Professor of Civil/Structural and Earthquake Engineering. Phone: +962 6 535 5000 x 22737 Address: Department of Civil Engineering
The University of Jordan
Amman 11942
Jordan
This study was designed to perform a detailed structural, paleostress, and seismicity analysis of... more This study was designed to perform a detailed structural, paleostress, and seismicity analysis of the Jordan Wadi Ibn Hammad dam site and evaluate the dam's vulnerability. Lithologically, the dam's left abutment was constructed on the Upper Cretaceous rocks, comprised of limestones, silicified limestones, chalk, dolomite, tripoli, and chert. The structure setup of the dam site is controlled by the Dead Sea Transform Fault System (DST), the ENE-WSW segment of the dextral strike-slip Siwaqa Fault, and the extensional NW-SE Karak-Fayha Fault. The stress tensor in the dam area indicates an NW-SE SHmax and NE-SW Shmin. Three main types of fracture trends were detected; a major trend of 0-10° which is compatible with the DST; a 60°-70° trend which coincides with the Siwaqa Fault; and a 120°-130° which coincides with the Karak-Fayha Fault system and the σ1 direction derived from the Tensor program. As a result, rocks are susceptible to rockfall and mass wasting. Therefore, it is necessary to adopt grouting to the bedrock and trimming to reduce rock instability. The risk of rock mass movement into the reservoir region during impounding is significant. Thus, trimming is required to reduce rock instability.
Over the past two decades, much progress has been made in research and application of the base is... more Over the past two decades, much progress has been made in research and application of the base isolation of structures as means of providing earthquake resistance to a structure. However, the trade-off between the extent of acceleration reduction and the response of a base-isolation system has not been given a serious consideration. This work uses a new material constitutive model for rubber bearing base-isolation system, which adopts the technique of real-time structural parameter modification. To achieve this, a finite element modeling and analysis are performed as a comparative study between a conventional totally fixed-base steel frame structure and similar base-isolated structures using rubber-steel bearings. The structures are subjected to the El-Centro, N-S earthquake. In order to include nonlinearity effects, a non-linear hyperviscoelastic material model has been used and linked to ABAQUS software as a user defined material subroutine (i.e., UMAT). Special connector elements...
Journal of Pipeline Systems Engineering and Practice
AbstractCulverts have been used to transmit surface drainage under roadways in place of typical s... more AbstractCulverts have been used to transmit surface drainage under roadways in place of typical short-span bridges because they provide an economical construction system. In this paper, a numerical...
In this study, an improved finite element formulation with a scheme of solution for the large def... more In this study, an improved finite element formulation with a scheme of solution for the large deflection analysis of inextensible prismatic and nonprismatic slender beams is developed. For this purpose, a three-noded Lagrangian beam-element with two dependent degrees of freedom per node (i.e., the vertical displacement, y, and the actual slope, $dy/ds
This study deals with the post-buckling behavior of an inextensible elastic prismatic cantilevere... more This study deals with the post-buckling behavior of an inextensible elastic prismatic cantilevered column of length L which is loaded by a cable attached at the tip of the cantilever and at mid-length and terminate at the fixed support. The post-buckling behavior of the column–cable system is solved analytically in terms of elliptic integrals using the principle of elastic similarity.It was shown that for a given prescribed angle of inclination for the lower segment of the cable, four equilibrium configurations exist with two of these are of symmetrical type. Moreover, in order to generalize the present study for n-segment column, the case of the three-segment column has been investigated. For such case, the results showed that eight post-buckling equilibrium configurations existed with four of these configurations as a symmetrical type. This study has several interesting engineering applications in ultra-lightweight aerospace engineering such as in solar sails technology, flexible robotics arms, biomedical instrumentation and it can be used as a flexible fixing rod in space technology.
This paper derives an exact analytical solution for determining elastic critical buckling pressur... more This paper derives an exact analytical solution for determining elastic critical buckling pressures and mode shapes for very long corroded cylindrical steel shells subjected to external pressure considering symmetrical and anti-symmetrical mode cases. ...
