【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210506
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How does the working principle of an arch dam differ from that of a gravity dam? Answer: (1) An arch dam is a thrust structure; under external loads, the arch section is primarily subjected to axial compressive stress with relatively small bending moments, which allows the compressive strength of the concrete or masonry materials used in the dam to be fully utilized. In contrast, a gravity dam is mainly subject to bending forces, preventing the full exploitation of the compressive strength of the materials. (2) Unlike gravity dams, which rely on their own weight to maintain stability, arch dams transfer most of the external loads to the rock masses on both sides through the arching effect; they depend mainly on the rock masses at the abutments on both sides for stability, and the weight of the dam structure itself has little impact on its stability. (3) Self-weight and uplift force become secondary loads, while temperature loads and foundation deformation will have a significant impact on the stresses in arch dams. We welcome active participation in discussions; the system offers generous rewards for answering questions from VIP members! ! !
1. What are the operational characteristics of arch dams compared to gravity dams? ○1 The combined action of arches and beams; ○2 Stability relies primarily on the reaction forces at the arch ends on both sides, hence high requirements are placed on the foundation
An arch dam is a water-retaining structure that has an arch shape protruding upward toward the upstream side; it utilizes the effect of the arch to transfer all or part of the water pressure to the bedrock on both sides of the river valley. Compared to gravity dams, the stability of the dam body under water pressure does not rely on its own weight for support; instead, it is primarily supported by the reaction force from the bedrock at the arch ends. The arch section mainly bears axial reaction forces, allowing for the full utilization of the strength of the dam-building materials. Therefore, it is a dam type with excellent economic and safety properties.
An arch dam is a water-retaining structure that has an arch shape protruding upward toward the upstream side; it utilizes the effect of the arch to transfer all or part of the water pressure to the bedrock on both sides of the river valley. Compared to gravity dams, the stability of the dam body under water pressure does not rely on its own weight for support; instead, it is primarily supported by the reaction force from the bedrock at the arch ends. The arch section mainly bears axial reaction forces, allowing for the full utilization of the strength of the dam-building materials. Therefore, it is a dam type with excellent economic and safety properties.
(1) An arch dam is a thrust structure; under external loads, the arch section mainly experiences axial compressive stress with relatively small bending moments, which allows the compressive strength of the concrete or masonry materials used in the dam to be fully utilized. In contrast, a gravity dam is primarily subjected to bending forces, preventing the full exploitation of the compressive strength of the materials. (2) Unlike gravity dams, which rely on their own weight to maintain stability, arch dams transfer most of the external loads to the rock masses on both sides through the arching effect; they depend primarily on the rock masses at the abutments on either side to maintain stability, with the self-weight of the dam body having little impact on its stability. (3) Self-weight and uplift pressure become secondary loads, while temperature loads and foundation deformation will have a significant impact on the stresses in arch dams.
1. An arch dam is a thrust structure; under external loads, as long as it is properly designed, the arch section primarily experiences axial compressive stress with relatively low bending moments, which facilitates the full utilization of the compressive strength of the concrete or masonry materials used in the dam. The greater the role of arching, the more fully the compressive strength of the material can be utilized, and the thinner the dam structure can be made. Gravity dams are primarily subjected to bending, preventing them from making full use of the compressive strength of the materials. 2. Unlike gravity dams, which rely on their own weight to maintain stability, arch dams transfer most of the external loads to the rock masses on both sides through the arching effect; they depend primarily on those rock masses for stability, and the weight of the dam structure itself has little impact on its stability. 3. Loads such as self-weight and uplift force become secondary, while temperature and foundation deformation will have a significant impact on the stresses in the arch.
An arch dam is a water-retaining structure that has an arch shape protruding upward toward the upstream side; it utilizes the effect of the arch to transfer all or part of the water pressure to the bedrock on both sides of the river valley. Compared to gravity dams, the stability of the dam body under water pressure does not rely on its own weight for support; instead, it is primarily supported by the reaction force from the bedrock at the arch ends. The arch section mainly bears axial reaction forces, allowing for the full utilization of the strength of the dam-building materials. Therefore, it is a dam type with excellent economic and safety properties.
An arch dam is a water-retaining structure that has an arch shape protruding upward toward the upstream side; it utilizes the effect of the arch to transfer all or part of the water pressure to the bedrock on both sides of the river valley. Compared to gravity dams, the stability of the dam body under water pressure does not rely on its own weight for support; instead, it is primarily supported by the reaction force from the bedrock at the arch ends. The arch section mainly bears axial reaction forces, allowing for the full utilization of the strength of the dam-building materials. Therefore, it is a dam type with excellent economic and safety properties.
A gravity dam is a large-scale water-retaining structure built from concrete or rubble masonry; its basic cross-section is that of a right triangle, and it consists of several dam sections as a whole.
1. An arch dam is a thrust structure; under external loads, the arch section is primarily subjected to axial compressive stress with relatively low bending moments, which allows the compressive strength of the concrete or masonry materials used in the dam to be fully utilized. In contrast, a gravity dam is mainly subject to bending forces, preventing the full exploitation of the compressive strength of the materials used； 2. Unlike gravity dams, which rely on their own weight to maintain stability, arch dams transfer most of the external loads to the rock masses on both sides through the arching effect; they depend primarily on the rock masses at the abutments on either side to maintain stability, with the weight of the dam structure itself having little impact on its stability ； 3. Self-weight and uplift pressure become secondary loads, while temperature loads and foundation deformation will have a significant impact on the stresses in arch dams.
(1) An arch dam is a thrust structure; under external loads, the arch section mainly experiences axial compressive stress with relatively small bending moments, which facilitates the full utilization of the compressive strength of the concrete or masonry materials used in the dam. In contrast, a gravity dam is a static structure that is primarily subjected to bending forces. (2) Unlike gravity dams, which rely on their own weight to maintain stability, arch dams transfer most of the external loads to the rock masses on both sides through the arching effect; they depend primarily on the rock masses at the abutments on either side to maintain stability, with the self-weight of the dam body having little impact on its stability. (3) Self-weight and uplift pressure become secondary loads, while temperature loads and foundation deformation will have a significant impact on the stresses in arch dams.