First carry on the self libration analysis to the bridge, use spatial four nodes elastic shell element SHELL63 and spatial two nodes elastic beam element BEAM44 to model the bridge.
首先对大桥进行自振特性分析，分别采用空间四节点弹性壳单元SHELL63和空间二节点弹性梁单元BEAM 44单元进行建模。
Varying regularity of libration period on overweighted compound pendulum was obtained by theoretical reasoning? Research and analysis.
通过理论推导、研究和分析，得出了加配重复摆振动周期的变化规律。
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