**Author details**

Khairullah Yusuf1,2 and Roszilah Hamid<sup>2</sup> \*

\*Address all correspondence to: roszilah@ukm.edu.my

1 Department of Civil Engineering, Faculty of Engineering, Malikussaleh University, Indonesia

2 Department of Civil and Structural Engineering, Universiti Kebangsaanm Malaysia, Malaysia
