Dynamic eccentricities and the “capable near collapse centre of stiffness” of reinforced concrete single-storey buildings in pushover analysis

Bakalis, Athanasios P.; Makarios, Triantafyllos K.

doi:10.1016/j.engstruct.2018.03.056

Cited by 13 publications

(28 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the extensive parametric investigation [1] as well as by the recently international literature review [2,3,4], the main conclusions and the proposed methodology are summarized below:…”

Section: Methodsmentioning

confidence: 99%

“…Of the four sign combinations of the two accidental eccentricities and , four displaced CM positions are defined. Three pairs of horizontal accelerograms [1] consisting of five artificial accelerograms (created by Seismosoft [12]) are used that have similar characteristics with the Hellenic tectonic faults [13]. Each pair is rotated about the vertical axis successively per 22.5 o , to find the worst seismic load state [14] of the 16 TH analyses obtained for each pair.…”

Section: Time History Analysismentioning

confidence: 99%

“…To seismically assess the seismic bearing capacity of a building, the basic method of analysis proposed by all contemporary seismic codes is the static nonlinear method of analysis (pushover). For documented application of pushover analysis on asymmetric single-storey buildings, the lateral static floor load should be applied with eccentricity relative to the Mass Centre of the diaphragm and should also be properly oriented along each horizontal principal axis of the building [1]. This is the only way to consider the phenomenon of the development of diaphragm torsional vibration about vertical axis coupled to translational ones, due to the developing inertial torsional (about Z-axis) moment of the building floor, a phenomenon occurring both in linear and in non-linear areas [1,2,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…For documented application of pushover analysis on asymmetric single-storey buildings, the lateral static floor load should be applied with eccentricity relative to the Mass Centre of the diaphragm and should also be properly oriented along each horizontal principal axis of the building [1]. This is the only way to consider the phenomenon of the development of diaphragm torsional vibration about vertical axis coupled to translational ones, due to the developing inertial torsional (about Z-axis) moment of the building floor, a phenomenon occurring both in linear and in non-linear areas [1,2,3,4]. Eurocode EN 1998-1 [5] suggests that the position of the Mass Centre (where the external lateral static floor force is applying) must be moved by the floor accidental eccentricity, but in this way, there is still the inability to obtain the inertial torsional moment of the diaphragm.…”

Section: Introductionmentioning

confidence: 99%

“…Eurocode EN 1998-1 [5] suggests that the position of the Mass Centre (where the external lateral static floor force is applying) must be moved by the floor accidental eccentricity, but in this way, there is still the inability to obtain the inertial torsional moment of the diaphragm. Both in recent work [1] and the current one, where a numerical example is presented, the use of suitable dynamic eccentricities is proposed, in order to determine the point of application of the lateral static floor force in the plan. The calculation of, first, the starting point for the measurement of the dynamic eccentricities, second, the appropriate orientation direction of the lateral static floor force and third, the magnitude of the dynamic eccentricities are the threefold objective of the present paper, where the theoretical analysis has been given in [1].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Bakalis

Makarios

2020

Seismic Behaviour and Design of Irregular and Complex Civil Structures III

Self Cite

View full text Add to dashboard Cite

Α new version about a method of documented application of pushover analysis on asymmetric single-storey buildings has been presented, recently. The main target of this new method was to rationally consider the coupling between torsional (about vertical axis) and translational vibrations of asymmetric singlestorey building diaphragm under translational seismic excitation of its base. For this reason, the equivalent lateral static floor force according to the new method is applied using suitable dynamic eccentricities, eccentric to building Mass Centre, which are added with the accidental eccentricities, in such a way that the final design eccentricities move the application point of floor, external, lateral, static force away from the diaphragm Mass Centre. The origin point for measuring the dynamic eccentricities is called "Capable Near Collapse Centre of Stiffness ". Also, the floor lateral static force must be oriented along the building principal axes which are called "Capable Near Collapse Principal Axes" and , respectively. The appropriate dynamic eccentricities for the stiff-side and the flexible-one of the floor plan derive from extensive parametric analysis and are calculated by graphs and suitable equations. In the present work, a numerical example of an asymmetric single-storey building is presented to illustrate clearly and in detail the step by step application of the proposed pushover analysis method. It is a torsional sensitive reinforced concrete building designed in accordance with Eurocodes EN 1992-1 and 1998-1 for ductility class high (DCH). The proposed method is evaluated relative to the results of non-linear response history analysis (ΤΗ). The final results show that the proposed method of pushover analysis predicts with safety the displacement of the stiff side of the building as well as that of the flexible side.

show abstract

“…From the extensive parametric investigation [1] as well as by the recently international literature review [2,3,4], the main conclusions and the proposed methodology are summarized below:…”

Section: Methodsmentioning

confidence: 99%

Section: Time History Analysismentioning

confidence: 99%