摘要
Abstract
The random finite element method(RFEM), which incorporates simulation techniques of random fields with the finite element method, is proposed to analyze theseismicresponse of rockfill dams. In order toconsider the spatial variability of dam materials, a Local Averaged Subdivision method is used to simulate the random physical and mechanical property fields. Moreover, to lower the cost of obtaining statistical informationof mechanical properties of materials, it is suggested to adopt constitutive equations which connect mechanical properties with physicalones. Then, the random seismic response and deformation of a real rockfill dam is simulated via RFEM, in which the drydensity, void ratio,median grain size, uniformity coefficient, initial internal friction angle and shear modulus coefficient of the rockfill materials are modelled as random fields. The simulated results show that: (1)The randomness of dam materials will induce unneglectable dispersion in theperformance of dams; (2)It is very likely that the response of dams will be underestimated if the randomness of dam materialsis overlooked;(3)Some dynamic performance indicators may follow neither the normal northe lognormal distribution.关键词
土石坝/地震反应/堆石料/空间变异性/随机有限元法Key words
rockfill dam/seismicresponse/rockfill material/spatial variability/random finite element method分类
建筑与水利
