Dina Mahmoud Mohamed Elsayed Mansour

Ayman H. Khalil

01/09/2023

https://www.civilejournal.org/index.php/cej/article/view/4294

Dina Mahmoud Mohamed Elsayed Mansour

15/08/2023

https://opencivilengineeringjournal.com/VOLUME/17/ELOCATOR/e187414952307140/FULLTEXT/

Dina Mahmoud Mohamed Elsayed Mansour

08/08/2023

https://trebuchet.public.springernature.app/get_content/7fd36a86-44d4-4adb-8057-c01351f23a87

Dina Mahmoud Mohamed Elsayed Mansour

22/08/2022

https://www.worldscientific.com/doi/10.1142/S2424862222500233

Dina Mahmoud Mohamed Elsayed Mansour

A Khalil, H Arafat

01/12/2019

The main purpose of this paper is to develop a model which is capable of assessing the overall condition of bridges as well as the condition of each element for the purpose of prioritizing maintenance strategies. The model will also be capable of ranking the bridges in a network according to their urgency of need for repair based on specific parameters. This paper explains how to achieve reliable assessment of a bridge starting with visual inspection and proceeding with the collection of information and carrying out in-depth investigations to achieve a reliable indication of the bridge's repair needs and its priority in the road network. The model is designed especially for bridges in Egypt as a typical example of a developing country. The methodology of the research was started by surveying the various inspection techniques of bridges. Then all probable defects, their causes and the appropriate repair techniques are identified and classified. After that, the experience and knowledge of bridge maintenance experts in Egypt were added to create evaluation criteria for reliable assessment model to prioritize maintenance strategy of bridges. This is incorporated via conducting questionnaires and interviewing those experts. The final outcome is a Bridge Overall Priority Indicator (BOPI) that ranks the bridges in a network according to their condition and maintenance urgency. The model is designed to be applied to the bridges in Egypt as it is based on the body of knowledge and expertise gained by maintenance and repair experts but it can easily be adjusted to suit any other country. Also the model is designed to cover specific bridge elements which are of major significance in bridge performance as described in this work while overlooking some, less important, elements. It has been observed that there is no effective bridge maintenance plan in most of the developing countries and that in most cases maintenance is carried out after an event has occurred and resulted in severe damage and caused a public outcry. Also developing countries have limited budgets for maintaining their assets. Therefore, it is very important to have an assessment criterion as a development tool to optimize the use of scarce maintenance budgets and get the most out of aging bridge networks.

Dina Mahmoud Mohamed Elsayed Mansour

Decision Support System for Optimal Bridges' Maintenance

01/10/2019

Bridges represent a significant percentage of the economy of many countries. They are a vital component of the country's road and highway network. Bridges are subjected to harsh environmental conditions throughout their service-life and consequently structural deterioration occurs. Asset managers are required to maintain networks in good service conditions and; in many cases with limited funds. The objective of this research is to develop a decision support system (DSS) for concrete bridges that provides assistance to the decision maker in evaluating and prioritizing the maintenance strategy of bridges. Thus, the decision maker can identify the urgency level of repair and select the optimal maintenance plan, either for a network of bridges, or on a single level, taking budget limitations into consideration. A comprehensive survey was conducted for data collection in order to build the system's database. This database includes different factors which are incorporated into the evaluation process. These factors include the bridge's defects, repair techniques and repair costs. Dynamic programing software was used to develop the optimal solution for the maintenance plan via creating a family of Pareto optimal alternatives for the DSS developed. A case study for DSS validation was implemented using Egyptian bridge networks. Results were also verified by questionnaire surveys sent to engineers working at the General Authority for Roads, Bridges and Land Transports who are dealing with Egypt's BMS. The responses to the questionnaires show that the developed DSS is comprehensive as it contains most of the critical parameters and its results are reasonable.

Dina Mahmoud Mohamed Elsayed Mansour

Hisham Arafat,, Ayman H. Khalil

01/06/2019

Bridges represent a significant percentage of the economy of many countries. They are a vital component of the country's road and highway network. Bridges are subjected to harsh environmental conditions throughout their service-life and consequently structural deterioration occurs. Asset managers are required to maintain networks in good service conditions and; in many cases with limited funds. The objective of this research is to develop a decision support system (DSS) for concrete bridges that provides assistance to the decision maker in evaluating and prioritizing the maintenance strategy of bridges. Thus, the decision maker can identify the urgency level of repair and select the optimal maintenance plan, either for a network of bridges, or on a single level, taking budget limitations into consideration. A comprehensive survey was conducted for data collection in order to build the system's database. This database includes different factors which are incorporated into the evaluation process. These factors include the bridge's defects, repair techniques and repair costs. Dynamic programing software was used to develop the optimal solution for the maintenance plan via creating a family of Pareto optimal alternatives for the DSS developed. A case study for DSS validation was implemented using Egyptian bridge networks. Results were also verified by questionnaire surveys sent to engineers working at the General Authority for Roads, Bridges and Land Transports who are dealing with Egypt's BMS. The responses to the questionnaires show that the developed DSS is comprehensive as it contains most of the critical parameters and its results are reasonable.

Dina Mahmoud Mohamed Elsayed Mansour

Hisham Arafat, Ayman H. Khalil

01/01/2019

It has been observed that there is no maintenance plan in most of the developing countries and maintenance is only conducted based on users' complaints or when significant structural defect is obvious to the public. Therefore, it is very important to have assessment criteriaof bridges as accurate evaluation is one of the most important and significant steps in any maintenance plan of bridges. The main purpose of this paper is to develop a criterion which is capable of assessing and evaluating the bridges, their overall condition and the condition of each element.Moreover,to develop a method that canrank the bridges in a network according to their repairing urgency. First of all different inspection typesare reviewed, then in order to obtain reliable judgment the experience and knowledge of the bridge maintenance experts in Egypt were added to the criteria by carrying out questionnaires and interviews with these experts in order to set the importance of each parameter in the evaluation criteria and the importance of each element of bridges. Finally obtaining a Bridge Overall Priority Indicator (BOPI) that ranks bridges in a network according to their condition and maintenance urgency. As a result, advancedapproach and accurate judgment to bridges is created through evaluating and assessing each parameter that may affect bridges. Also criterion that can help decision makers to rank the bridges according to their maintenance urgency is proposed

Dina Mahmoud Mohamed Elsayed Mansour

Hisham Arafat , Ibrahim Abdel Rashid

01/01/2013

Bridges construction are one of the most challenging construction projects around the world as it necessitates a lot of experience, equipment, and a huge deal of money. Consequently, it is indispensable to consider appropriately how to direct the monetary total spent on such projects. Currently the selection process of bridge’s superstructure construction methods in Egypt mainly depends on the experts’ knowledge and experience without performing or applying a systematic procedure. Thus the made decision might not be the most suitable one as some important considerations could be neglected. Recently box-girder bridges are considered as one of the most common systems of Nile bridges constructed in Egypt and it is also widely used all over the world. There are many methods of the construction of boxgirder bridges. Therefor in order to select the most appropriate construction method many factors should be well considered as site conditions, technology used, construction method characteristics and bridge physical characteristics. In this paper, a machine learning model is developed to determine the most appropriate box-girder bridge construction method, using the Value Engineering concepts, which is used for comparing the different construction methods for achieving the required basic function after considering the main significant factors and without affecting the desired quality.