3 results for Abdul Karim, AR

  • Wall-diaphragm connection assessment guideline for URM buildings

    Abdul Karim, AR; Quenneville, Pierre; Sa'don, NM; Ingham, Jason (2011-04-14)

    Conference item
    The University of Auckland Library

    The connections between walls and diaphragm in unreinforced masonry (URM) buildings typically consist of two major parts. The first part is the wall anchorages and the second part is the diaphragm connections. From the NZNSEE (1995) and FEMA (2006) guidelines, the connection strength values given by both guidelines are apparently related only with the possible failures of the masonry wall anchorages, and no procedures are currently available to identify the strength values related to failure of the timber bolted connections. This latter failure mode is important to consider as the minimum strength value that will govern the wall-diaphragm connection capacity can be acquired from the diaphragm connections. To counter this limitation, this study recommends a set of design equations to assess the strength of the timber bolted connections. By using these equations, in addition to the default connection strength values provided by the guidelines, the expected strength level of wall-diaphragm connections can be accurately assessed.

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  • Procedures for seismic assessment of unreinforced masonry buildings

    Ingham, Jason; Russell, Alistair; Abdul Karim, AR; Oyarzo Vera, C (2008)

    Conference item
    The University of Auckland Library

    Recent legislation requires all unreinforced masonry buildings in New Zealand to be seismically assessed. If the building is found to have less than 1/3rd of the strength of a comparable new building, then it is described as earthquake prone, and must be either strengthened or demolished. To complete the assessment process, all buildings are first subject to an Initial Evaluation Procedure (IEP). Currently, software is being developed to facilitate execution of the IEP during field inspection of the building, with data relayed to a centralized web-based depository. If the IEP indicates that the building is earthquake prone then a detailed seismic assessment must be conducted. A variety of detailed assessment procedures exist, but New Zealand practitioners have communicated varying degrees of dissatisfaction with these techniques and an improved detailed assessment procedure is therefore being developed. Aspects of the IEP process and detailed assessment procedures available and under development are reported.

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  • Dynamic testing of a timber floor diaphragm in an unreinforced masonry building

    Wilson, Aaron; Abdul Karim, AR; Oyarzo-Vera, C; Omenzetter, Piotr; Ingham, Jason (2008)

    Conference item
    The University of Auckland Library

    The flexibility of timber diaphragms in unreinforced masonry buildings has been reported to have a significant effect on the seismic performance of the complete structure. In New Zealand, there currently exists a need to improve the knowledge and expertise associated with the performance of timber diaphragms to assist the seismic assessment of unreinforced masonry buildings and design of seismic retrofit solutions. To address this issue, a series of modal tests were conducted on the third floor timber diaphragm of the Nathan Building located in Auckland’s Britomart Precinct, which is a building typical of New Zealand historic unreinforced masonry construction. Preliminary analysis indicates that the fundamental horizontal natural frequency occurs at 20.5 Hz which reasonably matched the finite element model, which predicted a frequency of 18.49 Hz. Further testing, system identification and finite element updating is required to determine accurate dynamic diaphragm properties. An investigation of typical New Zealand diaphragm details was also conducted to aid future testing and finite element modelling.

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