Optimization Design Of Reticulated Dome To Improve Structural Sensitivity

Single-layer latticed domes belong to structure of imperfection sensitivity. The randomly appears various initial geometric imperfection affected the ultimate load carrying capacity of the structure to some degree. To improve structural sensitivity, this paper proposed a new optimum design method considering the requirement of constant stability that is through section optimization design of reticulated domes to make those values of ultimate load carrying capacity shrinks toward equality that were obtained by section optimization and considering many different stochastic initial geometric imperfections. First we add stability constraint into the process of optimization design and the global stability analysis are considering. Then we group the members of structure according to sensitive rate of ultimate bearing capacity to imperfections and sequence two-stage algorithm is adopted to improve the section optimization design. Using single-layer K6 reticulated dome with span of 60 meters and rise of 15 meters as an example, the computed results show that, compared to the structure that has not been optimized in terms of section, those values of ultimate load carrying capacity of optimized structure considering 28 stochastic initial geometric imperfections, whose average value is bigger and the standard deviation is smaller. So we've got a section optimization result to make the structure's ultimate load carrying capacity pretty robustness and less volatile. In other words, the sensibility of ultimate load carrying capacity to imperfection is decreased and the amount of steel is reduced.