高扬程升船机不同壁厚塔柱结构的抗震性能分析

Seismic performance analysis of tower structures with different wall thicknesses for high-lift ship lift

基于200米级高扬程升船机固定壁厚塔柱结构形式,以混凝土用量一致为原则,拟定变壁厚塔柱结构形式。采用有限元软件ABAQUS,分别建立了固定壁厚和变壁厚两种塔柱结构模型,对塔柱结构的动力响应进行对比分析。结果表明:1)在自重荷载、风荷载和8度地震作用下,固定壁厚塔柱结构和变壁厚塔柱结构的顶部最大位移分别为38.5、34.7 cm,均满足规范限值。2)3条地震波作用下,两种塔柱结构的顶部加速度比底部加速度都大,呈现加速度放大效应,放大2倍左右。3)筏形基础与塔柱结构交界面出现了压应力集中,筏形基础左右、中间部分及筒体内部区域出现了拉应力集中。塔柱截面和挡土墙交界处易发生应力集中。4)变壁厚塔柱结构的顶部最大位移,筏形基础的最大拉、压应力,截面最大等效应力,均比固定壁厚要小较多。变壁厚塔柱结构形式更优。

Based on the fixed wall thickness tower structure form of 200 m high-lift ship lift,the variable wall thickness tower structure form is proposed based on the principle of consistent concrete consumption.Using the finite element software ABAQUS,two kinds of tower structure models,fixed wall thickness and variable wall thickness,are established respectively,and the dynamic response of tower structure is compared and analyzed.The results show:1)Under the action of self-weight load,wind load and 8 degree earthquake,the maximum displacement of the fixed wall thickness column structure and the variable wall thickness column structure are 38.5 cm and 34.7 cm,respectively,which meet the specification limit.2)Under the action of three seismic waves,the top acceleration of the two columns are larger than the bottom acceleration,showing an acceleration amplification effect.They are amplified by 2 times approximately.3)The compressive stress concentration occurs at the interface between the raft foundation and the tower column structure,and the tensile stress concentration occurs in the left and right sides of the raft foundation,and in the middle part and the inner part of the cylinder.Stress concentration is likely to occur at the ining wall.4)The maximum displacement at the top of the variable wall thickness column structure,the maximum tensile and compressive stress of the raft foundation and the maximum equivalent stress of the section are much smaller than the fixed wall thickness.Therefore,the structure of the wall thickness column is better.