Factors influencing hysteresis characteristics of concrete dam deformation
(چکیده مقاله) :
Abstract :
Thermal deformation of a concrete dam changes periodically, and its variation lags behind the air temperature variation. The lag, known as
the hysteresis time, is generally attributed to the low velocity of heat conduction in concrete, but this explanation is not entirely sufficient. In this
paper, analytical solutions of displacement hysteresis time for a cantilever beam and an arch ring are derived. The influence of different factors
on the displacement hysteresis time was examined. A finite element model was used to verify the reliability of the theoretical analytical solutions. The following conclusions are reached: (1) the hysteresis time of the mean temperature is longer than that of the linearly distributed
temperature difference; (2) the dam type has a large impact on the displacement hysteresis time, and the hysteresis time of the horizontal
displacement of an arch dam is longer than that of a gravity dam; (3) the reservoir water temperature variation lags behind of the air temperature
variation, which intensifies the differences in the horizontal displacement hysteresis time between the gravity dam and the arch dam; (4) with a
decrease in elevation, the horizontal displacement hysteresis time of a gravity dam tends to increase, whereas the horizontal displacement
hysteresis time of an arch dam is likely to increase initially, and then decrease; and (5) along the width of the dam, the horizontal displacement
hysteresis time of a gravity dam decreases as a whole, while the horizontal displacement hysteresis time of an arch dam is shorter near the center
and longer
the hysteresis time, is generally attributed to the low velocity of heat conduction in concrete, but this explanation is not entirely sufficient. In this
paper, analytical solutions of displacement hysteresis time for a cantilever beam and an arch ring are derived. The influence of different factors
on the displacement hysteresis time was examined. A finite element model was used to verify the reliability of the theoretical analytical solutions. The following conclusions are reached: (1) the hysteresis time of the mean temperature is longer than that of the linearly distributed
temperature difference; (2) the dam type has a large impact on the displacement hysteresis time, and the hysteresis time of the horizontal
displacement of an arch dam is longer than that of a gravity dam; (3) the reservoir water temperature variation lags behind of the air temperature
variation, which intensifies the differences in the horizontal displacement hysteresis time between the gravity dam and the arch dam; (4) with a
decrease in elevation, the horizontal displacement hysteresis time of a gravity dam tends to increase, whereas the horizontal displacement
hysteresis time of an arch dam is likely to increase initially, and then decrease; and (5) along the width of the dam, the horizontal displacement
hysteresis time of a gravity dam decreases as a whole, while the horizontal displacement hysteresis time of an arch dam is shorter near the center
and longer
(توضیحات تکمیلی) :
(توضیحات تکمیلی) :
Description :
مقاله ISI انگلیسی اصلی
سال انتشار:2017
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تعداد صفحات فایل ISI انگلیسی اصلی: 9 صفحه
سال انتشار:2017
فایل ISI انگلیسی اصلی ، با فرمت Pdf
تعداد صفحات فایل ISI انگلیسی اصلی: 9 صفحه
Authors / Descriptions(نویسندگان/توضیحات): مقاله ISI سال انتشار2017 \ Jia-he Zhang a , Jian Wang a, *, Li-sha Chai b
Sent date(تاریخ ارسال) :
1397/10/18 | 1/8/2019
Number of visits(تعداد بازدید):
399
Key words (کلمات کلیدی):
Concrete dam; Displacement; Hysteresis; Temperature; Analytical solution
Number of pages(تعداد صفحات) :
9
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