CUMULATIVE PLASTIC DEFORMATION AS A LOCAL DAMAGE INDEX OF MOMENT RESISTING FRAMES IN STORY LEVEL

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GERAMI MOHSEN; DANESHJOU FARHAD

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Paper Information

Journal: JOURNAL OF SCHOOL OF ENGINEERING Year:2007 | Volume:19 | Issue:1 (CIVIL ENGINEERING ISSUE) Page(s): 51-66

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Title

CUMULATIVE PLASTIC DEFORMATION AS A LOCAL DAMAGE INDEX OF MOMENT RESISTING FRAMES IN STORY LEVEL

Author(s)

GERAMI MOHSEN | DANESHJOU FARHAD | Issue Writer Certificate

Keywords

SEISMIC BEHAVIORQ3

STRENGTH AND DUCTILITY DEMANDQ3

DAMAGE INDEXQ3

STEEL MOMENT RESISTING FRAMESQ3

CUMULATIVE PLASTIC DEFORMATIONQ3

Abstract

FEMA273 provisions relate maximum deformation demands to performance levels, while such relations have not been provided for cumulative deformation demands of the elements. On the other hand, the factor of cumulative deformation demand may be regarded as a criterion for damage level, which can present a different feature of the structure response under maximum deformation demands. In order to compare the parameters of maximum and cumulative demands, a case study was implemented on 4, 10 and 25 story and 3 bay frames under Manjil earthquake ground motion. In this study three maximum responses and cumulative drift response of the frames’ stories have been measured and evaluated. The cumulative damage results, corresponding to Life Safety and Collapse Prevention levels, are of great importance and may affect higher performance levels, such as repairable damages. The rate of damage, applied to the structure, is evaluated by DAMAGE INDEXes (which are function of structure ductility, the energy dissipated in the structure, period, number of loading cycles, maximum story displacement limit and etc.) and its numerical value is related to the damage applied to an element or to whole the structure based on a certain classification. In this study maximum story displacement limit (Ddps,i) is presented as an index of structural damage in story level. It was resulted that the estimation of cumulative deformation demands in inelastic structures (subjected to long duration ground motions with considerable effects of higher modes and due to the increase in the number of inelastic cycles) is an important and critical factor in evaluation of STEEL MOMENT RESISTING FRAMES’ demands. It was also seen that the difference between maximum values and CUMULATIVE PLASTIC DEFORMATION (caused by maximum demand locations in height of the structure or due to the amplitude of relative demands between different stories) is considerably increased in top stories of the structure, which can be ascribed to the increase in number of inelastic cycles in top stories and to the higher mode effects.

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References

HIGHER MODE EFFECTS ON SEISMIC BEHAVIOR OF MDOF STEEL MOMENT RESISTING FRAMES

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APA: Copy

GERAMI, MOHSEN, & DANESHJOU, FARHAD. (2007). CUMULATIVE PLASTIC DEFORMATION AS A LOCAL DAMAGE INDEX OF MOMENT RESISTING FRAMES IN STORY LEVEL. JOURNAL OF SCHOOL OF ENGINEERING, 19(1 (CIVIL ENGINEERING ISSUE)), 51-66. SID. https://sid.ir/paper/22606/en

Vancouver: Copy

GERAMI MOHSEN, DANESHJOU FARHAD. CUMULATIVE PLASTIC DEFORMATION AS A LOCAL DAMAGE INDEX OF MOMENT RESISTING FRAMES IN STORY LEVEL. JOURNAL OF SCHOOL OF ENGINEERING[Internet]. 2007;19(1 (CIVIL ENGINEERING ISSUE)):51-66. Available from: https://sid.ir/paper/22606/en

IEEE: Copy

MOHSEN GERAMI, and FARHAD DANESHJOU, “CUMULATIVE PLASTIC DEFORMATION AS A LOCAL DAMAGE INDEX OF MOMENT RESISTING FRAMES IN STORY LEVEL,” JOURNAL OF SCHOOL OF ENGINEERING, vol. 19, no. 1 (CIVIL ENGINEERING ISSUE), pp. 51–66, 2007, [Online]. Available: https://sid.ir/paper/22606/en

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