Nour M Fayed

• Doctor of Engineering
• Professor at Ain Shams University

The ability of a structure to dissipate energy through inelastic behavior is reflected in the response reduction factor (R), which is influenced by redundancy, ductility, and overstrength. Accurate determination of R is crucial for seismic design. This study focuses on determining the response factor for reinforced concrete (RC) structures with var...

The structure's ability to release energy through inelastic behaviour is reflected in the response reduction factor (R). It results from a combination of redundancy, ductility, and over strength. Thus, determining R with accurate values plays a critical function in the process of seismic design. This study aims to determine the response factor of s...

At horizontal railway curves, the track is frequently subject to coinciding vertical and lateral wheel loads, which in some cases could be of high intensity. Currently, the influence of such loading pattern on the centre negative flexural response of prestressed monoblock concrete sleepers (PMCS) is not clearly analysed. As a result, the current co...

Prestressed monoblock concrete sleepers (PMCS) in railway ballasted tracks are the most recommended type of sleepers. They experience damage at an increasing rate with the increased demands for higher loads, train speeds, and traffic volume, concluding that an optimal design of this component will have a direct impact on the capital and maintenance...

This research attempts to investigate the effect of shear wall openings on the response reduction factor. Openings are commonly necessary because of other engineering disciplines’ requirements. When openings are modest in proportion to the size of the wall, their effects are frequently disregarded. On the other hand, when these openings are large o...

Monoblock prestressed concrete sleepers are the most dominant type of sleepers in ballasted railway tracks. As such, it is important to provide optimized designs to the concrete sleepers and the associated fastening systems to ameliorate railway safety and to save both capital and maintenance funds. Therefore, a three-dimensional finite element rai...

Reinforced concrete structural shear walls (RC Walls) have been recognized as a main effective lateral force resisting systems. Often, as result of the continuing evolution in the architectural engineering and the need to implement openings in shear walls. The effects of these openings are usually neglected when their sizes are relatively small com...

Explosions caused by standoff charges near buildings have drastic effects on the internal and external structural elements which can cause loss of life and fatal injuries in case of failure or collapse of the structural element. Providing structural elements with blast resistance is therefore gaining increasing importance. This paper presents numer...

Background: Terrorist bombing is currently regarded a threat to almost all countries around the world as it leads to loss of human lives, damage of structures and infrastructure in addition to serious negative impact on security and economy. Being the main carrying elements in skeleton structures, if columns are damaged or collapsed due to blast th...

Different mathematical F.E. models for a 5 story multi-bay Reinforced Concrete building have been analyzed for progressive collapse when subjected to the removal of one of its 1 st floor primary columns. The analysis was carried out through LS-DYNA which is a general-purpose finite element program that runs on a broad range of computing platforms....

Strengthening of columns using concrete jackets depends on friction at the interface between them. So strengthening of edge and corner columns in only one story needs a large cross section area due to the shortage of friction length which leads to architectural issues. This research aims to study strengthening the edge and corner columns using a co...

It has been observed that the seismic behavior of concrete structures is strongly influenced not only by the seismic response of the structure but also by the seismic response of the soil under the foundations. Several studies have been conducted to consider the analysis of the seismic response of the hollow concrete structure, including the struct...

Background: The purpose of using RC fences is to make a suitable distance between the explosion and the building, in order to reduce the damage that can occur in the building as much as possible, this distance is called stand-off distance. There are two common types of movable RC fences in Egypt, RC Curved and T-Shaped fences, which can be used to...

Presenting SHM "Structural Health Monitoring" techniques that are based on changes in modal characteristics for flexible structures such as cable-stayed bridges is one of the important challenges due to the importance of these structures in the society, taking into consideration the complexity of their dynamic behavior. In this paper, a proposed da...

Reinforced concrete (RC) structures are able to dissipate a large amount of energy during earthquake (EQ). RC structures designed to resist EQs must have enough strength and stiffness to prevent any possible collapse as well as to control deflection. Seismic codes include the response reduction/modification factor(R) in calculation of equivalent la...

In many countries and regions in the world, earthquakes are one of the most common natural disasters, which affect both human life and property. To avoid negative effects of earthquake, the nonlinear response of structures under dynamic loading should be accurately modeled to investigate their actual behavior under earthquake loading to ensure safe...

The response reduction/modification factor(R) is defined as an essential seismic design tool, usually used to specify the in-elasticity expected level in structure during earthquakes. The concept of response reduction/modification factor(R) depends on the observations that well detailed seismic framing systems can maintain large in-elastic deformat...

During the last few decades, it has been revealed that since earthquakes are one of the most common natural disasters, which affect both human life and property, hence design codes shall study all of its parameters that affect it from all sides. To avoid negative effects of earthquake, the nonlinear response of structures under dynamic loading shou...

This paper investigates the structural response of wide span structures where the primary structural system is cable-stayed roof, and aims at optimizing the design of such structures. Finite element analysis is carried out using commercial software taking into consideration the nonlinear formulation of cables. In order to check the accuracy and cap...

A numerical study for damage of RC columns under demolition blasting has been carried out and the results were compared with available experimental work. Basic considerations for the finite element method of the LS-DYNA Program are introduced. Equations of state models as well as three constitutive material models (the concrete mass, the reinforcin...

Fatigue has long been recognized as an important consideration for designing offshore structures and intensive cooperative industry research on tubular joints. In this paper, fatigue life assessment for single side welded tubular joints of fixed platforms is numerically assessed as part of mitigation for platform life time. The analysis procedures...

Current international specifications provide live load distribution factors for composite bridges. The factors do not account for change in straining actions due to skew angle, cross diaphragm presence, and continuity, consequently, resulting in inappropriate design. The objective of this paper is to evaluate the effects of the above parameters on...

The object of this paper is to investigate the response of guyed towers to earthquake loading using two methods of analysis: the response spectrum method and the time domain analysis using a step by step integration technique. A unified approach for linear and nonlinear structural analyses based on energy minimization of the total potential work of...

SHM "Structural Health Monitoring" and damage detection at the earliest possible stage is considered one of the most interesting issues of the civil engineering community, especially for those structures with long design life, life-safety implications and high capital expenditures like cable-stayed bridges. The EMA "Experimental Modal Analysis" giv...