摘要
采用广义坐标法,建立畸变位移模式和几何方程,推导出畸变剪应力;基于混合变分原理,建立了一种新的畸变理论和梁段单元模型,该理论充分考虑了剪切变形的影响。基于新理论,指出了在单箱室箱梁不存在布莱特纯畸变,明确了畸变中心的定义,研究了畸变剪应力成分对剪切变形的影响及其影响程度。结果表明,对于常见的箱梁是可以忽略剪切变形的对畸变效应的影响。
Based on the generalized coordinate principle,displacement model and geometric equation are established,and distortion shear stress is derived.By using he mixed variational principle,a distortion analytical theory and finite beam segment method is presented which can sufficiently take account of shear deformation.Based on the new theory,it is proved that so-called Bredt＇s pure distortion does not exist in box girder with single cell and single box section,and the definition of distortion center is clarified.Studies on the effects of distortion shear stress on deformation indicate that it can be neglected for common box girder.
出处
《计算力学学报》
CAS
CSCD
北大核心
2013年第6期860-866,共7页
Chinese Journal of Computational Mechanics
基金
中央高校基本科研业务专项基金(SWJTU11BR010)资助项目
关键词
薄壁箱梁
畸变
混合变分原理
剪切变形
畸变中心
thin-walled box girder distortion mixed variational principle shear deformation distortion center
