Abstract
Double-layer spatial domes are one of the most common spatial structures, the stability and progressive collapse of which are of great importance in design, construction and maintenance of such special structures. In this paper considering three loading cases and two types of support conditions, the collapse behaviour of double layer Diamatic dome has been investigated utilizing non-linear static analysis and alternate path method usage. In order to modelling compressive member behaviour, effective buckling modes have been obtained by eigenvalue buckling analysis for all of the members. Behaviour of compressive members has been obtained via definition of initial imperfection and non-linear static analysis. Riks arc-length method has been utilized for non-linear static analysis. The numerical results have indicated that reducing the number of the supports and focusing of load in a local area of the dome extremely impact on its vulnerability to failure, as in similar loading condition, decreasing the number of the supports reduces the capacity of damage resistance in spatial domes up to 50 percent. Investigating some models has shown that removing the critical members of the top layer has little effect on load-bearing capacity of the dome and it causes a slight failure in the structure. In this condition, structural redundancy can be considered equal to static indeterminacy. Load bearing capacity of the structure decreased up to 39 percent when compressive members of the web and bottom layers were removed. In this condition, the structure failure is considered moderate.
Highlights
One of the oldest impressive structural systems, domes which are formed from single or multi-layer bar elements, have geometrical curvature in longitudinal direction and ordinate
It was believed that multilayer spatial structures do not cause concern about progressive collapse due to multiplicity of members and the high degree of redundancy .as a result, most researches have been conducted on single-layer domes
Force absorption potential and pass from progressive collapse has been studied by presentation an evaluation factor called Residual redundant factor
Summary
One of the oldest impressive structural systems, domes which are formed from single or multi-layer bar elements, have geometrical curvature in longitudinal direction and ordinate. First serious investigation in this way and presenting the most prevalent use of progressive collapse potential evaluation method namely Load Alternate Path Method§, was conducted by Smith in 1988 for first time in evaluation of double layer grids While this method has been utilized for framed structures already [11]. Four substructure experiments were conducted for a single layer spatial grid structure to investigate the typical failure mechanisms [20] Based on their experimental results, a numerical simulation using multi-scale technology was calibrated. Ye and Qi (2017) [22] simulate the complicated mechanical behaviour that occur in the collapse process of structures, extended DEM to study the continuum structures Their proposed method is applied to the collapse simulation process of single-layer reticulated dome models. Compared with the shaking table test, it is observed that the simulation results including the collapse process and the fracture location of joints, agree well with the experimental phenomenon
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