@conference {bnh-6386, title = {Out-of-plane fragility of URM parts and components based on time-history analysis-comparison to simplified force-based approaches}, booktitle = {Australian Earthquake Engineering Society 2019 Conference}, year = {2019}, month = {12/2019}, address = {Newcastle}, abstract = {

This paper presents a technique for constructing analytical fragility curves for generic URM components such as parapets and fa{\c c}ade walls subjected to out-of-plane actions. The technique implements a nonlinear time-history-analysis (THA) that computes the wall{\textquoteright}s displacement history under generic shaking input. The model defines the wall{\textquoteright}s capacity by a force-displacement model that neglects tensile bond strength and assumes that all resistance comes from rocking stability and, where applicable, friction. Synthetic accelerograms compatible with the AS 1170.4-2007 soil class D spectrum were used as the ground motion, and the acceleration input applied at the component level was computed by a precursor THA of the building to account for its motion-filtering influence and height amplification. Fragility curves were generated for several different wall configurations including parapets, one-way and two-way spanning walls. The generated curves are used to examine three alternate force-based approaches permitted by AS 1170.4. It is shown that the code techniques are unreliable in estimating the ground motion intensity to cause collapse, and that they are in some instances overly conservative (uneconomical) while being unconservative in others.

}, keywords = {force-based assessment, fragility curves, out-of-plane, time-history-analysis, unreinforced masonry}, url = {https://aees.org.au/wp-content/uploads/2019/12/62-Jaroslav-Vaculik.pdf}, author = {Jaroslav Vaculik and Michael Griffith} } @article {bnh-4507, title = {Seismic fragility curves for limited ductile RC Buildings including the response of gravity frames}, journal = {Australian Earthquake Engineering Society}, year = {2017}, month = {11/2017}, pages = {13}, abstract = {

The aim of this study is to assess the seismic performance of limited ductile reinforced concrete buildings in line with performance-based earthquake engineering principles. Limited ductile RC buildings are vulnerable to undesirable and sudden brittle failures which need to be considered in nonlinear models. The response of both the primary lateral load resisting system and the gravity load resisting system is considered. A brief description of the modelling approaches adopted to simulate the response of the core walls and frame components in a macro-finite element modelling space is provided. Using the adopted approach the seismic performance of two generic buildings with a symmetric plan is assessed. Nonlinear time-history analyses are conducted to obtain the building response to seismic ground motion. Probabilistic seismic demand model is developed using {\textquoteleft}Cloud{\textquoteright} analysis. Finally, fragility curves are developed considering four different performance limits to assess the seismic risk of the buildings.

}, keywords = {cloud analysis., fragility curves, Limited ductile reinforced concrete, moment resisting frames, seismic assessment}, url = {http://www.aees.org.au/wp-content/uploads/2018/02/455-Anita-Amirsardari.pdf}, author = {Anita Amirsardari and Helen M. Goldsworthy and Elisa Lumantarna and Pathmanathan Rajeev} } @article {bnh-4667, title = {Seismic Vulnerability Assessment of Asymmetrical Reinforced Concrete Buildings in Australia}, journal = {Australian Earthquake Engineering Society }, year = {2016}, month = {11/2016}, abstract = {

Many reinforced concrete buildings in Australia are laterally supported by reinforced concrete cores/shear walls that are eccentrically located in the buildings. The structural elements at the edges of the asymmetrical buildings can be subjected to a significant displacement demand, making this type of buildings highly vulnerable in an earthquake. Seismic assessment methods for asymmetrical buildings commonly involve three-dimensional dynamic analyses that can be computationally expensive. This paper presents a simplified analysis method for multi-storey buildings featuring plan asymmetry. The method has been used to assess the seismic vulnerability of asymmetrical reinforced concrete buildings in Australia.

}, keywords = {Aymmetrical buildings, fragility curves, reinforced concrete., simplified analysis method}, url = {https://www.aees.org.au/wp-content/uploads/2018/06/379-Lumantarna-et-al.pdf}, author = {Elisa Lumantarna and Alireza Mehdipanah and Nelson Lam and Hing-Ho Tsang and John Wilson and Emad F Gad and Helen M. Goldsworthy} }