Behavior of Reinforced Concrete Elements subjected to Tri-Directional Loads
Event details
| Date | 16.10.2015 |
| Hour | 12:15 › 13:15 |
| Speaker | Ashraf Ayoub, Ph.D., P.E., FACI, Royal Academy of Engineering Chair and Professor, City University London |
| Location | |
| Category | Conferences - Seminars |
The two-dimensional design and behavior of typical reinforced concrete (RC) structures has been extensively studied in the past several decades. Such design requires knowledge of the constitutive behavior of reinforced concrete elements subjected to a biaxial state of stress. These constitutive models were accurately derived from experimental test data on representative reinforced concrete panel elements. The true behavior of many large complex structures however, requires knowledge of the constitutive laws of RC elements subjected to a triaxial state of stress. The goal of the proposed work is to develop new constitutive relations for RC elements subjected to a triaxial state of stress. To accomplish this task, large-scale tests on representative concrete panels need to be performed. An experimental program was conducted using a state of the art panel tester in order to evaluate the behavior of reinforced concrete elements subjected to tri-directional loads. The results of several full scale RC elements subjected to tri-directional shear loads are discussed. The tests revealed that the application of out-of-plane shear loads clearly reduced the in-plane shear strength. Based on these results, an interaction diagram between the three tri-directional shear stresses acting on a reinforced concrete element was developed. An element-based approach was then adopted in which these constitutive relations were integrated using the finite element method to predict the overall behavior of the entire structure. The newly developed three-dimensional finite element model is based on mixed fiber beam-column formulations, in which the new constitutive laws are accounted for at the fiber level. The model is currently being extended to account for different material and geometric nonlinear effects. The presentation concludes with correlation studies of RC columns subjected to three-dimensional static and dynamic loads. Theses studies proved the newly developed model can provide reasonable estimates when compared to experimental results.
Bio : Prof. Ayoub holds the Royal Academy of Engineering Pell Frischmann Chair of Nuclear Infrastructure at City University London, UK. He obtained his MSc and Ph.D. in Civil Engineering from the University of California-Berkeley and was a Post-Doctoral fellow at Stanford University. He is a Fellow of the American Concrete Institute; a past chair of Joint ACI-ASCE Committee 447, Finite Element Analysis of Reinforced Concrete Structures, and the ASCE committee on Emerging Computing Technologies. He currently serves as associate editor for the Journal of Structural Engineering, ASCE. His current research is in the field of design and analysis of nuclear infrastructure systems, nonlinear finite element analysis, constitutive modeling of materials through experimental and analytical techniques, earthquake engineering, and design of Fiber Reinforced Polymer composite systems. He was previously on the faculty at the University of Houston and the University of Missouri-Rolla, USA.
Bio : Prof. Ayoub holds the Royal Academy of Engineering Pell Frischmann Chair of Nuclear Infrastructure at City University London, UK. He obtained his MSc and Ph.D. in Civil Engineering from the University of California-Berkeley and was a Post-Doctoral fellow at Stanford University. He is a Fellow of the American Concrete Institute; a past chair of Joint ACI-ASCE Committee 447, Finite Element Analysis of Reinforced Concrete Structures, and the ASCE committee on Emerging Computing Technologies. He currently serves as associate editor for the Journal of Structural Engineering, ASCE. His current research is in the field of design and analysis of nuclear infrastructure systems, nonlinear finite element analysis, constitutive modeling of materials through experimental and analytical techniques, earthquake engineering, and design of Fiber Reinforced Polymer composite systems. He was previously on the faculty at the University of Houston and the University of Missouri-Rolla, USA.
Practical information
- General public
- Free
Organizer
- Prof. Dr Brice Lecampion & Katrin Beyer
Contact
- Prof. Dr Katrin Beyer