Ehsan Kashi
@iau-shahrood.ac.ir
shahrood
Islamic Azad University, Shahrood
Scopus Publications
Scopus Publications
Edris Soltani and Ehsan Kashi
Springer Science and Business Media LLC
Today, pedestrian traffic is highly regarded because every moving in any way will include walking partly, so improving the pedestrian walkways service level is considered very important. In this research, the service level of walkways and corridors of Sadeghiyeh urban train station in Tehran was examined by using two software, Aimsun and Path Finder. The pedestrian traffic volumes within the scope of the study are gathered through subway organization statistics as well as manual census in the study area. After simulating pedestrian traffic in the two above-mentioned software, the results, including traffic time, pedestrian density, speed, volume, level of service, etc., have been analyzed and the data of these two software are compared with each other. The simulation results also showed that some sections such as corridors, waiting platforms and ticket gates were not predicted based on the pedestrian volume in design year. Therefore, the need to reconsider these spaces is seen based on qualitative criteria for pedestrian (passengers). Final results show that the main hall level of service in the station is between D and E, the North Entrance level of service in station is C and the South Corridor LOS in the station between C and D.
Mehri Shahriari, Davood Feiz, Azim Zarei, and Ehsan Kashi
Springer Science and Business Media LLC
Store traffic and customer traffic flow are one of the factors affecting the store performance. By recognizing customers’ movement patterns within the store, companies can design interior layouts for the store, which can increase buyers' traffic, average transaction value, and profitability. In this study, the capacity of sections (stairs, special sales area, and checkout) was examined from a hypermarket in Iran. The data were collected through the store’s closed-circuit television films, and then, simulation was performed using the Pathfinder software, and the level of service each department was achieved. Based on the results of the research, the level of service of the store’s stairway was obtained C, which shows the level of service is a desirable stairway service. The level of service in the special sales and checkout area was achieved E, which according to the number of people per square meter, indicates the level of service undesirable for these sectors. Finally, based on results, solutions are provided to improve the quality level of service.
Hamed Kashian and Ehsan Kashi
Thomas Telford Ltd.
The design of sidewalks in crowded areas is of great importance in cities. These spaces are sensitive if they happen to be in a central business district (CBD). In this research study, the main objective is to analyse and design the sidewalk adjacent to the bazaar in Semnan, Iran, in a CBD, positioned in a historical location of the city. After surveying number of pedestrian sidewalks during peak hours in the morning and evening, the above-mentioned street was divided into eight parts, and the highest traffic flow was considered as a criterion for the design. Then, based on HCM2016, the density and the level of service (LOS) of each part were obtained. The findings indicated that part 4 had LOS E and density 11 < 11, 52 < 18, part 6 had LOS E and density 11 < 12, 06 < 18 and part 7 with the highest traffic volume of about 2500 people and LOS E was prioritised to increase LOS. The data obtained for each part were studied by PathFinder software and compared with the obtained manual information. Therefore, the road-diet theory was implemented. By increasing the width of the sidewalk by about 3–5 ft/section, there was a resulting improvement in LOS.
Sajad Hasheminasab and Ehsan Kashi
Emerald
Purpose In many coastal areas where there are problematic soils, pavement construction on the soil is difficult because of the low shear strength and high consolidated. Also, given that the container terminals constitute more than 70% of the port area and as pavement in these areas is subject to heavy loads due to the long-term container storage, wheels of transport and movement equipment, the pavement must tolerate a distributed loading of at least 4 ton/m2 in accordance with the type and weight of the containers imposed on the pavement. This study aims to investigate a variety of common pavement designs in coastal areas of southern Iran. The pavement type and characteristics of the subgrade layers are the same for each port; the thickness of different pavement layers is designed. Design/methodology/approach Due to problematic soil in the pavement subgrade, heavy and long-term container loading and the associated equipment, port pavement enjoys great importance. Findings The designed pavements are modeled by ABAQUS finite element software. The pavements are subject to a static load imposed by the corner casting container and resulted a distributed load 4 tons/m2. The results from data analysis show that the concrete block pavements influenced by the containers static loads of 3%–20% have less vertical displacement on the subgrade than other pavements (rigid and flexible). Originality/value This paper is modeling 3 port pavement in Iran. Based on field evaluation and simulation actual loading on pavement.
