Ahad Javanmardi

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Verified

Ahad verified their affiliation via an institutional email.

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• Doctor of Philosophy
• Professor (Associate) at Fuzhou University

This paper aims to address one of the primary sources of uncertainties during earthquakes in Integral Abutment Jointless Bridges (IAJBs): the backfill soil and its intricate interaction with the pile and abutment. To achieve this goal, quasi-static cyclic tests were conducted on three specimens: (i) a steel H-pile buried in balanced soil, (ii) a st...

This paper investigates the effects of sodium polyacrylate and polyacrylate-co-acrylamide superabsorbent polymers (SAPs) on the self-healing performance and corrosion resistance of steel rebar embedded in cracked and uncracked ultra-high performance concrete (UHPC) specimens in pure water and chloride seawater. The self-healing efficiency was asses...

Stay cables are one of the key elements of cable-stayed bridges and are characterized by lightweight, low inherent damping, and high flexibility. They are continuously subjected to small-to large-amplitude vibrations due to various types of dynamic loads that may, in the long term, cause fatigue and fracture problems for the cable system, and may e...

Structural control systems have gained popularity for the ability to reduce the structural vibration response of civil structures subjected to different types of dynamic loads. Passive, semi-active, active and hybrid control systems have been widely utilized in various types of structures. This article presents one of the most economical and yet th...

This paper investigates the effectiveness of a new hybrid passive control system on the seismic response of an existing steel cable-stayed bridge considering the pounding effect. The proposed hybrid passive control system comprises a seismic isolator and a metallic damper. The bridge is located in a high seismic zone and has suffered several damage...

Steel lazy-wave riser (SLWR) is one of the key technical components of offshore oil-gas production systems and is widely utilized in deepwater areas. On the basis of the vector form intrinsic finite element (VFIFE) method, this study develops a reasonable numerical model for the SLWR to investigate the effects of the buoyancy section on its mechani...

Water Distribution Networks (WDNs), as critical urban infrastructures, face heightened vulnerability to damage and failure due to aging systems and external factors such as environmental changes, operational demands, and urban development pressures. Accurate predictive integrity assessment for pipeline systems is crucial for implementing proactive...

This paper studies the effect of the diameter and number of bars on the cyclic behavior of the bar damper (BD). A BD is a metallic damper made of several steel bars welded between the bottom and top anchor plates. The energy dissipation mechanism of the BD primarily depends on the flexural yielding deformation of the bars under either unidirectiona...

In this study, the performance of superabsorbent polymers (SAPs) as self-healing agents in macrocracked ultra-high performance concrete (UHPC) was extensively evaluated, with a focus on compressive strength behavior in different aggressive environments. Three UHPC mixtures were designed: a control mixture, a UHPC with 0.3 % sodium polyacrylate (pol...

The corrosion resistance of ultra-high performance concrete (UHPC) with superabsorbent polymers (SAPs) submerged in deionized water, chloride saltwater, and compound saltwater was studied. The investigated mixtures included a control UHPC mixture and UHPC mixtures with 0.3 % sodium polyacrylates and 0.3 % polyacrylate-co-acrylamide. The corrosion p...

Dear colleague, To shed light on the importance of civil infrastructures, this special issue aims to promote the latest advancements in the field of SHM and smart materials for infrastructures to improve the infrastructures’ safety, sustainability, and performance. I warmly invite you to submit your papers (original research, review, or other t...

This study focuses on identifying damage in reinforced concrete (RC) beams using time-domain modal testing and wavelet analysis. A numerical model of an RC beam was used to generate various damage scenarios with different severities and locations. Acceleration time histories were recorded for both damaged and undamaged structures. Two damage indice...

The objective of this article was to investigate the potential for the dissolution and leaching of certain chemical elements from the protective mortar coatings of prestressed concrete cylinder pipe (PCCP) into drinking water in the event of leakage and how this might affect the overall quality of the water delivered to consumers. The mortars as li...

