Amirali Najafi

Amirali Najafi
Rutgers, The State University of New Jersey | Rutgers · Center for Advanced Infrastructure and Transportation

PhD
Research Associate at Rutgers University

About

11
Publications
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43
Citations
Introduction
Amirali Najafi is currently a research associate at the Center for Advanced Infrastructure and Transportation at Rutgers University.

Publications

Publications (11)
Article
Full-text available
Rapid structural inspections and evaluations are critical after earthquakes. Computer vision-based methods have attracted the interest of researchers for their potential to be rapid, safe, and objective. To provide an end-to-end solution for computer vision-based post-earthquake inspection and evaluation of a specific as-built structure, the concep...
Article
Full-text available
Civil infrastructure worldwide is subject to factors such as aging and deterioration. Structural health monitoring (SHM) can be used to assess the impact of these processes on structural performance. SHM demands have evolved from routine monitoring to real-time and autonomous assessment. One of the frontiers in achieving effective SHM systems has b...
Chapter
Full-text available
Railway bridges may experience large vibrations from passing trains if the load frequency of the train coincides with the natural frequency of the bridge. For long and slender bridges on high-speed lines, this may occur within the range of the operational speed. In combination with low inherent damping of the bridge, excessive vibrations during tra...
Article
Full-text available
Real-time hybrid simulation (RTHS) results from the integration of numerical modeling with experimental testing of structural systems. In substructured RTHS tests, a reference structure may be partitioned into two or more substructures to save cost and space. Researchers may choose to model the elastic and less critical structural components numeri...
Article
Full-text available
The dynamic response of railway bridges is important to consider, as the high velocity loading from the trains increases the risk of resonance. Increasing train speeds and loads result in a need for adaptable properties for railway bridges. One solution is to install magnetorheological dampers, as the response of the structure originating from movi...
Conference Paper
Full-text available
Dynamic laboratory testing is an integral part of our understanding of the performance of structural systems under earthquake loading. The two main approaches for dynamic testing have been shake table and pseudo-dynamic (PsD) methods. The shake table approach typically uses servo-hydraulic means to excite a moving base and an onboard structural sys...
Article
Full-text available
The interest in shake tables stems from a need to simulate earthquake behavior in laboratory settings. However, the inherent properties and nonlinearities associated with electromechanical and servohydraulic shake tables, combined with issues of table‐structure interaction, make accurate reproduction of earthquake acceleration time histories a chal...
Article
Full-text available
Hybrid simulation (HS) is a cost-effective alternative to shake table testing for evaluating the seismic performance of structures. HS structures are partitioned into linked physical and numerical substructures, with actuators and sensors providing the means for the interaction. Load application in conventional HS is conducted at slow rates and is...

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Projects

Projects (2)
Project
The main objectives of this project are the following: (1) develop and validate a reliable and efficient framework for three-dimensional, multi-axial, real-time hybrid simulation (maRTHS) testing; (2) enable the multi-actuator loading assembly to accurately impose three-dimensional dynamic boundary conditions on a physical specimen for realistic performance assessment of structural systems, especially for materials with rate-dependent behavior; and (3) provide sufficient guarantees for stable and robust maRTHS testing of physical specimens with different stiffness levels.