1. School of Mechanical and Building Sciences, VIT Univ., Chennai, Tamil Nadu, IN 600127 (Corresponding author), e-mail: senthilkumark13@yahoo.com
2. Dept. of Civil Engineering, CARE School of Engineering, Tiruchirappalli 620009, Tamil Nadu, IN, e-mail: pvpremalatha@yahoo.co.in
3. Dept. of Civil Engineering, National Inst. of Technology, Tiruchirappalli 620015, Tamil Nadu, IN, e-mail: kbaskar@nitt.edu