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以杭州之江大桥为工程背景,利用ANSYS建立了施工及成塔状态的钢拱塔有限元模型,并计算了钢拱塔(考虑施工设备)的如下5个阶段的动力特性,包括:钢塔混凝土段完成、建至1/2、建至2/3、合龙前以及合龙后。计算结果表明:当钢拱塔从施工状态转变为成塔状态时,其基阶振型也由面内振动转变为面外振动,在这体系转换的过程中,钢拱塔容易发生风致振动,进而对其施工质量、设备及人员安全产生较大的影响。因此,需要采取适当的措施,以减轻施工和成塔状态钢拱塔的风致振动,而该研究的成果也可为钢拱塔的风致振动的控制研究提供科学的依据和参考。
Taking Hangzhou Zhijiang Bridge as the engineering background, the finite element model of steel arch for construction and tower formation was established by using ANSYS. The dynamic characteristics of the steel arch tower (considering the construction equipment) in the following five stages were calculated, including the steel tower Concrete section completed, built to 1/2, built to 2/3, before closing and after closing. The calculation results show that when the steel arch is changed from the construction state to the tower state, the fundamental mode shape changes from the in-plane vibration to the out-of-plane vibration. During the transition of the system, Which in turn has a great impact on the construction quality, equipment and personnel safety. Therefore, it is necessary to take appropriate measures to reduce the wind-induced vibration of the steel arch tower during construction and towering. The results of this research can also provide scientific basis and reference for the research on wind-induced vibration control of steel arch tower.