Probabilistic collapse resistance and residual drift assessment of buildings with fluidic self‐centering systems

Abstract

SUMMARYThe seismic performance of three-and six-story buildings with fluidic self-centering system is probabilistically assessed. The fluidic self-centering systems consist of devices that are based on the technology of fluid viscous dampers but built in a way that pressurization of the devices results in preload that is explored to reduce or eliminate residual drift. The design of these buildings followed a procedure that parallels the design for structures with damping systems in ASCE 7 but modified to include the preload effect. Reference conventional buildings were also designed per ASCE 7 for comparison. These buildings were then analyzed to examine and compare their seismic collapse resistance and residual drift, where the residual drift limits of 0.2, 0.5, 1.0 and 2.0% of story height were selected as important thresholds. The study further calculated the mean annual frequency of collapse and corresponding exceedance probability over 50 years, and the mean annual frequency of exceeding the threshold residual story drift limits and the corresponding exceedance probability over 50 years. Variations in the design procedures by considering increased displacement capacity or damping or preload of the devices, different types of damping, increased ultimate strength of the selfcentering device-brace systems and increased frame strength were considered. It was found that increasing either the ultimate force capacity of the self-centering device-brace system or the frame strength results in important improvements in the collapse resistance and in minimizing residual drift, whereas the variation of other design parameters has minor effects.

A probabilistic framework for estimating the residual drift of idealized SDOF systems of non‐degrading conventional and damped structures

“…2,[5][6][7] Using realistic models of entire structures captures the residual drift trends for different structural systems, including the influence of MDOF effects. The first approach relies on numerical analysis of representative multi-story buildings to draw statistical inferences on the residual drift.…”

“…This approach has been used to examine the residual drift performance of specific, conventional, or high-performance structures. 2,[5][6][7] Using realistic models of entire structures captures the residual drift trends for different structural systems, including the influence of MDOF effects. However, the statistical models developed in these studies are usually very case specific and/or require an independent calibration when applied to a system that differs even slightly from the one used in the study.…”

Seismic design and assessment of structures with viscous dampers at limit state levels: Focus on probability of damage in devices

“…It was concluded that greater magnification factors increased failure probability of the dampers as well as collapse probability of the structure. Likewise, the collapse performance of the fluidic self‐centering system was also studied by Kitayama et al incorporating the ultimate behavior of this device …”

Strength reduction factor of self-centering structures under near-fault pulse-like ground motions

“…Due to the excellent characteristics of self-centering structures, they are widely applied in engineering practices. Therefore, the seismic design method of such structures has attracted more and more attentions of the structural earthquake engineering community as well (Eatherton et al, 2014; Kitayama and Constantinou, 2016b; Liu et al, 2018; Qiu and Zhu, 2017a).…”