This study investigates the shear behavior of reinforced concrete (RC) beams that have been strengthened using carbon fiber reinforced polymer (CFRP) grids with engineered cementi-tious composite (ECC) through finite element (FE) analysis. The analysis includes twelve simply supported and continuous beams strengthened with different parameters such...

This study presents the effectiveness of a new metallic damper called bar damper (BD) in improving the cyclic performance of a semi-rigid frame. The BD consists of solid bars sandwiched between a top and a bottom plate. These solid bars dissipate the applied external energy through plastic deformations. To evaluate the BD effectiveness , a prelimin...

The girder, abutment and pile of integral abutment jointless bridges (IAJB) are integrated. In IAJBs, the backfill soil behind abutments is directly subjected to the horizontal cyclic displacements originated by the expansion and contraction of girders under thermal loadings. Meanwhile, the monolithic behavior of the abutment and pile of IAJBs caus...

In this paper, a quasi-static cyclic test was performed on an integral abutment-steel H-pile specimen considering the interaction of the soil with the abutment and pile in order to evaluate its seismic response. The results in terms of failure mechanism, deformation, earth pressure distribution, hysteretic behavior, backbone curve, stiffness, dampi...

Acquisition of vibration data using off-the-shelf equipment is a costly procedure, thus constraining the research and development in developing countries. In this research, micro-electromechanical systems (MEMS) accelerometers combined with an Arduino-based data acquisition system, were used to acquire vibration data of a reinforced concrete beam a...

Cities are becoming smarter in their functions; however, they are not necessarily resilient and able to survive the impact of disasters. An integrated, smart and resilient city is a quest for today and future sustainability that has been scarcely studied. Therefore, this current paper develops a comprehensive framework for re-evaluating cities’ sma...

The jointless bridges includes integral bridges, semi-integral bridges and extended deck bridges. The integral bridges adopts an integral abutment, and its main girder, abutment and pile under abutment are fixed together to bear the force together. The expansion joint and expansion device are cancelled, and the integrity, durability and driving com...

Every year, structural flaws or breakdowns cause thousands of people to be harmed and cost billions of dollars owing to the limitations of design methods and materials to withstand extreme earthquakes. Since earthquakes have a significant effect on sustainability factors, there is a contradiction between these constraints and the growing need for m...

S-lay and J-lay systems are progressively utilized for deepwater pipeline installation. The paper presents a simple and feasible model for the static and dynamic analysis of S-lay and J-lay pipelines. This mechanical model of the laying pipeline is established by the combination of the vector mechanics principle with the numerical technique based u...

Purpose This paper aims to develop a framework that could establish and further the terminology of smart city/resilient city discourse in that resilience could support urban “smartness”, a term that is widely argued being not easily measured nor quantifiably assessed. Design/methodology/approach The qualitative approach was employed, and based on...

In analysis of different types of dams, i.e. arch, gravity, rockfill and Roller Compacted Concrete (RCC) dams, the effect of hydrodynamic water pressure as an effective factor must seriously be taken into consideration. In present study, the hydrodynamic effect is precisely deliberated in RCC dams and compared to hydrostatic pressure effect. For th...

Min-Zhe bridge in Fu-Jian and Zhe-Jiang Provinces of China is a unique type of woven wooden arch bridge with important cultural heritage values in both tangible and intangible fields. Reconstruction (including in-situ rebuilding and relocation) is a traditional approach to extend the bridge’s lifespan, which has been passed on and lasts till now. T...

Purpose The study aims to use DfX to develop a comprehensive database of smart and resilient indicators that assists city administrators and authorities alike. The Smart and Resilient Cities Indicators Bank (SRCIB) will identify the level of smart and resilience determinants that will simultaneously provide ways to improve the city's infrastructure...

This paper presents a new metallic damper called hexagonal honeycomb steel damper (HHSD) for damage mitigation in structures subjected to earthquake excitations. The HHSD is composed of steel plates having several hexagonal and welded to the top and bottom anchor plates. The damper takes the advantages of hexagonal honeycomb geometry and steel mate...

The flexural pile foundation is used in integral abutment jointless bridges (IAJBs) in practical engineering to effectively dissipate the horizontal reciprocating deformation induced by the ambient temperature or earthquake loadings. Various types of flexural piles including the H-shaped steel pile (HP), prestressed concrete pile (PC), prestressed...

