Seismic Performance of Concentrically Braced Steel Frames in Multistory Buildings with Mass Irregularity

Tremblay, Robert; Poncet, Laure

doi:10.1061/(asce)0733-9445(2005)131:9(1363)

Cited by 76 publications

(45 citation statements)

References 20 publications

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“…variations in mass do not necessarily result in increase in plastic demands, is consistent with conclusions from other researches (e.g. Tremblay and Poncet 2005). With regard to strength irregularity, it was found that only overstrength of beams results in increased plastic demands, while overstrength in columns, and its variation along the building height, causes almost negligible effects.…”

Section: Vertically Irregular Structures-setback Multi-storey Buildingssupporting

confidence: 91%

“…The aim of Tremblay and Poncet (2005) was again to determine whether or not dynamic analysis is really needed for vertically irregular structures, as stipulated by major seismic codes. However, they focused particularly on buildings with mass irregularity, as shown in Fig.…”

Section: Vertically Irregular Structures-setback Multi-storey Buildingsmentioning

confidence: 99%

“…In addition, the suitability of criteria provided by many codes in order to detect irregularity in elevation was verified by investigating the actual increase in inelastic demands of the analyzed models as compared to their regular counterparts, as well as any deterioration of seismic performance. Results suggested that criteria specified by major international codes are unable to identify the regular or irregular status of a building, especially in the presence of irregular distributions of masses and Tremblay and Poncet (2005) strengths. Regarding mass irregularity, their finding, i.e.…”

Section: Vertically Irregular Structures-setback Multi-storey Buildingsmentioning

confidence: 99%

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A review of research on seismic behaviour of irregular building structures since 2002

Stefano

Pintucchi

2007

Bull Earthquake Eng

204

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The paper presents an overview of the progress in research regarding seismic response of plan and vertically irregular building structures. Three areas of research are surveyed. The first is the study of the effects of plan-irregularity by means of single-storey and multi-storey building models. The second area encompasses passive control as a strategy to mitigate torsional effects, by means of base isolation and other types of devices. Lastly, the third area concerns vertically irregular structures and setback buildings. Although fewer papers have been published in this last area with respect to the former ones, this state-of-theart reports extensively on research efforts and progress into the seismic behaviour of irregular buildings in elevation to show the growing interest among specialists in the field.

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Section: Vertically Irregular Structures-setback Multi-storey Buildingssupporting

confidence: 91%

Section: Vertically Irregular Structures-setback Multi-storey Buildingsmentioning

confidence: 99%

Section: Vertically Irregular Structures-setback Multi-storey Buildingsmentioning

confidence: 99%

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A review of research on seismic behaviour of irregular building structures since 2002

Stefano

Pintucchi

2007

Bull Earthquake Eng

204

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“…In the literature there are many studies (among others: Moehle [2]; Valmundsson and Nau [3]; Ali and Krawinkler [4]; Das and Nau [5]; Chintanapakdee and Choprs [6]; Tremblay and Poncet [7]; Michalis et al [8]; McCrum and Broderikh [9]) on the seismic behavior of structures with mass, stiffness and strength irregularities. However, there are just few studies on the behavior of frames with discontinuous LFRSs as follows.…”

Section: Introductionmentioning

confidence: 99%

Seismic Behavior of Concentrically Braced Steel Frames with Out-of-Plane Offset Irregularity

Mohebkhah¹,

Akefi²

2017

TOCIEJ

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Braced steel frames are sometimes designed with out-of-plane shifted bracing members on the first story due to architectural or functional considerations. Such frames are classified and designated as frames having the Type-4 horizontal structural irregularity entitled "frames with out-of-plane offset irregularity" as per the Minimum Design Loads for . The purpose of this study is to investigate the nonlinear seismic behavior of ordinary steel concentrically braced frames with out-of-plane offset irregularity and evaluate their seismic design parameters. To this end, two 3-story and 6-story three-dimensional ordinary concentrically braced frames (OCBFs) with and without out-of-plane offset of one of the vertical elements on the first story were considered (i.e. irregular and regular configurations). The seismic design parameters considered in this study includes: frame overall overstrength factor, column overstrength factor and the inelastic dynamic inter-story drift demands. Nonlinear time-history dynamic analysis of the frames showed that overall overstrength factor of the low-and mid-rise irregular frames studied in this research is lower than that of the regular ones. Moreover, it was found that the Seismic Provisions prescribed overstrength factor (i.e. Ω o =2.0) to amplify columns axial seismic forces in OCBFs is not conservative for the studied regular frames' columns as well as the columns in the vicinity of the shifted bracing members on the first story of the irregular frames. Also, it was shown that the studied low-and mid-rise regular and irregular concentrically braced frames experience greater inter-story drift demands than predicted by the amplified elastic analysis proposed in the codes.

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“…Limited number of studies has been done on irregularities of the building. [4] This paper tells us that two methods have been used for determining the mass irregularities in multi storey structure. The two methods are the equivalent static force procedure and the response spectrum analysis method.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Expected Seismic Performance on Existing Buildings: A Case Study

Kumar¹

2016

IOSR

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Seismic Performance of Concentrically Braced Steel Frames in Multistory Buildings with Mass Irregularity

Cited by 76 publications

References 20 publications

A review of research on seismic behaviour of irregular building structures since 2002

A review of research on seismic behaviour of irregular building structures since 2002

Seismic Behavior of Concentrically Braced Steel Frames with Out-of-Plane Offset Irregularity

Investigation of Expected Seismic Performance on Existing Buildings: A Case Study

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