(1)
Department of Civil & Environmental Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Kampus UGM, Yogyakarta 55281, Indonesia ,
(2)
Former Graduate Student, Department of Civil Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Kampus UGM, Yogyakarta 55281, , Indonesia