ANALYSIS ON DYNAMIC CHARACTERISTICS FOR A HIGH STRENGTH LIGHT-WEIGHT CONCRETE CONTINUOUS RIGID-FRAME BRIDGE
According to the structure and design characteristics of a high strength light-weight continuous rigid- frame bridge, dynamic model for it was established with FEM theory. Contributing ratio of mode shapes, natural frequencies and primary frequency of the bridge were calculated and analyzed with consideration of P-Δ and geometrical non-linearity effect. Conclusions are drawn as follows: (1) At deadweight direction, accumulative contributing ratio convergence speed of mode shapes is slower than that of the common concrete bridge. (2) Fundamental frequency is 13.4％ lower than that of the common concrete bridge, and natural frequencies descend on the whole. (3) The first mode shape is longitudinal excursion, which is the same as the common concrete bridge. It indicates that longitudinal stiffness of the bridge is smaller than that of other direction due to great influence of the flexible double thin-walled piers.
Mu-Yu Liu Li-Hua Zhang
Hubei key laboratory of roadway bridge and structure engineering, Wuhan University of Technology, Wuhan 430070, P.R. China
国际会议
长沙
英文
371-375
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）