Study on High-rise Steel Building Structure that Excels in Redundancy
Summary:
The collapse of the WTC towers may be taken to be
an alert that a local failure can trigger a progressive
collapse, and a landmark event that alerted the construction
engineers to the importance of preventing progressive
collapses of similar structures. Prevention of progressive
collapse requires development of design technologies for
frames that excel in redundancy.
The Japan Iron and Steel
Federation and the Japanese Society of Steel Construction
established June this year the committee on "Study
on Redundancy of High-Rise Steel Buildings". This
paper discusses the high-rise steel building structures
that excel in redundancy, and outlines the themes of this
research project and then investigates analytically the
resistance of the steel frames against heat induced by
fire and loss of columns by accident such as an explosion
and a impact of a crash considering structural parameters
which are axial load utilization ratio of columns and
structural type of frames, which are moment resistant
frame, braced frame by hysteretic dampers and frame by
hysteretic dampers and outrigger truss system. A non-linear
analysis is conducted to estimate redundancy of various
types of frames considering heat induced by fire and loss
of columns. Based on the findings of the analysis, this
paper advanced that steel frame structures using load-carrying
capacity joints can withstand large-scale fires and loss
of vertical load resistant members if the axial load utilization
ratio of columns is held under 0.25, for prevention of
progressive collapses.
Format:
Pages : 14
Size: 370 kb
Author : A. Wada, K. Ohi, H. Suzuki, I. Nishiyama,
T. Hasegawa, Y. Sakumoto, M. Fushimi, and H. Kamura
Download:Study on High-rise Steel Building Structure that Excels in Redundancy
|
