masonry is the most common form of building construction in Iran and many other countries. In developing countries, this type of building is being constructed for residential or educational uses, mostly regardless of engineering design schemes and principals. Previous observations indicate problems such as improper seismic resistant sy...
Presentation for the 'Experimental study on seismic behavior of masonry buildings retrofitted with shotcrete' conference paper
Since it is not possible to determine the exact time of a natural disaster's occurrence and the amount of physical and financial damage on humans or the environment resulting from their event, decision-makers need to identify areas with potential vulnerability in order to reduce future losses. In this paper, a GIS-based open source software entitle...
The Shrine of Prophet Daniel, located in the south-western part of Iran, represents one of the great examples of the pure brick cultural heritage buildings. This study summarizes the historical background of the shrine building. The structural parts of the building are covered in detail. The existing damages to different parts of the building are c...
Nowadays, the educational centers are regarded as one of the most important buildings in cities; therefore, in the present study, the geographical suitability of the existing schools in two districts (6, 12) of Tehran Metropolitan, Iran is studied using five standpoints including urban facilities, accessibility to urban road networks, population de...
Advanced Design Examples of Seismic Retrofit of Structures provides insights on the problems associated with the seismic retrofitting of existing structures. The authors present various international case studies of seismic retrofitting projects and the different possible strategies on how to handle complex problems encountered. Users will find tac...
In this paper, the results of field tests on a typical unreinforced brick masonry building representing a widely-used existing schools in Iran, are reported. The selected building is a single-story URM school with jack-arch roof. Considering technical and executive requirements, and geometry of arrangement of classrooms in the longitudinal directio...
This paper is the second part of a field testing on a representative masonry school building. Following the unreinforced masonry building specimen, static cyclic testing is performed on a confined masonry building exactly duplicating the corresponding latter specimen. Compared to the previous specimen which is presented in the first part of these p...
Characteristics of connections in steel moment-resisting frames are of utmost importance in determining the seismic performance of these structural systems. The results of several previous experimental studies have indicated that Partially-restrained (PR) connections possess excellent properties, which make this connection a reliable substitution f...
After the M7.3 Kermanshah-Iran earthquake on November 12, 2017, an initial estimate was made of the number of school buildings affected by the earthquake that were expected to cause serious failures. Further, while visiting the quake-stricken area, an illustrated report was prepared of the extent and type of damages of the school buildings in the r...
Gonbad-e Qabus, with a height of 52.8 m that makes it the tallest pure-brick tower in the world, located in the northern part of Iran, represents one of the most magnificent structures of the early Islamic centuries. This structure is still standing among the chaos of urban life and construction, catching the eyes of beholders even from far distanc...
This paper addresses the behavior of confined masonry walls with dominating shear failure mode in walls. For this purpose, failure modes of these walls are classified in details. For each failure mode, complete set of analytical-based relations for deriving parameters related to backbone curves is introduced. Calibrated finite element analyses are...
This paper presents in-depth results of a proposed strut model for masonry infill walls in moment-resisting steel frames. The proposed model is based on the results of calibrated finite element analyses and hence gives realistic representation of infilled frames behavior. Comparisons are made between the results of the proposed model and other exis...
One of the most important undertakings of Iran in reducing the seismic vulnerability of the country against earthquakes is dedication of more than 4 billion dollars to reconstruct the seismically dangerous school buildings and retrofit the vulnerable ones. "Organization for Development, Renovation and Equipping Schools of Iran (DRES)" is the sole o...
Most seismic design codes accept heavy damages to buildings in case of large earthquakes, provided that they are prevented against collapse. However, this leads to unacceptable consequences, such as very large volume of the required reconstruction works, in large populated cities. One way to get rid of these adverse consequences is using the idea o...
This paper presents the results of an experimental work in order to evaluate the performance of a novel proposed retrofitting technique on a typical dome-roof adobe building by shaking table tests. For this purpose, two specimens, scaled 2:3, were subjected to a total of nine shaking table tests. The unretrofitted specimen, constructed by common pr...
In this article, the cyclic performance of an innovative precast beam-to-column connection is evaluated experimentally and numerically. Two full-scale beam-column cross-shape interior connection specimens named PF-1 and PF-2 are tested. By adding extra nuts to the connecting bolts, specimen PF-2 behaves in a more shear-dominant pattern and shows le...
This paper presents finite element modeling of a base connection with column base weak axis aligned asymmetric friction connection (WAFC) considering 3D solid elements, dynamic implicit analysis, and non-linear geometry. The hysteretic curve of the developed model is compared with results from five experimental tests covering a wide range of design...
The Al-Askari shrine, located in Samarra, Iraq, is a remarkable example of a building with ancient Islamic architecture and construction that was heavily damaged by massive bombings. The bombings were carried out by two separate terrorist attacks in 2006 and 2007. This paper summarizes the important undertakings in the identification of shrine buil...
This paper presents the results of a vulnerability assessment of the damaged Al-Askari shrine located in Samarra, Iraq by finite element analysis. Reliable material characteristics are derived using limited experimental data on this historical building in order to be utilized in the numerical models. It is concluded that the cracked piers are not v...
A national effort to upgrade seismic resistance of unreinforced masonry school buildings in Iran is summarized. Practical seismic mitigation solutions are emphasized for masonry buildings of this particular occupancy type, which may also be promising for other building types constructed of masonry in Iran, the United States or other countries. The...
In present study, the numerical simulations are conducted to estimate the in-plane response of adobe walls subjected to pseudo static cyclic loading based on the finite element code ABAQUS. The simplified-micro modelling approach is adopted, and an interface model reported in ABAQUS material library is applied as material model for zero-thickness i...
There are numerous studies on the behavior of Unreinforced Masonry (URM) walls in both in-plane (IP) and out-of-plane (OP) directions; however, few aimed at understanding the simultaneous contribution of these intrinsic responses during earthquakes. Undoubtedly, even a strong URM wall shows weakened capacity in the OP direction due to minor cracks...
It is about scoring the school buildings for retrofit project throughout Iran in a list. It is based on various parameters including the ratio of population to area, structural type, year of construction.
Most of the studies related to the modeling of masonry structures have by far investigated either the in-plane (IP) or the out-of-plane (OP) behavior of walls. However, seismic loads mostly impose simultaneous IP and OP demands on load-bearing or shear masonry walls. Thus, there is a need to reconsider design equations of unreinforced masonry walls...