Mahmud M.S. Dwaikat

Mahmud M.S. Dwaikat
An-Najah National University · Department of Civil Engineering

Ph.D.

About

39
Publications
83,305
Reads
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905
Citations
Introduction
Mahmud M. S. Dwaikat is an Assistant Professor in the civil engineering department at An-Najah National University (NNU). He received his BSc 2004 from NNU, MSc 2006 from Imperial College-London, and PhD 2010 from Michigan State University (MSU), US. He worked as a research associate at MSU 2010-2011, and as a teacher and researcher at TU-Delft, in The Netherlands 2011-2013. His research interests include steel structures under extreme and fire conditions, simplified design guidelines, simplified analysis procedures, and nonlinear finite element analysis
Additional affiliations
January 2013 - present
An-Najah National University
Position
  • Professor (Assistant)
January 2011 - November 2012
Delft University of Technology
Position
  • Teacher and Researcher "Docent"
May 2010 - December 2010
Michigan State University
Position
  • Research Associate "PDF"

Publications

Publications (39)
Article
Full-text available
We elaborate a SDOF time-domain model for elastic hysteretic damping, by modifying the viscous damping model to introduce an instantaneous correction factor that recursively depends on the state variables of the system, such that the response exhibits weak dependency on frequency, corresponding to a large array of engineering materials. The effect...
Article
Full-text available
A model that captures the weak frequency sensitivity of elastic hysteretic damping is proposed for the time-domain simulation of structures with multiple degrees of freedom (MDOF) under free or forced vibration. The model is based on a recently proposed modification to the conventional single degree of freedom (SDOF) viscous damping model, utilisin...
Article
Hysteretic damping of a material or structure loaded within its elastic region is the dissipation of mechanical energy at a rate independent of the frequency of vibration while at the same time directly proportional to the square of the displacement. Generally, reproducing this frequency-independent damping can be computationally complex and requir...
Article
Full-text available
Elastic hysteretic damping is defined as the dissipation of energy at a rate that is weakly dependent on frequency of vibration. In this article, we propose that the elastic hysteretic damping can be achieved by a simple modification to the viscous damping model. The proposed modification is based on computing an instantaneous correction factor tha...
Article
Achieving a certain limit of rotational ductility in retrofitted reinforced concrete (R.C) joints is very important in the design of earthquake-resistant structures. Strengthening of R.C joints using wraps of fiber-reinforced polymers (FRP) is a common attractive technique and has an effect on the ductility of such joints. This study focuses on dev...
Article
Full-text available
In the design of reinforced concrete (RC) beam-columns, provisions in some buildings codes and standards stipulate that if the slenderness of such members is less than a certain lower limit, the second-order effect can be neglected and the member is designed based on its cross-sectional capacity. Even though such lower limits were originally based...
Article
One considerable weakness in reinforced concrete (R.C) structures is the connection between beams and columns. Several researchers showed that R.C joints suffer brittle failure due to combined effect of loading on the joints. Therefore, the ductility of the beam-column joints in R.C structures is an essential factor to prevent sudden failure of the...
Conference Paper
Reinforced concrete structures are common in Palestine. One considerable weakness point in these structures is the connection between beams and columns. Several researchers showed that reinforced concrete joints suffer brittle failure due to combined effect of loading on the joints. Therefore, the ductility of the beam-column joints in reinforced c...
Article
Different approaches, originally developed for ambient conditions, exist in current codes and standards for incorporating the effect of moment–shear (M–V) interaction on the plastic-carrying capacity of wide-flanged (WF) steel sections. There is a lack of experimental and theoretical studies that address this issue under fire conditions. The curren...
Conference Paper
There is a lack of experimental and theoretical studies that address the plastic moment-shear (M-V) interaction capacity curves under fire conditions. The current paper presents a numerical study investigating the effect of fire exposure on the plastic M-V capacity curves of doubly-symmetric, wide-flanged (WF), hot-rolled steel sections. Validated...
Article
Full-text available
In recent years, the utilization of computer techniques in engineering application has become an irreversible trend. This is achieved through using computer as the device for modeling, analysis, and design. The study mainly has focused on the accuracy of the tributary area method for estimation load , as compared to finite element method by SAP20...
Conference Paper
This study describes the characteristics of a panel geometry obtained by a novel manufacturing process for the development of ultra-compact flue gas-water condensing heat exchangers. In this process two stainless steel sheets are prepared and stacked and then brazed together in a special pattern outlining a desired configuration of water ducts and...
Article
This study evaluates the adequacy of different methodologies to predict the plastic capacity and response caused by non-uniform thermal gradients through the depth of beam–columns that are loaded only axially at the centroid. Three models with different levels of complexity were used to evaluate the fire response of beam–columns under non-uniform t...
Article
In current practice, no special measures are applied for enhancing structural fire safety of steel bridge girders. Further, there is very limited information and research data in the literature on the fire resistance of structural members in bridges. In this paper, the fire response of a steel bridge girder under different conditions is evaluated u...
Article
For evaluating fire resistance of a reinforced concrete member, temperature profile in the cross section of the member is required. Current simplified approaches and design graphs do not yield reliable temperature predictions in rebar and concrete. In this paper, a simplified approach is proposed for evaluating cross-sectional temperatures in fire-...
