Mohammad M. Kashani

Mohammad M. Kashani
University of Southampton · Faculty of Engineering and the Environment

BSc(Hons) MSc PhD

About

117
Publications
44,921
Reads
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1,645
Citations
Citations since 2017
76 Research Items
1496 Citations
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Introduction
I am Associate Professor of Structural and Earthquake Engineering in Infrastructure Research Group in School of Engineering an the Environment at University of Southampton. I am also a visiting/adjunct Professor in Earthquake Engineering within Earthquake and Geotechnical Research Group at University of Bristol. Further Information is available @ http://mehdikashani.com/
Additional affiliations
January 2017 - present
university of southampton
Position
  • Professor (Associate)

Publications

Publications (117)
Article
Full-text available
Corrosion of reinforcing bars is the most common reason for the premature deterioration of reinforced concrete structures and bridges in a chloride laden environment. There are large numbers of existing reinforced concrete bridges in earthquake prone regions that are suffering from corrosion. Therefore, in this paper, the effect of corrosion on cyc...
Article
Full-text available
An application of Volterra series in nonlinear system identification is presented in this paper. This novel approach makes use of accelerometer data alone. The aim is to develop an algorithm that can rapidly detect damage, caused by earthquakes, in infrastructural systems without the need for a parallel transducer system that also monitors relative...
Article
Full-text available
This paper investigates the seismic performance and vulnerability of multi-span Reinforced Concrete (RC) bridges with unequal height piers exposed to varied corrosion damage scenarios. An advanced three-dimensional nonlinear finite element modelling technique is developed and verified with available experimental results of a reference shake table t...
Article
Full-text available
In this paper we explore the performance of RC bridge piers to seismic ground motion sequences, using both experimental and numerical models. Four RC columns were tested on the University of Bristol's shake table. These columns contained both well-confined and poor-confined cases. Spectrally matched by near-field without pulse (NFWP), near-field pu...
Article
Full-text available
Large sympathetic, resonance-like, structural behaviour to earthquake excitations with analogous frequency content often plays a critical role in determining its maximum seismic response. Earthquake excitation typically contains a broad spectrum of non-stationary frequency content, wave packets, which are difficult to observe from the recorded time...
Conference Paper
Full-text available
Application of precast post-tensioned segmental (PPS) bridge piers has increased in recent years in accelerated bridge construction (ABC). In order to increase the use of PPS piers in high seismicity regions, this work investigates the nonlinear behaviour of a segmental bridge pier with unbonded post-tensioned superelastic Shape Memory Alloy (SMA)...
Article
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This paper investigates the nonlinear dynamic behaviour and failure probability of multi-span Reinforced Concrete (RC) bridges supported on piers of unequal heights. To this end, a three-dimensional nonlinear finite element model of RC bridges with substructure irregularity is developed. The model is verified against an available experimental data...
Article
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Damage detection of bridge structures plays a crucial role in in-time maintenance of such structures, which subsequently prevents further propagation of the damage, and likely collapse of the structure. Currently, the application of machine learning algorithms are growing in smart damage detection of structures. This work focuses on application of...
Article
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A large part of Iranian railway bridge asset comprises masonry arch bridges, which have been in service for over 70 years. Seismic assessment of such structures is of great importance, particularly for high-seismic regions. Hence, this study assesses the seismic performance of Veresk masonry arch bridge, the longest masonry arch bridge of Iranian r...
Conference Paper
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In recent years, accelerated bridge construction (ABC) has led to substantial application of precast posttensioned segmental (PPS) bridge piers in bridge construction. However, PPS piers are not to be used in high-seismicity regions due to their low-energy dissipating capacity. To address this deficiency, this paper examines a segmental bridge pier...
Conference Paper
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This paper presents the preliminary results of an experimental investigation on the seismic performance of a large-scale typical Nepalese school URM wall. Hence, it proposes a retrofitting method for its strengthening. The test subjected a 5m x 3m masonry brick wall, set in 1:6 cement-sand mortar, to a two-way ramp cyclic loading to determine shear...
Article
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The use of precast post-tensioned segmental (PPS) piers is growing in bridge industry, particularly in Accelerated Bridge Construction (ABC). The PPS piers provides durable, low-maintenance and demountable accelerated bridge construction technique that could be resilient to natural hazards. To expand their application in seismic regions, it is esse...
Article
Full-text available
Chloride-induced corrosion is one of the most important reasons for the strength degradation of reinforced concrete (RC) bridges. As the piers of RC bridges are important element to sustain lateral loads, corrosion of columns in pier may lead to significant degradation. So it is necessary to have an appropriate evaluation technique to assess the ef...
