1. Assistant Professor with Aggregation, Dept. of Civil Engineering and Architecture, Univ. of Beira Interior, 6201-001 Covilhã, Portugal (corresponding author).
2. Civil Engineer, Dept. of Civil Engineering and Architecture, Univ. of Beira Interior, 6201-00 Covilhã, Portugal.
3. Civil/Structural Engineer, Dept. of Engineering Projects, Sanitation Company of Pernambuco, 51200-150, Recife, Brazil.
4. Associate Professor, Dept. of Civil Engineering, Federal Univ. of Pernambuco, 50740-530, Recife, Brazil.