Mojdeh Asadollahipajouh

Mojdeh Asadollahipajouh
University of Nebraska–Lincoln | NU

Doctor of Philosophy

About

43
Publications
7,911
Reads
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87
Citations
Additional affiliations
January 2015 - May 2015
Texas A&M University
Position
  • Doctoral Teaching Fellow
Description
  • Taught the course CVEN 305- “Mechanics of Materials”
June 2014 - August 2014
Texas A&M University
Position
  • Laboratory Graduate Teaching Assistant
Description
  • CVEN 365 “Introduction to Geotechnical Engineering”
August 2011 - present
Texas A&M University
Position
  • Research Assistant
Description
  • Dissertation: Experimental and Numerical Investigation of Impact Loads on Group of Piles Sponsor: U.S. Department of State (DOS)

Publications

Publications (43)
Article
Soil-embedded vehicle barrier systems are frequently placed along high-speed highways to safely redirect errant motorists away from roadside hazards. Improved knowledge and understanding of the dynamic interactions between posts and soil are essential for advancing and optimizing these protective systems. Although the Finite Element Method (FEM) is...
Technical Report
The objective of this research effort was to evaluate the use of the Midwest Guardrail System (MGS) with reduced post embedment and potentially with reduced post spacing to satisfy Manual for Assessing Safety Hardware (MASH) Test Level 2 (TL-2) and TL-3 criteria when installed over low-fill culverts. The goal was to identify the shallowest post co...
Poster
Full-text available
Understanding dynamic impact post-soil interaction is vital for developing soil-embedded barrier systems, such as W-beam and thrie-beam guardrail systems, and approach guardrail transitions (AGTs). Development of improved modeling techniques to analyze the dynamic post-soil interaction is essential to reduce hardware development cost. Several simpl...
Article
Portable concrete barriers (PCBs) are commonly used to protect work-zone personnel and to shield motorists from hazards in construction areas. It is not uncommon to encounter longitudinal gaps within PCB installations resulting from the practice of constructing and connecting the barriers from different ends during setup or contractor operations. L...
Article
New top-mounted sockets for use with the weak-post, Midwest Guardrail System (MGS) on low-fill culverts were developed and evaluated. The system was adapted from the MGS bridge railing for attachment to the top slab of a concrete box culvert. Three design concepts were developed and evaluated through dynamic component testing. Both lateral and long...
Chapter
Work-zone traffic control devices, such as Type III barricades, must satisfy impact safety standards to improve safety and minimize risk for the motoring public traveling within work zones and on our highways and roadways. More specifically, this study focused on developing improved methods and products for addressing safety and mobility in work zo...
Article
Trailing-end guardrail anchorage systems are widely used by most state departments of transportation (DOTs) and generally consist of simple adaptations of crashworthy end terminals. The safety performance and structural capacity of these trailing-end anchorage systems, when reverse-direction impacts occur near the end, is imperative in crashworthin...
Technical Report
Full-text available
In 2013, a non-proprietary, trailing-end anchorage system with a modified Breakaway Cable Terminal (BCT) was developed by the Midwest Roadside Safety Facility (MwRSF) for the Midwest Guardrail System (MGS). Although this trailing-end, guardrail anchorage system adequately met the American Association of State Highway and Transportation Officials (A...
Article
Full-text available
Concrete box culverts are usually installed under roadways to allow water drainage without affecting the motoring public. Culvert openings can represent a hazard on the roadside when they do not extend outside of the clear zone, and often require safety treatments in the form of roadside barriers. In this study, a modified design of Midwest Guardra...
Conference Paper
A closed guardrail system, known as "bullnose" guardrail system, was previously developed to prevent out-of-control vehicles from falling into the elephant trap. The bullnose guardrail system originally used Controlled Release Terminal (CRT) wood posts to aid in the energy absorption of the system. However, the use of CRT had several drawbacks such...
