黄坤耀  楼文娟  孙炳楠    （浙江大学土木系  杭州 310027） 

    郭万萍    （杭州市建筑设计院 310001）

[提要]  结合一实际工程，建立了较精确的有限元模型，对有粘结预应力梁板柱体系进行空间分析，得出了结构的应力分布，并与现场实测结果进行了比较，两者吻合较好。按静力等效原理着重讨论了预应力梁支座截面和跨中截面有效翼缘宽度的合理取值，结果表明，预应力梁的有效翼缘宽度与结构受力的类型密切相关，在预应力等效轴向力作用下比等效横向力和等效集中弯矩作用下梁有效翼缘宽度人许多。另外还值得注意的是，在预应力等效荷载作用下，采用等代空间框架法分析将无法反映跨中截面板面的拉应力峰值。
[关键词]  有限元法  空间分析  有效翼缘宽度  预应力梁板体系

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