Structural Optimization of RC Columns in a Multi-storeyed Building by Tree-Columns Subjected to Lateral LoadsG.C. Balaji, S.S. Vivek, P.A. Edwin Fernando, B. Karthikeyan, P. Jaishankar and V. RathinakumarE3S Web of Conf., 405 (2023) 03001DOI: https://doi.org/10.1051/e3sconf/202340503001