Hossein Jahankhah

Hossein Jahankhah
International Institute of Earthquake Engineering and Seismology | iiees

About

33
Publications
6,613
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275
Citations
Citations since 2017
14 Research Items
169 Citations
201720182019202020212022202305101520253035
201720182019202020212022202305101520253035
201720182019202020212022202305101520253035
201720182019202020212022202305101520253035

Publications

Publications (33)
Article
Full-text available
Structural flexibility and soil nonlinearity have important effects on the rocking performance of structures. However, there are a limited number of studies taking into account the consequences of these attributes simultaneously. This paper presents a comprehensive parametric study performed to explore the key parameters affecting the behavior of d...
Article
This research proposes an output-only procedure to extract seismic input motion and identify systems with severe closely-spaced modes incorporating a partial system identification approach. The proposed framework employs new methods to detect free vibration portion of the response histories and clustering the candidate points to find the first mode...
Article
This paper presents how incomplete wall contact between the foundation side‐walls and the surrounding soil alters the foundation input motion (FIM) of rectangular rigid boxes. The foundations are considered to have square sections embedded in a homogeneous linear half‐space. The free‐field motion (FFM) is assumed to be a vertical propagating shear...
Article
This article investigates seismic demands of underground structures with a rectangular section in a two-dimensional framework subjected to complete passage of shear wave field of motion. The wave field is considered to have different incident angles with the structure. Using the finite element approach, frequency-dependent strain transfer functions...
Article
The uplift effects on the seismic demands of flexible SDOF structures rocking on a stiff surface were numerically investigated, under impulse excitations. The final results were represented in the form of spectra for the seismic demands including the foundation rotation angle, structural drift and base shear. Comparing the results indicated that as...
Patent
Full-text available
A method for estimating a displacement sequence of an object. The method includes mounting an optical marker on the object, exciting a plurality of optical sources of the optical marker, capturing a plurality of images, and extracting the displacement sequence from a first image of the plurality of images and a second image of the plurality of imag...
Conference Paper
Conventional methods for seismic analysis of underground structures, namely, equivalent static analysis, close formed solutions, and investigation under statically imposed deformation cannot reflect the difference of seismic behaviors under various excitation frequencies. On the other hand, although the time history analysis provides more accurate...
Conference Paper
Averaging method is one of the most commonly used approximation methods in calculating horizontal and rotational components of foundation input. As a pioneer of this technique, Iguchi presented the equations using the averaging method for calculating the input motion based on the surface ground motion vector and the traction on the foundation. Sinc...
Article
Full-text available
S‌o‌i‌l-s‌t‌r‌u‌c‌t‌u‌r‌e i‌n‌t‌e‌r‌a‌c‌t‌i‌o‌n i‌s a‌n e‌m‌e‌r‌g‌i‌n‌g i‌s‌s‌u‌e i‌n s‌e‌i‌s‌m‌i‌c d‌e‌s‌i‌g‌n o‌f s‌t‌r‌u‌c‌t‌u‌r‌e‌s. A‌c‌c‌o‌r‌d‌i‌n‌g t‌o t‌h‌e h‌i‌s‌t‌o‌r‌y o‌f t‌h‌e f‌i‌e‌l‌d, t‌h‌i‌s p‌h‌e‌n‌o‌m‌e‌n‌o‌n i‌s u‌s‌u‌a‌l‌l‌y s‌t‌u‌d‌i‌e‌d i‌n t‌w‌o s‌e‌q‌u‌e‌n‌t‌i‌a‌l p‌a‌r‌t‌s, i.e., k‌i‌n‌e‌m‌a‌t‌i‌c a‌n‌d i‌n‌e‌r‌t‌i‌a‌l i‌n...
Article
Full-text available
This research explores the effectiveness of the use of stiff diaphragm walls next to a rocking foundation through numerical simulation. This improvement technique is used as a means to increase in subsoil peripheral confinement and reduce rocking-induced settlement. The numerical model was verified by the centrifuge test of rocking shallow foundati...
Article
This study reviews possibilities of reducing the ordinates of foundation input motion by dictating partial contact of foundation side walls to surroundings. Here, the foundation is considered as a strip embedded inclusion with variable contact length to nearby medium. A newly proposed net input motion that replaced horizontal and rotational input m...
Article
Full-text available
Despite of the limitation in modeling infinite space, the finite element method (FEM) is one of the most used tools to numerically study the geotechnical problems regarding the capacity of simulating different geometries, conditions and material behaviors. A kind of absorbing layer named perfectly matched layer (PML) has been applied to modeling th...
Article
This investigation is coordinated for the case of strip embedded foundation with incomplete contact to surrounding medium to uncover some aspects of kinematic interaction. The extracted results of finite element analyses are presented in three stages. First, horizontal and rotational foundation responses besides a recently introduced net horizontal...
Article
Full-text available
In the field of soil-structure interaction (SSI), kinematic interaction (KI) can potentially be a source of notable influences on dynamic response. Such influences take place through alternation in free field motion (FFM) and result in new foundation input motions (FIM). In this paper, first the effect of KI on horizontal input motion, for the case...
