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孫澄潮1， 劉剛君1， 劉正華2
(1 泛華建設(shè)集團(tuán)有限公司，北京100088；2 中華女子學(xué)院基建處，北京，100101)[摘要] 本文采用SlabCAD對變厚度板的內(nèi)力與變形進(jìn)行分析，提出了設(shè)計(jì)計(jì)算的具體要求，并得出以下結(jié)論：1)變厚度中空板是一種優(yōu)化的板型，內(nèi)力分布優(yōu)于平板，變形特征又與平板相似，因此厚板不同于扁梁，決定了變厚度板的設(shè)計(jì)計(jì)算特點(diǎn)；2）變厚度板的厚板配筋是由裂縫控制等級確定的；3）中空設(shè)計(jì)不僅能減輕樓板自重，從成空截面分析，還能降低配筋量；4）厚板的高度大，又布置在板的內(nèi)力較大處，適合于施加預(yù)應(yīng)力，板帶之間的預(yù)應(yīng)力效應(yīng)是相互影響的，文中給出了計(jì)算板帶預(yù)應(yīng)力的方程組；5）變厚度板具有較好的技術(shù)經(jīng)濟(jì)指標(biāo)，要設(shè)計(jì)好變厚度大板，厚板不要太厚，薄板不能太薄，變厚度比應(yīng)大于等于0.4。
[關(guān)鍵詞] 變厚度中空板；變厚度比；裂縫控制等級；成空設(shè)計(jì)；預(yù)應(yīng)力Design and Study of Prestressed Variable Thickness Hollow Slab
Sun Chengchao1, Liu Gangjun1, Liu zhenghua2
(1 Pan-China Construction Croup Co. , Ltd. , Beijing 100088, China; 2 Capital Construction Department of China Women's University, Beijing 100101, China)Abstract: The article has been analysised to the variable thickness slab which used by SlabCAD, the specific requirement has been proposed for the design of variable thickness slab. The conclusion as follows:l) The variable thickness hollow slab is a optimized plate type, the distribution of internal force is better than the plate, the character of deformation is similar with the plate, so the thick plate is different from the flat beam. It is determine to the character of variable thickness slab design. 2)The reinforce of variable thickness slab is determined by the degree of cracking contral. 3)The hollow design not only can lighten self-weight of the floor, but also can reduce the quantity of reinforcement by analysis of hollow section. 4) The thick strip has great height, and it has been layouted at the location of bigger internal force, it is fit for the applied prestressing force. The prestressing effect between strip has been influenced by each other, the regulation of calculating prestressing force in strips has been given in the article. 5)The variable thickness slab has good technico-economical index, The thick plate should not be too thick, if it want to well-design, the thin plate is also should net be too thin, the ratio of variable thickness should be bigger or equal t0 0.4.
Keywords: variable thickness hollow slab; ratio of variable thickness; degree of cracking control; hollow design; prestress
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