Overview and Analysis of Seismic Resilient Structures with Modular Rocking Shear Walls

TL;DR

This paper explores the use of modular rocking shear walls in multi-story buildings to improve seismic resilience by promoting uniform drift distribution and preventing soft-story failures, supported by numerical case studies.

Contribution

It provides a comprehensive analysis of rocking shear walls and demonstrates their effectiveness through numerical simulations on multi-story frames.

Findings

Rocking shear walls promote uniform interstory drift distribution.

Addition of rocking shear walls enhances seismic performance.

First mode becomes dominant, reducing soft-story failure risk.

Abstract

The high occupancy rates in urban multi-story buildings, combined with present safety concerns, necessarily prompt a reassessment of performance goals. Given the notable seismic damage and instances of weak-story failures that have been documented after major earthquakes, this paper studies the use of modular shear walls that are free to rock above their foundation. This paper first provides a comprehensive background in analysis of rocking elements such as columns and shear-walls. Then discusses different configurations of rocking-shear-walls. Next, the paper provides two numerical case studies on 9-story and 20-story moment-resisting frames using OpenSees. The floor displacement and interstory drifts under various earthquake excitations for both structures compared for the cases of with and without modular rocking walls. The result shows that the addition of rocking-shear-wall, makes the first mode of the frame becomes dominant which enforces a uniform distribution of interstory drifts that would avoid a soft-story failure.