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Displacement Based Design of Hybrid Coupled Walls with Replaceable Fuses

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2019, PhD, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
Hybrid coupled core wall structures (HCCWs) are typically comprised of reinforced concrete core walls connected by steel or composite coupling beams at each floor. In addition to better architectural functionalities, HCCWs show superior strength, ductility, and energy dissipation. Advancements in seismic design and construction methods have reduced catastrophic failures in recent earthquakes. However, direct and indirect financial implications due to repair cost, downtime during repairs, and business interruption could be very high not only for the property owners but for the surrounding communities. Therefore, there is a need to develop economically efficient seismic resistant structural systems that limit damage and reduce the impacts of post-earthquake repairs while maintaining the tenets of life safety during rare earthquakes.Steel coupling beams with a replaceable link is an innovative alternative for improving the seismic resilience of coupled wall systems and developing economically efficient structural systems. In addition to having desirable strength, stiffness, and high-energy dissipation features, this system is easy to construct relative to coupled walls using diagonally reinforced concrete beams. Furthermore, the damaged parts can be replaced following design level earthquakes. The concept of a replaceable fuse is relatively new, but the paucity of a robust and validated design methodology is an impediment for a widespread application of coupling beams with a replaceable fuse. A new performance-based design methodology for design of coupled walls with steel coupling beams that have a replaceable fuse was investigated. As the seismic damage is directly related to deformation or displacement, the direct displacement-based design method was the basis of the design method. The desired performances are (a) to minimize damage allow repair at design-level earthquake (DBE, i.e., 10% probability of exceedance in 50 years) and (b) to prevent collapse at the maximum credible event (MCE). A number of buildings with different heights and core wall layouts were designed according to the proposed design methodology. The study also investigated two different ways to distribute the coupling beams over the building height: (1) uniform distribution and (2) distribution based on drift profile. The performance of these buildings was investigated by performing nonlinear response history analyses under a suite of measured ground motions at both the DBE and MCE hazard levels. All the prototype structures were found to satisfy the intended performance objectives. The method for distributing the coupling beams over the building height was found to have small effects.
Bahram Shahrooz, Ph.D. (Committee Chair)
Rachel Chicchi, Ph.D. (Committee Member)
Kent Harries, Ph.D. (Committee Member)
Richard Miller, Ph.D. (Committee Member)
383 p.

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Citations

  • Muhaisin, M. (2019). Displacement Based Design of Hybrid Coupled Walls with Replaceable Fuses [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417559037604

    APA Style (7th edition)

  • Muhaisin, Muthana. Displacement Based Design of Hybrid Coupled Walls with Replaceable Fuses. 2019. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417559037604.

    MLA Style (8th edition)

  • Muhaisin, Muthana. "Displacement Based Design of Hybrid Coupled Walls with Replaceable Fuses." Doctoral dissertation, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1574417559037604

    Chicago Manual of Style (17th edition)