Abstract
Progressive collapse of space structures has received much attention in recent years due to the recent failure of a double-layer space truss (DLST) stadium in Terengganu, Malaysia which collapse twice in Year 2009 and 2013. There is a considerable interest in understanding the collapse behaviour of space structures and possibility of improving its collapse behaviour. This phenomenon was demonstrated by earlier researchers, such as Collins (1981) and Parke (1988) which investigated the collapse behaviour both theoretically and experimentally. In their study a carefully designed DLST structure may possess reserve of strength in excess of their elastic capacity. Although DLST have a high degree of statically degree of statically indeterminacy, not all of them are robust, as it has been found a loss of one critical member could trigger the collapse of the entire structure. Usually the collapse of the DLST is influenced by the ductility behaviour of the compression members. The aim of this study was to investigate the use of novel soft member to reduce the catastrophic progressive collapse behaviour of DLSTs. A novel soft member was constructed to measure its behaviour under tensile and compressive loads. The term novel soft member used in this study is referred to a combination of three circular tubes which is made into one component and is used to support compressive load. It was found that using a blend of three circular tubes significantly increase the ductility behaviour of the member. These test illustrates that while the inner and outer tube experience compressive forces, the middle tube will continue to increase linearly. This indicates that there is a possibility of improving the collapse behaviour of DLST by incorporating the novel soft member.
Highlights
Progressive collapse analysis has been extensively studied and is attracting widespread interest for engineers and researchers all over the world
This paper presents a series of compression test to examine the relationships between load and displacement of space truss member with and without incorporating novel soft members
We demonstrate that buckling of a novel soft member under concentrated load may not lead to the collapse of the entire structure, will give greater warning before failure and their application may be applied in design and construction on double-layer space truss (DLST)
Summary
Progressive collapse analysis has been extensively studied and is attracting widespread interest for engineers and researchers all over the world. The termology of progressive collapse is defined as ‘the spread of an initial local failure from element to element eventually resulting in the collapse of an entire structure or a disproportionately large part of it [1]. The triggering event to the study of progressive collapse is the collapse of Hartford Civic Center Coliseum Roof that occurred in 1978. The study of collapse has become salient in the field of engineering. Past tragic incidents of the collapse of space structures, have given very valuable lessons to designers. By understanding what had caused such failures, this may avoid any reoccurrence and help to develop safer alternatives
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