1. Department of Architecture and Architectural Engineering; Kyoto University; Katsura, Nishikyo Kyoto 615-8540 Japan
2. Architectural Design Division; Kajima Corporation; Motoakasaka, Minato Tokyo 107-8388 Japan
3. Department of Civil and Environmental Engineering, College of Engineering; University of Nevada; Reno NV 89557 USA
4. Department of Architecture; Tokyo Denki University; Tokyo 120-8551 Japan
5. Department of Materials Science, Graduate School of Engineering; Tohoku University; Sendai 980-8579 Japan