Seismic Performance of RC Bridge Column under Repeated Ground Motions

Park, S. W.; Yen, W. Phillip; Cooper, James D.; O'Fallon, John

doi:10.1061/(asce)1084-0702(2001)6:6(461)

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Using recorded ground motions Elnashai et al 1 showed that multiple events generate significantly more deformation demand than the isolated events. Park et al 2 looked at the seismic performance of scaled reinforced concrete bridge columns under repeated ground motions in the shake table experiments and showed that effective stiffness of a column decreases with an increase in the damage level due to the repeated ground motions. Bozorgnia and Bertero 3 considered a performance‐based seismic design philosophy to ensure that a structure remains fit to withstand the most critical event even after being subjected to a moderate event.…”

Section: Introductionmentioning

confidence: 99%

On frequency‐domain estimation of increase in design yield force levels of SDOF structures due to multiplicity of earthquake events

Naqvi,

Gupta,

Das

2023

Earthquake Engineering and Resilience

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The current earthquake design philosophy based on only the most critical earthquake may prove inadequate when the smaller events occurring before this event cause significant damage to the structure and repairs become infeasible. The design force levels may therefore be raised using the modified design force ratio, defined as the ratio of the yield force level for a specified damage level under all the seismic events to the yield force level for the same damage level under only the most critical event. This study considers the updating of the existing frequency‐based approach, using the power spectral density function (PSDF)‐based characterization of design ground motion, for the estimation of modified design force ratio spectrum. First, an empirical expression developed in the companion paper for modifying the damping of the equivalent linear oscillator is used such that the use of the PSDF compatible with 5%‐damping response spectrum leads to correct peak response, even when the equivalent damping ratio exceeds 5%. Next, the frequency‐domain design force ratio estimates are benchmarked in the case of steel and reinforced concrete oscillators by comparing those with the time‐domain estimates of equivalent Bouc–Wen oscillators over various sequences of events and by suitably adjusting the stiffness degradation parameter. It is shown in the case of a hypothetical seismic scenario that the optimal values of this parameter as 2.0 and 1.7 work well for the steel structures and reinforced concrete structures with high stiffness degradation respectively. Also, the proposed approach needs to be improved further for applicability in the case of reinforced concrete structures exhibiting significant pinching behavior.

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Section: Introductionmentioning

confidence: 99%

On frequency‐domain estimation of increase in design yield force levels of SDOF structures due to multiplicity of earthquake events

Naqvi,

Gupta,

Das

2023

Earthquake Engineering and Resilience

View full text Add to dashboard Cite

show abstract

“…Additionally, Twigden et al., 27 carried out shaking table tests on a cantilever column made of plain RC and coir fibre RC in ground motion sequences. Park et al., 28 investigated the seismic performance of an RC bridge column under repeated earthquake ground motions using a shaking table experiment. Furthermore, Van de Lindt 29 presented an experimental investigation of the effects of multiple earthquakes on wooden structures.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the damage accumulation of reinforced concrete columns under mainshock‐aftershock sequences

Sun

Zhai

Wang

2021

Earthq Engng Struct Dyn

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This paper presents the details and results of shaking table tests conducted on six 1/3‐scaled reinforced concrete columns subjected to mainshock‐aftershock (MSAS) ground motions. For each of the two subsets distinguished by the axial compression ratio in the test matrix, one column specimen was subjected to a standard cyclic loading protocol, whereas the second specimen was subjected to a mainshock ground motion record followed by a standard cyclic loading protocol. The third specimen was subjected to MSAS ground motion records followed by a standard cyclic loading protocol. The cyclic loading protocol was used to examine the degradation of the seismic capacity of the specimens. The intensity of the aftershock ground motion record was 0.68 times that of the mainshock ground motion record. The test results indicated that the damage accumulation of columns induced by the MSAS sequence is significant in the shaking table tests, and the MSAS‐induced maximum displacement of the specimen with an axial compression ratio of 0.4 was approximately twice as large as that induced by mainshock only. In comparison with the mainshock only case, the aftershock further reduced the structural strength and stiffness of the specimens by 9% and 7%, respectively. The ductility of the specimens tended to decrease with the increase of damage. The damage accumulation of the column with a higher axial compression ratio was more serious than that observed in a column with a lower axial compression ratio.

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Seismic Response of a Cable-Stayed Bridge considering Non-uniform Excitation Effect: Model Design and Shake Table Testing

Yang

Cai

2021

KSCE J Civ Eng

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Seismic Performance of RC Bridge Column under Repeated Ground Motions

Cited by 6 publications

References 14 publications

On frequency‐domain estimation of increase in design yield force levels of SDOF structures due to multiplicity of earthquake events

On frequency‐domain estimation of increase in design yield force levels of SDOF structures due to multiplicity of earthquake events

Experimental investigation on the damage accumulation of reinforced concrete columns under mainshock‐aftershock sequences

Seismic Response of a Cable-Stayed Bridge considering Non-uniform Excitation Effect: Model Design and Shake Table Testing

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