基于损伤理论的金属蜗壳埋设方式比较  被引量:5

Comparison of embedding types used in sheet-metal spiral case using damage theory

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作  者:张启灵[1] 伍鹤皋[1] 蒋逵超[1] 

机构地区:[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出  处:《华中科技大学学报(自然科学版)》2008年第6期122-124,132,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基  金:教育部优秀青年教师资助计划资助项目(20011879)

摘  要:为研究不同埋设方式蜗壳结构的受力特点,明确它们在大型水电站厂房中的应用可行性,选取ABAQUS中的损伤塑性模型描绘混凝土材料的力学性能.结合某工程实例,对垫层蜗壳和直埋蜗壳进行了三维非线性有限元计算,重点从蜗壳外围混凝土裂缝的开展宽度和范围及机墩结构的不均匀上抬位移两方面,对两种埋设方式蜗壳结构进行了比较.计算结果表明:两种埋设方式蜗壳都可以满足结构强度要求,但从限裂和变形两方面讲,垫层蜗壳略优于直埋蜗壳.In order to study the stressing characteristic of spiral case structure with different embedding types and to ascertain the application feasibility in large-scale hydropower station powerhouse, the spiral case embedded with cushion layer and the complete bearing spiral case were analyzed using three-dimensional nonlinear finite element method (FEM) from an actual project. The damaged plasticity model in ABAQUS was used to define the mechanical property of concrete in finite element calculation. The concrete crack propagation width and range around spiral case and the nonuniform rise of generator pedestal structure are mainly focused in the comparing research. It is concluded that the two embedding types of spiral case can both meet the strength requirement of structure. However, the spiral case embedded with cushion layer has a little advantage over that without cushion layer from the two aspects mentioned before.

关 键 词:水电站 损伤理论 垫层蜗壳 直埋蜗壳 非线性有限元方法 

分 类 号:TV31[水利工程—水工结构工程] TV731

 

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