Mehri Shahriari, Davood Feiz, Azim Zarei, and Ehsan Kashi
Springer Science and Business Media LLC
One of the new topics that has attracted the attention of researchers in recent years is neuro-marketing. The purpose of the present study is to achieve an insight into the progress of studies on neuro-marketing through review of scientific articles in this field with methodology text-mining. A total of 394 articles were selected between 2005 and 2017 using the search for “neuro-marketing” in valid databases. By reviewing the title, abstract, and keywords at various stages of screening, the researchers selected 311 articles related to the neuro-marketing topic in order to carry out the text mining process. Then, pre-processing of data was performed and using cluster analysis, 6 optimal clusters were obtained according to Davis Bouldin index. Using the multi-attribute decision-making technique (SAW), the most important roots were ranked in each cluster. The results showed that interest in research on neuro-marketing has increased in recent years and clusters created around topics such as marketing strategies, advertising and video ads, ethical issues, advertising message components, neuroscience in marketing, economics and consumer behavior, and decision making and brand selection. The study shows that the researchers’ attention is moving from the concepts and principles of the use of neuroscience in marketing, economics and consumer behavior to design and develop marketing strategies using neuroscience.
Mohamad Javani, Ehsan Kashi, and Siros Mohamadi
Springer Science and Business Media LLC
Use of additive material in manufacturing asphalt mixtures has increased recently and, in some cases, it caused an improvement in the stability features of asphalt mixtures. Using waste material in manufacturing asphalt pavements not only prevents wasting national sources but also brings about positive environmental effects. In current research, functional features of hot mix asphalt of Semnan Asphalt Planet which contained w aste recycled glass and polypropylene are analyzed. Meeting the already-mentioned purpose, Marshall stability and flow test, indirect tensile test and dynamic creep test were used to analyze Asphalt Concrete AC mechanical properties. The most significant results show that using 0.2, 0.4, and 0.6 of fibers cause an increase in Marshall stability as 10, 7 and almost 1 percent and using recycled glass caused an improvement in Marshall stability to an amount of 2, 7.5 and 12 percent in comparison with the mix respectively. Besides, upon an increase in the quantity of recycled glass to 6%, the proportion of permanent deformations of asphalt samples decreases.
Milad Rahmati and Ehsan Kashi
Thomas Telford Ltd.
Urban footpath quality and pedestrian level of service is a popular subject for modelling and simulation in transport engineering. This paper reports an investigation into the capacity of footpaths...
Arash Azadpeyma and Ehsan Kashi
Springer Science and Business Media LLC
One of the main infrastructures in rail transportation is metro station. Obviously, analyzing and improving the capacity of the stations will ultimately lead to improved performance of the overall network. The capacity of metro station is the ability of the station and its associated spaces to create safety and comfort for the number of passengers expected to use the station. In this research, volume of passengers in the Shohada Square metro station has been used and simulated using VISSIM software. By the results of the simulation and regarding TCRP manual, six scenarios were analyzed in this research and different conditions were evaluated. Two main solutions for improving the performance of station were considered. It shows that the decision to remove the manual ticket purchase location will result in a 43% improvement in the performance of control space section and the approach to reducing the headway of trains from 240 s to 180 s will increase the amount of accessible space for each pedestrian in the platform to 35%. The method presented in this study can be used to evaluate and analyze other metro stations and even other transportation network stations.
Saeed Garmei and Ehsan Kashi
Informa UK Limited
Abstract Nowadays, pedestrians play an effective role on roundabout capacity and urban intersection. In this study, the results of stimulation and collaboration of Aimsun software are studied. First, the volume of pedestrians and passing vehicles is evaluated. The results showed that the average speed of pedestrian was 4.25 km/h, and the reaction time from the default of 1.35 s changed to 0.9 s. Also, the comparison results of the two moods showed that the average speed in the calibrated state decreased by 48% and the delay time decreased by 5%. Therefore, if the calibration of pedestrian movement is measured accurately.
Abbas Karimi and Ehsan Kashi
Informa UK Limited
Abstract Transport and communication are the major sectors of economy in any country, and this phenomenon is known as one of development indices of countries. Therefore, safety management and road accident reduction are taken into account as key issues. The first step for controlling road accidents is to identify the accident process and factors influencing it. In recent years, considerable researches have been conducted to perceive the relationship among number of accidents, traffic volume, road geometric parameters and environmental factors in the form of accident prediction models. These models are strong tools in analyzing accident and employed for identification and analyses of accident black spots in suburban roads. The use of prediction models obtained from the accurate statistical methods and information of roads and accidents not only are effective in evaluating the managerial and geometric corrections of roads but also make the identification of accident black spots easier and accessible. Present research tried to offer a model for investigating the effect of geometric parameters influencing safety promotion and accident reduction of suburban roads by the use of collected databases. Finally, effective variables have been used for modeling. Then, using statistical data and field work in the studied road, accident analysis models have been performed on them and effective variables have been identified. Also, measures have been conducted for solving problem and safety promotion of roads.