Article
Full-text available
Two identical reinforced concrete (RC) bridge piers including a rectangular and a circular section are considered. The influence of corrosion damage, non-stationary characteristics of ground motions, and cross-sectional shape on nonlinear dynamic behaviour, failure mechanism and failure probability of these piers is investigated. An advanced modell...
Article
Full-text available
Precast post-tensioned segmental (PPS) bridge piers mitigate global and local damages of bridge structures through natural hinges (joints between their segments) and rocking motion of their segments. The application of the PPS piers is currently growing in Accelerated Bridge Construction (ABC) where the segments are manufactured offsite with higher...
Article
Resilience of infrastructure is characterised by its ability to quickly rebound to standard operation after a disrupting event. The bridges constructed using conventional techniques are not resilient to short-term threats (earthquakes, floods etc.) and deteriorate in the long-term. England’s strategic and local road networks have a net worth of £34...
Conference Paper
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This paper presents investigations on the dynamic behaviour of rocking steel frames that employ gap-opening mechanisms at the column-foundation and beam-column connections in order to avoid inelastic structural deformations under lateral loads. Current realizations of these structures incorporate supplementary energy-dissipation elements aimed at p...
Conference Paper
Full-text available
The application of precast post-tensioned segmental (PPS) bridge piers is growing in order to reduce global damages through rocking motion of the segments when subject to lateral excitations. However, local damages still exist in form of concrete spalling and crushing at the compression zones when one segment rocks on top of the underlying segment....
Article
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Aerial robotic technology has potential for use in a wide variety of civil engineering applications. Such technology potentially offers low-cost methods to replace expensive structural health monitoring activities such as visual inspection. Aerial robots also have potential uses in civil construction and for regional surveys. This paper presents th...
Conference Paper
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This paper presents the result of an investigation on the dynamic performance of Reinforced Concrete (RC) columns considering unidirectional and bidirectional excitations. For this purpose, an advanced nonlinear finite element method implementing the fibre beam-column model is used. Hypothetical rectangular and circular columns are considered to in...
Article
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Steel-concrete composite beams have been used in bridge construction for decades. Novel demountable bolted shear connectors, that allow bridge disassembly and offer high level of prefabrication, are proposed for the connection of the deck with the steel beams, as an alternative to the conventional headed studs. In terms of sustainability, bolted sh...
Article
Full-text available
The corrosion of steel reinforcing bars due to chloride ingress is the most common cause of premature deterioration of reinforced concrete structures. Stainless steel reinforcement in concrete is a promising solution to address these durability and sustainability issues as it is highly resistant to corrosion from chloride ions, and it does not rely...
Article
Full-text available
The deterioration and cracking of reinforced concrete (RC) bridges due to the chloride-induced corrosion of steel reinforcement is an inherently time-dependent stochastic phenomenon. In the current practice of bridge management systems, however, the determination of the condition states of deteriorated bridges is highly dependent on the opinion of...
Article
Full-text available
The current paper provides modelling guidelines for nonlinear analysis and fragility assessment of corrosion-damaged reinforced concrete (RC) structures. A systematic guideline is proposed to model the adverse impact of corrosion on mechanical properties of steel and concrete materials including the negative impact of corrosion on inelastic bucklin...
Article
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Ageing structures located in moderate to high seismicity regions are exposed to multiple natural stressors during their lifetime. Large earthquake events coupled with environmental aggressive agents increase the progressive failure probability of these structures. The accumulated damage during the main earthquake event might be exacerbated by its f...
Article
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This paper presents a numerical investigation on seismic performance of reinforced concrete (RC) cantilever columns under unidirectional and bidirectional excitations. The influence of cross-sectional geometry and multiple excitations have been examined in this study. An advanced nonlinear finite element model is employed to model different failure...
Conference Paper
Full-text available
The severe social and economic impacts of recent earthquakes have inspired a growing interest in smart structural systems that offer immediate post-disaster occupancy. Post-tensioned rocking frames are emerging damage-avoiding seismic-resistant structures that employ rocking joints at member connections (to avoid major damage to primary structural...
Conference Paper
Full-text available
The ultra-high-speed (UHS) Hyperloop is the next-generation mode of passen-ger/freight transportation, and is composed of a tube or a system of tubes through which a pod travels free of friction. The entire system must be supported by piers (multi-span viaducts), where the tubes act as the bridge deck. The UHS moving Hyperloops can exert large dyna...
