【作者】 蒋凯；

【导师】 何良德；

【作者基本信息】 河海大学 ， 港口、海岸及近海工程， 2007， 硕士

【摘要】 向家坝垂直升船机提升重量为5700t，在国内仅次于三峡；提升高度114.2m，居世界之首。升船机的承载主体结构为塔柱结构，是升船机中最重要、最复杂的结构。单个塔柱长54.0m，宽14.35m，壁厚1.00m，高150.0m。 该塔柱结构高度大，地震危害大，建筑物的抗震分析是安全评价的重要内容。在国内对大型塔柱的研究较少。本文运用简化模型进行谱分析和时程分析，粗略估算升船机塔柱的动力响应。并建立有限元模型进行静力、标准谱分析和时程分析，对该塔柱的静力特性、动力响应和抗震特性进行了研究。 通过分析比较后我们可得到以下的结论： (1)在水平风荷载或地震荷载作用下，结构在横河方向的位移要大于顺河方向，因为结构的横河向刚度小于顺河向，变形以横河向为主。 (2)将塔柱简化为两种“糖葫芦”串类型的有限自由度刚架体系计算，标准谱分析最大位移为14.2cm；最大位移差为1.62cm；最大压应力为15.14Mpa；最大拉应力为2.05Mpa；时程分析最大位移为14.75cm；最大位移差为2.23cm；最大压应力为13.35Mpa；最大拉应力为2.99Mpa；此方法可粗略估算结构的动力响应，方法简单、可行。所得结果可作为有限元计算的参考。 (3)有限元静力分析结论：塔柱顶部位移最大，为12.4cm；塔柱间最大位移差为4cm。但塔柱的危险部位在高程292.5m截面刚度突变处以及塔柱根部与底板相接处。 (4)有限元标准谱分析结论：各种振型周期相差较大，可以不考虑各振型间的扭转耦合。基本振型为横河向振型，两塔柱运动基本同步。静动叠加最大位移为28.7cm；最大位移差为6cm；最大压应力为13.2Mpa；最大拉应力2.47Mpa。 (5)对塔柱进行时程分析以补充反应谱计算的不足是十分有必要的，实测地震波的响应比标准谱作用的响应要大。最大位移为51cm；最大位移差为7cm；最大压应力为18Mpa；最大拉应力为3.24Mpa。 (6)该结构的有限元标准谱分析和时程分析结果相近。简化结构分析结果与有限元计算结果相近，可作为前期研究的估算。结构的应力及位移满足规范要求。更多还原

【Abstract】 The lifting weight of Xiangjiaba vertical ship lift is 5700t, which is next only to Three Gorges Project. The lifting height is at top of the world--114.2m. The tower column, which is the main bearing structure of the ship life, is the most important and complicated structure of the ship lift. The tower column is 150m high and its wall thickness is 1.00m.Seismic analysis is very important to the safety evaluation of this tower column for its huge height. The research on the mega-high tower column is lack in our country. The seismic calculation of the tower column is down through the spectrum analysis and the temporal analysis of the simplified model and the finite element model.The conclusions are presented as follows:(1)Under the loads of wind and earthquake, the displacement along the river is larger than that across the river. It gives priority to the deformation across the river for the rigidity of the structure along the river is larger than that across the river.(2)The tower column is simplified as two types of string of candied haws model to calculate. Through the spectrum analysis, the maximum displacement is 14.2cm and the maximum stress is 2.05MPa. Through the temporal analysis, the maximum displacement is 14.75cm and the maximum stress is 2.99MPa. All the data can be used as reference.(3)The result of the static finite element calculation shows that the maximum displacement is 12.4m at the top of the tower column. But the dangerous point of the tower column happens at the altitude of 292.5m and the anastomosis of the soleplate and the bottom of the tower column.(4)The spectrum analysis shows that the periods of each- vibration type are diff erent and the torsion coupling can be ignored. The basic vibration type is the one along the river. The sum of the static and dynamic displacement is 28.7cm.(5)The temporal analysis is necessary. Compared to the spectrum analysis, the result of the temporal analysis is larger. The maximum displacement is 51cm and the maximum stress is 3.24MPa.(6)The result of the temporal analysis and that of the spectrum analysis are close while the result of the finite element calculation and that of the simplified structure calculation are close.更多还原