In this study,the air blast response of the concrete dams including dam-reservoir interaction and acoustic cavitation in the reservoir is investigated.The finite element (FE)developed code are used to build three-dime...In this study,the air blast response of the concrete dams including dam-reservoir interaction and acoustic cavitation in the reservoir is investigated.The finite element (FE)developed code are used to build three-dimensional (3D)finite element models of concrete dams.A fully coupled Euler-Lagrange formulation has been adopted herein.A previous developed model including the strain rate effects is employed to model the concrete material behavior subjected to blast loading.In addition,a one-fluid cavitating model is employed for the simulation of acoustic cavitation in the fluid domain.A parametric study is conducted to evaluate the effects of the air blast loading on the response of concrete dam systems.Hence,the analyses are performed for different heights of dam and different values of the charge distance from the charge center.Numerical results revealed that 1)concrete arch dams are more vulnerable to air blast loading than concrete gravity dams;2)reservoir has mitigation effect on the response of concrete dams;3)acoustic cavitation intensify crest displacement of concrete dams.展开更多
The purpose of the present study was to develop a fuzzy finite element method,for uncertainty quantification of saturated soil properties on dynamic response of porous media,and also to discrete the coupled dynamic eq...The purpose of the present study was to develop a fuzzy finite element method,for uncertainty quantification of saturated soil properties on dynamic response of porous media,and also to discrete the coupled dynamic equations known as u-p hydro-mechanical equations.Input parameters included fuzzy numbers of Poisson's ratio,Young's modulus,and permeability coefficient as uncertain material of soil properties.Triangular membership functions were applied to obtain the intervals of input parameters in five membership grades,followed up by a minute examination of the effects of input parameters uncertainty on dynamic behavior of porous media.Calculations were for the optimized combinations of upper and lower bounds of input parameters to reveal soil response including displacement and pore water pressure via fuzzy numbers.Fuzzy analysis procedure was verified,and several numerical examples were analyzed by the developed method,including a dynamic analysis of elastic soil column and elastic foundation under ramp loading.Results indicated that the range of calculated displacements and pore pressure were dependent upon the number of fuzzy parameters and uncertainty of parameters within equations.Moreover,it was revealed that for the input variations looser sands were more sensitive than dense ones.展开更多
文摘In this study,the air blast response of the concrete dams including dam-reservoir interaction and acoustic cavitation in the reservoir is investigated.The finite element (FE)developed code are used to build three-dimensional (3D)finite element models of concrete dams.A fully coupled Euler-Lagrange formulation has been adopted herein.A previous developed model including the strain rate effects is employed to model the concrete material behavior subjected to blast loading.In addition,a one-fluid cavitating model is employed for the simulation of acoustic cavitation in the fluid domain.A parametric study is conducted to evaluate the effects of the air blast loading on the response of concrete dam systems.Hence,the analyses are performed for different heights of dam and different values of the charge distance from the charge center.Numerical results revealed that 1)concrete arch dams are more vulnerable to air blast loading than concrete gravity dams;2)reservoir has mitigation effect on the response of concrete dams;3)acoustic cavitation intensify crest displacement of concrete dams.
文摘The purpose of the present study was to develop a fuzzy finite element method,for uncertainty quantification of saturated soil properties on dynamic response of porous media,and also to discrete the coupled dynamic equations known as u-p hydro-mechanical equations.Input parameters included fuzzy numbers of Poisson's ratio,Young's modulus,and permeability coefficient as uncertain material of soil properties.Triangular membership functions were applied to obtain the intervals of input parameters in five membership grades,followed up by a minute examination of the effects of input parameters uncertainty on dynamic behavior of porous media.Calculations were for the optimized combinations of upper and lower bounds of input parameters to reveal soil response including displacement and pore water pressure via fuzzy numbers.Fuzzy analysis procedure was verified,and several numerical examples were analyzed by the developed method,including a dynamic analysis of elastic soil column and elastic foundation under ramp loading.Results indicated that the range of calculated displacements and pore pressure were dependent upon the number of fuzzy parameters and uncertainty of parameters within equations.Moreover,it was revealed that for the input variations looser sands were more sensitive than dense ones.
