Post-earthquake assessment of moderately damaged reinforced concrete plastic hinges

Marder, Kai; Elwood, Kenneth J.; Motter, Christopher J.; Clifton, G. Charles

doi:10.1177/8755293019878192

Cited by 20 publications

(19 citation statements)

References 15 publications

(16 reference statements)

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“…For the column with n = 0.2, the aftershock further reduces the initial stiffness by 7%, and this value is increased to 17% for the column with n = 0.4. A similar result of stiffness loss was found in the tests conducted by Marder et al, 33 which predicted the residual stiffness of test specimens following arbitrary earthquake-type loadings.…”

Section: Results Of Static Cyclic Testssupporting

confidence: 82%

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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Section: Results Of Static Cyclic Testssupporting

confidence: 82%

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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“…Marder et al [1] investigated the relationship between residual crack widths in reinforced concrete beams, peak drift demands, and reduction in stiffness. The study was based on a selection of beams from an experimental testing programme undertaken by Marder et al [2].…”

Section: Understanding Residual Capacitymentioning

confidence: 99%

Industry impact of QuakeCoRE Flagship Programme 4

Fox¹,

Keen

2022

BNZSEE

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QuakeCoRE is one of 10 Centres of Research Excellence funded by the New Zealand Tertiary Education Commission. With a focus on earthquake resilience of communities and societies, it has played a major role in addressing needs identified following the Christchurch Earthquake and other major events over the last decade. QuakeCoRE comprises a number of Flagship Programmes, including Flagship 4, which is entitled “Next-generation infrastructure: Low-damage and repairable solutions.” This paper aims to support turning research into practice by identifying the key areas of Flagship 4 that are likely to have an impact on the industry. Five key areas of impact were identified, based on a review of the published research, engagement with Flagship 4 leadership and the authors’ experience in the industry. For each area identified, summaries of the major research outcomes are provided, along with views as to how these can support the engineering practice.

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“…However, the exact reduction cannot be calculated because there is no information regarding the type of repair which would have been necessary and the corresponding environmental cost. Considering the growing evidence that more heavily damaged buildings could likely have been repaired without safety concerns (Marder et al 2020), it is not unreasonable to assume buildings with damage ratios up to 30% were repairable. Based on Fig.…”

Section: Quantification Of Environmental Impacts Of Demolitionsmentioning

confidence: 99%

Post-earthquake Demolition in Christchurch, New Zealand: A Case-Study Towards Incorporating Environmental Impacts in Demolition Decisions

Gonzalez

Stephens

Toma

et al. 2021

Springer Tracts in Civil Engineering

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The 2010/2011 Canterbury Earthquake Sequence resulted in severe loss and disruption in Christchurch, New Zealand due to liquefaction and damage from strong shaking. Following the earthquake, over 60% of concrete buildings with 3 + stories in the Christchurch CBD were demolished, resulting in a widespread displacement of people and business, an excess of $NZD 40 billion in losses, and significant environmental impacts from the demolition. Following the event, it was revealed that environmental impacts were not a direct consideration in demolition decision making. This paper provides a quantitative evaluation of the environmental impacts of the demolitions in Christchurch to highlight the importance of including environmental considerations when deciding between repair or demolition of a damaged building. First, the quantitative and qualitative factors that led to the demolitions following the Canterbury Earthquake Sequence are discussed to provide context for the argument that environmental impacts should be included in such considerations. Next, the environmental impacts of building demolitions in Christchurch are presented in terms of the embodied CO2 and energy in the building materials; the demolition process and waste disposal are not considered in this initial evaluation. Finally, a brief discussion on incorporating environmental impacts into the demolition decision making paradigm is presented. Moreover, consideration of environmental impacts of demolitions supports the need to move toward low-damage design in the future evolution of building codes.

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Post-earthquake assessment of moderately damaged reinforced concrete plastic hinges

Cited by 20 publications

References 15 publications

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

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

Industry impact of QuakeCoRE Flagship Programme 4

Post-earthquake Demolition in Christchurch, New Zealand: A Case-Study Towards Incorporating Environmental Impacts in Demolition Decisions

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