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    黃坤耀  樓文娟  孫炳楠    （浙江大學(xué)土木系  杭州 310027） 

    郭萬(wàn)萍    （杭州市建筑設(shè)計(jì)院 310001）

[提要]  結(jié)合一實(shí)際工程，建立了較精確的有限元模型，對(duì)有粘結(jié)預(yù)應(yīng)力梁板柱體系進(jìn)行空間分析，得出了結(jié)構(gòu)的應(yīng)力分布，并與現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果進(jìn)行了比較，兩者吻合較好。按靜力等效原理著重討論了預(yù)應(yīng)力梁支座截面和跨中截面有效翼緣寬度的合理取值，結(jié)果表明，預(yù)應(yīng)力梁的有效翼緣寬度與結(jié)構(gòu)受力的類型密切相關(guān)，在預(yù)應(yīng)力等效軸向力作用下比等效橫向力和等效集中彎矩作用下梁有效翼緣寬度人許多。另外還值得注意的是，在預(yù)應(yīng)力等效荷載作用下，采用等代空間框架法分析將無(wú)法反映跨中截面板面的拉應(yīng)力峰值。
[關(guān)鍵詞]  有限元法  空間分析  有效翼緣寬度  預(yù)應(yīng)力梁板體系

Bascd on an cnginccring projcct,the finite clcmcnt mcthod is applicd to the bondcd-prcstrcsscd bcam-platc-column systcm. The strcss distribution is achicvcd, which is closcd to the rcsult from the tcst. According to the static cquivalcnce disciplinc, cmphasis is on cvaluating the cffcctive width of flange of prcstrcsscd bcam at the scctions of mid-span and support.It's shown that the width is rclatcd to the type of loads acting on structurcs and it's largcr duc to the cquivalcnt axis forccs than that duc to the combination of cquivalcnt transvcrse forccs and the cquivalcnt conccntratcd momcnt. It should be notcd that it's imposslble in some cascs that the pcak tcnsion strcss can be rcflcctcd with the cquivalcnt space frame mcthod instcad of the finite clcmcnt mcthod.
Keywords: finite clcmcnt mcthod; 3D analysis; cffcctive width; flangc; prcstrcsscd bcam-plate systcm