Abstract
Practical designs of double-layer grids often fail to achieve full utilization of the structural efficiency inherent in this spatial framework. This ineffi-ciency is due partly to the tendency to use a small number of different cross-sections, and partly to the sensitivity of compression members with “brittle type” buckling characteristics to imperfections. Prestressing can enhance structural efficiency through recruitment of unutilized member capacity. The procedure also enables improvement of ductility through some controlled strength trade-off. Results of the experimental work presented in this paper indicated increased strength of 40% compared with the non-prestressed configuration as well as enhanced ductility in the peak load region. Larger enhancements are feasible in large grids.
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