渡槽薄壁结构弹塑性动力分析模型及试验验证

本文提出了渡槽薄壁结构弹塑性动力分析模型，该模型集渡槽薄壁结构线弹性模型和非线性多弹簧模型为一体，并充分考虑了薄壁结构截面两向弯矩和轴向变形对单元的动力特性影响，应用多弹簧等效关系模拟结构塑性铰区的非线性滞回特性。通过预应力钢筋混凝土渡槽槽身以及高强混凝土渡槽支架模型的低周反复荷载拟静力试验，研究了渡槽槽身以及支架的非线性荷载-位移滞回特性。应用本文提出的弹塑性动力分析模型对拟静力试验过程中的荷载-位移滞回曲线进行了数值模拟计算。计算结果表明，模拟数值解与模型试验所得滞回曲线符合良好，从而验证了本文渡槽薄壁结构弹塑性动力分析模型的正确性。

Viscoelastic dynamic model for analysis of thin wall concrete aqueduct and experimental verification

A model combining the linear elastic model with nonlinear multi-spring model for analyzing the dynamic characteristics of thin wall concrete aqueduct is proposed. In the model the nonlinear hysterisis characteristic of the plastic hinge is simulated by using the multi-spring equivalent relationship and the influences of the biaxial moment in the cross section of the structure and axial deformation are considered. The hysterisis characteristics of the relationship between deformation and loading of aqueducts and brackets under the action of low frequency cyclic pseudo static loading are studied by model tests. The experimental results well accord with the calculation results by applying the proposed model.