@article{Nagai_2006 author = {Gakuji Nagai and Takahiro Yamada}, title = {Three-Dimensional Finite Element Modeling for Concrete Materials Using Digital Image and Embedded Discontinuous Element}, journal = {International Journal for Multiscale Computational Engineering}, issn = {1543-1649}, year = {2006}, volume = {4}, number = {4}, pages = {461--474} }