Thesis topic proposal
Attila László Joó
Development of external bracing system to strengthen existing multi-story buildings in earthquake areas


Institute: Budapest University of Technology and Economics
civil engineering
Pál Vásárhelyi Doctoral School of Civil Engineering and Earth Sciences

Thesis supervisor: Attila László Joó
Location of studies (in Hungarian): BME Hidak és Szerkezetek Tanszéke
Abbreviation of location of studies: BMEHS

Description of the research topic:

Due to the ongoing research in the field of seismicity new and higher risk seismic areas found around the world. Furthermore after tsunamis in the recent years earthquake zone changes dramatically in coastal regions. Existing buildings in those areas within increasing risk of earthquake loads, especially high rise buildings which structure is not able to resist and may collapse when receiving those larger earthquake loads.
Strengthening those buildings structures becomes very important to ensure the safety of building occupants and to extend the life of the building. One of the existing methods of strengthening buildings on moderate and high seismic areas is external bracing that has been used in several places in the world, such as in New-Zealand, Japan and Italy.
The aim of the PhD dissertation is to improve the existing steel external bracing concept with new structural systems. These can be the so-called self-centering rocking frames or actively controlled dampers that are new and extensively researched structural systems in the USA and Japan. The supervisor has done research on rocking frames at Lehigh University, USA and the Department of Structural Engineering has experience with research on energy dissipating member namely with BRB’s. With the help of this PhD dissertation the department can join to this early stage research that can be applied on existing multi-story buildings that are at increasing risk for earthquake loads.
The research aims the following subtasks for three years:
- literature review on increased seismicity and the consequences; structural arrangements and design methods of existing external bracings; self-centering bracing systems and/or damper systems, materials; static and dynamic non-linear modeling methods;
- based on the literature review develop new external bracing systems and preliminary design methods to extend the life of buildings for increased earthquake loads;
- select benchmark buildings where the application of external bracing systems is relevant; develop numerical models; complete non-linear analysis, performance based design and reliability analysis;
- propose design methods for standardization of the new external bracing system and verify the design method with the research results.

Number of students who can be accepted: 1

Deadline for application: 2016-12-20

2017. I. 31.
ODT ülés
Az ODT következő ülésére 2017. március 10-én 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).

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