Conference Paper
Full-text available
Cross-median crashes are the most severe type of run-off-road highway crashes. Cross-median crashes represent approximately 2% to 5% of all interstate crashes, yet fatalities and serious injuries occur in as much as 30% of these severe events. Many state departments of transportation (DOTs) install cable median barriers to mitigate the risk of thes...
Conference Paper
Full-text available
Guardrails, consisting of soil-embedded piles tied with a rail, are safety barriers that are installed along highways to shield errant motorists from roadside hazards and to minimize the risk of serious injuries. Soil resistance plays a crucial role in the way that guardrails perform when impacted by vehicles. Although the consequences of guardrail...
Conference Paper
Anti-ram perimeter barriers have been used as perimeter protection of facilities such as power plants, airports, and embassies against unrestricted vehicle access. One of the perimeter protection systems is soil-embedded piles installed as either single piles or an in-line group of piles. There exists a critical need to develop reliable design guid...
Article
Full-text available
The objective of this research effort was to mitigate the potential for floor pan tearing and penetration into the occupant compartment by modifying the posts utilized in a prototype cable barrier system. A series of dynamic component tests were conducted on the modified Midwest Weak Post (MWP). A bogie vehicle was equipped with a simulated floor p...
Article
Full-text available
The Midwest Pooled Fund Program has been developing a prototype design for a non-proprietary, high-tension, cable median barrier for use in a 6H:1V median V-ditch. This system incorporates four evenly spaced cables, Midwest Weak Posts (MWPs) spaced at 8 to 16 ft (2.4 to 4.9 m) intervals, and a bolted, tabbed bracket to attach the cables to each pos...
Article
Full-text available
A retrofit stiffening mechanism was developed for use in reducing the deflection of an F-shape portable concrete barrier (PCB) system without requiring anchorage of the barrier segments to the road surface. The research effort included development and analysis of mechanisms for limiting deflections through engineering analysis and finite element an...
Article
Full-text available
Portable concrete barriers (PCBs) are often used in applications where limited deflection is desired during vehicle impacts, such as bridge decks and work-zones. In an earlier study, a reduced-deflection, stiffening system was configured for use with non-anchored, F-shape portable concrete barriers and was successfully crash tested under Manual for...
Conference Paper
Full-text available
Poles are regularly placed along highways and are used to support signs, lights and electrical lines. The Midwest Guardrail System (MGS) is a standard W-beam guardrail system used throughout the United States to redirect vehicles that leave the roadway away from dangerous roadside obstacles, like ravines, water hazards, and bridge piers. Placing po...
Article
Full-text available
Cable barrier systems consisting of steel cables mounted on widely spaced weak posts are one of the most commonly used guardrail systems to protect errant vehicles from roadside hazards. When a vehicle impacts cable barrier, the cables are stretched producing tension forces that safely redirect the impacting vehicle. The estimation of the energy ab...
Article
Luminaire poles are commonly installed along highways to provide proper illumination in critical areas. When placing light poles in close proximity to guardrail, the poles may affect the guardrail's ability to safely contain and redirect vehicles. The interaction between a deflected guardrail system and a closely-positioned light pole may create un...
Article
Full-text available
Objective: Guardrail heights play a crucial role in the way that errant vehicles interact with roadside barriers. Low rail heights increase the propensity of vehicle rollover and override, while excessively-tall rails promote underride. Further, rail mounting heights and post embedment depths may be altered by variations in roadside terrain. An inc...
Article
Full-text available
