槽型截面连续刚构桥受力特性分析  

Static Analysis for Continous Rigid Frame Bridge with Channel Section

作　　者：曾紫微 周增国[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《交通科技》2017年第6期20-22,共3页Transportation Science & Technology

摘　　要：通过数值计算研究了槽型梁在竖向及横向力作用下的受力特点。研究表明,在竖向左右对称荷载作用下,主梁产生竖向和横向位移,弯扭耦合效应明显。槽型梁截面下部面积大,中性轴靠下,主梁下缘应力通常比主梁上缘小,道床板宽度大时横向拉应力有时可能大于纵向拉应力。增加主梁肋板数量能提高主梁侧向抗弯刚度,增加肋板数量对主梁整体抗扭刚度的提升效果有限。In this paper,the numerical simulation is used to study the behavior of channel beam bridge under vertical and lateral loads.It shows that the vertical and horizontal displacement of main girder under left-right symmetrical vertical loads is obvious,and the bending and torsion coupling effect is obvious.The lower area of channel section is larger than the upper area,the neutral axis is on the lower position,so the longitudinal stress at the upper edge is usually greater than the stress at bottom area,and the slab transverse tensile stress may be greater than the longitudinal stress if the bridge is wide enough.Increasing the number of ribs can improve lateral bending stiffness of the main girder,but would barely improve the overall torsional stiffness of the main girder.

关 键 词：槽型梁 弯扭耦合 静力分析 

分 类 号：TU311.4[建筑科学—结构工程]