Seismic Isolation Systems Analysis and potential application for Rural Housing in China

Abstract

With unpredictability and widespread devastation, earthquakes have long been a concern for
regions prone to seismic activity. The U.S. alone faces staggering annual losses, and events like
the 2015 Nepal earthquake further underscore the gravity of the situation. With its vulnerable
rural areas, China faces a unique challenge, as showcased by the 2008 Wenchuan earthquake,
which resulted in significant casualties. Despite their emphasis on reinforcing structures, traditional seismic designs often need to improve in mitigating secondary damages. To address
these inadequacies, this thesis delves into the innovative structural control concept, originally
rooted in aerospace but now adapted for civil structures. Specifically, passive control methods
like base isolation are spotlighted for their potential benefits.
The crux of the research revolves around the development and evaluation of the combination
of Pure Friciton and Lead rubber isolation (PF-LRB) model, a seismic isolation model that
synergises the strengths of PF (Pure friction) and LRB (Lead rubber bearing). A comprehensive
comparative analysis is undertaken, evaluating the performance dynamics of various seismic
isolation models across single and multi-degree of freedom structures. The research further
deepens its investigation by correlating intensity measures, assessing model responses to varied
ground motion types and conducting an extensive parametric study of the PF-LRB system
using China’s ground motion data. The ultimate aim is to strike a balance between cost and
performance, especially in rural Chinese settings.
This thesis, structured across seven chapters, begins with a historical overview of seismic
isolators, leading to the introduction of the PF-LRB model and its validation. Subsequent
chapters offer detailed performance analyses, with the concluding sections summarising the
findings and pointing towards future research avenues. The work is dedicated to the domain,
bridging the gap between cost-effective solutions and efficient seismic protection for vulnerable
regions.

Date of Award	18 Mar 2025
Original language	English
Awarding Institution	University of Bristol
Supervisor	Adam J Crewe (Supervisor) & Nicholas A Alexander (Supervisor)