A new damage index for RC buildings based on variations of nonlinear fundamental period

Massumi, Ali; Moshtagh, Ehsan

doi:10.1002/tal.656

Cited by 30 publications

(19 citation statements)

References 8 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The associated elongated fundamental period, being an implicit indicator of seismic damage, is a key issue for the accurate evaluation of structural performance into the nonlinear regime, and as such, it has long attracted scientific attention [2]. Several researchers [4][5][6][7][8] have also introduced damage models based on period elongation primarily to evaluate damage of reinforced concrete (R/ C) structures. Several researchers [4][5][6][7][8] have also introduced damage models based on period elongation primarily to evaluate damage of reinforced concrete (R/ C) structures.…”

Section: Introductionmentioning

confidence: 99%

Inelastic spectra to predict period elongation of structures under earthquake loading

Katsanos

Sextos

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

Summary Period lengthening, exhibited by structures when subjected to strong ground motions, constitutes an implicit proxy of structural inelasticity and associated damage. However, the reliable prediction of the inelastic period is tedious and a multi‐parametric task, which is related to both epistemic and aleatory uncertainty. Along these lines, the objective of this paper is to investigate and quantify the elongated fundamental period of reinforced concrete structures using inelastic response spectra defined on the basis of the period shift ratio (Tin/Tel). Nonlinear oscillators of varying yield strength (expressed by the force reduction factor, Ry), post‐yield stiffness (ay) and hysteretic laws are examined for a large number of strong motions. Constant‐strength, inelastic spectra in terms of Tin/Tel are calculated to assess the extent of period elongation for various levels of structural inelasticity. Moreover, the influence that structural characteristics (Ry, ay and degrading level) and strong‐motion parameters (epicentral distance, frequency content and duration) exert on period lengthening are studied. Determined by regression analyses of the data obtained, simplified equations are proposed for period lengthening as a function of Ry and Tel. These equations may be used in the framework of the earthquake record selection and scaling. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

Section: Introductionmentioning

confidence: 99%

Inelastic spectra to predict period elongation of structures under earthquake loading

Katsanos

Sextos

2015

Earthq Engng Struct Dyn

View full text Add to dashboard Cite

show abstract

“…The damage index and the periods of the first three modal periods were recorded at each step. Period elongation was then calculated using the following equation, where T elastic is the period before damage and T plastic is period of the latest damage state (Massumi and Moshtagh 2013).…”

Section: Theoretical Models and Analysismentioning

confidence: 99%

A new method to assess damage to RCMRFs from period elongation and Park–Ang damage index using IDA

Aghagholizadeh

Massumi

2016

Int J Adv Struct Eng

Self Cite

View full text Add to dashboard Cite

Despite a significant progress in loading and design codes of seismic resistant structures and technology improvements in building structures, the field of civil engineering is still facing critical challenges. An example of those challenges is the assessment of the state of damage that has been imposed to a structure after earthquakes of different intensities. To determine the operability of a structure and its resistance to probable future earthquakes, quick assessment of damages and determining the operability of a structure after an earthquake are crucial. Present methods to calculate damage to structures are time consuming and do not accurately provide the rate of damage. Damage estimation is important task in the fields of structural health monitoring and decision-making. This study examines the relationship between period elongation and the Park-Ang damage index. A dynamic non-linear analysis is employed with IDARC program to calculate the amount of damage and period of the current state. This new method is shown to be a quick and accurate technique for damage assessment. It is easy to calculate the period of an existing structure and changes in the period which reflects changes in the stiffness matrix.

show abstract

“…However, these revisions do not touch on the influence of the variable amplitude displacement history on the damage development, which causes the verification of the revised damage index to lack sufficient theoretical support. Another type of damage index describes the damage according to the change in the structural characteristics before and after damage, such as the stiffness [12][13][14], period [15], and deformation energy [16]. ese damage indexes do not directly contain the deformation damage term and energy dissipation term but reflect the results caused by two kinds of damage terms.…”

Section: Introductionmentioning

confidence: 99%

Research on the Estimation Method of the Stiffness Degeneration Index of Reinforced Concrete Members

Wang

Liu

Yang

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Based on variable amplitude displacement cycle tests of 24 reinforced concrete members with different reinforcement conditions, the stiffness degradation index was proposed to describe the damage. The relationship between the stiffness degradation index, the displacement history, and the cumulative energy dissipation was studied; on this basis, an estimation method for the stiffness degradation index was proposed. By comparing the experimental values and estimated values of the stiffness degradation index, the proposed method provides promising prediction reliability and accuracy. The stiffness degradation index has an effective relationship with the structural design parameters. Based on the stiffness degradation index, the reinforced concrete members can be divided into five performance levels: no damage (DK,k < 0), mild damage (0 < DK,k ≤ 0.3), moderate damage (0.3 < DK,k ≤ 0.7), severe damage (0.7 < DK,k ≤ 0.9), and destruction (0.9 < DK,k ≤ 1), which can provide a good reference for the seismic design of reinforced concrete members. The increase in the transverse reinforcement ratio can significantly reduce the stiffness damage, and the effect is more obvious under the conditions of small ductility. Under the same conditions, the smaller the ductility condition is, the smaller the stiffness damage of the reinforced concrete members will be. Therefore, the control of the ductility condition and the increase in the transverse reinforcement ratio are stable and effective methods for controlling the stiffness damage of reinforced concrete members.

show abstract

A new damage index for RC buildings based on variations of nonlinear fundamental period

Cited by 30 publications

References 8 publications

Inelastic spectra to predict period elongation of structures under earthquake loading

Inelastic spectra to predict period elongation of structures under earthquake loading

A new method to assess damage to RCMRFs from period elongation and Park–Ang damage index using IDA

Research on the Estimation Method of the Stiffness Degeneration Index of Reinforced Concrete Members

Contact Info

Product

Resources

About