Featured Application A bolt-compression steel plate (BCSP) system is usually used for strengthening the flexural performance and improving the failure mode of over-reinforced beams and may easily be employed in normal design applications. This method is applicable for protecting sections against further deterioration and for strengthening. This met...

Purpose Over the past few decades, the flow around circular cylinders has been one of the highly researched topics in the field of offshore engineering and fluid-structure interaction (FSI). In the current study, numerical simulations for flow around a fixed circular cylinder are performed at Reynolds number (Re) = 3900 with the LES method using t...

Reinforced concrete construction is the most popular construction material so far and has significantly contributed to the constantly expanding infrastructure. Nonetheless, this material suffers from damage due to external loadings caused by temperature fluctuations, and dynamic and static loading. Many approaches have been investigated to detect,...

This paper presents conceptual design and development of a new hybrid precast beam-to-column connection. The hybrid precast connection is made of steel connection which is embedded in concrete beam and column. The beam and column are connected to each other by bolts connectors. The performance connection is evaluated through the quasi-static test....

This paper presents a new type of hysteretic metallic damper device, named bar damper (BD). BD is mainly made of three simple steel parts that includes top and bottom steel plates and a number of solid bars which dissipate input energy due to vibration loads through flexural yielding. Despite the simplicity of the damper, an optimized geometry of t...

Using appropriate material properties for analyzing different models in academic and commercially available finite element software is one of the main concerns for design engineers and researchers. This paper demonstrates the importance of using appropriate material properties for the models to be considered by engineers during finite element model...

A new yielding damper, called Bar Damper (BD), made of a number of solid bars sandwiched between two plates is introduced in this paper. Based on a simplified mechanical modeling, design parameters were formulated. The device is shown to have stable hysteretic behavior under cyclic loads. The device is capable of undergoing large displacements with...

This paper investigated the seismic retrofitting of an existing cable-stayed bridge through the use of a seismic isolation system. The bridge is situated in a high seismic zone. During the Saguenay earthquake 1988, one of the anchorage plates of the bridge supports failed. Herein, several configurations of seismic isolation system were considered t...

Nowadays, development of cable-stayed bridges is increasing around the world. The mitigation of seismic forces to these bridges are obligatory to prevent damages or failure of its structural members. Herein, this paper aimed to determine the near-fault ground motion effect on an existing cablestayed bridge equipped with lead-rubber bearing. In this...

Nowadays, development of cable-stayed bridges is increasing around the world. The mitigation of seismic forces to these bridges are obligatory to prevent damages or failure of its structural members. Herein, this paper aimed to determine the near-fault ground motion effect on an existing cable-stayed bridge equipped with lead-rubber bearing. In thi...

Nowadays, development of cable-stayed bridges is increasing around the world. The mitigation of seismic forces to these bridges are obligatory to prevent damages or failure of its structural members. Herein, this paper aimed to determine the near-fault ground motion effect on an existing cable-stayed bridge equipped with lead-rubber bearing. In thi...

A concrete damage model has been incorporated in finite element code ABAQUS as concrete damaged plasticity model to examine the sensitivity of the damage, as ABAQUS has the model that is capable of stiffness degradation in cracking which is the basis of fracture mechanics. Nonlinear constitutive relationships for concrete and steel have been incorp...

This paper aims to mitigate the seismic pounding effects on an existing steel cable-stayed bridge through the implementation of metallic dampers. The earthquake-induced pounding phenomena were reported on the bridge in 1988. To aid the aim, a finite element model of the bridge is created and the nonlinear time-history is performed to assess the imp...

In populous cities, construction of multistorey buildings close to each other due to space limitation and increased land cost is a dire need. Such construction methods arise several problems during earthquake excitation. ,e aim of this study is to investigate the bidirectional seismic responses of fully base-isolated (FBI) adjacent buildings having...

