Introduced by prestressed pier in the gate of spillway in xiao xia hydroelectric power station , the text reasonably established 3 - d finite elements mechanic model by the advanced finite elements popular in the world which can expediently impose tension of anchor funicular at its place . it also considered possible diversified combination of loading , and indicated that the effect of its prestressed action is fruitful compared with its conventional counterpart by study of mechanic calculation in comparison . as a result , it vastly improved burdening state of pier . by analysis of 3 - d finite element method , it also gained the stress result indifferent boundary conditions such as breast wall joint support and fixed support , and the displacement result in diversified loading combination . those results gained the instructive and reference value in design of prestressed pier 本文結(jié)合黃河小峽水電站泄洪閘預(yù)應(yīng)力閘墩這一工程實踐,采用國際上已成熟的有限元方法,合理地建立了預(yù)應(yīng)力閘墩的三維有限元模型,該模型可方便地按預(yù)應(yīng)力錨索的點位施加錨索預(yù)張拉力,考慮了可能發(fā)生的多種荷載工況組合,并與無預(yù)應(yīng)力閘墩結(jié)構(gòu)進行了對比分析研究,指出其預(yù)應(yīng)力效果是明顯的,可以大大改善閘墩結(jié)構(gòu)的受力狀態(tài),通過三維有限元分析,還得到了胸墻簡支、固端不同情況下的應(yīng)力成果和各荷載下的位移成果,這些成果的取得對預(yù)應(yīng)力閘墩的設(shè)計具有一定的指導(dǎo)和參考價值。