Analysis of masonry arch bridges.

Ng, Kwooi-Hock (1999) Analysis of masonry arch bridges. PhD thesis, Edinburgh Napier University.

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    In January 1999, the maximum axle weight increased from IN to 11.5t for the
    assessmenot f highway bridges and structures. At the samet ime, the maximum vehicle
    weight also increased from 38t to 44t. Highway authorities are urgently searching for a
    more refined assessmenmt ethod to predict the behaviour of masonry arch bridges.
    LUSAS finite element analysis was used to study the behaviour of masonry arch
    bridges. Load versus deflection curves and collapse loads are given for some of the full
    and large scale arches previously tested to collapse. A parametric study was also
    performed to determine the influence of the arch material properties and the load
    dispersal angle: the arch tensile strength and the load dispersal angle were found to
    have the most significant influence on the collapse load predictions.
    Repeatability tests were carried out by building three nominally identical large scale
    arch bridges in the laboratory and testing them to collapse. The first, second and third
    arches collapsed at 2lkNm', 16kNm', and 25kNm 1 respectively. Finite element
    analysis predicted a range of 18kNm' to 39kNm 1 for the same arches. This led to an
    examination of a statistical, risk based, approach to bridge assessment.
    Two novel risk assessment programs were developed by integrating Monte Carlo
    simulation with the MEXE and the mechanism methods. Statistical information about
    the predicted collapse load and allowable axle load is given. These risk assessment
    tools are offered for incorporation within routine assessmenmt ethods. Their principal
    benefit lies in providing engineers with a feel for the reliability of their analyses.
    A modification has been made to the mechanism method by considering arch
    deflection. A mechanism prediction is accurate only when all the forces and their
    positions are accurately located. The modified mechanism method was used to analyse
    some of the full scale arch bridges, previously tested to collapse, which revealed that
    arch deflections had a significant influence on the collapse load prediction.

    Item Type: Thesis (PhD)
    Uncontrolled Keywords: Masonry arch bridges; axel weight; LUSAS; finite element analysis; collapse load; deflection;
    University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
    Dewey Decimal Subjects: 600 Technology > 690 Building & construction > 690 Buildings
    600 Technology > 620 Engineering > 624 Civil engineering
    Library of Congress Subjects: T Technology > TG Bridge engineering
    Item ID: 3673
    Depositing User: Mrs Lyn Gibson
    Date Deposited: 11 Mar 2010 19:53
    Last Modified: 12 Jan 2011 04:54

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