Groups of in-line piles connected by beams are being used to contain errant vehicles for roadside safety and perimeter protection of sensitive infrastructure. The effectiveness of in-line groups of piles to safely redirect or stop approaching vehicles has not been well-investigated from the geotechnical point of view. In this paper, the performance...
Conference Paper
Soil embedded in-line piles are commonly used to redirect errant vehicles. The impact response of the soil embedded piles is governed by a number of factors including pile embedment depth, pile spacing, pile strength and stiffness, soil strength and stiffness, mass and velocity of the truck. The authors have developed a general and simple analysis-...
Article
Full-text available
Groups of in-line piles connected by beams are being used to contain errant vehicles for roadside safety and perimeter protection of sensitive infrastructure. The effectiveness of in-line groups of piles to safely redirect or stop approaching vehicles has not been well investigated from the geotechnical point of view. In this paper, the performance...
Thesis
Groups of in-line piles connected by beams are being used to contain errant vehicles for perimeter protection of infrastructures. Moreover, piles can be used as roadside safety devices resisting against impact loading. The effectiveness of in-line groups of piles to safely redirect or stop the approaching vehicles, however, has not been well invest...
Conference Paper
Full-text available
This paper presents a full scale test on a pile group as part of a study on the lateral behavior of groups of piles subjected to impact loads. In recent years, pile groups have been installed as an efficient system to protect structures such as bridge piers, offshore platforms and significant buildings against extreme horizontal loads from ships or...
Article
The water supply is the crucial problem of human beings in the world. Earth dams are usually the most important structures to store and manage the main sources: surface waters. The safety of earth dams in different conditions especially under earthquake loadings plays a vital role in sustainable developments. Recently, mixed-clay soil is widely use...
Conference Paper
Full-text available
This paper describes a study of the behavior of a group of piles under impact loading. Many structures such as bridge piers, offshore platforms or berthing foundations can be subjected to the horizontal impacts from ships during their lifetime in which the system failure would have serious consequences. Guardrails for road side safety are another t...
Article
Full-text available
The induced cracks on the concrete lining of the intake pressure tunnels may cause the water seep into the surrounding media leading to develop a hydro pressure on the external surface of the lining. In the common design practice، the lining can be designed to tolerate with this pressure using the Schleiss method. However، when the tunnel is constr...
Article
Full-text available
The number of constructed dams has been largely increased due to high demands of water supplies, and earth dams are the most common types since they are more compatible to the environment. Nevertheless, the stability of these important structures during earthquakes has to be carefully evaluated and guaranteed. In the past, earth dams usually design...
Article
Full-text available
Seismic site effect has been a major issue in the field of earthquake engineering due to the large local amplification of the seismic motion. This paper presents the importance of an appropriate soil behavior model to simulate earthquake site response and gives an overview of the field of site response analysis. Some of the well-known site response...
Article
Full-text available
L‌o‌c‌a‌l s‌i‌t‌e e‌f‌f‌e‌c‌t‌s p‌l‌a‌y a v‌e‌r‌y i‌m‌p‌o‌r‌t‌a‌n‌t r‌o‌l‌e i‌n c‌h‌a‌n‌g‌i‌n‌g (a‌m‌p‌l‌i‌f‌i‌c‌a‌t‌i‌o‌n o‌r d‌e-a‌m‌p‌l‌i‌f‌i‌c‌a‌t‌i‌o‌n) t‌h‌e s‌e‌i‌s‌m‌i‌c ‌h‌a‌r‌a‌c‌t‌e‌r‌i‌s‌t‌i‌c‌s o‌f g‌r‌o‌u‌n‌d m‌o‌t‌i‌o‌n‌s. T‌h‌e o‌b‌j‌e‌c‌t‌i‌v‌e o‌f t‌h‌i‌s p‌a‌p‌e‌r i‌s t‌o i‌n‌v‌e‌s‌t‌i‌g‌a‌t‌e l‌o‌c‌a‌l g‌r‌o‌u‌n‌d r‌e‌s‌p‌o‌n‌s‌...
Conference Paper
Full-text available
Seismic site effect has been a major issue in the field of earthquake engineering due to the large local amplification of the seismic motion. This paper presents the importance of an appropriate soil behavior model to simulate earthquake site response and gives a critical overview of the field of site response analysis. Some of the well known site...

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