Gholamali Shafabakhsh, Ehsan Kashi, and Mojtaba Tahani
Emerald
Purpose Given the importance of airports and the need to develop this issue in runway, the purpose of this study, pavement response values under loading of different aircraft have been obtained using tire and pavement modeling by finite element method (FEM). To predict the actual behavior of pavements under aircraft loading, dynamic analysis of runway flexible pavement was performed using Abaqus software version 6.10. Design/methodology/approach The method is based on finite element analysis and software simulation. And the main goal to obtain the amount of pavement stress and deflection at different speeds. Findings The results of modeling showed that aircraft movement at a speed of 5-8 km/h leads to the highest stresses and deflections in the pavement. Moreover, the effect of elastic modulus variations of the asphalt concrete on the tensile strain under advisory circular layer was calculated for Airbus A380 by using FEM. To validate the results of the runway pavement dynamic analysis, the results of modeling have been compared with the field test results of National Airport Pavement Test Facility. Originality/value Stresses and deflections of pavement during aircraft movement at different speeds of 5, 8 and 20 km/h on the runway have been presented, and the critical points in length, width and depth of runway pavement, as well as the most critical speed of aircraft in terms of induced damage to the pavement, have been obtained.
Gholam Ali Shafabakhsh, Ehsan Kashi, and Abbas Akbari
Emerald
Purpose This paper aims to apply a pavement design by LEDFAA for a sample airport, and design results involving layer thickness, modulus and cumulative damage factor (CDF) achieved are shown in figures. Design/methodology/approach Finite element (FE) simulation is applied for sample airport pavement and based on results involving stress and strain, CDF amount is shown by using related equations. To analyze the accuracy of modeling, a comparison has been made between the values of ABAQUS and case study results at Denver International Airport (DIA). Findings The present study includes a comparison between the two conventional methods for runway pavement design. There is linear relation between layered elastic design (LED) and FE method results, so CDF rate achieved by the FE method is always smaller than the LED method. To assess the accuracy of the applied modeling with ABAQUS software, the validation was done using the deformations under the concrete slabs of DIA. The results are compatible with the results acquired from the case study, and the high accuracy of modeling was approved. This research shows that B-777 on rigid pavements and A-340-500/600 on flexible pavements have the most CDF contribution, among other aircrafts. Also, CDF rate for any aircraft in the LED method is higher than the FE method. Originality/value To assess the accuracy of the applied modeling with ABAQUS software, the validation was done using the deformations under the concrete slabs of DIA. The results are compatible with the results acquired from the case study, and the high accuracy of modeling was approved.
Gholam Ali Shafabakhsh and Ehsan Kashi
SAGE Publications
As the aircraft industry grows, different aircraft come onto the market which vary in terms of use (e.g., generic, military, commercial, and passenger), geometric shape of the wheels and main gear configuration. In this paper, LEDFAA software was used to investigate the effect of Airbus and Boeing gear configuration on rigid and flexible pavement of runways. Cumulative damage factor defined as the amount of the structural fatigue life of a pavement, which has been accumulated, was calculated for Airbus and Boeing aircraft in this research as well. To validate the numerical analysis in this study, cumulative damage factor curves were drawn using FAARFIELD software. The effect of gear configuration and lateral distance from centerline of runway were also evaluated and critical zones of runway were detected.This paper confirms advisory circular AC150/5320-16 about B-777. This advisory circular canceled airport pavement design in mixed traffic for the Boeing 777 aircraft. In other words, among Airbus group aircraft, A-340-500/600 has the most damage factor contribution on flexible and rigid pavements. This research also presents the structure of the new Federal Aviation Administration program for pavement thickness design. Sample results from the program are presented and compared with the results obtained from the existing Federal Aviation Administration design procedures.
Gholam Ali Shafabakhsh and Ehsan Kashi
Periodica Polytechnica Budapest University of Technology and Economics
According to the growing trend of aircraft industry, a variety of different aircrafts exist in the market which varies in types of use, geometric shape of the wheels and main gear configuration. In this paper, we used LEDFAA software for research about effect of Airbus and Boeing gear configuration on runways rigid and flexible pavement. Cumulative Damage Factor (CDF has been calculated for Airbus and Boeing aircrafts in this research as well. Also for validation of this numerical study, CDF curves were drawn by using FAARFIELD software. The effect of gear configuration and lateral distance from centerline of runway were evaluated and critical zones of runway were detected. This paper confirms AC150/5320-16 about B-777; that canceled airport pavement design in mixed trac for the Boeing 777 Airplane. In other hand, among Airbus group aircrafts A-340-500/600 have the most damage factor contribution on flexible and rigid pavements.