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为了研究双槽渡槽薄壁结构弹塑性动力特性,建立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,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,以老张庄渡槽为例,开展地震荷载作用下双槽渡槽线弹性和非线性地震响应计算。经结构线弹性和非线性地震响应比较,结果显示两者存在差异,即位移反应弹塑性解均大于线弹性解,内力反应弹塑性解均小于线弹性解。这说明开展大型双槽渡槽结构非线性地震响应分析很有必要。
In order to study the elastic-plastic dynamic characteristics of thin-walled aqueduct, the elastic-plastic dynamic analysis model of aqueduct thin-walled structure is established. The model integrates the linear elastic model and non-linear multi-spring model of aqueduct, The nonlinear hysteretic behavior of the plastic hinge zone is simulated. Taking the Lazhuangzhuang Aqueduct as an example, the elastic and nonlinear seismic responses of the double-groove aqueduct under seismic load are calculated. The comparison between the structural linear elastic and nonlinear seismic responses shows that there is a difference between them. That is, the elasto-plastic solutions of displacement response are larger than linear elastic solutions, and the elastic-plastic solutions of internal forces are less than that of linear elastic solutions. This shows that it is necessary to carry out nonlinear seismic response analysis of large double-tank aqueduct.