In order to study the prestress distribution characteristics of suspend-dome structure,a scale model was designed according to the scale of 1∶20 based on the suspend-dome roof of Lanzhou Olympic Sports Complex.The model was divided into three levels for prestress construction tension test.The internal force of the members and the vertical displacement of the nodes of the model under two different tension sequences were tested.The test results were compared with the MIDAS Gen numerical simulation results.The research shows that:for the ribbed ring type small rise-span ratio suspend-dome structure,the mutual influence of the ring cable is large during tension,and the internal force of the ring cable changes more obviously at the initial stage of tension.During the tensioning process,the influence of prestress on the ring bar is greater than that of the diameter bar.The outermost ring bar has the largest bearing ratio during the tensioning process,and the vertical displacement of the node reaches the maximum on the fourth ring.Different tensioning sequences will change the trend of internal force and node displacement of outer ring bars,and it is more beneficial to the structure to tension the lower cable from outside to inside by graded cycle.
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