Non linear analysis of composite flanged reinforced
Dissertant
University
University of Technology
Faculty
-
Department
Department of Building and Construction Engineering
University Country
Iraq
Degree
Ph.D.
Degree Date
2004
English Abstract
A three-dimensional finite element computer program (3DMICP) is developed in this research work to study the nonlinear response of composite concrete structures.
In this program, material nonlinearities due to behaviour of concrete in compression, crushing, cracking of concrete in tension, tension stiffening and shear retention effects of cracked concrete, and yielding of reinforcement, are included.
The nonlinearities due to slipping, separation and shear stress reduction after separation, at the interface (joint) between the two concrete parts, are also considered. The developed computer program has been used for the analysis of initially cracked and monolithic reinforced concrete push-off specimens, monolithic and composite reinforced concrete T-beams in bending and composite unsymmetrical : I-beams under flexure .Results obtained from analytical and experimental tests have been compared .The 8-node isoparametric surface element is used to model the interface between the two concrete parts, as that between the precast concrete stem and cast-in-place concrete flange in the composite flanged concrete beam .
Concrete in compression is simulated by an elasto-plastic work hardening model, while concrete in tension is simulated by a fixed smeared crack model.
Reinforcing bars are modeled as axial members embedded within the brick elements which are used to model the concrete.
Perfect bond between concrete and steel bars is assumed.
The behaviour of composite concrete structures at the interface is simulated by slip and separation models. The nonlinear equations of equilibrium have been solved by using an incremental-iterative technique based on the modified Newton-Raphson Parametric studies are presented.
They deal with the effect of some important material parameters, at the interface, on the predicted finite element results.
Other studies are made to investigate the reduction in composite action and detect the two-beam action for the composite concrete beams, and comparison between slip measurements obtained from experimental and analytical tests are presented in this work.
A comparative study between the horizontal shear force developed in composite concrete beams based on experimental and analytical results and the horizontal shear force recommended by ACI code (318M-02) based on shear friction or compressive force in the supporting element, is also presented.
It is found that the developed program is efficient in predicting the behaviour of composite concrete members, when comparison is made between the analytical results and the experimental tests.
The ratio of predicted to experimental ultimate load has a value of (1.01 ) for push-off specimen , an average value of (0.98 ) for composite T-beams in bending , and an average value of (0.97 ) for composite unsymmetrical I-beams under flexure.
Main Subjects
Topics
American Psychological Association (APA)
Hammudi, Mayy Jasim. (2004). Non linear analysis of composite flanged reinforced. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305572
Modern Language Association (MLA)
Hammudi, Mayy Jasim. Non linear analysis of composite flanged reinforced. (Doctoral dissertations Theses and Dissertations Master). University of Technology. (2004).
https://search.emarefa.net/detail/BIM-305572
American Medical Association (AMA)
Hammudi, Mayy Jasim. (2004). Non linear analysis of composite flanged reinforced. (Doctoral dissertations Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-305572
Language
English
Data Type
Arab Theses
Record ID
BIM-305572
