@article {bnh-8207, title = {Shear Wall and Frame Dual Systems Featuring Discontinuous Load Paths in Frame Elements in Low-to-Moderate Seismic Regions}, journal = {Journal of Earthquake Engineering}, year = {2021}, month = {09/2021}, abstract = {

Reinforced concrete buildings constitute a significant portion of construction in Australia. Many existing buildings in Australia and other low to moderate seismic regions have been designed with little to no consideration for ductile detailing. The majority of these buildings also possess vertical irregularities, which can exacerbate their vulnerability in an earthquake event. The seismic performance of shear wall and frame dual systems possessing discontinuities in frame elements in the form of ductility and failure mechanism has been assessed. And design recommendations in terms of response modification factors and designation of appropriate methods of analysis have been provided.

}, keywords = {Vertical irregularity; transfer beam; limited ductile buildings; response modification factor; failure hierarchy; analysis method}, doi = {https://doi.org/10.1080/13632469.2021.1964643}, url = {https://www.tandfonline.com/doi/abs/10.1080/13632469.2021.1964643}, author = {Alireza Mehdipanah and Elisa Lumantarna and Nelson Lam} } @conference {bnh-4334, title = {Methods of structural analysis of buildings in regions of low to moderate seismicity}, booktitle = {2017 World Congress on Advances in Structural Engineering and Mechanics}, year = {2017}, month = {09/2017}, address = {Seoul, Korea}, abstract = {

The paper introduces simplified methods for the analysis of multi-storey buildings for regions of low to moderate seismicity. Due to functional and architectural requirement most newly designed and existing buildings feature irregularities. The irregularities can be in a form of vertical irregularity (caused by discontinuity in load carrying elements) and plan irregularity (caused by cores that are eccentric ally placed within the buildings). Contemporary earthquake design standards and assessment procedures require dynamic analyses to be performed on such structures. However, dynamic analyses can be computationally expensive and require expert judgment, especially as far as three-dimensionally modelling is involved.

The early part of the paper presents the simplified method for the analysis of torsionally balanced (TB) buildings. Generalised modal displacements that were derived from parametric studies involving multi-storey buildings with vertical irregularities are introduced. The simplified method has been extended to account for the effects of torsion due to plan asymmetry to produce estimates of the maximum displacement demand at the edges of torsionally unbalanced (TU) buildings.

}, author = {Elisa Lumantarna and Alireza Mehdipanah and Nelson Lam and John Wilson} } @article {bnh-4505, title = {Methods of Structural Analysis of Buildings Incorporating Higher Modes Effects}, journal = {Australian Earthquake Engineering Society }, year = {2017}, pages = {10}, abstract = {

Dynamic analysis method has been suggested for the analysis of irregular buildings in the seismic standards. However, dynamic analyses can be computationally expensive and there are uncertainties associated with the selection of ground motion records for the regions of low to moderate seismicity. In a relevant research by the authors, it has been shown that linear response of irregular buildings featuring transfer beams resembles the response of regular buildings in the regions of low to moderate seismicity such as Australia. Hence, Generalised Lateral Force Method (GLFM) of Analysis is introduced and developed to incorporate the effects of higher modes based on generic modal displacement values. This method can be used for shear wall dominant RC buildings with or without transfer beam irregularity features. Shortcomings of the conventional Equivalent Static Analysis Method are resolved and the robustness of the method in estimating the seismic demands within the elastic limit is demonstrated by comparison with dynamic analyses.

}, keywords = {dynamic analysis method., higher mode effects, Multi-storey buildings, static analysis method}, url = {http://www.aees.org.au/wp-content/uploads/2018/02/463-Alireza-Mehdipanah.pdf}, author = {Alireza Mehdipanah and Elisa Lumantarna and Nelson Lam} } @article {bnh-4669, title = {Analytical Simulation of Limited Ductile RC Beam-Columns}, year = {2016}, month = {11/2016}, abstract = {

A systematic analytical modelling technique for the simulation of limited-ductile beamcolumn elements based on the concentrated plasticity model is proposed in this paper. The modelling technique employs a backbone curve for the monotonic behaviour of the limited ductile beam-column elements based on empirical equations. The hysteretic behaviour of the beam-columns in the cyclic loading is modelled and calibrated to results from experiments on columns obtained from the literature using OpenSEES software. The modelling technique provides an important tool for the seismic performance assessment of existing buildings which have been designed with considerations of low to no ductile detailing.

}, keywords = {Bond-Slip, Concentrated Plasticity Modelling Technique, Failure Mechanisms, Lightly Reinforced Columns, OpenSEES.}, url = {https://www.aees.org.au/wp-content/uploads/2018/06/331-Alireza-Mehdipanah-et-al.pdf}, author = {Alireza Mehdipanah and Nelson Lam and Elisa Lumantarna} } @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} }