Off-campus UNL users: To download campus access dissertations, please use the following link to log into our proxy server with your NU ID and password. When you are done browsing please remember to return to this page and log out.
Non-UNL users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
Seismic Analysis, Behavior, and Design of Diaphragm Collectors Using Ductile Replaceable Fuse Elements
Abstract
This study presents an innovative inelastic collector system that transfers seismic forces from the floor diaphragms to the lateral force-resisting system (LFRS) while keeping the LFRS in the elastic region. Investigation of the inertial forces on floors showed that the interaction of the core and floor system causes each floor to trace different acceleration histories; thereby, each collector element was proportioned concerning the interaction. Thus, the proposed system might achieve a similar collapse prediction (Collapse Margin Ratio) no matter for low-, mid-, and high-rise structures. Moreover, it allows the designer to consider every story separately for different design purposes, e.g., controlling seismic demand on any floor and eliminating localized energy dissipation in a single story.Nonlinear dynamic analyses using 44 time-history records required by FEMA P-695 were performed for 24 archetypes to assess the proposed system's seismic analysis, behavior, collapse assessment, and design process.Alternatively, the system makes it possible to use an extensive array of options associated with inelastic mechanisms/devices that can be used due to vertical decoupling. It allows combinations of different mechanisms/devices such as viscoelastic, friction, and elastomeric dampers. And importantly, the inelastic collector system carries no gravity load, so it is ideal for post-event retrofit, thereby increasing the resiliency of the entire structural system. The other contribution is to propose a linear and nonlinear design process for the proposed system. The design process, which follows ASCE 7 and FEMA P-695 instructions, considers the influence of fundamental and higher modes' contributions to the proportion of each collector element.
Subject Area
Civil engineering|Architectural engineering
Recommended Citation
Uludag, Tunc Deniz, "Seismic Analysis, Behavior, and Design of Diaphragm Collectors Using Ductile Replaceable Fuse Elements" (2022). ETD collection for University of Nebraska-Lincoln. AAI29166551.
https://digitalcommons.unl.edu/dissertations/AAI29166551