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以洗耳河渡槽为例,以弹塑性梁单元模拟排架,采用有限体积法、ALE及二阶迎风格式模拟槽内水体,建立了二维槽—水耦合体,分析了横向地震作用下的排架损伤下渡槽动力非线性响应,并与线弹性梁单元模拟排架的分析结果进行对比。结果表明,在所选地震波横向作用下,排架发生损伤造成了刚度下降、结构振动周期延长,从而逼近水体的一阶晃动周期,引起了槽—水耦合体内水体的大幅晃动;排架损伤后槽底水平位移增大而水平加速度减小,槽内水体作用于槽体底部的动水压力、倾覆力矩、倾覆力减小。
Taking the Heerhe Aqueduct as an example, a two - dimensional trough - water coupling body was simulated by finite volume method, ALE and second - order upwind wind tunnel modeling with the elastic and plastic beam elements. The effects of transverse earthquake The nonlinear response of the aqueduct under the damage of the brackets is compared with the analysis results of the linear braced beam. The results show that under the transverse action of the selected seismic wave, the rigidity of the bracing frame decreases and the vibration period of the structure increases, which leads to the first-order wobble period of the water body, causing the rocking of the water body in the trough-water coupling. The horizontal displacement at the bottom of the tank increases and the horizontal acceleration decreases. The hydrodynamic pressure, overturning moment and overturning force acting on the bottom of tank body are reduced.