Advances in Structural Engineering Research

Full Session with Abstracts

337103-3 - Nonlinear Dynamic Analysis for Seismic Performance Assessment of C-Shaped Reinforced Concrete Shear Walls

Friday, April 20
1:30 PM - 3:00 PM
Location: 202CD

How does this session impact and improve the Structural Engineering Profession?
The practice of Nonlinear Dynamic Analysis applied to the seismic performance assessment of C-Shaped Reinforced Concrete Shear Walls will be described. Finite and Fiber Element models, the results and code-to-code comparisons will be discussed. Guidelines about the capabilities and limitations of the models to predict seismic performance will be provided.

Abstract:
C-Shaped Reinforced Concrete Shear Walls (RCSW) typically house elevators in buildings and are widely used as lateral load resisting systems. Seismic loading causes biaxial bending and torsional moments in these walls, making them more prone to damage compared to simple shear walls. While considerable research has been conducted to investigate and improve the performance of such concrete shear walls, less data is available on the systematic assessment of their 3D seismic response to multi-component ground motion excitations. Nonlinear 3D effects under multi-directional seismic loading make the prediction of shear force demands and lateral displacement profiles for C-Shaped RCSWs even more challenging. This study investigates the nonlinear dynamic response of C-Shaped RCSWs subjected to bidirectional seismic ground motions. For this purpose, Finite and Fiber Element models programmed in various computational tools (e.g.. ADINA, ABAQUS, OpenSees, SeismoStruct, SAP2000) are used and their predictions of seismic performance of C-Shaped RCSWs are compared. The predictions of the models are first validated against available experimental data (including those from ongoing hybrid tests on a large-scale C-Shaped Reinforced Concrete Shear Walls). The developed models are then used to investigate the impact of multi-directional seismic input and nonlinear 3D seismic effects on the coupled flexural and shear hysteretic responses of C-Shaped RCSWs, including biaxial moment-curvature relationships, as well as local and global ductility demands in both horizontal directions. Displacement profiles for C-shaped walls are also investigated with the objective to define more appropriate target values that could be used in the framework of performance-based evaluation and design of this type of structures. Such displacement profiles are determined in terms of bidirectional lateral displacements, rotations and curvatures. Correlations with multi-directional seismic input (eg. scaling/matching/directional effects) are thoroughly examined to highlight the impact on the seismic design and safety evaluation of C-Shaped RCSWs.

Is this topic of regional, national or international interest?
The topic of this presentation is of national and international interest.

Who is the target audience?
The target audience includes academia, as well as code developers and practicing structural engineers in search of more guidelines to apply new code regulations (e.g., ACI-318, ASCE 7, ASCE 41-13, CNBC 2015, CAN/CSA A23.3, etc.).

What will the audience take away from your presentation?
The audience will namely benefit from the case studies illustrated and the capacities and limitations of the various computer programs and models used. The research topics presented will also favor discussions to improve future experimental programs for validation purposes and enhance the development of numerical models.

Najib Bouaanani

Professor
Polytechnique Montreal

Najib Bouaanani is Professor of Structural Engineering at Polytechnique Montreal (Canada) and a licensed professional engineer in Quebec (Canada). He has been involved in several consulting and Research and Development projects over the last 25 years. His expertise covers various aspects of earthquake engineering and the numerical and experimental modeling of the seismic behaviour and performance of structures. He is an active member of various technical committees including the committee on Seismic Effects of the American Society of Civil Engineers (ASCE) and the Earthquakes committee of the United States Society on Dams (USSD).

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337103-3 - Nonlinear Dynamic Analysis for Seismic Performance Assessment of C-Shaped Reinforced Concrete Shear Walls



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