Implementation of a Simple Biaxial Concrete Model for Reinforced Concrete Membranes

  • Author / Creator
    Garcia Ramirez, Bernardo
  • Although significant progress in the modelling of the nonlinear response of reinforced - concrete (RC) structures at the element level has been achieved in the past decades, reliable and accurate analysis models at the system level for RC structures are scarce. Due to the complexity of elements required to model the 3D response of RC panels, nonlinear analysis of complete RC structures is avoided and instead the response of selected sub-assemblies, isolated from the rest of the structure, is examined in usual design practice. As a result, there is substantial uncertainty on the response of complete RC buildings, making it impossible to analyse global failure modes and making the design more complicated and potentially unsafe. Although simple structures can be designed and analysed based on the response of their components with good accuracy, RC shear wall buildings with complex geometries or under extreme loading necessitate the analysis of the full structure. Recent progress in the development of efficient element formulations to simulate the nonlinear in-plane and out-of-plane response of RC panels, and the availability of experimental data on the response of full shear wall structures, offers the possibility of developing reliable and efficient analysis models for entire RC structures under static and dynamic loads. This research discusses the advantages and disadvantages of some of the most prominent biaxial element formulations for the nonlinear finite element analysis (FEA) of RC structures. After the assessment, the Mazars concrete material, a damage-based model, is adapted for the use in finite element analysis in plane-stress multilayer-shell elements. The element formulations are implemented in the OpenSees framework, an object-oriented and open-source framework for simulating applications in earthquake engineering using finite element methods. Finally, the new Mazars model is used to perform quasi-static, reversed cyclic and dynamic analysis of specimens found in literature, and the analytical results are verified with the test data.

  • Subjects / Keywords
  • Graduation date
    Fall 2017
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.