向家坝升船机塔柱简化结构大震不倒研究

Study on non-collapse of simplified structure of Xiangjiaba ship lift tower under rare earthquake

鉴于齿轮齿条式升船机过坝速度快、运行安全可靠,已在我国的大型水利水电工程中得到广泛应用。但是齿轮齿条式升船机结构型式复杂,其抗震研究基础薄弱,现行抗震规范中均没有专门针对该结构抗震设计的条文,因此急需进行抗震研究。本文对地震设防烈度达8度的向家坝升船机塔柱结构,采用静力和动力弹塑性分析方法,研究了大型升船机塔柱结构的薄弱部位和可能的破坏模式,分析结果与该结构的振动台模型试验结果规律一致。研究结果进一步表明该升船机结构抗震设计合理,具有多道抗震防线,有较好抗超设计地震的能力。

The vertical gear-rack typed ship-lift has widely applied in large water conservancy and hydropower pro- jects in China, in view of its fast speed of passing dam and its safe and reliable operation. Because of its complex structure and lack of foundation of seismic research, the research on seismic theory and technique for vertical gear- rack typed ship-lift is urgently needed. Firstly, static and dynamic elasto-plastic analysis method are used to study the weak parts and possible failure modes of the ship lift tower, the comparison of test and analysis results shows the failure laws are equal between shake table test and elasto-plastic analysis. The analysis results further indicate that the structure are reasonable designed to have better seismic performances with multiple seismic fortification lines against exceeding design earthquake.