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Article
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This paper presents a nonlinear analysis procedure for the seismic performance assessment of deteriorated reinforced concrete bridges using a modified damage index. A finite-element analysis program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), is used to analyze deteriorated two-span simply supported reinforced co...
Article
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We estimate the hypocenter locations and the centroid moment tensor solutions of the shallow very-low-frequency earthquake (sVLFE) activity that occurred in the Kumano-nada region of the Nankai Trough megathrust zone in central Japan from December 2020 to January 2021. Using seafloor observation data, we examined the detailed spatio-temporal distri...
Article
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The S-wave velocity ( V s) structure of sediments and the uppermost crust in the landward slope of a subduction zone are important for determining the dynamics of the overriding plate. Although distributed acoustic sensing (DAS) measurements have improved the horizontal resolution of V s structure in marine areas, the estimations have been limited...
Article
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Direct-displacement based design (DDBD) approach is a significant development in structural fields to outdo the deficits of force-based design (FBD) for reinforced concrete (RC) frame buildings. In the current study, the inelastic behaviour of buildings designed by FBD and DDBD are investigated with numerical research. Four and eight-storied RC fra...
Article
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This paper presents the depth inversion of Rayleigh wave group velocity to obtain an S-wave velocity model from seismic ambient noise cross-correlation in western Java, Indonesia. This study utilizes the vertical component data of a temporary seismograph network deployed in 2016, which was used in a previous study to estimate fundamental mode Rayle...
Article
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Masonry is a prevalent human chronicle substance used all over the globe as it offers significant advantages concerning building execution time, consumption, and costs despite being an engineered material manufactured using naturally occurring resources. In burgeoning countries, in particular India, most of the constructions are forged using masonr...
Article
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This paper presents a state-of-the-art review on the available seismic upgrading techniques of existing masonry structures, which comprise a very common structural material including most of the surviving historic structures worldwide. Due to their increased age and vulnerability, masonry buildings and structures are generally in greater need of st...
Article
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The rocking response of freestanding building contents simplified as rigid bodies was usually investigated in two dimensions with ground motions as the input, while their three-dimensional (3-D) rocking response subjected to horizontal bidirectional floor motions needs further investigation in both deterministic and probabilistic views. In this pap...
Article
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Pore pressure plays a critical role in the hypermobility mechanism of landslides. In coseismic landslides, earthquake can further influence the variation of pore pressure. Among these factors, the dominant factor to explain the hypermobility mechanism of such coseismic landslides remains unknown. In this paper, considering the seismic loading and t...
Article
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The present investigation interprets the seismic and cost performance of scrap tyre rubber pad (STRP) bearings obtained from used automobile tyres to be installed in a developing country of a high seismic risk zone. As a consequence, Meghalaya, a state from India is selected for the research. The buildings vary in its construction quality such as p...
Article
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This study aims to investigate the effect of soil type on the minimum separation distance for low and mid-rise reinforced concrete (RC) buildings. 3696 nonlinear time history analyses were carried out using 56 different building pairs located on 3 different soil types and 66 different earthquake records. The minimum required seismic gap distances o...
Article
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The Stick model is a MDOF system composed of masses lumped at the story level, connected in series by nonlinear shear link elements suitably calibrated to simulate the interstory inelastic behavior. The model has been demonstrated to predict with sufficient accuracy the dynamic response of existing masonry-infilled RC structures in terms of damage...
Article
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Free-surface oscillations induced by seismic waves were observed in many harbors. These free-surface fluctuations could lead to damage in a wide range of forms, such as breakage of mooring systems due to excessive ship motions. The damage to moored ships and mooring systems will remarkably reduce their emergency capability to incoming tsunamis, pro...
Conference Paper
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It has been proven qualitatively that borehole tensor strainmeters (BTSM) could measure three surface-wave-induced strain components in the horizontal-normal plane. But strain waves are usually incident obliquely to borehole axis to induce not only horizontal-normal strain components but also the three other strain components in the plane of vertic...
Poster
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Supplementary energy dissipation has extensively proven, through research studies and practical applications, to be a viable strategy for protecting new and existing structures against non-structural and structural damage for low-to-high seismic intensity levels, so avoiding devastating economic and social consequences in the aftermath of an earthq...
Article
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To perform accurate seismic analyses of corroded reinforced concrete (RC) buildings, it is necessary to predict the bond-slip relationships to modify the moment-curvature relationships. In this study, empirical models were developed to predict the bond strength of corroded RC columns. Twenty-five RC columns were tested under combined cyclic lateral...
Article
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The performance of structural timber connections is of utmost importance since they control the global response of the building. A ductile failure mechanism on the global scale is desirable, especially in the design of structures in seismic areas, where dissipative components in which ductile failure modes need to be ensured are considered. Therefo...
Article
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The seismic fragility of the transfer and purging chamber in a nuclear power plant is assessed in this paper based on the incremental dynamic analysis method. Select the peak ground acceleration as the ground motion intensity measure, and select the compressive strain of concrete, steel plate stress, and peak displacement of the structure as the da...
