Effects of Predamaged Level on Confined HSC Columns Chau-Khun Ma, Sofrie Siew-Yung Chin, Nazirah Mohammad Apandi, Abdullah Zawawi Awang and Wahid Omar MATEC Web Conf., 103 (2017) 02007 Published online: 05 April 2017 DOI: 10.1051/matecconf/201710302007