预应力梁板体系的空间分析及有效翼缘宽度

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大许多。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。

3D Analysis of the Bonded-prestressed Beam-plate-column System and the Effective Width of Flange of Prestressed Beam

Based on an engineering project,the finite element method is applied to the bonded\|prestressed beam\|plate\|column system.The stress distribution is achieved,which is closed to the result from the test.According to the static equivalence discipline,emphasis is on evaluating the effective width of flange of prestressed beam at the sections of mid\|span and support.It's shown that the width is related to the type of loads acting on structures and it's larger due to the equivalent axis forces than that due to the combination of equivalent transverse forces and the equivalent concentrated moment.It should be noted that it's impossible in some cases that the peak tension stress can be reflected with the equivalent space frame method instead of the finite element method.