Study of Structural Redundancy of High-Rise Steel Building Due to the Effect of Heat and Loss of Vertical Structural Members文档.pdf

of Vertical Structural Members by 1 2 3 4 4 Akira Wada , Kenichi Ohi , Hiroyuki Suzuki , Yoshifumi Sakumoto , Mitsumasa Fushimi , 5 6 7 8 Hisaya Kamura , Yukio Murakami , Masamichi Sasaki , and Kazunari Fujiwara ABSTRACT than 0.25. Therefore, for the prevention of progressive The collapse of the WTC towers may be taken as a collapse, the axial forces in vertical load-bearing warning that a local failure can trigger progressive members must be held below this limit. collapse. It is also a reminder to structural engineers that they need to gain a better understanding of this structural KEYWORDS: collapse temperature, high-rise steel phenomenon in order to prevent similar incidents in building, structural redundancy, progressive collapse future. The Japanese Iron and Steel Federation together with the Japanese Society of Steel Construction 1. INTRODUCTION established “The Committee on the Study on Structural The direct causes of the collapse of the World Trade Redundancy of High-Rise Steel Buildings” in June 2002 Center (WTC) Towers on September 11, 2001 were in an attempt to study and provide a better understanding damage to the columns caused by the impact of the two of progressive collapse. This paper discusses the j et