Article
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The seismic response analysis of near-fault pulse-like ground motions is severely restricted due to the scarcity of pulse-like records. The requirement in regulations that the response spectra of artificial ground motions should be compatible with the target response spectrum makes the relevant studies more difficult. As a result, this study propos...
Article
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In seismic design methods, the damping modification factors (DMFs) are the important parameter considerations in structure design. This paper investigates the effect of closest distance, site conditions, earthquake magnitude, peak ground acceleration (PGA), and damping ratios (ξ) on DMFs to the vertical response spectrums. 195 sets of vertical grou...
Article
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The aim is to solve 2D dynamic problem in frequency and time domains for a flexible foundation resting in an elastic anisotropic half-plane with arbitrary geometry subjected to plane longitudinal P- and transverse SV-waves. The computational tool is based on the boundary integral equation method using frequency-dependent fundamental solution of the...
Conference Paper
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Seismic isolation is a proven strategy for protecting critical infra-structures from the damaging effects of design-level earthquake shaking. For seismically isolated highway bridges, the expected seismic performance is to provide limited service under a safety evaluation-level ground shaking with minimal to moderate damage. The behavior under extr...
Article
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Rocking walls continue to gain interest in seismic regions due to their ability of re-centering the building system after major earthquakes. However, they have low inherent damping, thus they are often supplemented with energy dissipating elements. A rocking wall supplemented with partially debonded longitudinal bars is named as a hybrid rocking wa...
Article
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Previous investigations have shown that water-pier interaction has a considerable effect on the seismic response of bridge piers in deep water. However, most of those studies assumed that the foundation is rigid and there are few studies on the hydrodynamic effects on the piers considering soil-structure interaction under earthquakes. To investigat...
Article
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Time- and depth-domain processing procedures were applied to seismic data acquired from shallow coastal areas using limited source-receiver offset ranges. A signal-to-noise ratio improvement strategy was applied in time-domain processing, and migration velocity analysis (MVA) with tomographic inversion was performed at every common image gather dom...
Article
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This research investigated the seismic behaviors of shear-insufficient reinforced concrete (RC) beams strengthened with high-ductility cementitious composite (HDCC). Six cantilever beams, including two reference beams, two beams strengthened with HDCC jacket and two beams strengthened with steel bar mesh-reinforced HDCC jacket, were subjected to cy...
Article
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Enhancing the seismic performance of based-isolated structures during a major earthquake event using inerter-based dampers emerges as a prominent research direction. However, analysis and optimization of based-isolated structures incorporated with inerter-based dampers considering both system nonlinearity and excitation uncertainty have rarely been...
Article
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Structures with asymmetric plans, disproportionate strength, and unequal mass distribution exhibit undesirable behavior during severe ground motion and initiate a collapse mechanism. The eccentricity in a building is a major factor that influences this behavior. To reduce eccentricity popular practices, such as steel braces, shear walls, seismic is...
Poster
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Fee free to submit your contributions to this special session. https://sites.events.concordia.ca/sites/shmii/en/shmii-11-montreal-2022/pages/63
Research
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Considerable development in earthquake resistant design has been taken placed in recent past. As a result Indian seismic code IS: 1893 has also been revised in year 2016. This paper presents the seismic load estimation for multistory RC buildings as per IS: 1893-2002 and IS: 1893-2016 recommendations. In present study G+12 and G+16 RC Ordinary Mome...
Research
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The abstract is an overview about the orientation of the shear wall for the multi-storied building or it is provided generally for the high rise towers. Generally the orientation of the shear wall proves to be helpful in the areas were the seismic action is more. In these areas it areas it helps to minimize the overall damages in the buildings. The...
Article
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Topography effect is involved in the liquefiable canyon ground, which will cause variations of canyon slope displacement and liquefaction zone. To capture these salient response characteristics, a series of two-dimensional plane strain finite element models are created with various canyon sizes. Single soil stratum and constant water level are cons...
Article
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Near field ground motion is found to be able to induce a larger seismic demand on structures, as concluded from velocity pulse observed by various researchers in the past. The pulse period (Tp) which can characterize velocity pulse is proven to have a significant influence on structural responses. This paper, therefore, develops a framework that ca...
Article
When buildings are exposed to earthquake sequence, damage aggravation is expected to occur. Although several studies report seismic vulnerability of reinforced concrete (RC) buildings under the mainshock-aftershock sequence, indicating damage aggravation due to aftershock, none, to the best of our knowledge, quantifies seismic vulnerability of buil...
Article
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A Dou-gong joint is one of the essential components in traditional Chinese timber structures. This work investigates the seismic performance of Dou-gong joints under cyclic loading through experiments and model calibration. Four full-scale joints were subjected to cyclic loading to study the failure mechanism and ability to dissipate energy. The te...
Article
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This paper presents the historical development of the vertical extensions of unreinforced masonry buildings in the Eixample district of Barcelona and their impact on the seismic behaviour. Existing masonry buildings of Eixample present significant seismic risk because, despite the low to moderate seismic hazard of Barcelona, they show a marked vuln...
