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因浮桥接头动力响应的复杂性,至今仍未找到一种通用的方法模拟接头的动力特性,使得对浮桥进行建模并求解其的动态响应时存在较大困难。利用杆单元模拟接头的抗拉和抗压特性,并利用梁单元的抗弯特性,把两者结合组成非线性混合单元,可以较好地模拟接头的特性和求解浮桥的动态响应。对数值计算和已有的模型试验结果的分析发现,在快速通载时非线性连接浮桥会发生位移波堆积效应。
Due to the complexity of the dynamic response of the pontoon connector, a general method has not been found to simulate the dynamic characteristics of the connector, which makes it difficult to model the pontoon and solve the dynamic response. The rod unit is used to simulate the tensile and compressive properties of the joint, and the flexural characteristics of the beam element are combined to form a nonlinear mixing unit, which can well simulate the characteristics of the joint and solve the dynamic response of the pontoon. The numerical calculation and the analysis of the existing model test results show that the displacement wave accumulation effect occurs in the non-linear connection of pontoon during rapid loading.