Modification of Behavior of Double‐Layer Grids: Overview

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Abstract
Several studies in recent years suggest that conventional design of space trusses, based on elastic analysis, may lead to unsafe design. Space truss response is adversely affected by imperfections in the presence of brittle‐type compression member buckling coupled with high degree of static indeterminacy. This paper provides a critical review of enhancement techniques evolved in recent years that aim at improving space truss response in terms of ductility and loadbearing capacity. Underdesign of critical tension members coupled with overdesign of critical compression members, diagonal member removal or eccentric diagonals, and prestress by imposed lack of fit in members are effective techniques that are relatively simple to implement. A conservative approach to the design of compression members is generally recommended.

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