大型双槽渡槽非线性地震响应分析

Non-linear Earthquake Response Analysis of Large-scale Double-channel Flume

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 double-channel thin-wall structure flume, non-linear earthquake response analysis is presented. The double-channel flume elastic-plastic dynamic model is combined with the flume thin-wall elastic model and non-linear multi-spring model. The non-linear hysteretic characteristics of the plastic hinge is simulated by using multi-spring equivalent relationship and the influences of section biaxial moment and the axial deformation are all taken into consideration. Taking Laozhangzhuang flume for an example, the elastic and plastic seismic response of double-channel flume is calculated. The calculation results show that the value of the elastic and the plastic is different. The plastic displacement is larger than the elastic one, and the plastic internal force is smaller than the elastic one. Therefore, it is necessary to calculate non-linear earthquake response of double-channel flume.