Research on Steel Liner Thinning of Spiral Case Structure of a Large Hydropower Station
Traditionally, spiral case structure is classified as non-member bar reinforced concrete structure. It is improper to calculate reinforcement area according to the area of tensile stress figure, which often causes a lot of waste of reinforcement; it is particularly true for the spiral case structure with steel liner. In combination with the practice of a spiral case of the hydropower station, the different schemes are proposed by 3-D nonlinear FEM software ABAQUS to study the feasibility of thinning liner in this paper. It is indicated that magnitude of steel liner and the hoop stress of reinforcement is of no obviously increase, damaged region of concrete is of no significant variation and the cracking range of peripheral concrete is of the requirements when the rate of steel liner thinning is tiny. When the thinning rate is 10％, there is a significant increase in crack width, but it still meets the regulations. Although the magnitude of the stresses isnt beyond the strength requirement, the maximum crack width of concrete is over the designed standards when the rate is up to 30％. In this case, the crack width is controlled by collocating the more reinforcement in local positions. It is concluded that steel liner thinning is reasonable and feasible; whats more, the magnitude of thinning is very large when the more reinforcement are collocated without prejudice to the premise of the construction. It can provide references for steel liner optimization of the similar projects.
spiral case structure steel liner thinning 3D finite element cracking width
HailinWu Shihe Qin Xiaodong Wang Yuanxiong Tong
College of Hydraulic & Environmental Engineering of Three Gorges University Yichang, China Chengdu Hydropower Investigation Design & Research Institute of CHECC
国际会议
太原
英文
153-156
2011-02-26（万方平台首次上网日期，不代表论文的发表时间）