异形刚构双肋形主梁偏载效应与剪力滞效应分析

Analysis for Eccentric Loading Effect & Shearlag Effect in Double-ribbed Main Girder of Shaped Rigid Frame

以天津冬旭路采用双肋形主梁的异形刚构桥为工程实例,利用ANSYS的三维实体单元仿真整个结构,并正确模拟了预应力钢束的作用,重点研究了双肋形主梁在活载作用下的偏载效应和宽桥面板的剪力滞效应。异形刚构对活载偏载效应较为显著,设计中应引起重视。分析结构表明:主跨偏载因数较小而边跨较大。剪力滞效应随着主跨跨径的增大而呈减弱趋势。

Taking the shaped rigid frame with double-ribbed main girder of Dongxu Rd.in Tianjin for example,this paper emulates the whole bridge structure by use of ANSYS 3D solid element,and precisely simulates the effect of post-tensioning tendons.The eccentric loading effect and shear-lag effect of the wide bridge deck under live load of the double-ribbed main girder are mainly studied in this paper.And the effect of shaped rigid frame to live & eccentric loading is obvious,which should need special attention from designers.The structure analysis indicates that less eccentric loading coefficient of main span and more of side span;less shear-lag effect and more main span.