ABSTRACT: This paper presents an exact solution for large deflection behavior of nonprismatic can... more ABSTRACT: This paper presents an exact solution for large deflection behavior of nonprismatic cantilever beams of nonlinear bimodulus type material and subjected to tip concentrated moment. The highly nonlinear simultaneous first-order differential equations were solved analytically using the power series approach. Several numerical examples are carried out to investigate the effect of bimodulus properties, material parameter, n, and the applied tip moment on the large deflection behavior of nonprismatic cantilever beams. The numerical results show that the interaction (i.e., coupling) between the bimodulus material properties, the material constant, n, and the applied tip moment, plays a significant role on the large deflection behavior of cantilever beams. A comparative study with ADINA has been made to verify the accuracy of the presented analytical solution, and excellent agreement has been obtained. KEY WORDS: ADINA, bimodulus material, cantilever beam, large deflection, nonlin...
Significant quantities of slag are generated as waste materials or by-product from steel industri... more Significant quantities of slag are generated as waste materials or by-product from steel industries. They usually contain considerable quantities of metals. In this study, steel slag obtained from a steel factory in Jordan was used in Asphalt Concrete Hot Mixes (ACHM). Marshall specimens were prepared with 100% lime stone dense graded aggregates at 4.5, 5, 5.5 and 6% bitumen contents by weight of aggregate to serve as control specimens. Another set of Marshall specimens with 100% Steel Slag Aggregates (SSA) and another set with a combination of limestone and (SSA) were prepared using the same grading and bitumen contents. Test results showed a reduction in the Optimum Bitumen Content (OBC) and an increase in density and stability values for specimens prepared with 100% (SSA). A decrease in the flow, Percentage of air voids (Pav), and Voids in Mineral Aggregates (VMA) values - but in compliance with the recommended values by the Asphalt Institute- was observed in specimens prepared w...
Punching in slabs is generally seen by the application of concentrated loads or to the presence o... more Punching in slabs is generally seen by the application of concentrated loads or to the presence of columns. One of the major phenomenon related to flat slabs is its punching shear capacity at slab column connection. Provided that bending capacity is installed, punching shear failure is due to the development of a truncated cone-shaped surface at the slab-column connection. Frequently, there is the need to strengthen existing flat slabs against punching shear failure. However many research works have been done on punching shear. Moreover, we want to know the behavior of RC flat slab under FRP material against punching shear. The effect of FRP bars against punching shear is checked. The objective of the current study was to explain the feasibility of RC flat slab to examine the application of steel rods, FRP rebar on the improving of punching shear. Extensive applications of the fiber-reinforced polymer (FRP) as new construction materials have been recently accomplished. FRP materials...
This study was designed to perform a detailed structural, paleostress, and seismicity analysis of... more This study was designed to perform a detailed structural, paleostress, and seismicity analysis of the Jordan Wadi Ibn Hammad dam site and evaluate the dam's vulnerability. Lithologically, the dam's left abutment was constructed on the Upper Cretaceous rocks, comprised of limestones, silicified limestones, chalk, dolomite, tripoli, and chert. The structure setup of the dam site is controlled by the Dead Sea Transform Fault System (DST), the ENE-WSW segment of the dextral strike-slip Siwaqa Fault, and the extensional NW-SE Karak-Fayha Fault. The stress tensor in the dam area indicates an NW-SE SHmax and NE-SW Shmin. Three main types of fracture trends were detected; a major trend of 0-10° which is compatible with the DST; a 60°-70° trend which coincides with the Siwaqa Fault; and a 120°-130° which coincides with the Karak-Fayha Fault system and the σ1 direction derived from the Tensor program. As a result, rocks are susceptible to rockfall and mass wasting. Therefore, it is necessary to adopt grouting to the bedrock and trimming to reduce rock instability. The risk of rock mass movement into the reservoir region during impounding is significant. Thus, trimming is required to reduce rock instability.
Over the past two decades, much progress has been made in research and application of the base is... more Over the past two decades, much progress has been made in research and application of the base isolation of structures as means of providing earthquake resistance to a structure. However, the trade-off between the extent of acceleration reduction and the response of a base-isolation system has not been given a serious consideration. This work uses a new material constitutive model for rubber bearing base-isolation system, which adopts the technique of real-time structural parameter modification. To achieve this, a finite element modeling and analysis are performed as a comparative study between a conventional totally fixed-base steel frame structure and similar base-isolated structures using rubber-steel bearings. The structures are subjected to the El-Centro, N-S earthquake. In order to include nonlinearity effects, a non-linear hyperviscoelastic material model has been used and linked to ABAQUS software as a user defined material subroutine (i.e., UMAT). Special connector elements...
