Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Lumantarna, Elisa; Lam, Nelson; Wilson, John L.

doi:10.1080/13632469.2013.781557

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…The PSHA acceleration design spectra was fi rst transformed into acceleration-displacement response spectra format using the approach in the commentary to AS1170.4-2007. A 1500-year maximum response spectrum displacement (RSD max ) of 95 mm was obtained which corresponded to a T 2 corner period of 1.5 s. Torsional amplifi cation was accounted for using procedures outlined by Lumantarna et al (2008;2013), incorporating a two-way asymmetric torsional amplifi cation factor  DD of 1.7 giving a conservative estimate of peak drift demand (PDD) =  DD RSD max = 160 mm. It was found that drift estimates determined using upper bound displacement methods were typically 10% lower than those obtained from the ETABS response spectrum analysis.…”

Section: Seismic Modelling and Analysismentioning

confidence: 99%

Seismic design principles and methodology for the new Royal Adelaide Hospital

McBean¹

2015

AJSE

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When completed in 2016, the $1.85 billion new Royal Adelaide Hospital will be Australia's newest and most advanced major hospital, and one of the most complex building infrastructure projects delivered in the country. As a critical post disaster facility designed to meet BCA Importance Level 4 criteria, the structure is required to deliver the dual earthquake design performance objectives of collapse prevention for an earthquake with an annual probability of exceedance of 1:1500, together with maintaining full operational capability following a serviceability earthquake with an annual probability of exceedance of 1:500. The earthquake serviceability performance design criterion for Importance Level 4 structures was introduced in the 2007 edition of AS1170.4. The new Royal Adelaide Hospital is one of the fi rst major structures designed to comply with these new provisions. This paper outlines the engineering design processes and strategies adopted for the project to address both the collapse prevention and serviceability earthquake requirements.

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Section: Seismic Modelling and Analysismentioning

confidence: 99%

Seismic design principles and methodology for the new Royal Adelaide Hospital

McBean¹

2015

AJSE

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“…The issues with analysis of the torsional response of the dual system have been recognized as early as in the forties by Chitty [2]. Multiple attempts were made afterwards to generate simpler solutions mainly by considering numbers of simplified assumptions: the seismic load is taken by elements of the SW system and gravity load is taken by the MRF system [3,4], considering responses due to only fundamental mode [5], considering only two-dimensional motion [6], and idealizing multi-storey building into a single-storey model [7][8][9][10][11]. Because of these simplified assumptions, these studies have a very limited range of real application; for example: given that the stiffness parameters of the building can vary from floor to floor, using a single storey model resulted in an inaccurate estimation of these parameters.…”

Section: Introductionmentioning

confidence: 99%

Simplified Method of Determining Torsional Stability of the Multi-Storey Reinforced Concrete Buildings

Khatiwada

Lumantarna

2021

CivilEng

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This article proposes a simplified method for determining the elastic radius ratio of the multi-storey reinforced concrete building. The elastic radius ratio is the benchmark parameter of the buildings in determining torsional stability during an earthquake. When buildings are torsionally flexible, the torsional component of seismic response amplifies the overall response of the building. Because of the numbers of simplified assumptions such as the adoption of the single-storey model, much of the published articles have a very limited range of application. Quantifying the interaction of different forces in multi-story non-proportional buildings has been the main challenge of these studies. The proposed “shear and bending combination method” solves this by introducing parameters that can determine the relative influence of individual actions. Moreover, the proposed method applies to buildings with all type of structural systems, having asymmetry, and accidental eccentricity. The method is validated through a parametric study consisting of eighty-one building models and using computer analysis. The proposed method and the research findings of this study are useful in determining the torsional stability of the building, in verifying the results of the computer-based analysis, and in optimizing the structural system in the buildings.

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“…Many earlier investigations based on linear elastic analyses were aimed to develop a quasi-static analysis approach to simulate dynamic torsional behaviour of asymmetrical buildings [8][9][10][11][12]. More recent studies based on non-linear analyses focussed on evaluating existing approaches recommended by design provisions and published literature in predicting the torsional behaviour of asymmetrical buildings [13][14][15][16][17][18]. The major shortcoming of analytical investigations reported in the literature was the idealisation of the building into a single-storey floor model.…”

Section: Introductionmentioning

confidence: 99%

Fast Checking of Drift Demand in Multi-Storey Buildings with Asymmetry

et al. 2020

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Buildings possessing an asymmetrical arrangement of structural elements are torsionally unbalanced and can be vulnerable in a seismic event. Building codes of practices typically recommend the use of three-dimensional dynamic analysis to determine the seismic demands of a multi-storey building. Whilst most design practices are well equipped with commercial software for undertaking such analyses, designers often find it difficult to verify results. Much of the published technical articles present findings for buildings based on an idealised single-storey model. As a result of challenges in dealing with real multi-storey buildings, there has been very limited uptake of research findings in design practices. This article presents a three-tiered approach of estimating the displacement behaviour of the building in term of 3D/2D displacement ratio. The estimate can be used for verifying results reported from a computer package conveniently. The quick method provides predictions of the 3D/2D ratio and only requires the gross plan dimensions of the building to be known. The refined method requires knowledge of the torsional stiffness properties to be known, whereas the detailed method requires the eccentricity properties to be known as well. The proposed methodology is robust and reliable, as is demonstrated by case studies undertaken on six real multi-storey buildings.

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Displacement-Controlled Behavior of Asymmetrical Single-Story Building Models

Cited by 11 publications

References 29 publications

Seismic design principles and methodology for the new Royal Adelaide Hospital

Seismic design principles and methodology for the new Royal Adelaide Hospital

Simplified Method of Determining Torsional Stability of the Multi-Storey Reinforced Concrete Buildings

Fast Checking of Drift Demand in Multi-Storey Buildings with Asymmetry

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