Spatial distribution of ductility demand and damage index in 3D RC frame structures considering directionality effects

Emami, Ali R.; Halabian, Amir M.

doi:10.1002/tal.1219

Cited by 16 publications

(11 citation statements)

References 28 publications

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“…Pushover analyses were conducted to quantify overall and story ductility capacities. The proposed procedure is summarized here since it was discussed in detail by Emami and Halabian . The procedure, anticipated to be performed in various planar directions, includes the following steps: (a) clockwise rotation of the model in plan for an angle of “ i ” with respect to the principal axes and (b) construction of appropriate lateral load scenarios to push the rotated model to reach collapse state but retaining it on x ‐axis as presented in Figure .…”

Section: Multi‐direction Pushover Analysismentioning

confidence: 99%

“…The proposed procedure is summarized here since it was discussed in detail by Emami and Halabian. [24] The procedure, anticipated to be performed in various planar directions, includes the follow-…”

Section: Multi-direction Pushover Analysismentioning

confidence: 99%

“…The concept of spatial response distribution which was initially introduced by the authors is described here with a slightly different description to simplify the formulas in a form of more practical and readable formats. Figure shows a typical floor plan of the Building 2B wherein notations and definitions have been presented.…”

Section: Spatial Distribution Of Ductility and Damage Indexmentioning

confidence: 99%

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Incremental dynamic collapse analysis of RC core‐wall tall buildings considering spatial seismic response distributions

Emami

Halabian

2017

Structural Design Tall Build

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Summary Despite wide‐ranging studies on fragility analysis and collapse safety assessment of short to medium‐rise reinforced concrete (RC) structures, a new interest in the topic is still valuable and even necessary for tall RC buildings. This study aims at establishing fragility relationships as well as collapse probability of high‐rise RC core‐wall buildings under maximum considered earthquake ground motions. This study is carried out in a probabilistic framework on a case study of a fully 3‐dimensional numerical model developed to simulate seismic behavior of a 42‐story building having a RC core‐wall system. Proposing planar and vertical distributions of ductility and damage indices, the incremental dynamic analysis, and the multi‐direction nonlinear static (pushover) analyses were employed to reach the research goal. Median collapse‐level capacities were defined in terms of seismic responses (e.g., ductility/damage indices) as well as several intensity measures by employing statistical analyses and cumulative density functions. Available and acceptable collapse margin ratios were next estimated to quantify collapse safety at maximum considered earthquake shaking level. On an average basis, the statistics indicated 9%–10% and 5%–6% collapse probability of the building subjected to near‐ and far‐field ground motions, respectively.

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Section: Multi‐direction Pushover Analysismentioning

confidence: 99%

Section: Multi-direction Pushover Analysismentioning

confidence: 99%

Section: Spatial Distribution Of Ductility and Damage Indexmentioning

confidence: 99%

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Incremental dynamic collapse analysis of RC core‐wall tall buildings considering spatial seismic response distributions

Emami

Halabian

2017

Structural Design Tall Build

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“…The fundamental vibration periods of the test structures along the in-plan principal directions are: T1X=0.576s and T1Y=0.698s, for six storeys; T1X=0.993s and T1Y=1.249s, for twelve storeys. Further details on their main dynamic properties can be found in previous work [10]. Six (i.e.…”

Section: Test Structuresmentioning

confidence: 99%

“…Many studies investigated the critical incidence angle of the two horizontal components of earthquakes acting on r.c. framed buildings [6][7][8][9][10]. The results indicate that often the nonlinear dynamic response predicted by seismic codes is not conservative, deriving from the combination of effects due to the horizontal components applied separately along each structural axis (e.g.…”

Section: Introductionmentioning

confidence: 97%

Multicomponent nonlinear incremental dynamic analysis of r.c. spatial framed structures subjected to near-fault earthquakes

Mazza¹,

Mazza²,

Liguori³

2016

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Fling-step and forward-directivity effects of near-fault ground motions can produce long duration intense velocity pulses in the horizontal direction, making unexpected ductility demand in reinforced concrete (r.c.) spatial framed structures designed in accordance with current seismic codes. In practice, simplified percentage-rule methods, in which a coefficient indicates the mutual participation between the two horizontal ground motions, are generally used to deal with the problem of the critical incidence angle of bi-directional ground motions. In order to investigate the orientation of the horizontal components of near-fault earthquakes that yields the maximum inelastic structural response, this work considers six-and twelve-storey r.c. framed buildings with symmetric plan are designed for a high-risk seismic region in line with the provisions of the Italian seismic code. A lumped plasticity model is used to describe the inelastic behaviour of the r.c. frame members, with flat surfaces approximating the axial load-biaxial bending moment domain at the end sections where inelastic deformations are expected. A multicomponent nonlinear incremental dynamic analysis is carried out with reference to different incidence angles of bi-directional earthquakes, which are scaled to four intensity levels to encompass a wide range of structural behaviours. To this end, seven nearfault ground motions are selected, based on the design hypotheses adopted for the test structures.

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Influence of seismic incident angle on response uncertainty and structural performance of tall asymmetric structure

Alam

Zhang

Samali

2020

Structural Design Tall Build

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SummaryThe estimation of critical seismic response of a structure is complicated in nature due to the uncertain distribution of the internal forces under multidirectional seismic excitations. One of the important concerns inherent to this complication is the uncertainty associated with the final design direction as different seismic directions result in different seismic responses. In this regard, this research provides a detailed examination of (1) response‐to‐response and record‐to‐record variability under varying seismic orientations, (2) quantification of seismic response uncertainties and (3) the seismic performance of asymmetric structure in the context of conservative/nonconservative seismic design. With the mentioned research objectives, a realistic case study asymmetric structure under the influence of varying bidirectional seismic excitations was evaluated. It has been argued in this research that the seismic excitations applied at structure's reference axes are very unlikely to demonstrate maximum response for all response quantities simultaneously, even if it results in a peak response for a particular seismic response quantity. This research is particularly helpful for the critical assessment of directionality influence on asymmetric structures prior to making any decision during thestructural design process. Substantial arguments have been presented to emphasize the inclusion of the investigation of seismic response uncertainty in practical design of critical asymmetric structures.

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Spatial distribution of ductility demand and damage index in 3D RC frame structures considering directionality effects

Cited by 16 publications

References 28 publications

Incremental dynamic collapse analysis of RC core‐wall tall buildings considering spatial seismic response distributions

Incremental dynamic collapse analysis of RC core‐wall tall buildings considering spatial seismic response distributions

Multicomponent nonlinear incremental dynamic analysis of r.c. spatial framed structures subjected to near-fault earthquakes

Influence of seismic incident angle on response uncertainty and structural performance of tall asymmetric structure

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