Principal directions under lateral loading in multistorey asymmetric buildings

Athanatopoulou, Asimina; Doudoumis, Ioannis

doi:10.1002/tal.385

Cited by 27 publications

(32 citation statements)

References 6 publications

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“…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. Finally, the envelope of the displacements along the axes και from all these TH analyses (192) was the "seismic target-displacement" for each control position in plan.…”

Section: Time History Analysismentioning

confidence: 99%

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Bakalis

Makarios

2020

Seismic Behaviour and Design of Irregular and Complex Civil Structures III

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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.

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Section: Time History Analysismentioning

confidence: 99%

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Bakalis

Makarios

2020

Seismic Behaviour and Design of Irregular and Complex Civil Structures III

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“…the expressions connecting the ASIcrit with the geometrical and mechanical characteristics of the buildings are still applicable after performing some modifications. Buildings for which an elastic axis and principal bending planes can be defined belong to one of the following categories of systems (Riddel and Vasquez 1984;Makarios and Anastassiadis 1998;Athanatopoulou and Doudoumis 2008): systems with two horizontal axes of symmetry in plan view, isotropic systems, ortho-isotropic systems and complex-isotropic (coaxial) systems. All the previously mentioned systems have principal bending planes (I-III, II-III) the intersection of which defines the elastic axis III of the system.…”

Section: Determination Of the Critical Angle Of Incidence In Multi-stmentioning

confidence: 99%

Analysing the Critical Orientation of Seismic Loading in 3D Buildings: Preliminary Results for Constant Lateral Forces

Skoulidou

Romão

2018

UPjeng

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The angle of seismic excitation has been proven to be an important factor when analysing the 3D behaviour of buildings. However, modern earthquake-related standards only cover partially the effects of this factor and practicable results of relevant studies are still limited. The proposed paper focuses on the determination of the critical angle of incidence based on the building's structural characteristics. An analytical expression is developed to define the critical angle for the case of single storey buildings and a special category of multi storey buildings under constant lateral forces assuming linear elastic behaviour of the structures.

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“…A similar method for estimating the location of the so‐called optimum torsional axis by minimizing the sum of the squares of floor rotations of a building subjected to a set of static loads can be found in the work of Marino and Rossi (). The validity of the optimum torsional axis was also investigated by Makarios et al () and Athanatopoulou and Doudoumis ()…”

Section: Lateral‐torsional Coupling Effects On Torsionally Irregular mentioning

confidence: 99%

“…A similar method for estimating the location of the so-called optimum torsional axis by minimizing the sum of the squares of floor rotations of a building subjected to a set of static loads can be found in the work of Marino and Rossi (2004). The validity of the optimum torsional axis was also investigated by Makarios et al (2006) and Athanatopoulou and Doudoumis (2008) By using the same approach, the eccentricity in the Y-direction (e y ) resulting in a minimum sum of the squares of floor rotations at the locus of the CMs caused by the first uncoupled X-translational inertia forces F → 1X can also be determined as follows:…”

Section: Equations Of Motionmentioning

confidence: 99%

Evaluation of lateral‐torsional coupling in earthquake response of asymmetric multistory buildings

Yiu

Chan

Huang

et al. 2013

Structural Design Tall Build

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SUMMARY This paper presents a practical method for evaluating lateral‐torsional coupling in the elastic earthquake response of asymmetric multistory buildings. A transformation technique is first developed to shift the floor centers of mass of an asymmetric building to new reference positions where the sum of the squares of all floor rotations of the building due to lateral inertia loads is a minimum. By setting the locus of the floor centers of mass of the building at the new reference positions, a representative eccentricity and an effectively uncoupled system for the building can be established on the basis which an equivalent eccentric single mass system can be developed. The additional lateral translations caused by seismic torsional effects in the building can be analytically determined and expressed in terms of the representative building eccentricity and the uncoupled periods evaluated using the effectively uncoupled system. The effectiveness and practicality of the proposed method are illustrated with two 30‐story practical buildings. Copyright © 2013 John Wiley & Sons, Ltd.

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Principal directions under lateral loading in multistorey asymmetric buildings

Cited by 27 publications

References 6 publications

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Dynamic Eccentricities in Pushover Analysis of Asymmetric Single-Storey Buildings

Analysing the Critical Orientation of Seismic Loading in 3D Buildings: Preliminary Results for Constant Lateral Forces

Evaluation of lateral‐torsional coupling in earthquake response of asymmetric multistory buildings

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