Conference Paper
Full-text available
Application of post-tensioned segmental columns are increasing in accelerated bridge construction, where rocking motion of the segments results in lateral displacement of the column and the post-tensioning tendon provides self-centering capacity of the system. Analytical solution of such system is very complex as the equations of rocking motion are...
Conference Paper
Full-text available
Precast post-tensioned segmental (PPS) columns lower vulnerability of bridges because of natural hinges and rocking motion of the segments. The use of the PPS columns in bridge construction is increasing as high-quality segments are constructed offsite, and are rapidly put together onsite. Hence, the seismic performance assessment of the PPS column...
Article
Full-text available
The study presented in this paper describes the coupled influence of corrosion and cross-sectional shape on failure mechanism of reinforced concrete (RC) bridge piers subject to static and dynamic earthquake loading. To this end, two RC columns varied in cross-sectional shape and corrosion degree are considered. An advanced nonlinear finite element...
Article
Full-text available
The role of signal-based nonlinear system identification methods for the rapid post-earthquake damage assessment of reinforced concrete (RC) bridge piers is explored. Experimental data from the shaking table tests of six RC columns with and without corrosion damage are used as benchmark data. The specimens are excited under three different ground m...
Article
Full-text available
A set of benchmark, medium scale, shaking table tests on corroded reinforced concrete (RC) columns is conducted with the aim of investigating the effects of corrosion damage on the nonlinear dynamic behaviour of RC bridge piers. The experimental programme consists of an uncorroded control specimen and two corroded RC column specimens, with identica...
Article
Full-text available
Suitable numerical models of masonry structures are very important in their response evaluation under various loading events. Masonry is a heterogeneous material, made of mortar and masonry units, and joined together by interfaces. Constitutive models of mortar joints and masonry-mortar interfaces play a crucial role in achieving high-fidelity nume...
Article
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Post-tensioned rocking frames have been proposed as damage-free seismic-resistant structures. However, currently available load resisting systems for rocking frames rely on sacrificial yielding components that accumulate damage during strong dynamic action. To address this shortcoming, this study proposes a novel thoroughly damage-avoidance solutio...
Article
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The next generation of ultra-high-speed (UHS) trains, known as Hyperloop and TransPod, are aerospace type vehicles designed to carry passengers. The UHS employs a vehicle capsule within a protected vacuum tube deck, supported by reinforced concrete piers (i.e. multi-span viaduct). The tube environment allows multiple UHS vehicles to run in parallel...
Article
Full-text available
Accelerated Bridge Construction (ABC) philosophy has resulted in extensive developments of precast post-tensioned segmental (PPS) bridge piers in the bridge construction. Currently, there is a significant paucity in the literature on nonlinear mechanics and dynamics of PPS piers. Hence, this wok numerically investigates the nonlinear static and dyn...
Article
Full-text available
This paper reports the results of a set of benchmark medium-scale shaking table tests to investigate the significance of the non-stationary characteristics of ground-motion on nonlinear dynamic responses and the structural damage of reinforced concrete (RC) columns. To examine the influence of ground-motion characteristics, four RC columns are test...
Conference Paper
Full-text available
p>A review of methods applicable to the study of masonry-infilled reinforced concrete frames (MIRCF), consisting both traditional and advanced solutions, and located in seismic zones is presented in this research. Firstly, this research presents a brief discussion about the main challenges on modelling the RC frames, masonry infills and interaction...
Article
Full-text available
The aim of this study is to investigate the dynamic performance of rectangular and circular reinforced concrete (RC) columns considering biaxial multiple excitation. For this purpose, an advanced nonlinear finite element model which can simulate various features of cyclic degradation in material and structural components is used. The implemented no...
Article
Full-text available
The current paper provides a comprehensive review of experimental studies on corrosion-damaged reinforced concrete (RC) components and the ability of current state-of-the-art numerical models to predict the residual capacity of these corroded RC components. The experimental studies on corroded RC components are classified into five different catego...
Article
Full-text available
A review of methods applicable to the study of masonry-infilled reinforced concrete frames (MIRCF), consisting both traditional and advanced solutions, and located in seismic zones is presented in this research. Firstly, this research presents a brief discussion about the main challenges on modelling the RC frames, masonry infills and interaction b...
Article
Full-text available
This research explores potential application of entangled wire materials as intermediate layers between segments of pre-tensioned segmental bridge columns. An ensemble of free-decay vibration tests was conducted on small-scale columns with various configurations of intermediate layers. Wooden blocks were used for segments and the entire system was...
