- Seismic Performance Assessment of Buildings_Vol.1
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- Book Title / Journal:
- Year: 2012 , Volume: 1 , Series:
- Earthquake engineering
- Keywords: Seismic performance ; buildings
- Description
- This report describes a general methodology and recommended procedures to assess the probable seismic performance of individual buildings based on
their unique site, structural, nonstructural, and occupancy characteristics. Performance is measured in terms of the probability of incurring casualties,
repair and replacement costs, repair time, and unsafe placarding. The methodology and procedures are applicable to new or existing buildings, and
can be used to: (1) assess the probable performance of a building; (2) design new buildings to be capable of providing desired performance; or (3) design seismic upgrades for existing buildings to improve their performance.
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- Seismic performance of suspended ceilings: Critical review of current design practice
- A. Pourali ; R.P. Dhakal ; G.A. MacRae
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Earthquake engineering
- Keywords: Seismic performance ; suspended ceilings
- Description
- Recent experiences have shown that ceiling damage can result in property and functionality loss, injury or even death. This can occur at levels of shaking smaller than those required to produce noticeable structural damage. Despite their frequent use in
New Zealand, many suspended ceilings that experienced damage in the past earthquakes lacked either proper seismic design or efficient installation. There is also an increasing concern about the inconsistency of the limit state applied for the design of ceilings.
This study looks into the gaps and issues currently present in the seismic design and installation of suspended ceilings in New Zealand. In order to provide an inclusive background, the existing standards and guidelines for design and installation of ceilings both available in New Zealand and worldwide have been reviewed. Through this
comparative study, areas of similarity and discrepancy have been identified, along with
the ambiguities and gaps which define the extent of research required. Investigations have also been performed on the seismic design approaches of proprietary suspended ceilings. This study mainly addresses the residential and commercial suspended ceilings provided by two major ceiling manufacturers in New Zealand. The capacity of either ceiling
system has been evaluated through component based fragility studies. The comparison of the current systems’ capacity with the New Zealand code prescribed demand provides an objective understanding of the performance of the existing system. Moreover the efficiency of the assigned design limit states can be better evaluated.
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- Rehabilitation of earthquake damaged external RC beam-column joints
- J. Shafaei ; A. Hosseini ; M.S. Marefat ; J.M. Ingham
- Book Title / Journal: New Zealand Society for Earthquake Engineering (NZSEE) Annual Technical Conference
- Year: 2014 , Volume: , Series:
- Repair and Retrofit of Structures
- Keywords: RC buildings ; Earthquake ; beam-column joints ; Seismic performance
- Description
- Post-earthquake inspections of damaged RC buildings have demonstrated that poorly detailed beam-column joints can suffer serious damage. The effectiveness of a rehabilitation method based on joint enlargement using prestressed steel angles to
enhance the seismic behaviour of damaged external reinforced concrete beam-column joints was experimentally investigated. Three half scale external RC beam-column joints with seismic and non-seismic reinforcement details were tested before and after rehabilitation by applying lateral cyclic loading of increasing amplitudes. Tested
specimens were comprised of one unit having seismic reinforcement detailing and two units having non-seismic reinforcement detailing. Two defects were considered for the non-seismic units, being the absence of transverse steel hoops and insufficient bond capacity of beam bottom steel reinforcing bars in the joint panel zone. The damaged specimens were rehabilitated by injecting epoxy grout into existing cracks and installing stiffened steel angles at the re-entrant corners of the beam-column joint, both above and below the beam, that were mounted and held in place using prestressed high tensile strength bars. The test results indicated that the seismic performance of the rehabilitated
specimens, in terms of strength, stiffness and ductility were fully recovered with respect to the performance of the seismically detailed specimen in the initial loading.
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