ORCID Profile
0000-0001-6584-822X
Current Organisation
The University of Auckland
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Wiley
Date: 2009
DOI: 10.1002/EQE.943
Publisher: Elsevier BV
Date: 09-2013
Publisher: Hindawi Limited
Date: 06-06-2018
DOI: 10.1155/2018/9458023
Publisher: Elsevier BV
Date: 2008
Publisher: Wiley
Date: 20-02-2012
DOI: 10.1002/EQE.2168
Publisher: SAGE Publications
Date: 02-2006
DOI: 10.1260/136943306776232936
Abstract: Considerable research of pounding effect on adjacent structures has been conducted in the past. However, most of them neglected the effect of multi-sided poundings. In bridges multiple adjacent bridge structures are common. Consequently, restraint due to additional neighbouring bridge structures cannot be avoided. This study addresses the effect of multi-sided pounding on structural responses due to spatially varying ground movements. Additional effect of non-linear bearing supports of the girders is also considered. The ground motions were simulated stochastically according to the Newmark-Hall spectrum. The result shows that in order to estimate the pounding and bearing forces as well as unseating potential of the girders realistically a consideration of non-uniform ground motions, end-restraint effect and non-linear girder bearings is necessary.
Publisher: Wiley
Date: 23-11-2010
DOI: 10.1002/EQE.1076
Publisher: Elsevier BV
Date: 08-2005
Publisher: SAGE Publications
Date: 04-2013
DOI: 10.1260/1369-4332.16.4.619
Abstract: Previous studies of pounding responses of adjacent bridge structures under seismic excitation were usually based on the simplified lumped mass model or beam-column element model. Consequently, only 1D point to point pounding, which is usually in the longitudinal direction of the bridge, could be considered. In reality, pounding could occur along the entire surfaces of the adjacent bridge structures. Moreover, spatially varying transverse ground motions generate torsional responses of bridge decks and these responses may cause eccentric poundings. That is why many pounding damages occurred at corners of the adjacent decks as observed in almost all previous major earthquakes. A simplified 1D model cannot capture torsional response and eccentric poundings. To more realistically investigate pounding between adjacent bridge structures, a two-span simply-supported bridge structure located at a canyon site is established with a detailed 3D finite element model in the present study. Spatially varying ground motions in the longitudinal, transverse and vertical directions at the bridge supports are stochastically simulated as inputs in the analysis. The pounding responses of the bridge structure under multi-component spatially varying ground motions are investigated in detail by using the finite element code LS-DYNA. Numerical results show that the detailed 3D finite element model clearly captures the eccentric poundings of bridge decks, which may induce local damage around the corners of bridge decks. It demonstrates the necessity of detailed 3D modelling for a more realistic simulation of pounding responses of adjacent bridge decks to earthquake excitations.
Publisher: SAGE Publications
Date: 06-2012
DOI: 10.1260/2041-4196.3.2.123
Abstract: This paper addresses the damage to buildings and bridges resulting from relative movements between adjacent structures observed by the authors from building inspections and in-the-field investigations in Christchurch and surroundings carried out two weeks after the devastating earthquake of 22 February 2011. Relative structural response is often initiated by the different dynamic characteristic of the participating structures. Pounding induced damage might occur when the closing relative response is larger than the gap between adjacent structures. In the Central Business District (CBD) of Christchurch City many adjacent buildings have inadequate gaps between them or in many cases even no gap. Consequently, a large number of buildings, already weakened by the previous main shock of 4 September 2010 and its several thousand aftershocks, suffered further damage due to the strong February aftershock. The reoccurrence of excessive soil liquefaction caused particularly heavy damage to bridge sites along Avon River as the spatially varying ground movements induced large relative movement of the ground surface.
Publisher: Hindawi Limited
Date: 13-08-2021
DOI: 10.1155/2021/9790657
Publisher: New Zealand Society for Earthquake Engineering
Date: 30-06-2009
DOI: 10.5459/BNZSEE.42.2.75-85
Abstract: Pounding between bridge girders have been observed in almost all previous major earthquakes. This is because the gap size of conventional bridge expansion joint is usually only a few centimetres, which is not sufficient to preclude poundings owing to large relative displacements between bridge girders caused by the effect of varying vibration properties of adjacent bridge spans, varying ground motions at bridge supports and varying soil-structure interaction (SSI). In this work a new design of bridge expansion joint is introduced. Instead of tolerating pounding and providing possible mitigating measures, this new design approach enables large movement between bridge girders which makes a complete pounding preclusion possible. The new expansion joint is called Modular Expansion Joint (MEJ). The large movability is achieved by installing a number of small gaps in the joint. In this study, the MEJ gap size required to completely avoid girder pounding is investigated. The most significant influence factors – the varying vibration properties of adjacent bridge spans, the effect of SSI and ground motion spatial variation on expansion joint size required to preclude pounding- are calculated. Discussions on the relative importance of various structural and ground motion properties in generating relative displacements of adjacent bridge girders are made.
Publisher: World Scientific Pub Co Pte Lt
Date: 09-2013
DOI: 10.1142/S179343111350019X
Abstract: Seismic induced pounding damage to bridge structures was repeatedly observed in many previous major earthquakes. To avoid this adverse effect, extensive research efforts have been made by many researchers. This paper presents a state-of-the-art review in this field. It includes a brief review of the numerical modeling of bridge structures and impact models, numerical simulation of pounding responses between different components of bridge structures, experimental investigations, and pounding mitigation methods.
Publisher: Elsevier BV
Date: 2008
No related grants have been discovered for Nawawi Chouw.