Article
Double angle connections are frequently used in steel framed structures and these connections, during a fire incident, play a critical role in transferring forces between structural members. There is lack of understanding on the response of bolted double angle connections under fire conditions. In this paper results from a set of numerical studies,...
Article
In fibrous nano-composites, slip of fillers within the matrix comprises a major mechanism through which energy is dissipated. In the current study, a simplified model for predicting the elastic hysteresis of perfectly aligned unidirectional nano-composites loaded in the direction of the fibers is developed. The model, based on shear lag analysis an...
Article
A specially developed two-dimensional cohesive zone finite element (CZFE) scheme is applied to simulate the fracture and delamination phenomena that occur in spray-applied fire-resisting material (SFRM) on steel structures. A cohesive zone material model for the SFRM is introduced and utilized to model both the internal cohesion in SFRM and the int...
Article
Predicting the response of restrained beams under fire conditions is complex owing to the development of fire-induced forces and requires finite-element or finite-differences analysis. In this paper, a simplified approach is proposed for predicting the fire-induced forces and deflections of restrained steel beams. The method applies equilibrium equ...
Article
When exposed to fire, restrained steel members develop significant internal forces, and these forces transform their behavior from beams or columns to that of beam-columns. The current provisions for fire-resistance assessment of such beam-columns through P-M interaction equations are an extension to the ambient interaction equations. These fire de...
Article
Steel structures in building are to be provided with external insulation to delay temperature rise and associated strength degradation when exposed to fire. However, due to delicateness and fragility of some insulation systems, damage might occur in these insulation systems during their service life, and such damage can lead to rapid rise in steel...
Article
Fire tests were performed to investigate the mechanics and capacity of steel beam–columns that develop a thermal gradient through their depth when exposed to fire. Wide-flanged specimens were loaded axially and tested vertically in a furnace recently commissioned at Michigan State University. The placement of insulation simulated a realistic three-...
Article
The performance of connections is crucial for maintaining stability of structural system during fire conditions. In current practice, no special consideration is given to account for various high temperature effects, including fire induced forces, on the behavior of connections. To overcome some of the drawbacks in current design provisions and to...
Article
Full-text available
At room temperature, and at service load levels, creep has little effect on the performance of steel structures. However, under fire conditions, creep becomes a dominant factor and influences fire resistance of steel members. Under fire conditions, significant forces develop in restrained steel beams and these forces induce high stresses in the ste...
Article
Restrained steel members, when exposed to fire develop significant forces and this transforms the behavior of a beam (or column) into that of a beam–column. The load carrying capacity of such beam–columns is determined through axial and moment capacity curves (P–M curves). Codes and standards recommend the use of uniform average temperature for est...
Article
Full-text available
Fire is one of the most severe conditions to which structures can be subjected, and hence, the provision of appropriate fire safety measures for structural members is an important aspect of design. The recent introduction of performance-based codes has increased the use of computer-based models for fire resistance assessment. For evaluating the fir...
Article
Full-text available
Restrained steel beams, when exposed to fire, develop significant restraint forces and often behave as beam-columns. The response of such restrained steel beams under fire depends on many factors including: fire scenario, beam slenderness ratio, location of axial restraint at the supports, and high-temperature properties of steel. A set of numerica...
Article
Steel beam-columns under fire may fail by either complete plasticizing of the section or in a premature stability failure. The type of stability failure in beam-columns under fire ranges from local buckling of section (plates) to global buckling of the overall member. Lateral-torsional buckling of beam-columns is influenced by many factors includin...
Conference Paper
Restrained steel beams, when exposed to fire, can develop significant fire-induced restraint force. In most previous studies, the location of the fire induced restraint force was always assumed to be situated at the center of gravity of the beam cross section. In practice, the location of axial restraint force can vary depending on many parameters,...
Conference Paper
A simple approach is proposed for predicting inelastic deflections of simply supported steel beams subjected to fire conditions. In this method, the same equations used for calculating elastic deflections of beams at room temperature are used with an equivalent flexural rigidity. Simplified equations for the equivalent flexural rigidity are develop...
Article
Steel beams when exposed to fire develop significant restraint forces and often behave as beam–columns. The response of such restrained steel beams under fire depends on many factors including fire scenario, load level, degree of restraint at the supports, and high-temperature properties of steel. A set of numerical studies, using finite element co...
Article
Fire represents one of the most severe environmental conditions to which structures may be subjected and, hence, the provision of appropriate fire safety measures for structural members is an important aspect of design. The recent introduction of performance based codes has increased the focus on fire resistance evaluation through computer models....
Article
Restrained steel beams when exposed to fire develop significant restraint forces and often behave as beam-columns. The response of such restrained steel beams under fire depends on many factors including fire scenario, load level, degree of restraint at the supports, and high- temperature properties (including creep) of steel. A set of numerical st...

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