Journal of Pipeline Systems Engineering and Practice
AbstractCulverts have been used to transmit surface drainage under roadways in place of typical s... more AbstractCulverts have been used to transmit surface drainage under roadways in place of typical short-span bridges because they provide an economical construction system. In this paper, a numerical...
In this study, an improved finite element formulation with a scheme of solution for the large def... more In this study, an improved finite element formulation with a scheme of solution for the large deflection analysis of inextensible prismatic and nonprismatic slender beams is developed. For this purpose, a three-noded Lagrangian beam-element with two dependent degrees of freedom per node (i.e., the vertical displacement, y, and the actual slope, $dy/ds
This study deals with the post-buckling behavior of an inextensible elastic prismatic cantilevere... more This study deals with the post-buckling behavior of an inextensible elastic prismatic cantilevered column of length L which is loaded by a cable attached at the tip of the cantilever and at mid-length and terminate at the fixed support. The post-buckling behavior of the column–cable system is solved analytically in terms of elliptic integrals using the principle of elastic similarity.It was shown that for a given prescribed angle of inclination for the lower segment of the cable, four equilibrium configurations exist with two of these are of symmetrical type. Moreover, in order to generalize the present study for n-segment column, the case of the three-segment column has been investigated. For such case, the results showed that eight post-buckling equilibrium configurations existed with four of these configurations as a symmetrical type. This study has several interesting engineering applications in ultra-lightweight aerospace engineering such as in solar sails technology, flexible robotics arms, biomedical instrumentation and it can be used as a flexible fixing rod in space technology.
This paper derives an exact analytical solution for determining elastic critical buckling pressur... more This paper derives an exact analytical solution for determining elastic critical buckling pressures and mode shapes for very long corroded cylindrical steel shells subjected to external pressure considering symmetrical and anti-symmetrical mode cases. ...
ABSTRACT: This paper presents an exact solution for large deflection behavior of nonprismatic can... more ABSTRACT: This paper presents an exact solution for large deflection behavior of nonprismatic cantilever beams of nonlinear bimodulus type material and subjected to tip concentrated moment. The highly nonlinear simultaneous first-order differential equations were solved analytically using the power series approach. Several numerical examples are carried out to investigate the effect of bimodulus properties, material parameter, n, and the applied tip moment on the large deflection behavior of nonprismatic cantilever beams. The numerical results show that the interaction (i.e., coupling) between the bimodulus material properties, the material constant, n, and the applied tip moment, plays a significant role on the large deflection behavior of cantilever beams. A comparative study with ADINA has been made to verify the accuracy of the presented analytical solution, and excellent agreement has been obtained. KEY WORDS: ADINA, bimodulus material, cantilever beam, large deflection, nonlin...
Significant quantities of slag are generated as waste materials or by-product from steel industri... more Significant quantities of slag are generated as waste materials or by-product from steel industries. They usually contain considerable quantities of metals. In this study, steel slag obtained from a steel factory in Jordan was used in Asphalt Concrete Hot Mixes (ACHM). Marshall specimens were prepared with 100% lime stone dense graded aggregates at 4.5, 5, 5.5 and 6% bitumen contents by weight of aggregate to serve as control specimens. Another set of Marshall specimens with 100% Steel Slag Aggregates (SSA) and another set with a combination of limestone and (SSA) were prepared using the same grading and bitumen contents. Test results showed a reduction in the Optimum Bitumen Content (OBC) and an increase in density and stability values for specimens prepared with 100% (SSA). A decrease in the flow, Percentage of air voids (Pav), and Voids in Mineral Aggregates (VMA) values - but in compliance with the recommended values by the Asphalt Institute- was observed in specimens prepared w...
Punching in slabs is generally seen by the application of concentrated loads or to the presence o... more Punching in slabs is generally seen by the application of concentrated loads or to the presence of columns. One of the major phenomenon related to flat slabs is its punching shear capacity at slab column connection. Provided that bending capacity is installed, punching shear failure is due to the development of a truncated cone-shaped surface at the slab-column connection. Frequently, there is the need to strengthen existing flat slabs against punching shear failure. However many research works have been done on punching shear. Moreover, we want to know the behavior of RC flat slab under FRP material against punching shear. The effect of FRP bars against punching shear is checked. The objective of the current study was to explain the feasibility of RC flat slab to examine the application of steel rods, FRP rebar on the improving of punching shear. Extensive applications of the fiber-reinforced polymer (FRP) as new construction materials have been recently accomplished. FRP materials...
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Papers by Anis Shatnawi