Simplified elastic design checks for torsionally balanced and unbalanced low-medium rise buildings in lower seismicity regions

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

doi:10.12989/eas.2016.11.5.741

Cited by 6 publications

(11 citation statements)

References 16 publications

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“…• Consider higher mode effects [11,23,24,25,26] • Apply response spectrum in the analysis [11,23,24,25,26] • Easy to conduct and give accurate results for low rise buildings [11,23,24,25,26] • Based on the linear elastic stage of the structure, not consider nonlinear stage [11,23,24,25,26] In this research project, the major objective is to validate the GFM through result comparison between GFM and dynamic modal (computer simulation). To obtain precise results, four buildings with different heights ranging from 100m to 200m will be chosen to ensure the GFM can be extensively utilised.…”

Section: Methods Advantages Limitationsmentioning

confidence: 99%

“…T j is the natural period of j th mode. Typically, the mean ratio of second mode period (T 2 ) and third mode period (T 3 ) to effective mode period (T eff ) can be assumed to be 0.25 and 0.1 respectively (T 2 = 0.25 T eff and T 3 = 0.1 T eff ) [11]. And RSD(T j ) is the spectral displacement at the j th mode period (T j ) which is obtained from the response displacement spectrum vs natural period diagram.…”

Section: Analysis Of Gfmmentioning

confidence: 99%

“…Generalised Force Method (GFM), an enhanced version of analysis method, is aimed to analyse the performance and seismic response behaviour of buildings in regions of low to moderate seismicity [11]. It can give accurate results of estimates of the lateral displacement and storey shear.…”

Section: Introductionmentioning

confidence: 99%

“…It can give accurate results of estimates of the lateral displacement and storey shear. This method has been proved to be suitable for low rise buildings [11] and expected to be used for tall buildings. For low rise building, only the first mode is needed to be considered but it can give accurate results of seismic response.…”

Section: Introductionmentioning

confidence: 99%

“…Some are accurate based on the earthquake design standards, but the procedure is complex and needs expert judgement, such as linear dynamic analysis. However, GFM, which considers higher mode effects and response spectrum analysis, is relatively easy to conduct and can give reasonably accurate results of seismic responses of buildings [11].…”

Section: Introductionmentioning

confidence: 99%

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Simplified Method for Analysis of Tall Buildings in an Earthquake

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Li²,

Jin-zhao³

et al. 2019

AJCEA

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As for the earthquake design and assessment of the high rise structures, dynamic analysis is always required. However, dynamic analyses can be computationally expensive and require expert judgement. This research aims to introduce simplified methods to analyse the displacement and inter-storey drift of multi-storey buildings in regions of low to moderate seismicity. The generalised force method (GFM) is an approach that has been proved to be suitable for low rise buildings. GFM was first introduced by Lam, Lumantarna and Wilson to analyse the seismic effects of low-medium rise buildings. It can give accurate results of estimates of the deflection and internal forces. In the analysis of low rise building, GFM is based on the fundamental mode of vibration and the higher mode effects are not taken into consideration. However, in this research project, the existing GFM method is extended to be used for high rise building, which means that the higher vibration mode effects (including nth vibration modes) of the building is considered. In addition, the torsional effects of high rise buildings are also taken into consideration. This research will verify the accuracy of GFM by making comparison to the results from ETABS simulation. Four different tall buildings with varied heights ranging from 100m to 200m are analysed by both GFM and ETABS. And the results show that the displacement and inter-storey drift estimated by GFM are accurate and reliable.

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