1. a Department of Civil Engineering, Bapatla Engineering College, Bapatla, Andhra Pradesh 522102, India
2. b Department of Civil Engineering, A. U. College of Engineering(A), Andhra University, Visakhapatnam, Andhra Pradesh 530003, India
3. c Department of Civil Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382355, India