直埋蜗壳钢衬厚度减薄研究  

Study on thinning of thickness of spiral steel lining in embedded spiral case

作　　者：贺源[1] 孙德港 翟黎明[1] 王正伟[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室热能工程系,北京100084 [2]杭州力源发电设备有限公司,杭州311241

出　　处：《水力发电学报》2015年第3期157-163,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金资助项目(51279205)

摘　　要：本文对不同厚度钢衬下的直埋蜗壳结构进行了三维非线性有限元分析。结果表明:钢衬厚度减薄后,钢树自身等效应力、外围混凝土的拉应力及开裂范围并没有明显增大,即使在甩负荷工况下,减薄后的钢衬最大等效应力仍然远小于其屈服强度,其最大应力只有屈服强度的五分之一,钢衬的承载潜力并没有发挥出来,钢衬厚度可以适当减薄。此外,还对直埋蜗壳结构进行了超载分析,得到了外围混凝土裂纹的产生和发展过程。In this paper, a 3D nonlinear FEM is used to analyze an embedded spiral casing structure with different thicknesses of spiral steel lining. The results show that even if the thickness of steel spiral ease is reduced, its yon mises stress or the tensile stress and cracked area of its surrounding concrete does not increase significantly. Even in load rejection condition, after thinning the spiral steal lining, its maximum stress is still less than the yield strength, reaching only one-fitCh of the latter, far from its ultimate bearing capacity. This paper also analyzes the spiral structure under overloading and obtains a process of crack initiation and propagation in the surrounding concrete.

关 键 词：直埋蜗壳 非线性 厚度减薄 混凝土裂纹 

分 类 号：TV34[水利工程—水工结构工程]