Article
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The presence of irregularities in buildings is a matter of concern when it is subjected for devastating earthquakes. The sudden change in vertical or plan configuration in structure are bound to weakens of the structure. In the present study 6 types of models with different plan irregularity are analyzed by using ETABS v 18.1.1 software. The seismi...
Article
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A prolonged earthquake series hit the regions of Albania on September 21 and November 26, 2019, causing loos of live and extensive damage to the civilian structures. The main aim of this study is to investigate the structural and earthquake response of a template design, commonly encountered in the region, which was seriously damaged by the 2019 Du...
Article
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In modern day situation, increase in population growth has resulted in the requirement of shelter. Hence, the construction of multistoreyed buildings has increased. For durable construction, the study of impact of wind and seismic loads on the structure becomes compulsory. In this present study, a comparison of wind and seismic for a G+8 multistore...
Article
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In order to improve the applicability of precast bridge columns in high intensity zones, a precast segmental column, equivalent to the cast-in-place(CIP) column was proposed, in which the ultra-high-perfornce concrete (UHPC) was used to connect precast column components. Two 1/4-scale precast segmental bridge columns assembled with UHPC and one mon...
Article
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Recently, the ever-growing interest in the continuous monitoring of heart function in out-of-laboratory settings for an early diagnosis of cardiovascular diseases has led to the investigation of innovative methods for cardiac monitoring. Among others, wearables recording seismic waves induced on the chest surface by the mechanical activity of the h...
Article
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In recent years, high-speed railways in China have developed very rapidly, and the number and span of the railway bridges are keeping increasing. Meanwhile, frequent extreme disasters, such as strong winds, earthquakes and floods, pose a significant threat to the safety of the train–bridge systems. Therefore, it is of paramount importance to evalua...
Article
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The characterization of dominant frequencies is essential for tracking significant temporal variations during and between tremor episodes. In this work, we proposed a method for quantifying the dominant frequencies and their attributes. We applied it to characterize three tremor episodes recorded several hours before ash emissions at Copahue volcan...
Article
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High compressibility and poor shear strength properties of soft clayey foundation soils are problems to be dealt with in the design and construction of embankments or roads. The inclusion of geosynthetic at the embankment base is one of the ground improvement techniques used to construct roads or embankments over soft clayey subsoils. This article...
Article
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Petrophysical seismic inversion, aided by rock physics, aims at estimating reservoir properties based on reflection events, but it is generally based on the Gassmann equation, which precludes its applicability to complex reservoirs. To overcome this problem, we present a methodology based on the double-porosity Biot–Rayleigh (BR) model, which takes...
Article
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Quantifying the stress distribution or finding mechanically coupled areas on the plate interface is fundamentally important for conjecturing megathrust earthquakes that may occur in the future. Kinematically coupled areas, or slip deficit distributions, on plate interfaces were commonly estimated by geodetic‐data analyses. However, mechanically cou...
Article
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Seismic bearing capacity of strip footings in cohesive soil slopes considering various embedded depths is investigated in this study. Novel solutions using pseudo-static method and finite element limit analysis (FELA) with upper bound (LB) and lower bound (LB) theorems are presented. The influences of footing depth, slope angle, slope height, undra...
Article
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The present work deals with assessment of earthquake-induced displacement of the base restrained retaining walls (RW’s). A detailed and rigorous finite element (FE) investigation has been carried out following the shaking table experiments on a scaled-down RW model. The FE simulations were performed by conducting several nonlinear time history anal...
Article
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We propose a sparse regularization model for inversion of incomplete Fourier transforms and apply it to seismic wavefield modeling. The objective function of the proposed model employs the Moreau envelope of the ℓ0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \...
Article
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Topology optimization has been mainly addressed for structures under static loads using a deterministic setting. Nonetheless, many structural systems are subjected to uncertain dynamic loads, and thus efficient approaches are required to evaluate the optimal topology in such kind of applications. Within this framework, the present paper deals with...
Preprint
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In the present paper, the solution of the seismic data inversion problem through multi-objective optimization with NSGA II is addressed. The seismic inversion consists of estimating the slowness of rocks in the subsurface from the travel times of the waves through the transmitters and receivers of the seismic waves. The inversion process uses the m...
Article
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The recent surge in earthquake engineering is the use of machine learning methods to develop predictive models for structural behavior. Complex black-box models are typically used for decision-making to achieve high accuracy; however, as important as high accuracy, it is essential for engineers to understand how the model makes the decision and ver...
Article
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Seismic landslides cause heavy casualties and economic losses as well as severe damage to the geo-environment. In areas with frequent earthquakes, each seismic event could induce the occurrence of damage. The damage evolution in rock slopes is the key factor to trigger collapse or landslide. To investigate the damage evolution of rock slopes under...
Article
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In this paper, a new version of the improved multi-objective pathfinder algorithm optimization method is suggested to the reinforced concrete frames’ seismic retrofit using fiber reinforced polymer jacketing. This new algorithm is called The fractional‑order pathfinder algorithm. The optimization problem is determined by numerically effective and p...