关键词: 重力坝, 坝体开孔, 抗震性能, 非线性, ADINA

Abstract:

The practical seismic damages of gravity dams often occur on the middle and upper part of the dam body, where the dam hole-opening are arranged, so that the dam head with openings become a weak spot for anti-seismic of gravity dams. Taking a powerhouse dam section of a scheduling RCC gravity dam for instance, we establish a three dimensional analytical model that considers the dam-foundation-water interaction based on ADINA. In this way, the characteristics such as natural vibration characteristic, dam displacement, principal tensile stress and crack propagation of dams with or without openings, were researched under strong earthquake. The results show that dam hole-opening has more impacts on local stress rather than on integral rigidity. So in anti-seismic design of gravity dams, we should focus on the hole-opening and take measures such as arranging reinforcing bars and using high grade concrete.

Key words: gravity dam, dam opening, anti-seismic behavior, nonlinearity, ADINA