Static versus modal analysis: influence on inelastic response of multi-storey asymmetric buildings

Ghersi, Aurelio; Marino, Edoardo M.; Rossi, Pier Paolo

doi:10.1007/s10518-007-9046-1

Cited by 22 publications

(14 citation statements)

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“…To the best of the authors' knowledge, there are only few studies based on such models. The pertinent publications are limited to the investigation of an existing building [24], to the study of highly idealized framed buildings with one axis of symmetry and under one-component motion [25,26] or to some idealized eccentric frame buildings, designed as symmetric [27]. Not only are these studies very limited, compared to those based on the simpliÿed one-storey shear-beam model, they also address other aspects of the problem than the work herein.…”

Section: Introductionmentioning

confidence: 99%

Inelastic torsion of multistorey buildings under earthquake excitations

Stathopoulos

Anagnostopoulos

2005

Earthquake Engng Struct. Dyn.

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SUMMARYThe inelastic earthquake response of eccentric, multistorey, frame-type, reinforced concrete buildings is investigated using three-and ÿve-storey models, subjected to a set of 10, two-component, semi-artiÿcial motions, generated to match the design spectrum. Buildings designed according to the EC8 as well as the UBC-97 code were included in the investigation. It is found that contrary to what the simpliÿed onestorey, typical, shear-beam models predict, the so-called ' exible' side frames exhibit higher ductility demands than the 'sti ' side frames. The substantial di erences in such demands between the two sides suggest a need for reassessment of the pertinent code provisions. This investigation constitutes one of the ÿrst attempts to study the problem of inelastic torsion by means of realistic, multistorey inelastic building models. Additional studies with similar or even more reÿned idealizations will certainly be required to arrive at deÿnite results and recommendations for possible code revisions.

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Section: Introductionmentioning

confidence: 99%

Inelastic torsion of multistorey buildings under earthquake excitations

Stathopoulos

Anagnostopoulos

2005

Earthquake Engng Struct. Dyn.

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“…Another method has been proposed by Bosco et al (2012), on the bases of previous studies by Ghersi and Rossi (2000), Calderoni et al (2002) and Ghersi et al (2007), who introduced the use of "corrective eccentricities" related to the elastic and inelastic parameters that define the torsional behavior of the building. These eccentricities are then used to define the application points of the load vectors, on either sides of the CM so as to obtain an envelope of plan distribution of maximum displacements.…”

Section: Extension Of Nsps To Plan-irregular Buildingsmentioning

confidence: 99%

Pushover Analysis for Plan Irregular Building Structures

Stefano

Mariani

2014

Perspectives on European Earthquake Engineering and Seismology

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Nonlinear static procedures (NSPs), also known as "pushover methods", represent the most used tool in the professional practice for assessment of seismic performance of building structures. Most of the methods subscribed by major seismic codes for seismic analysis of new or existing buildings have been originally defined for simple regular structures.Nevertheless, perfect regularity is an idealization that very rarely occurs and, in principle, the concept of irregularity itself is a fuzzy one. Most codes attempt to give a definition to the concept of "regularity", considering issues related to the distribution of mass, stiffness and strength in the building, both in plan and in elevation. Real buildings rarely comply with these regularity requirements, resulting in a barely reliable application of the basic NSPs. Code specifications concerning irregular structures are in need of improvement and they do not provide for clear and specific guidelines for the seismic analysis of such structures. Therefore the problem of the seismic evaluation of irregular structures is still an open one and basic issues need to be further explored.The present paper aims at providing a wide outlook on the problem of the seismic assessment of plan irregular building structures. Firstly, a brief review of the elastic and inelastic methods for the assessment of the torsional effects induced by in-plan irregularity is presented, mainly aimed at the definition of the variables governing the problem. Then, the basic features of the most important NSPs are discussed, followed by the description of the recent improvements developed for irregular structures. Since there is not yet a fully satisfactory solution, pros and cons of the various approaches are outlined, highlighting the most promising methods and the issues that are yet to be investigated. Finally, recommendations for code improvement are suggested.

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“…Second, no abrupt reduction of the lateral stiffness of the MRFs is expected until link failure is reached because yielding does not develop simultaneously at all the ends of the beams of a single storey. This is because the internal forces due to seismic actions are not equal at all ends of the beams and because the presence of gravity loads differentiates, often significantly, the overstrength at the ends of the beams [13,14].…”

Section: Design Interstorey Displacements For Moment Resisting Framesmentioning

confidence: 99%