Response modification factor of elevated water tanks with reinforced concrete pedestal

Ghateh, Razmyar; Kianoush, Reza; Pogorzelski, W.

doi:10.1080/15732479.2015.1071855

Cited by 9 publications

(4 citation statements)

References 10 publications

(10 reference statements)

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“…Additionally, much research has been conducted on EWT's seismic performance with reinforced concrete (RC) water tanks and frame staging [8,9]. However, a limited number of studies have investigated the seismic performance of EWT with RC water tanks and RC shafts [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Innovative Reinforced Concrete Slit Shaft Configuration on Seismic Performance of Elevated Water Tanks

Gurkalo,

Poutos,

2023

Preprint

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Elevated water tanks are considered crucial infrastructure due to their significant role in supporting essential services. A strong ground motion may result in a failure or significant damage to a reinforced concrete shaft of an elevated water tank because a formation of plastic hinges is limited to the base of the shaft, while the nonlinear properties of the rest of the shaft remain underutilised. A modification was made to a reinforced concrete shaft to enhance the seismic resistance of elevated water tanks by introducing slit zones at regular intervals that partitioned the shaft into four segments interconnected by foundation and short linked beams positioned at 5 m intervals. The slit zones were intended to increase the shaft's ductility, reduce stress concentration in the lower part of the shaft, and provide uniform stress distribution throughout the shaft's height. The comparative nonlinear dynamic study between several three-dimensional models of elevated water tanks with slit and solid reinforced concrete shafts was conducted using SAP2000 software. The research findings showed that during a seismic event, reinforced concrete shafts with slits significantly reduce seismic response values at the shaft's base of elevated water tanks with tall and slender shafts compared to short and broad shafts.

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Section: Introductionmentioning

confidence: 99%

Effects of Innovative Reinforced Concrete Slit Shaft Configuration on Seismic Performance of Elevated Water Tanks

Gurkalo,

Poutos,

2023

Preprint

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“…The seismic response of concrete and steel tanks was extensively investigated through experimental and numerical methods [5][6][7][8]. Factors that affect the seismic response of tanks include the tank size [9], the soil-structure interaction [10], and the fluid-structure interaction [11]. Regarding the optimized design of elevated RC water tanks, to the best of the authors' knowledge, there was no research conducted to date.…”

Section: Introductionmentioning

confidence: 99%

Optimization Design of RC Elevated Water Tanks under Seismic Loads

et al. 2022

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This paper deals with the seismic column design of 35 elevated RC water storage tanks. Tanks comprise a top conic trunk reservoir, a column with variable hollow square cross-sections, and a shallow foundation on a sand layer. The five-column heights considered are 20, 25, 30, 35, and 40 m. The five tanks are subjected to seven degrees of seismic loading characterized by the reference peak ground acceleration in Eurocode 8. The elevated tanks are designed against the full prescriptions of Eurocode 2, Eurocode 8, and the Spaniard Structural Code of Practice. This includes variable loads for seismicity, wind, snow, etc., together with the action of self-weight and dead loads. The optimization design method considered is a variant of the old bachelor algorithm, an adaptive threshold acceptance method with a neighborhood move based on the mutation operator from genetic algorithms. Column results show the high nonlinearity of the problem since the horizontal seismic forces depend on the rigidity and height of the columns. The main features of the optimized tanks give guidance for the practical design of this kind of elevated RC water tank.

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“…The results of the survey indicated the validity and correctness of the R factor used in the current codes and standards. It showed that the size of the tanks affects the nonlinear seismic response behavior of the elevated water tanks (Ghateh et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Earthquake recurrence effect on the response reduction factor of steel moment frame

Abdollahzadeh

Sadeghi

2018

Asian J Civ Eng

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In this study, the effect of earthquake recurrence on the response modification factor (R factor) has been investigated. The response reduction factor of structures is one of the most important parameters for reducing the design force caused by earthquakes. An earthquake recurrence is a phenomenon caused by the accumulation of energy in faults and their continuous rupture. Given the release of energy in the faults, it is clear that the occurrence of an earthquake does not occur only once. It will often be accompanied by foreshocks and aftershocks. In some cases, the peak ground acceleration (PGA) of these foreshocks or aftershocks is as large as the main earthquake. Therefore, it is expected that the behavior of buildings under these seismic repetitions will vary with the behavior of structures under an earthquake. In this paper, the seismic behavior of moderate steel moment frames with 5, 10, and 15 floors was investigated under seven seismograms with repeating quakes. The calculation was done by performing the incremental dynamic analysis (IDA) on the R factor of these frames. The results show that the designed frames with the R factor from the main earthquakes (regardless of seismic sequence), faced with the dominant phenomenon of the main earthquake and its aftershocks, do not meet the expected performance. In this case, with the proposed correction factor, the response modification factor was modified. It was observed that the designed frames with the modified R factor under seismic sequence provided the desired performance expectations.

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Response modification factor of elevated water tanks with reinforced concrete pedestal

Cited by 9 publications

References 10 publications

Effects of Innovative Reinforced Concrete Slit Shaft Configuration on Seismic Performance of Elevated Water Tanks

Effects of Innovative Reinforced Concrete Slit Shaft Configuration on Seismic Performance of Elevated Water Tanks

Optimization Design of RC Elevated Water Tanks under Seismic Loads

Earthquake recurrence effect on the response reduction factor of steel moment frame

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