8 Seismic Risk Evaluation of an Office Building Considering of a Functional Stop of Building Equipments Shigeki SAKAI, Takashi KATO, Kazuaki MORI, Takashi INOUE 9 A Study on Stability Analysis of Castle Masonry Walls by Using the Distinct Element Method Hiroyoshi KASA, Kazuhiko NISHIDA, Tatsuaki NISHIGATA, Hiroyuki MORIMOTO, Yoshinori AWATANI, Hiroyuki YAMAMOTO 10 Study on Primary Treatment of Dam Sediment Replenishing to the River Tetsuya SUMI, Akira KUBOTA, Goro FUCHIGAMI, Isamu SANDANBATA, Ichiro YOSHIKOSHI, Shirou KODAKA