applied sciences Article Thin-Walled CFST Columns for Enhancing Seismic Collapse Performance of High-Rise Steel Frames Yongtao Bai 1, Jiantao Wang 1, Yashuang Liu 2 and Xuchuan Lin 3,* 1 Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China; baiyongtao@xjtu.edu.cn...