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    張  力          （北京市建筑設(shè)計(jì)研究院  100045）

[提要]  用力法進(jìn)行對稱型剪式樓梯的內(nèi)力分析，并與空間梁系、有限元法模型進(jìn)行了比較，證明將復(fù)雜的空間對稱型剪式懸挑樓梯簡化分解為正置和倒置的平面梯形剛架，采用力法求解內(nèi)力，方法簡便可靠，在此基礎(chǔ)上進(jìn)行了對稱剪式樓梯的配筋設(shè)計(jì)。為提高支承樓梯的水平對稱懸挑折梁的剛度，設(shè)計(jì)采用了后張預(yù)應(yīng)力技術(shù)。
[關(guān)鍵詞]  對稱型剪式樓梯  正置剛架  倒置剛架  力法

Space girder structure, finite element method and force method are applied to analyze symmetrical type scissors stairs. The comparison of the results calculated by the three methods shows that the complicated space symmetrical type scissors stairs can be inverted to a ladder rigid frame. Because the stairs are simply supported on horizontal symmetrical overhanging folded beam, post-tensioned prestressed force technology is used to solve the effect of displacement and deformation of the beam.
Keywords:  symmetrical type scissors stairs; upside rigid frame; inverted rigid frame; force method