Static cyclic tests on lightly reinforced concrete shear walls

Greifenhagen, Christian; Lestuzzi, Pierino

doi:10.1016/j.engstruct.2005.06.008

Cited by 117 publications

(64 citation statements)

References 5 publications

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“…Some studies have been conducted on the seismic resistance of light weight aggregate concrete, results showed that under the same conditions, the seismic capacity of light weight aggregate concrete was much better than that of normal weight aggregate concrete, the porous light weight aggregate had the ability to increase the damping ratio of concrete [20][21][22]. During the past several years, scientists showed more interests in the properties of concrete which coarse aggregate was partly replaced by light weight aggravate.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and dynamic properties of high strength concrete modified with lightweight aggregates presaturated polymer emulsion

Tian

Shi

Jia

et al. 2015

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Mechanical and dynamic properties of high strength concrete modified with lightweight aggregates presaturated polymer emulsion

Tian

Shi

Jia

et al. 2015

Construction and Building Materials

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“…is alternative approach is based on a "push-over" analysis of the upper bridge. Experimental investigations have shown that reinforced concrete with low reinforcement is not necessarily associated with very poor seismic behavior, for example [12]. is method may obviously not be applied to the lower part of the dam because of its role in hydraulic retention.…”

Section: Displacement-based Approach "Push-over" Analysismentioning

confidence: 99%

Nonlinear Time-History Analysis for Validation of the Displacement-Based Seismic Assessment of the RC Upper Bridge of a Dam

Lestuzzi

Charif²,

Rossier³

et al. 2018

Advances in Civil Engineering

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e seismic assessment of a secondary structure of the Chancy-Pougny dam, namely, the upper bridge, is discussed in this paper. A first seismic assessment, performed according to classical force-based methodology, concluded the necessity of an extensive retrofitting for the upper bridge. By contrast, the application of the displacement-based approach showed that the current situation is already satisfactory, and therefore, practically no retrofitting is needed. e paper focuses on the nonlinear timehistory analyses which were achieved in order to check the accuracy of the results obtained using the displacement-based method.e structural characteristics of the reinforced concrete upper bridge are similar to those of conventional bridges. However, the piers were built with very little reinforcement and consequently they will exhibit a rocking behavior in case of earthquake loading. Rocking is rather a favorable failure mechanism and is related to a certain amount of displacement capacity. However, this behavior is not linked to plastic energy dissipation which may significantly increase the related displacement demand. In order to determine the real displacement demand, nonlinear time-history analyses were achieved with SDOF systems defined by an "S" shape hysteretic model. Spectrum compatible stationary synthetic accelerograms and slightly modified recorded earthquakes were both used for acceleration time-histories. e results showed that the displacement demand corresponds well with the one determined by usual push-over analysis. e results show a very favorable seismic situation, related to a relatively stiff structure associated to rock soil conditions with an A class soil. e seismic safety of the upper bridge is already satisfactory for the current state (without retrofitting). Consequently, the proposed costly reinforcement for the upper bridge could be significantly reduced.

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“…2). Reinforced concrete buildings are mostly shear walls buildings with low reinforcement ratios (Greifenhagen and Lestuzzi 2005). A specific characteristic in Switzerland is the wide spread construction of basement required for shelter against atomic bombs.…”

Section: Swiss Buildings Featuresmentioning

confidence: 99%

Seismic vulnerability assessment at urban scale for two typical Swiss cities using Risk-UE methodology

et al. 2016

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This paper contains a seismic assessment at urban scale of the cities of Sion and Martigny in Switzerland. These two cities have been identified for the present research based on their importance regarding size and the characteristics of the building stock for which information was available. Moreover, microzonation investigations are available for both cities. This results in a more accurate characterization of local expected ground shaking, which is expressed through specific response spectra. Sion and Martigny represent, respectively, the capital and second largest city of the canton of Valais. This region is characterized by the highest seismicity within Switzerland. The paper focuses on the assessment using Risk-UE methodology, namely the empirical method LM1 and the mechanical method LM2. The obtained results are compared in order to assess the related accuracy. Firstly, buildings of the two cities were surveyed in order to collect main structural characteristics in a database. Building stock is typical of that region and can be found similar to many other medium-sized Swiss cities. Around half of the buildings are unreinforced masonry buildings, while several others are reinforced concrete buildings with shear walls. Results show the most vulnerable part of the cities regarding earthquake. There are significant differences in global results between LM1 and LM2 methods. The mechanical LM2 method is more pessimistic since it predicts damage grades of about one degree higher than LM1 method. However, the main drawback of the empirical LM1 method is that an a priori determination of an adequate value of the macroseismic intensity is required. Nevertheless, LM2 method may lead to a global overestimation of damage prediction.

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Static cyclic tests on lightly reinforced concrete shear walls

Cited by 117 publications

References 5 publications

Mechanical and dynamic properties of high strength concrete modified with lightweight aggregates presaturated polymer emulsion

Mechanical and dynamic properties of high strength concrete modified with lightweight aggregates presaturated polymer emulsion

Nonlinear Time-History Analysis for Validation of the Displacement-Based Seismic Assessment of the RC Upper Bridge of a Dam

Seismic vulnerability assessment at urban scale for two typical Swiss cities using Risk-UE methodology

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