Conference Paper
Full-text available
In the field of soil-structure interaction (SSI), Kinematic Interaction (KI) can potentially be a source of notable influences on structure dynamic response. Such influences take place through alternation in foundation input motion. In this paper, first the effect of KI on input motion for the case of single rigid strip embedded foundation with inc...
Article
Full-text available
The Endurance Time (ET) method is a time-history based dynamic pushover procedure. In this method, the structures are subjected to gradually intensifying acceleration called an acceleration function. Then, their performances are assessed from linear to collapse level based on the interval time through which they can satisfy the required objectives....
Conference Paper
Full-text available
Finite element simulations are widely used in soil-structure interaction (SSI) problems. It is usual that the semi infinite soil medium becomes truncated to a manageable size through artificial boundaries with finite degrees of freedom. However ambiguous points still exist in different aspect of reasonable modeling of such boundaries. This ambiguit...
Article
An effective procedure to incorporate kinematic interaction (KI) aspects in seismic analysis of soil–struc-tures systems was presented. In this regard, fi rst, the effect of KI on the structural response was investigated with special focus on the role of rocking component of foundation input motion (FIM). This was performed parametrically for a wid...
Article
The concept of equivalent linearization, in which the actual nonlinear structure is replaced by an equivalent linear single‐degree‐of‐freedom (SDOF) system, is extended for soil‐structure systems in order to consider the simultaneous effects of soil‐structure interaction (SSI) and inelastic behavior of the structure on equivalent linear parameters...
Article
Full-text available
The need for simplified physical models representing frequency dependent soil impedances has been the motivation behind many researches throughout history. Generally, such models are generated to capture impedance functions in a wide range of excitation frequencies, which leads to relatively complex models. That is while there is just a limited ran...
Conference Paper
Full-text available
One of the main steps involved in Soil-Structure Interaction (SSI) analysis is the evaluation of soil impedances. Thus, numerous studies have been done to calculate dynamic response of foundation through sophisticated numerical techniques. As an alternative, many researchers have focused on introducing simple physical models representing soil imped...
Article
Accelerograms recorded near active faults have some important characteristics that make them different from those recorded in far-fault regions. High-frequency components in acceleration records and long-period velocity pulses are among notable specifications of such ground motions. In this paper, a moving average filtering with appropriate cut-off...
Article
The effect of foundation embedment on fundamental period and damping of buildings has been the title of several researches in three past decades. A review of the literature reveals some discrepancies between proposed formulations for dynamic characteristics of soil-embedded foundation-structure systems that raise the necessity of more investigation...
Conference Paper
نویسندگان: سعید مهجوبی، میثم صمدی، حسین جهانخواه----- در آييننامههاي طراحي پلها اثرات برخورد عرشه به كوله عموماً به صورت مستقيم ديده نميشود. از جمله تبعات ثانويه اي كه اين پديده ايجاد مي نمايد مي توان به تخريب ديواره بالايي كوله، افتادگي عرشه و افزايش نيروهاي طلب در اعضاي مختلف و خصوصاً كوله ها اشاره نمود. تمهيداتي كه در آيين نامه ها براي مقابله با...
Article
Full-text available
The accuracy of dynamic parameters of soil-structure systems with surface and embedded foundations, proposed by FEMA440 regulations, is investigated in the elastic range. This is done through comparison of implicit transfer functions behind the regulations with those computed directly from a benchmark soil-structure model. The model consists of a s...
Article
The effect of soil conditions on strength reduction factors (SRFs) is investigated. Both site effect and soil-structure interaction (SSI) effect are considered in the study with special emphasis on the latter effect. The structure is modeled as an elasto-plastic single degree of freedom (SDOF) system, whereas the underlying soil is considered as a...
Conference Paper
Full-text available
3 SUMMARY Ground motion records close to ruptured faults possess special characteristics not seen in other ground motions. Directivity, fling step, notable vertical components and a band of grater (high) frequency content are remarkable ones of those characteristics. Thus, influence of such parameters on the response of structures has been the titl...
Article
Full-text available
This study is an investigation on Strength Reduction Factor Spectra (SRFS) including the effect of Soil-Structure Interaction (SSI). A wide range of non-dimensional parameters, which define the whole problem, are considered. The structure is replaced by an elasto-plastic Single Degree of Freedom (SDOF) model, whereas the underlying soil is modeled...

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