Passive energy dissipation devices have been successfully implemented in buildings around the world to reduce structural response, primarily due to earthquakes, but also for wind and other dynamic loading conditions. Passive systems do not require any external sources of power to operate and mitigate dynamic loading. The focus of this study is to p...

This paper proposes a new metallic energy dissipative device to mitigate structural damages under seismic excitations. In general, metallic dampers dissipate seismic energy through yielding. The inelastic cyclic deformation of the proposed damper, dissipates the seismic energy through yielding of the steel material. Herein, a three-dimensional fini...

This paper presents a state-of-the-art review of recent articles published on active, passive, semi-active and hybrid vibration control systems for structures under dynamic loadings primarily since 2013. Active control systems include active mass dampers, active tuned mass dampers, distributed mass dampers, and active tendon control. Passive system...

In this study, the seismic behavior of an existing steel cable-stayed bridge equipped with lead-rubber bearing subjected to moderate and strong earthquakes is investigated. The bridge is located at high seismic zone and experienced an earthquake in 1988 which caused the failure of one of its anchorage plate of the support. Herein, the bridge was mo...

This paper investigates the seismic performance of a base isolated cable-stayed bridge under earthquake excitations. The selected bridge is a steel bridge which has an overall length of 183.2m with 43m tall steel tower. Two-dimensional finite element models of the original and base isolated bridges are modeled by SAP2000 software. For this aim, The...

The number of Roller Compacted Concrete (RCC) dams has increased substantially during the last two decades primarily due to the advantages of RCC. The main challenging issue in the design of RCC dams is evaluating the RCC dams’ response during earthquake excitations. One of the effective factors in seismic response of RCC dams is hydrostatic pressu...

The number of Roller Compacted Concrete (RCC) dams has increased substantially during the last two decades primarily due to the advantages of RCC. The main challenging issue in the design of RCC dams is evaluating the RCC dams' response during earthquake excitations. One of the effective factors in seismic response of RCC dams is hydrostatic pressu...

ارتعاشات لرزه ای یکی از نگرانی های جدی برای سازه های بلند و باریک به ویژه در هنگام فجایع طبیعی مانند زلزله، باد،امواج دریا و طوفان است. خطر وقوع آسیبهای سازه ای را می توان با استفاده از سیستم های کنترلی جهت افزایش میراییسازه، کاهش داد. بنابراین، مقاله حاضر به (الف) بررسی رفتار یک قاب فولادی چهار طبقه قبل و پس از مقاوم سازی بامیراگر ویسکوز و(ب) تشری...

ارتعاشات لرزه ای یکی از نگرانی های جدی برای سازه های بلند و باریک به ویژه در هنگام فجایع طبیعی مانند زلزله، باد،امواج دریا و طوفان است. خطر وقوع آسیبهای سازه ای را می توان با استفاده از سیستم های کنترلی جهت افزایش میراییسازه، کاهش داد. بنابراین، مقاله حاضر به (الف) بررسی رفتار یک قاب فولادی چهار طبقه قبل و پس از مقاوم سازی بامیراگر ویسکوز و(ب) تشری...

The Finite Element Modelling (FEM) is widely used in various type of analysis by numerous researchers and engineers worldwide. In present study, a challenge is made to consider dams under seismic loading deliberating hydrostatic effect of reservoir water using nonlinear dynamic analysis. Therefore, it tries to take deepest section of dams in 2 and...

The Finite Element Modelling (FEM) is widely used in various type of analysis by numerous researchers and engineers worldwide. In present study, a challenge is made to consider dams under seismic loading deliberating hydrostatic effect of reservoir water using nonlinear dynamic analysis. Therefore, it tries to take deepest section of dams in 2 and...

The main objective of this study was to obtain the correlation between the severity of damage to the stiffness of the frame in the format of its intrinsic dynamic properties, the natural frequency of the structural system at damaged and undamaged state. In this research, a laboratory test was performed on the precast post-tension frame of a similar...

In our modern society, tall structures are an essential component of new civilization. These kinds of structures are sensitive to wind excitations due to their low damping and stiffness, and therefore large amplitude vibrations often happen under strong wind excitation. Focus of this study is a critical review of the research development on interac...