Article
Full-text available
The rocking mechanism has been widely recognized as a beneficial technique to reduce structural damage arising from lateral excitations particularly earthquake loading, and hence, segmental pre-tensioned bridge piers have been recently emerged due to their self-centring property accompanied by accelerated construction of such structures. Hence, thi...
Article
Full-text available
The current paper provides a comprehensive review of experimental studies on corrosion damaged reinforced concrete (RC) components, and the ability of current state-of-the-art numerical models to predict the residual capacity of these corroded RC components. The experimental studies on corroded RC components are classified into five different categ...
Article
Full-text available
This work focuses on entangled wire materials as an option for use between segments of a novel self-centring bridge pier inspired from the human spine mechanism to increase energy dissipation capability of the pier in rocking. A comprehensive set of free-decay vibration tests was conducted on small-scale columns with and without entangled wire mate...
Conference Paper
Full-text available
The rocking mechanism has been widely recognized as a beneficial technique to reduce structural damage arising from lateral excitations particularly earthquake loading, and hence, segmental pre-tensioned bridge piers have been recently emerged due to their self-centring property accompanied by accelerated construction of such structures. Hence, thi...
Conference Paper
Full-text available
This research explores potential application of entangled wire materials as intermediate layers between segments of pre-tensioned segmental bridge columns. An ensemble of free-decay vibration tests was conducted on small-scale columns with various configurations of intermediate layers. Wooden blocks were used for segments and the entire system was...
Article
Full-text available
This note reports the results of 120 low-cycle fatigue tests on steel reinforcing bars with varying slenderness ratios at varying strain amplitudes. The failure modes of the fractured bars were investigated through analysis of the fractured mechanisms of bars. The results of experimental testing were used to update empirical models of low-cycle fat...
Article
Full-text available
Large earthquakes are rare natural hazards, having catastrophic impact on society due to loss of lives, damage to constructed facilities, and business interruption. Because of damage accumulation due to the main strong shaking, aftershocks potentially endanger the safety of residents and subsequently increase financial loss due to downtime and repa...
Article
Full-text available
This paper explores a proof of concept self-centring spinal column concept experimentally. The idea of the system is inspired by the mechanical interaction of the vertebral bones and intervertebral discs in human spine. Experimental tests are undertaken to explore whether a similar bridge pier system could be constructed to withstand seismic dynami...
Article
Full-text available
A probabilistic framework for seismic vulnerability analysis of corroded Reinforced Concrete (RC) frame structures is developed. An advanced nonlinear finite element modelling technique is used to accurately simulate the nonlinear behaviour of prototype corroded RC frames over their service life. Different sources of uncertainties including modelli...
Conference Paper
Full-text available
A summary of shaking table test campaign of three RC columns with different corrosion levels are reported. Accelerated corrosion procedure is employed to produce the desired corrosion level. This work aims to investigate the effects of chloride-induced corrosion on seismic behaviour of RC bridge piers located in a marine environment. The performanc...
Article
Full-text available
Rocking post-tensioned steel frames capitalise on the use of rocking joints, and unbonded post-tensioning strands to provide self-centring action. Investigations on the complex and unconventional nonlinear dynamics of tied rocking steel frames, exclusive of supplemental damping methods, are presently limited. Increasing levels of energy-dissipation...
Conference Paper
Full-text available
Crustal earthquakes are rare natural hazards, having potential of strong ground shaking of magnitudes up to 8.0. Crustal earthquakes occur directly beneath urban areas at shallow depths of 5 to 20 km, and therefore, they have the potential to cause significant structural damage and socio-economical loss. Following a mainshock, triggered seismic act...
Conference Paper
Full-text available
Current seismic codes and standards in practice aim at preventing collapse of structures but do not address serviceability and performance of the buildings after a major earthquake adequately. For instance, following a mainshock, ground motion activities, known as aftershocks, occur as a cluster, potentially causing incremental damage to structures...
Conference Paper
Full-text available
p>Modern code-conforming buildings have a high probability of surviving major seismic events without collapse, hence minimizing the number of casualties. Nevertheless, the risk of substantial post-earthquake economic losses remains high, as a consequence of inadequate damage prevention guidelines in current earthquake design codes. Rocking post-ten...
Conference Paper
Full-text available
This study reports a set of benchmark shaking table tests of four large-scale RC columns. Three of columns have identical design dimensions and details. They are subjected to three difference ground motions: (i) a near-field without pulse record, (ii) a near-field pulse-like record and (iii) a far-field record. All three records are spectrally matc...