A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Risk-based seismic performance assessment of existing tall steel framed buildings
One of the major concerns in earthquake disaster resilience is understanding the risk posed by existing buildings that are not conformant with modern building codes. A related challenge is how, if necessary, to mitigate the risk through retrofit policies or other measures in a cost effective manner. For some types of buildings, such as unreinforced masonry, the risks are so obviously large, that mandatory laws have been enacted to assess and retrofit the buildings. However, in other cases, such as with non-ductile concrete buildings or older tall steel buildings, the risks and mitigation strategies are not as clear cut. This research addresses the risks posed by older seismically deficient steel buildings, which constitute a significant portion of tall buildings in western US cities with high seismic hazard. These buildings include many steel moment resisting frames (MRF), constructed during the late 1960's through mid-1990's, with the type of welded connections that experienced sudden brittle fractures during the 1994 Northridge earthquake. This work applies performance-based earthquake engineering (PBEE) tools to this potential seismic safety problem. San Francisco is selected as a case study city in order to permit engagement with the city’s ongoing earthquake safety initiatives. The performance of existing 1970s tall steel MRF buildings is evaluated through the development of archetype buildings. A series of studies that progressively explore the performance of individual archetype buildings, within a probabilistic framework, are carried out, including scenario-based, intensity-based and time-based assessments. Additionally, a method is proposed to extend such assessments to evaluate clusters of buildings and how their performance may impact the resilience of the community; going beyond individual building performance, towards more holistic seismic performance evaluations. The results of this body of research are communicated not only in terms of structural response, but also in terms of direct economic ...
Risk-based seismic performance assessment of existing tall steel framed buildings
One of the major concerns in earthquake disaster resilience is understanding the risk posed by existing buildings that are not conformant with modern building codes. A related challenge is how, if necessary, to mitigate the risk through retrofit policies or other measures in a cost effective manner. For some types of buildings, such as unreinforced masonry, the risks are so obviously large, that mandatory laws have been enacted to assess and retrofit the buildings. However, in other cases, such as with non-ductile concrete buildings or older tall steel buildings, the risks and mitigation strategies are not as clear cut. This research addresses the risks posed by older seismically deficient steel buildings, which constitute a significant portion of tall buildings in western US cities with high seismic hazard. These buildings include many steel moment resisting frames (MRF), constructed during the late 1960's through mid-1990's, with the type of welded connections that experienced sudden brittle fractures during the 1994 Northridge earthquake. This work applies performance-based earthquake engineering (PBEE) tools to this potential seismic safety problem. San Francisco is selected as a case study city in order to permit engagement with the city’s ongoing earthquake safety initiatives. The performance of existing 1970s tall steel MRF buildings is evaluated through the development of archetype buildings. A series of studies that progressively explore the performance of individual archetype buildings, within a probabilistic framework, are carried out, including scenario-based, intensity-based and time-based assessments. Additionally, a method is proposed to extend such assessments to evaluate clusters of buildings and how their performance may impact the resilience of the community; going beyond individual building performance, towards more holistic seismic performance evaluations. The results of this body of research are communicated not only in terms of structural response, but also in terms of direct economic ...
Risk-based seismic performance assessment of existing tall steel framed buildings
Molina Hutt, Carlos (author)
2017-12-28
Doctoral thesis, UCL (University College London).
Theses
Electronic Resource
English
DDC:
720
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