1. Degree Program in Engineering Mechanics and Energy, University of Tsukuba, Tsukuba 305-8573, Japan
2. Division of Engineering Mechanics and Energy, University of Tsukuba, Tsukuba 305-8573, Japan
3. Department of Civil Engineering, National Institute of Technology Puducherry, Puducherry 609 609, India
4. Department of Civil Engineering, Birla Institute of Technology and Science, Pilani 333 031, India