三峡电站直埋式蜗壳结构试验模型的非线性有限元分析

 三峡水电站蜗壳为钢衬钢筋混凝土结构，钢蜗壳直径大，内水压力高，外围混凝土相对较薄，为研究三峡电站采用直埋式蜗壳的可行性，开展 了结构模型试验和非线性计算分析工作。采用三维非线性有限元法对三峡水电站直埋式蜗壳 结构试验模型进行混凝土开裂计算，计算中混凝土裂缝模型采用分布裂缝模型，并考虑混凝 土的拉伸软化，钢筋采用分离式模型并用埋入方法将其嵌入混凝土单元。并对裂缝分布、钢筋应力、结构位移等计算与试验成果进行了对比分析，结果表明计算结果与模型试验结果基 本一致。为模型试验提供了依据及指导，并验证了非线性计算方法的合理性。

Three-dimensional Nonlinear Finite-Element Analysis on Directly Embedded Spiral Case Model of TGP Hydroelectric Power Plant

The spiral case of TGP hydroelectric power plant is a steel-plate lined reinforced concrete structure, with big diameter, high internal water pressure, and thinly pevipheral concrete. To investigate the feasibility of spiral case embedded directly, both the structure model experiment and nonlinear analysis have been carried out. To guide the model experiment and validate the rationality of nonlinear computing method, the three-dimensional nonlinear finite-element analysis is conducted to compute the concrete cracking in physical model. In the analysis, distributed cracking model is used, tension softening of concrete is considered and discretely reinforced bars are embedded in concrete elements. The computed results accord with model experimental data.