Response-based damage assessment of structures

Ghobarah, A.; Abou-Elfath, Hamdy; Biddah, Ashraf

doi:10.1002/(sici)1096-9845(199901)28:1<79::aid-eqe805>3.0.co;2-j

Cited by 300 publications

(144 citation statements)

References 7 publications

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“…It has been suggested that inter-storey drift alone may not be necessarily the best performance parameter to assess global damage, and that lateral stiffness is a more reliable measure of the likely damage to be experienced by a building [28]. Hence, recent studies have proposed to relate building damage with a change in the dynamic properties of RC frame buildings [28,29].…”

Section: Performance Levels and Global Damagementioning

confidence: 99%

“…Hence, recent studies have proposed to relate building damage with a change in the dynamic properties of RC frame buildings [28,29]. Based on this approach, the following equation can be used to relate damage of an RC frame at a given roof displacement as a function of its structural period at damage condition state (i.e.…”

Section: Performance Levels and Global Damagementioning

confidence: 99%

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Seismic behaviour of deficient RC frames strengthened with CFRP composites

Garcia

Hajirasouliha

Pilakoutas

2010

Engineering Structures

117

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A full-scale two-storey RC building with poor detailing in the beam-column joints was tested on a shake table as part of the European research project ECOLEADER. After the initial tests which damaged the structure, the frame was strengthened using carbon fibre reinforced materials (CFRPs) and re-tested. This paper investigates analytically the efficiency of the strengthening technique at improving the seismic behaviour of this frame structure. The experimental data from the initial shake table tests are used to calibrate analytical models. To simulate deficient beam-column joints, models of steel-concrete bond-slip and bond-strength degradation under cyclic loading are considered. The analytical models are used to assess the efficiency of the CFRP rehabilitation using a set of medium to strong seismic records. The CFRP strengthening intervention enhanced the behaviour of the substandard beam-column joints, and resulted in substantial improvement of the seismic performance of the damaged RC frame. It is shown that, after the CFRP intervention, the damaged building would experience on average 65% less global damage compared to the original structure if it was subjected to real earthquake excitations.2

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Section: Performance Levels and Global Damagementioning

confidence: 99%

Section: Performance Levels and Global Damagementioning

confidence: 99%

Seismic behaviour of deficient RC frames strengthened with CFRP composites

Garcia

Hajirasouliha

Pilakoutas

2010

Engineering Structures

117

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“…It is recognized a direct relationship between the number of inelastic cycles and damage (Krawinkler et al 1983), (Stephens & Yao 1987). Various models have been developed to quantify this relationship (Cosenza et al 1993) (Ghobarah et al 1999); two well-known relationships describing the cumulative damage are the normalized cumulative ductility and the Coffin-Manson law for low-cycle fatigue in conjunction with the Miner's rule of linear damage accumulation. Both models show a direct relationship between structural damage and the number and amplitude of damaging cycles.…”

Section: Generalmentioning

confidence: 99%

“…A direct relationship between the number of inelastic cycles and damage can be assumed (Krawinkler et al 1983), (Stephens and Yao 1987). Various models have been developed to quantify this relationship (Cosenza et al 1993) (Ghobarah et al 1999). In order to capture the behavior under ground motion excitations, most of current testing protocol developments and experimental studies have been conducted based on a general cumulative damage concept using the CoffinMason model and the Miner's rule of linear damage accumulation as a baseline (Krawinkler et al 1983).…”

Section: Cumulative Damagementioning

confidence: 99%

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

Dusicka¹,

Bazaez²,

Knoles³

2015

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Research was conducted to investigate the effect of subduction zone earthquakes on structural damage. The study suggests that large magnitude ground motions of long duration have the potential of significantly increasing the number of inelastic excursions and consequently incur more extensive structural damage as compared to ground motions with similar elastic spectral demands but of shorter duration. This increase in demand plays a crucial role in the Pacific Northwest where a mega subduction zone earthquake is impending. Typical reinforced concrete bridge bents constructed in the 1950 to mid-1970 in the State of Oregon were designed and built with minimum seismic considerations. This resulted in inadequate detailing within plastic hinge zones, leaving numerous RC bents highly susceptible to damage following an earthquake. In this study, the cyclic performance of an asbuilt RC square column and a reinforced concrete bridge bent retrofitted using buckling restrained braces (BRBs) was experimentally evaluated using quasi-static cyclic loading protocols aiming to reflect subduction zone earthquake demands up to displacement ductility. The buckling restrained braces were designed as replaceable elements in order to take the earthquake-induced energy and dissipate it through nonlinear hysteretic behavior. Two BRB designs were considered in the study in an effort to assess the influence of BRB stiffness on the overall structural performance. The results of these large-scale experiments successfully demonstrated the effectiveness of utilizing buckling restrained braces for achieving high displacement ductility of the retrofitted structure, while also controlling the damage of the existing vulnerable reinforced concrete bent up to the design performance levels. The potential of improving the overall seismic behavior and the design performance levels with BRBs offers structural design professionals a viable method for performance driven retrofit of reinforced concrete bents. 17. Key Words Subduction zone earthquakes, reinforced concrete bridge bents, plastic hinge zone, performance levels, bridge seismic retrofit, quasi-static loading protocol, buckling restrained braces.18. Distribution Statement: Copies available from NTIS, and online at

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“…Various damage indices have been proposed using different parameters such as drift, natural period of structure, energy absorption and cyclic fatigue such as Bozorgnia-Bertero [1], Park-Ang [2], Krawinkler-Zohrei [3], Roufaiel-Meyer [4], Dipasquale-Cakmak [5], and Ghobara [6] indices. They are divided into two broad categories: noncumulative and cumulative damage indices.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Behavior of Steel Moment-Resisting Frames with Different Bracing Systems Based on a Response-Based Damage Index

Karsaz

Tosee

2018

CivileJournal

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Seismic rehabilitation of existing buildings is one of the most effective ways to reduce damages under destructive earthquakes. The use of bracings is one of techniques for seismic rehabilitation of steel structures. In this study we aimed to investigate the seismic performance of three 5, 10 and 15-storey steel structures with moment-resisting frames designed three dimensionally in ETABS 2015 application based on first edition of Iranian Standard 2800. Their damage under five ground motions was evaluated using response-based damage model proposed by Ghobara et al. (1999). Then, the structures were rehabilitated with different bracing systems (X, eccentric and concentric V and inverted-V) and, again, their damage under five earthquakes were evaluated and compared with those of moment resisting frames. The pushover analysis results indicated that X-braced frame was the least ductile system but had highest initial stiffness and yield stress. In low-rise building, X-braced frames showed better performance among studied bracing systems compared to moment resisting frames, while mid and high-rise buildings with eccentrically braced frame (EBF) showed the best behavior against earthquakes with the least damage. Moreover, it was found out that EBFs' performance increases by increasing storey height, but for concentrically braced frames (CBFs) it was decreased. We concluded that the use of response-based damage models can be a suitable procedure for estimating the vulnerability of steel structures rehabilitated with bracing system.

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Response-based damage assessment of structures

Cited by 300 publications

References 7 publications

Seismic behaviour of deficient RC frames strengthened with CFRP composites

Seismic behaviour of deficient RC frames strengthened with CFRP composites

Bridge Seismic Retrofit Measures Considering Subduction Zone Earthquakes

A Comparative Study on the Behavior of Steel Moment-Resisting Frames with Different Bracing Systems Based on a Response-Based Damage Index

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