Analysis And Application For Stability Against Buckling Of High And Thin Arch Dam Based On Arch-cantilever Trial Method

The west-China Development and Strategic carry forward the economy, with the rapidconstruction industry of water conservancy and hydropower’s development in the southwestand northwest china, there will a group of high dam is being built in the mountains or canyons,of which there are many scientific issues need to be explored. With the use of high strengthconcrete and continuous progress of optimization design technology, the thickness of archdam is so thin that part of the site is close to the shell structure, the problem of bucklingstability of arch dam has gradually attracted everyone’s attention. The current standards do notcover more than200m range of arch dam, rarely involves the study of buckling of thin shellon evaluate the safety of arch dam, considering the influence of dam arch on curvature and theshear deformation in buckling stability calculation; lack of buckling instability in the designoptimization, in this paper present the following three parts:(1)Because of thickness and arc length are large at the lower&mid dam, which belongsto large curvature, considering the size effect on the critical load case, the third chapter willconsider the large curvature arch in the hinged and fixed support horizontal circle arch ringsunder uniform pressure, critical load is about the nonlinear function of thickness and arclength.(2)In this paper, the finite element results based on arch-cantilever method, defined thesafety coefficient of horizontal arch as the evaluation index of stability for the horizontal archring, the critical loads divided by the horizontal arch ring calculating by arch-cantilevermethod, the ratio is safety coefficient of horizontal arch, improved critical loads of arch ringwhich considering the effect of shear deformation and curvature, five engineering examplesshow that, compared with the cracking possible position and the actual destruction position,the results showed that the trend is consistent. So safety factor as the evaluation index toassess the arch buckling stability is practical significance, and in the end of the chapter thestatistics showed the critical slenderness coefficient.(3)With the development and application of high strength concrete in arch dam, which bebuilt in mountain valleys, optimization design is trend to reduce thickness, rarely focus onthe buckling stability of arch dam, considering the establishment of high and thin arch dam structure optimization model, this paper add resistance to buckling stability conditions for theoptimization calculation, compared with the original optimization scheme, the bucklingstability factor as a control condition is more reasonable.