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Dive into the research topics where Ramin Vaghei is active.

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Featured researches published by Ramin Vaghei.


Journal of Material Sciences & Engineering | 2013

The Effects of Stacking Sequence Layers of Hybrid Composite Materials in Energy Absorption under the High Velocity Ballistic Impact Conditions: An Experimental Investigation

Elias Randjbaran; Rizal Zahari; Dayang Laila Abang Abdul Majid; Nawal Aswan Abdul Jalil; Ramin Vaghei; Ramin Ahmadi

In the current study, the effects of stacking sequence layers of hybrid composite materials on ballistic energy absorption, which were fabricated from Kevlar, carbon, glass fibres, and resin have been experimentally investigated at the high velocity ballistic impact conditions. All the samples have equal mass, shape, and density, nevertheless, they have different stacking sequence layers. After running the ballistic test in the same conditions, the final velocities of the bullets showed that how much energy absorbed by the samples. The energy absorption of each sample through the ballistic impact has been calculated, accordingly, the decent ballistic impact resistance materials could be found by conducting the test. This paper can be further studied in order to characterize the material properties.


Earthquake Engineering and Engineering Vibration | 2017

Development of a new connection for precast concrete walls subjected to cyclic loading

Ramin Vaghei; Farzad Hejazi; Hafez Taheri; Mohd Saleh Jaafar; Farah Nora Aznieta Abdul Aziz

The Industrialized Building System (IBS) was recently introduced to minimize the time and cost of project construction. Accordingly, ensuring the integration of the connection of precast components in IBS structures is an important factor that ensures stability of buildings subjected to dynamic loads from earthquakes, vehicles, and machineries. However, structural engineers still lack knowledge on the proper connection and detailed joints of IBS structure construction. Therefore, this study proposes a special precast concrete wall-to-wall connection system for dynamic loads that resists multidirectional imposed loads and reduces vibration effects (PI2014701723). This system is designed to connect two adjacent precast wall panels by using two steel U-shaped channels (i.e., male and female joints). During casting, each joint is adapted for incorporation into a respective wall panel after considering the following conditions: one side of the steel channel opens into the thickness face of the panel; a U-shaped rubber is implemented between the two channels to dissipate the vibration effect; and bolts and nuts are used to create an extension between the two U-shaped male and female steel channels. The developed finite element model of the precast wall is subjected to cyclic loads to evaluate the performance of the proposed connection during an imposed dynamic load. Connection performance is then compared with conventional connections based on the energy dissipation, stress, deformation, and concrete damage in the plastic range. The proposed precast connection is capable of exceeding the energy absorption of precast walls subjected to dynamic load, thereby improving its resistance behavior in all principal directions.


Modelling and Simulation in Engineering | 2016

Development of Constitutive Model for Precast Prestressed Concrete Segmental Columns

M. Hafezolghorani Esfahani; Farzad Hejazi; Ramin Vaghei; Ehsan Nikbakht; D. C. J. Tze

The interest of using precast segmental columns in construction of concrete bridges has significantly increased in recent years. One research area of concrete bridges is the application of Precast Prestressed Concrete Segmental PPCS Column in any structural analysis software or FE program code. Modeling a PPCS column, which consists of various materials with interaction between them, is complicated and time-consuming. This research attempts to formulate the stiffness matrix of PPCS columns in order to form the constitutive model in linear form to evaluate the response of the columns. A two-dimensional finite element model is presented in the finite element package ANSYS. Parametric studies are conducted by finite element models to verify the constitutive models for the PPCS column with a different number of concrete segments. Comparison between the constitutive model and the FE program results indicates that the constitutive model is accurate enough to predict the deformation of the PPCS columns.


APCBEE Procedia | 2014

Evaluate Performance of Precast Concrete Wall to Wall Connection

Ramin Vaghei; Farzad Hejazi; Hafez Taheri; Mohd Saleh Jaafar; Abang Abdullah Abang Ali


Archive | 2014

Experimental Study of the Influence of Stacking Order of the Fibrous Layers on Laminated Hybrid Composite Plates Subjected to Compression Loading

Elias Randjbaran; Rizal Zahari; Dayang Laila Abang Abdul Majid; Nawal Aswan; Abdul Jalil; Ramin Vaghei; Ramin Ahmadi


Computers and Concrete | 2016

A new precast wall connection subjected to monotonic loading

Ramin Vaghei; Farzad Hejazi; Hafez Taheri; Mohd Saleh Jaafar; Abang Abdullah Abang Ali


Archive | 2014

Scanning Electron Microscopy Interpretation In Carbon Nanotubes Composite Materials After Postbuckling - Review Paper

Elias Randjbaran; Rizal Zahari; Ramin Vaghei; Tower Block


Indonesian Journal of Electrical Engineering and Computer Science | 2014

Computing Simulation of Post-buckling in Functionally Graded Materials - A Review

Elias Randjbaran; Rizal Zahari; Ramin Vaghei


publisher | None

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Structural Engineering International | 2017

Simplified Damage Plasticity Model for Concrete

Milad Hafezolghorani; Farzad Hejazi; Ramin Vaghei; Mohd Saleh Jaafar; Keyhan Karimzade

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Farzad Hejazi

Universiti Putra Malaysia

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Hafez Taheri

Universiti Putra Malaysia

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Rizal Zahari

Universiti Putra Malaysia

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Ehsan Nikbakht

National University of Malaysia

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