Measurement of ice pressure on a concrete dam with a prototype ice load panel

Hellgren, Rikard; Malm, Richard; Fransson, Lennart; Johansson, Fredrik; Nordström, Erik; Wilde, Marie Westberg

doi:10.1016/j.coldregions.2019.102923

Cited by 6 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These ice load events predominantly last from hours up to a day, but can in some cases, last several days [11]. Figure 1 shows examples of time-histories containing three ice load events, one idealized time-history from a design guideline [20] and one measured time history, from Hellgren et al [21]. This event-shaped time history is caused by a combination of the loading mechanisms and the mechanical behavior of the ice.…”

Section: Event-based Approachmentioning

confidence: 99%

“…Illustration of ice load events with an idealized and real case. The idealized case is after ISO-19906 [20] and the example from Hellgren et al [21].…”

Section: Event-based Approachmentioning

confidence: 99%

“…Rätan hydropower dam (RTN) in the river Ljungan, is a 31 m high concrete buttress dam constructed in 1968 and located 20 km north of the geographic midpoint of Sweden, in the northern ice load region. At Rätan, ice load measurements have been performed using a load panel between 2015-2021, see in [19,21]. Monolith 15, the monolith where the load panel is attached, is included in this study.…”

Section: Rätanmentioning

confidence: 99%

“…In analysis 1-II, the transient simulation with ice load, the magnitude of the measured ice loads from [19,21] was applied as a uniform pressure on a one-meter high surface under the maximum water level. These data were used for all included dams.…”

Section: Finite Element Analysesmentioning

confidence: 99%

See 3 more Smart Citations

Estimating the Ice Loads on Concrete Dams Based on Their Structural Response

Hellgren

Enzell

Ansell

et al. 2022

Water

Self Cite

View full text Add to dashboard Cite

In the assessment of concrete dams in cold climate, it is common that the theoretical stability becomes insufficient for load cases that include ice loads. However, the magnitude and return period of these ice loads have a high degree of uncertainty. This study estimates the magnitude of ice loads on eight concrete dam monoliths using measurements of their displacement from 29 winters. In the displacement signals, events are identified and assumed to be caused solely by ice loads. The observed displacement during an event is interpreted as an ice load using a load–displacement relationship derived from FE simulations of each dam. These simulations show that ice loads of the magnitudes given in design guidelines and recorded in previous measurements would significantly affect the structural response of the studied dams. However, only small traces of ice loads can be found in the observed responses of the studied dams. The estimated ice loads are significantly lower than the ice loads recorded in traditional ice load measurements. These results indicate that the average magnitude of ice load on an entire monolith is significantly lower than the measured local pressures. This would imply that ice loads may be a smaller concern regarding dam safety than previously believed.

show abstract

Section: Event-based Approachmentioning

confidence: 99%

“…Illustration of ice load events with an idealized and real case. The idealized case is after ISO-19906 [20] and the example from Hellgren et al [21].…”

Section: Event-based Approachmentioning

confidence: 99%

Section: Rätanmentioning

confidence: 99%

Section: Finite Element Analysesmentioning

confidence: 99%

See 2 more Smart Citations

Estimating the Ice Loads on Concrete Dams Based on Their Structural Response

Hellgren

Enzell

Ansell

et al. 2022

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…This state will be broken when the temperature changes drastically. Especially in spring, when the ice cover absorbs more heat, its volume expands rapidly and will threaten the safety of hydraulic structures such as the earth dam slope, intake tower, and bridge pier [ 5 , 6 , 7 , 8 , 9 ]. Therefore, when designing hydraulic facilities, the ice load of the whole cycle in winter must be considered.…”

Section: Introductionmentioning

confidence: 99%

Static Ice Pressure Measuring System Based on Fiber Loop Ring-Down Spectroscopy and FPGA

Deng

Wang

Pan

et al. 2020

Sensors

View full text Add to dashboard Cite

Hydraulic engineering built in the cold region, such as reservoirs and hydropower stations, is often threatened by static ice pressure from nature. Therefore, it is of vital significance to research the pressure variation in the growth and melting processes of the ice layer for the design and protection of hydraulic structures in cold regions. This paper introduces an optical fiber sensor system based on the fiber loop ring-down spectroscopy technology and field-programmable gate array (FPGA) pulse modulation technology. An electro-optic modulation scheme that relied on FPGA to generate optical pulses with adjustable pulse width and period is proposed, which is more suitable for the in-situ observation. In addition, the temperature stability and repeatability of the system are also discussed. This system was applied to the real-time detection of static ice pressure on the sidewall and bottom of the polyvinyl chloride (PVC) pipe during the ice growth and melting processes. The results indicate that the system has favorable stability and sensitivity, and the relationship obtained between the static ice pressure and temperature could provide some references for the field application in the future.

show abstract