1. Associate Professor, Dept. of Structural Mechanics, Budapest Univ. of Technology and Economics, Műegyetem rkp. 3, Budapest 1111, Hungary (corresponding author).
2. Engineering Faculty, Structural Engineering Group, Autonomous Univ. of Yucatán, Av. Industrias No-Contaminantes x Periférico Norte S/N, Cordemex, Mérida, Yucatán, CP97000, Mexico.