Seismic Behavior of Coupled Shear Walls made of Ductile Fiber-Reinforced Cement-Based Composite

Session: E: Structural Challenges: Designing for Endurance

Ibrahim MetwallyProject image

Ibrahim Metwally
Full Professor, PhD, Housing and Building National Research Center

No tall building is free of coupled shear walls; solid or single shear walls in structures constitute an architecturally impractical design. The efficiency of coupled shear walls in tall buildings is the main factor for the performance of concrete structures during earthquakes. The major aims of using coupled shear walls are to disperse more earthquake energy and give more stiffness to the structure. Mostly, the maximum seismic damage occurs in the coupled shear walls, because they resist most of the seismic force alone, especially in walls, footings and coupling beams.

Ductile fiber-reinforced cement-based composite (DFRCC) was developed to overcome the brittleness of conventional normal-strength concrete (NSC) and high-strength concrete (HSC). Even though there is no significant compressive strength increase compared to NSC and HSC, DFRCC is characterized by its high ductility, superior behavior in tension, excellent crack dispersion capacity, and good workability.

This research covers the gap around DFRCC applications with coupled shear walls. The goal is to deeply study and understand the nonlinear behavior of coupled shear walls made with DFRCC. The seismic response of the DFRCC coupled-wall system was evaluated using nonlinear static pushover analysis and compared with the response of coupled wall systems made with NSC and HSC. More ductile deformations occurred in the DFRCC coupled shear walls, and more seismic energy dissipation was also attained.